A method for beneficiating high-sulfur gold-iron ore

Abstract

The present application provides a beneficiation method for high-sulfur gold-iron ore, which relates to the field of mining and metallurgy. The method comprises: performing gold roughing to obtain gold roughing concentrate and gold roughing tailings, performing gold concentrating on the gold roughing concentrate to obtain gold concentrating concentrate, and performing quality improvement and impurity reduction on the gold concentrating concentrate to obtain gold concentrate and the first sulfur concentrate; performing gold scavenging on the gold roughing tailings to obtain flotation tailings, and performing weak magnetic roughing on the flotation tailings to obtain weak magnetic roughing concentrate and weak magnetic roughing tailings; performing weak magnetic roughing concentrate regrinding and weak magnetic concentrating to obtain weak magnetic concentrating concentrate and weak magnetic concentrating tailings; combining weak magnetic roughing tailings and weak magnetic concentrating tailings to obtain tailings; performing demagnetization pretreatment on the weak magnetic concentrating concentrate and performing desulfurization roughing to obtain desulfurization roughing concentrate and desulfurization roughing tailings, performing desulfurization concentrating on the desulfurization roughing concentrate to obtain sulfur concentrate, and performing desulfurization scavenging on the desulfurization roughing tailings to obtain iron concentrate and the second sulfur concentrate. The method provided in the present application can realize the comprehensive recovery of gold, iron and sulfur to the greatest extent.

Description

Technical Field

[0001] The present application relates to the field of mining and metallurgy, and in particular to a method for beneficiating high-sulfur gold and iron ore. Background Art

[0002] High-sulfur gold-iron ore is a kind of gold, iron and sulfur co-existing ore. It is a difficult-to-process gold-iron ore. Gold is often wrapped in sulfide minerals in the form of fine gold particles. The sulfur-containing minerals are mainly pyrite, pyrrhotite and arsenopyrite. Magnetite is often closely associated with pyrite and pyrrhotite. For magnetic iron, weak magnetic separation process is often used, while for gold, flotation process is often used. Therefore, two process flows can be used: (1) flotation-first and then magnetic process, that is, flotation is used to recover gold and sulfur minerals first, and then weak magnetic separation is used to recover magnetite from flotation tailings; (2) magnetic-first and then flotation process, that is, weak magnetic separation is used to recover magnetite first, and then flotation is used to recover gold and sulfur minerals from weak magnetic tailings.

[0003] High-sulfur gold iron ore has a high pyrrhotite content. Gold is often wrapped in pyrite, pyrrhotite and gangue in the form of fine gold. In the flotation gold separation process, copper sulfate and other activators are used to activate gold and pyrrhotite at the same time. Xanthate collectors have a strong collection ability for pyrrhotite while recovering gold. Pyrrhotite closely embedded with gold will enter the gold concentrate, thereby affecting the gold grade in the gold concentrate. At the same time, since some magnetite is closely associated with pyrrhotite, pyrite and other sulfide minerals and has a fine embedded particle size, it is not easy to fully dissociate during the grinding process. Some magnetite will also enter the gold concentrate, affecting the gold grade in the gold concentrate. In addition, some pyrrhotite and gangue will enter the iron concentrate with magnetite during the magnetic separation process, affecting the iron grade of the iron concentrate. If the grinding is too fine, some gangue minerals are easy to muddy, thereby deteriorating the mineral processing environment.

[0004] High sulfur content will also lead to excessive sulfur in iron concentrate. The sulfur content of iron concentrate is one of the important criteria for evaluating the quality of concentrate. Different steel grades have different requirements for the sulfur content in their raw materials, which is generally less than 0.3%. Iron concentrate must be desulfurized to meet national standards before it can be used for steelmaking. Sulfur in high-sulfur magnetite mainly exists in the form of pyrrhotite. The technical difficulties of desulfurization of iron concentrate are: (1) Pyrrhotite has poor floatability. Due to the large changes in crystal structure composition, it has the characteristics of poor crystallization, easy to break, easy to muddy, easy to oxidize, and slow floating speed. It is a sulfide mineral that is difficult to float; (2) Magnetic agglomeration and encapsulation. After magnetic separation, there is a strong magnetic agglomeration effect between pyrrhotite and magnetite. When the mineral particle size is fine, the magnetic agglomeration phenomenon is particularly serious, which in turn affects the desulfurization effect. Therefore, the selection of a suitable desulfurization process and reagent system is the key to magnetite desulfurization.

[0005] In summary, high-sulfur gold-iron ore is a difficult-to-process gold-iron ore, which often has unfavorable factors such as complex composition, fine embedded particle size, and high pyrrhotite content, which makes it difficult to obtain high-grade gold concentrate, iron concentrate and qualified sulfur products, and the sulfur content in iron concentrate is prone to exceed the standard. How to achieve the comprehensive recovery of gold, iron and sulfur to the greatest extent and obtain high-quality concentrate products has become a technical problem that needs to be solved urgently. Summary of the invention

[0006] The purpose of this application is to provide a high-sulfur gold-iron ore beneficiation method to solve the above problems.

[0007] To achieve the above objectives, this application adopts the following technical solutions:

[0008] The present application provides a high-sulfur gold-iron ore beneficiation method, comprising:

[0009] The high-sulfur gold-iron ore is ground and pulped to obtain high-sulfur gold-iron ore pulp, the pH value is adjusted to weak acidity, and the high-sulfur gold-iron ore pulp is subjected to gold roughing selection to obtain gold roughing concentrate and gold roughing tailings; the gold roughing concentrate is subjected to gold concentration to obtain gold concentration concentrate and gold concentration middlings, the gold concentration concentrate is ground again to obtain gold concentration concentrate powder, and the gold concentration concentrate powder is subjected to magnetic separation to improve quality and reduce impurities to obtain gold concentrate and a first sulfur concentrate.

[0010] The gold roughing tailings are subjected to gold scavenging to obtain scavenging tailings and gold scavenging middlings, and the scavenging tailings are subjected to weak magnetic roughing to obtain weak magnetic roughing concentrate and weak magnetic roughing tailings; the weak magnetic roughing concentrate is ground again to obtain weak magnetic roughing concentrate powder, and the weak magnetic roughing concentrate powder is subjected to weak magnetic concentration to obtain weak magnetic concentration concentrate and weak magnetic concentration tailings; the weak magnetic concentration concentrate is subjected to demagnetization pretreatment and mixed with water to obtain demagnetization pretreated slurry, and the demagnetization pretreated slurry is subjected to desulfurization roughing to obtain desulfurization roughing concentrate and desulfurization roughing tailings, and the desulfurization roughing concentrate is subjected to desulfurization concentration to obtain a second sulfur concentrate and desulfurization concentrated middlings, and the first sulfur concentrate and the second sulfur concentrate are combined to obtain a sulfur concentrate.

[0011] The weak magnetic rougher tailings and the weak magnetic concentrate tailings are combined to obtain tailings, the desulfurized rougher tailings are mixed with water to obtain desulfurized scavenging tailings slurry, and after desulfurized scavenging, iron concentrate and desulfurized scavenging tailings are obtained.

[0012] Optionally, the high-sulfur gold iron ore is ground to a particle size of 55-80% of the high-sulfur gold iron ore not higher than 74 μm.

[0013] Optionally, during the gold roughing process, a pH adjuster, a first activator, a first collector, and a frother are added to the high-sulfur gold-iron ore slurry.

[0014] Optionally, the pH adjuster comprises at least one of sulfuric acid and oxalic acid. Optionally, the pH value is adjusted to 5-7.

[0015] Optionally, the first activator includes copper sulfate. Optionally, the first activator is used in an amount of 0-300 g per ton of the high-sulfur gold-iron ore.

[0016] Optionally, the first collector comprises at least one of a higher xanthate and di-n-butyl ammonium dithiophosphate. Optionally, the first collector is used in an amount of 100-300 g per ton of the high-sulfur gold iron ore.

[0017] Optionally, the foaming agent includes at least one of pine oil, methyl isobutyl carbinol and triethoxybutane. Optionally, the amount of the foaming agent is 10-50 g per ton of the high-sulfur gold iron ore.

[0018] Optionally, the particle size of 70-90% of the gold concentrate is not higher than 38 μm.

[0019] Optionally, the magnetic field intensity of the magnetic separation for improving quality and reducing impurities is 1500 Oe-3000 Oe.

[0020] Optionally, the magnetic field strength of the weak magnetic roughing is 1000 Oe-3000 Oe.

[0021] Optionally, the particle size of the weak magnetic rougher concentrate powder with a particle size of 70-90% is not higher than 38 μm.

[0022] Optionally, the magnetic field strength of the weak magnetic selection is 1000 Oe-2000 Oe.

[0023] Optionally, during the desulfurization roughing process, a first combination activator, a first combination collector and a second foaming agent are added to the ore pulp after the demagnetization pretreatment; during the desulfurization scavenging process, a second combination activator, a second combination collector and a third foaming agent are added to the desulfurization scavenging tailings slurry.

[0024] Optionally, the first combination activator and the second activator independently include oxalic acid, sulfuric acid, copper sulfate and sodium fluorosilicate; the mass ratio of their usage ratio is sulfuric acid: oxalic acid: copper sulfate: sodium fluorosilicate = (2-4): (2-4): (1-2): (4-8).

[0025] Optionally, the first combination collector and the second combination collector independently include butyl sodium xanthate, isopentyl sodium xanthate and BKG721, and the mass ratio of the usage ratio is butyl sodium xanthate: isopentyl sodium xanthate: BKG721 = (2-5): (2-5): 1.

[0026] Optionally, the second foaming agent and the third foaming agent independently include at least one of pine oil, methyl isobutyl carbinol and triethoxybutane.

[0027] Optionally, the total usage of the first combination activator is 10-150 g per ton of high-sulfur gold-iron ore.

[0028] Optionally, the total dosage of the first combined collector is 30-150 g per ton of high-sulfur gold-iron ore.

[0029] Optionally, the dosage of the second frother is 5-10 g per ton of high-sulfur gold-iron ore.

[0030] Optionally, the total usage of the second combination activator is 5-50 g per ton of high-sulfur gold-iron ore.

[0031] Optionally, the total dosage of the second combined collector is 10-50 g per ton of high-sulfur gold-iron ore.

[0032] Optionally, the dosage of the third frother is 0-10 g per ton of high-sulfur gold-iron ore.

[0033] Optionally, in the whole high-sulfur gold-iron ore beneficiation process, the gold roughing selection is carried out 1-2 times, the gold scavenging selection is carried out 1-2 times, the gold concentrating selection is carried out 2-3 times, the desulfurization roughing selection is carried out 1-4 times, the desulfurization scavenging selection is carried out 1-2 times, and the desulfurization concentrating is carried out 1-2 times.

[0034] Compared with the prior art, the beneficial effects of this application include:

[0035] The present application provides a beneficiation method for high-sulfur gold and iron ore. According to the beneficiation differences of various minerals in the ore, by adjusting the grinding method, the problems of low grade of gold concentrate, low iron grade of iron concentrate, excessive sulfur in iron concentrate, etc. are solved, and the impurity element sulfur is recovered to obtain a sulfur concentrate product, realizing efficient utilization of resources. First, the flotation process is used to flotate and recover gold to the greatest extent, and pyrite and most pyrrhotite are flotated and recovered to reduce the sulfur content in the iron concentrate in the subsequent magnetic separation process. At the same time, the pyrrhotite and magnetite mixed in the gold concentrate are re-grinded and magnetically separated to improve quality and reduce impurities. Since some gold minerals are closely symbiotic with pyrrhotite and magnetite, the three minerals are fully dissociated through re-grinding operations, and then pyrrhotite, magnetite and gold minerals are separated through magnetic separation operations, further improving the gold grade in the gold concentrate, and obtaining a gold concentrate and a first sulfur concentrate; then, the magnetite embedded in the magnetite is subjected to the magnetic separation operation. In order to take advantage of the uneven distribution of iron ore, the flotation tailings are subjected to stage grinding and stage magnetic separation. Weak magnetic roughing is carried out on the coarser particle size to ensure the iron recovery rate. Regrinding is carried out before weak magnetic concentration to further separate magnetite from other associated minerals. Weak magnetic concentration is carried out on the finer particle size to obtain high-grade iron concentrate. Finally, the iron concentrate is desulfurized by the method of "pre-demagnetization + combined activator + combined collector" to eliminate the magnetic agglomeration of pyrrhotite during weak magnetic separation, and then the flotation of sulfur is enhanced by the combined activator + combined collector to make the sulfur in the iron concentrate meet the standard, thus obtaining iron concentrate and the second sulfur concentrate.

[0036] The high-sulfur gold-iron ore beneficiation method provided in the present application can be used to process various high-sulfur gold-iron ores with uneven ore distribution and complex distribution. It has a wide range of applications and can realize the comprehensive recovery of gold, iron and sulfur to the greatest extent, thereby obtaining qualified gold concentrate, sulfur concentrate and high-grade iron concentrate products, thereby improving the economic benefits and comprehensive resource utilization rate of the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope of the present application.

[0038] Figure 1 A schematic diagram of the process flow for beneficiation of high-sulfur gold-iron ore provided in an embodiment. DETAILED DESCRIPTION

[0039] As used herein:

[0040] "Prepared from" is synonymous with "comprising." As used herein, the terms "comprising," "including," "having," "containing," or any other variation thereof, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises the listed elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.

[0041] The conjunction "consisting of excludes any unspecified element, step, or component. If used in a claim, this phrase renders the claim closed-ended so that it does not include materials other than those described, except for conventional impurities associated therewith. When the phrase "consisting of" appears in a clause of the body of a claim rather than immediately following the subject matter, it limits only the elements described in that clause; other elements are not excluded from the claim as a whole.

[0042] When an amount, concentration, or other value or parameter is expressed as a range, a preferred range, or a range defined by a series of upper preferred values ​​and lower preferred values, this should be understood as specifically disclosing all ranges formed by any pairing of any range upper limit or preferred value with any range lower limit or preferred value, regardless of whether the range is disclosed separately. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted as including ranges "1 to 4", "1 to 3", "1 to 2", "1 to 2 and 4 to 5", "1 to 3 and 5", etc. When a numerical range is described in this article, unless otherwise stated, the range is intended to include its end values ​​and all integers and fractions within the range.

[0043] In these examples, parts and percentages are by mass unless otherwise indicated.

[0044] "Mass parts" refers to the basic unit of measurement for expressing the mass ratio of multiple components. 1 part can represent any unit mass, such as 1g or 2.689g. If we say that the mass parts of component A are a parts and the mass parts of component B are b parts, it means the ratio of the mass of component A to the mass of component B is a:b. Alternatively, it means that the mass of component A is aK and the mass of component B is bK (K is an arbitrary number, indicating a multiple factor). It should not be misunderstood that, unlike the mass parts, the sum of the mass parts of all components is not limited to 100 parts.

[0045] "And / or" is used to indicate that one or both of the stated situations may occur, for example, A and / or B includes (A and B) and (A or B).

[0046] In order to better explain the technical solution provided by this application, before the embodiments, the technical solution is first described as a whole, as follows:

[0047] The present application provides a high-sulfur gold-iron ore beneficiation method, comprising:

[0048] The high-sulfur gold-iron ore is ground and pulped to obtain high-sulfur gold-iron ore pulp, the pH value is adjusted to weak acidity, and the high-sulfur gold-iron ore pulp is subjected to gold roughing selection to obtain gold roughing concentrate and gold roughing tailings; the gold roughing concentrate is subjected to gold concentration to obtain gold concentration concentrate and gold concentration middlings, the gold concentration concentrate is ground again to obtain gold concentration concentrate powder, and the gold concentration concentrate powder is subjected to magnetic separation to improve quality and reduce impurities to obtain gold concentrate and a first sulfur concentrate.

[0049] The gold roughing tailings are subjected to gold scavenging to obtain scavenging tailings and gold scavenging middlings, and the scavenging tailings are subjected to weak magnetic roughing to obtain weak magnetic roughing concentrate and weak magnetic roughing tailings; the weak magnetic roughing concentrate is ground again to obtain weak magnetic roughing concentrate powder, and the weak magnetic roughing concentrate powder is subjected to weak magnetic concentration to obtain weak magnetic concentration concentrate and weak magnetic concentration tailings; the weak magnetic concentration concentrate is subjected to demagnetization pretreatment and mixed with water to obtain demagnetization pretreated slurry, and the demagnetization pretreated slurry is subjected to desulfurization roughing to obtain desulfurization roughing concentrate and desulfurization roughing tailings, and the desulfurization roughing concentrate is subjected to desulfurization concentration to obtain a second sulfur concentrate and desulfurization concentrated middlings, and the first sulfur concentrate and the second sulfur concentrate are combined to obtain a sulfur concentrate.

[0050] The weak magnetic rougher tailings and the weak magnetic concentrate tailings are combined to obtain tailings, the desulfurized rougher tailings are mixed with water to obtain desulfurized scavenging tailings slurry, and the iron concentrate and desulfurized scavenging tailings are obtained after desulfurization scavenging. The present application adopts the method of "pre-demagnetization + combined activator + combined collector" to enhance the desulfurization effect of iron concentrate.

[0051] The high-sulfur gold-iron ore, calculated based on its own mass as 100%, has a sulfur content of 2.5-5.0%, an iron content of 20-30%, and a gold content of 0.5-2.0 g per ton of the high-sulfur gold-iron ore.

[0052] Optionally, the sulfur content of the high-sulfur gold-iron ore may be 2.5%, 3.0%, 3.5%, 4.0%, 4.5%, 5.0%, or any value between 2.5-5.0%; the iron content may be 20%, 22%, 24%, 26%, 28%, 30%, or any value between 20-30%; the gold content may be 0.5 g per ton of high-sulfur gold-iron ore, 1.0 g per ton of high-sulfur gold-iron ore, 1.5 g per ton of high-sulfur gold-iron ore, 2.0 g per ton of high-sulfur gold-iron ore, or any value between 1.5-2.0 g per ton of high-sulfur gold-iron ore.

[0053] In an optional embodiment, the high-sulfur gold iron ore is ground to a particle size of 55-80% and the particle size of the high-sulfur gold iron ore is not higher than 74 μm. By controlling the particle size of the high-sulfur gold iron ore, the contact area can be increased, thereby improving the reaction efficiency between mineral particles and the metal during ore dressing, thereby optimizing the separation effect, improving the recovery rate of ore dressing, reducing ore dressing losses, and ultimately improving the mineral taste to obtain a high-purity concentrate.

[0054] Optionally, the particle size may be 55%, 60%, 65%, 70%, 75%, 80%, or any value between 55% and 80%. The particle size of the high-sulfur gold iron ore after grinding may be any value between 0 and 75 μm.

[0055] In the process of performing the gold roughing:

[0056] In an optional embodiment, a pH adjuster, a first activator, a first collector, and a foaming agent are added to the high-sulfur gold iron ore slurry; the pH adjuster includes at least one of sulfuric acid and oxalic acid; the first activator includes copper sulfate; the first collector includes at least one of higher xanthate and di-n-butyl ammonium dithiophosphate; the foaming agent includes at least one of pine oil, methyl isobutyl carbinol and triethoxybutane.

[0057] In an optional embodiment, the pH value is adjusted in the range of 5-7.

[0058] Optionally, the pH value may be 5, 6, 7, or any value between 5-7.

[0059] In an optional embodiment, the dosage of the first activator is 20-300 g per ton of the high-sulfur gold-iron ore.

[0060] Optionally, the dosage of the first activator can be 20g per ton of the high-sulfur gold-iron ore, 50g per ton of the high-sulfur gold-iron ore, 100g per ton of the high-sulfur gold-iron ore, 150g per ton of the high-sulfur gold-iron ore, 200g per ton of the high-sulfur gold-iron ore, 250g per ton of the high-sulfur gold-iron ore, 300g per ton of the high-sulfur gold-iron ore, or any value between 0-300g per ton of the high-sulfur gold-iron ore.

[0061] In an optional embodiment, the dosage of the first collector is 100-300 g per ton of the high-sulfur gold-iron ore.

[0062] Optionally, the dosage of the first collector can be 100 g per ton of the high-sulfur gold-iron ore, 150 g per ton of the high-sulfur gold-iron ore, 200 g per ton of the high-sulfur gold-iron ore, 250 g per ton of the high-sulfur gold-iron ore, 300 g per ton of the high-sulfur gold-iron ore, or any value between 100-300 g per ton of the high-sulfur gold-iron ore.

[0063] In an optional embodiment, the dosage of the frother is 10-50 g per ton of the high-sulfur gold-iron ore.

[0064] Optionally, the dosage of the foaming agent can be 10g per ton of the high-sulfur gold-iron ore, 15g per ton of the high-sulfur gold-iron ore, 20g per ton of the high-sulfur gold-iron ore, 25g per ton of the high-sulfur gold-iron ore, 30g per ton of the high-sulfur gold-iron ore, 35g per ton of the high-sulfur gold-iron ore, 40g per ton of the high-sulfur gold-iron ore, 45g per ton of the high-sulfur gold-iron ore, 50g per ton of the high-sulfur gold-iron ore, or any value between 10-50g per ton of the high-sulfur gold-iron ore.

[0065] During the gold selection process:

[0066] In an optional embodiment, the particle size of 70-90% of the gold concentrate powder is not higher than 38 μm.

[0067] Optionally, the particle size may be 70%, 75%, 80%, 85%, 90%, or any value between 70% and 90%. The particle size of the gold concentrate powder may be any value between 0 and 38 μm.

[0068] In an optional embodiment, the magnetic field strength of the magnetic separation for improving quality and reducing impurities is 1500-3000 Oe.

[0069] Optionally, the magnetic field intensity for magnetic separation to improve quality and reduce impurities can be 1500 Oe, 1600 Oe, 1700 Oe, 1800 Oe, 1900 Oe, 2000 Oe, 2100 Oe, 2200 Oe, 2300 Oe, 2400 Oe, 2500 Oe, 2600 Oe, 2700 Oe, 2800 Oe, 2900 Oe, 3000 Oe, or any value between 1500-3000 Oe.

[0070] In the process of weak magnetic roughing and weak magnetic concentrating:

[0071] In an optional embodiment, the magnetic field strength of the weak magnetic roughing is 1000 Oe-3000 Oe.

[0072] In an optional embodiment, the particle size of 70-90% of the weak magnetic rougher concentrate powder in the weak magnetic rougher concentrate powder is not higher than 38 μm.

[0073] Optionally, the particle size may be 70%, 75%, 80%, 85%, 90%, or any value between 70% and 90%. The particle size of the weak magnetic roughing concentrate powder may be any value between 0 and 38 microns.

[0074] Optionally, the magnetic field strength of the weak magnetic roughing selection can be 1000 Oe, 1200 Oe, 1400 Oe, 1600 Oe, 1800 Oe, 2000 Oe, 2200 Oe, 2400 Oe, 2600 Oe, 2800 Oe, 3000 Oe, or any value between 1000-3000 Oe.

[0075] In an optional embodiment, the magnetic field strength of the weak magnetic concentration is 1000 Oe-2000 Oe.

[0076] Optionally, the magnetic field strength of the weak magnetic selection can be 1000 Oe, 1100 Oe, 1200 Oe, 1300 Oe, 1400 Oe, 1500 Oe, 1600 Oe, 1700 Oe, 1800 Oe, 1900 Oe, 2000 Oe, or any value between 1000-2000 Oe.

[0077] During the desulfurization roughing process:

[0078] In an optional embodiment, a first combination activator, a first combination collector and a second foaming agent are added to the pulp after the demagnetization pretreatment; during the desulfurization scavenging process, a second combination activator, a second combination collector and a third foaming agent are added to the desulfurization scavenging tailing pulp. The first combination activator and the second combination activator independently include oxalic acid, sulfuric acid, copper sulfate and sodium fluorosilicate; the mass ratio of their usage ratio is sulfuric acid: oxalic acid: copper sulfate: sodium fluorosilicate = (2-4): (2-4): (1-2): (4-8). The first combination collector and the second combination collector independently include butyl sodium xanthate, isopentyl sodium xanthate and BKG721, and the mass ratio of their usage ratio is butyl sodium xanthate: isopentyl sodium xanthate: BKG721 = (2-5): (2-5): 1. The second foaming agent and the third foaming agent independently include at least one of pine oil, methyl isobutyl carbinol and triethoxybutane.

[0079] In an optional embodiment, the total usage of the second combination activator is 10-150 g per ton of high-sulfur gold-iron ore.

[0080] Optionally, the total dosage of the first combination activator can be 10 g per ton of high-sulfur gold-iron ore, 25 g per ton of high-sulfur gold-iron ore, 50 g per ton of high-sulfur gold-iron ore, 75 g per ton of high-sulfur gold-iron ore, 100 g per ton of high-sulfur gold-iron ore, 125 g per ton of high-sulfur gold-iron ore, 150 g per ton of high-sulfur gold-iron ore, or any value between 0-150 g per ton of high-sulfur gold-iron ore.

[0081] In an optional embodiment, the total dosage of the first combined collector is 30-150 g per ton of high-sulfur gold-iron ore.

[0082] Optionally, the total dosage of the first combination collector can be 30 g per ton of high-sulfur gold-iron ore, 50 g per ton of high-sulfur gold-iron ore, 70 g per ton of high-sulfur gold-iron ore, 90 g per ton of high-sulfur gold-iron ore, 110 g per ton of high-sulfur gold-iron ore, 130 g per ton of high-sulfur gold-iron ore, 150 g per ton of high-sulfur gold-iron ore, or any value between 30-150 g per ton of high-sulfur gold-iron ore.

[0083] In an optional embodiment, the dosage of the second frother in the weak magnetic roughing process is 5-10 g per ton of high-sulfur gold-iron ore.

[0084] Optionally, the dosage of the second foaming agent in the weak magnetic roughing process can be 5 g per ton of high-sulfur gold-iron ore, 6 g per ton of high-sulfur gold-iron ore, 7 g per ton of high-sulfur gold-iron ore, 8 g per ton of high-sulfur gold-iron ore, 9 g per ton of high-sulfur gold-iron ore, 10 g per ton of high-sulfur gold-iron ore, or any value between 5-10 g per ton of high-sulfur gold-iron ore.

[0085] In the desulfurization sweep process:

[0086] In an optional embodiment, the second combination activator, the second combination collector and the third foaming agent are added to the desulfurized scavenging tailings slurry. The second combination activator includes sulfuric acid, oxalic acid, copper sulfate, sodium fluorosilicate, and the mass ratio of the dosage ratio is sulfuric acid: oxalic acid: copper sulfate: sodium fluorosilicate = (2-4): (2-4): (1-2): (4-8); the second combination collector includes butyl sodium xanthate, isopentyl sodium xanthate, BKG721, and the mass ratio of the dosage ratio is butyl sodium xanthate: isopentyl sodium xanthate: BKG721 = (2-5): (2-5): 1; the third foaming agent independently includes at least one of pine oil, methyl isobutyl carbinol and triethoxybutane.

[0087] In an optional embodiment, the total usage of the second combination activator is 5-50 g per ton of high-sulfur gold-iron ore.

[0088] Optionally, the total dosage of the second combination activator can be 5 g per ton of high-sulfur gold-iron ore, 10 g per ton of high-sulfur gold-iron ore, 20 g per ton of high-sulfur gold-iron ore, 30 g per ton of high-sulfur gold-iron ore, 40 g per ton of high-sulfur gold-iron ore, 50 g per ton of high-sulfur gold-iron ore, or any value between 0-50 g per ton of high-sulfur gold-iron ore.

[0089] In an optional embodiment, the total dosage of the second combined collector is 10-50 g per ton of high-sulfur gold-iron ore.

[0090] Optionally, the total dosage of the second combination collector can be 10 g per ton of high-sulfur gold-iron ore, 20 g per ton of high-sulfur gold-iron ore, 30 g per ton of high-sulfur gold-iron ore, 40 g per ton of high-sulfur gold-iron ore, 50 g per ton of high-sulfur gold-iron ore, or any value between 10-50 g per ton of high-sulfur gold-iron ore.

[0091] In an optional embodiment, the dosage of the third foaming agent during desulfurization sweeping is 0-10 g per ton of high-sulfur gold and iron ore.

[0092] Optionally, the dosage of the third foaming agent during the desulfurization sweeping can be 0 g per ton of high-sulfur gold-iron ore, 1 g per ton of high-sulfur gold-iron ore, 2 g per ton of high-sulfur gold-iron ore, 3 g per ton of high-sulfur gold-iron ore, 4 g per ton of high-sulfur gold-iron ore, 5 g per ton of high-sulfur gold-iron ore, 6 g per ton of high-sulfur gold-iron ore, 7 g per ton of high-sulfur gold-iron ore, 8 g per ton of high-sulfur gold-iron ore, 9 g per ton of high-sulfur gold-iron ore, 10 g per ton of high-sulfur gold-iron ore, or any value between 0-10 g per ton of high-sulfur gold-iron ore.

[0093] In the whole process of high-sulfur gold-iron ore beneficiation:

[0094] The gold roughing is carried out 1-2 times, the gold scavenging is carried out 1-2 times, the gold concentrating is carried out 2-3 times, the desulfurization roughing is carried out 1-3 times, the desulfurization scavenging is carried out 1-2 times, and the desulfurization concentrating is carried out 1-2 times.

[0095] It can be understood that the overall idea of ​​the technical solution provided in the present application can be summarized as follows: gold roughing is carried out to obtain gold roughing concentrate and gold roughing tailings, the gold roughing concentrate is subjected to gold concentration to obtain gold concentration concentrate, the gold concentration concentrate is subjected to quality improvement and impurity reduction to obtain gold concentrate and a first sulfur concentrate; the gold roughing tailings are subjected to gold scavenging to obtain flotation tailings, the flotation tailings are subjected to weak magnetic roughing to obtain weak magnetic roughing concentrate and weak magnetic roughing tailings; the weak magnetic roughing concentrate is regrinded and then subjected to weak magnetic concentration to obtain weak magnetic concentration concentrate and weak magnetic concentration tailings; the weak magnetic roughing tailings and the weak magnetic concentration tailings are combined to obtain tailings; the weak magnetic concentration concentrate is subjected to demagnetization pretreatment and then subjected to desulfurization roughing to obtain desulfurization roughing concentrate and desulfurization roughing tailings, the desulfurization roughing concentrate is subjected to desulfurization concentration to obtain sulfur concentrate, and the desulfurization roughing tailings are subjected to desulfurization scavenging to obtain iron concentrate and a second sulfur concentrate; the first sulfur concentrate and the second sulfur concentrate are combined to obtain a total sulfur concentrate.

[0096] The embodiments of the present application will be described in detail below in conjunction with specific examples, but it will be appreciated by those skilled in the art that the following examples are only used to illustrate the present application and should not be considered as limiting the scope of the present application. If specific conditions are not specified in the examples, they are carried out according to normal conditions or the conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0097] It should be noted that the drug information used in each embodiment of the present application is as follows:

[0098] Sodium amyl xanthate: that is, high-grade sodium xanthate, produced by Tieling Ore Dressing Reagent Co., Ltd.

[0099] Butyl sodium xanthate: that is, high-grade sodium xanthate, produced by Tieling Ore Dressing Reagent Co., Ltd.

[0100] Pine oil, the manufacturer is Tieling Ore Dressing Reagent Co., Ltd.

[0101] Example 1

[0102] This embodiment provides a method for beneficiating high-sulfur gold-iron ore. The beneficiation process is as follows: Figure 1 As shown, the details are as follows:

[0103] The high-sulfur gold-iron ore used in this embodiment contains 1.4 g of gold per ton of the high-sulfur gold-iron ore. Calculated based on its own mass as 100%, it contains 26.10% iron and 2.85% sulfur.

[0104] (1) The high-sulfur gold iron ore is ground, and the particle size with a grinding fineness of 74 μm or less accounts for 60%, and then mixed with water to obtain high-sulfur gold iron ore slurry.

[0105] (2) The slurry of the high-sulfur gold-iron ore in step (1) is placed in a flotation machine for two roughing selections, wherein 1000 g of sulfuric acid per ton of the high-sulfur gold-iron ore is added, stirred for 1 minute, and the pH value is adjusted to 6.5; wherein, during the first roughing selection, 100 g of butyl sodium xanthate per ton of the high-sulfur gold-iron ore and 8 g of pine oil per ton of the high-sulfur gold-iron ore are added, stirred for 2 minutes, and aerated flotation is performed for 4 minutes; during the second flotation selection, 50 g of butyl sodium xanthate per ton of the high-sulfur gold-iron ore and 4 g of pine oil per ton of the high-sulfur gold-iron ore are added, stirred for 2 minutes, and aerated flotation is performed for 4 minutes; after two roughing selections, a gold roughing concentrate and a gold roughing tailings are obtained.

[0106] (3) The gold rougher concentrate described in step (2) is placed in a flotation machine for two rounds of concentration. The first aeration flotation is performed for 4 minutes, and the second aeration flotation is performed for 3 minutes. The gold concentrate is obtained, and the middlings are returned in sequence.

[0107] (4) The gold concentrate described in step (3) is regrinded, and the regrinding fineness is 80% below 38 μm, and then magnetic separation is performed to improve quality and reduce impurities, and the magnetic field intensity is 2000 Oe to obtain gold concentrate and first sulfur concentrate.

[0108] (5) The gold roughing tailings described in step (2) are subjected to a scavenging operation. 25 g of butyl sodium xanthate per ton of high-sulfur gold iron ore and 4 g of pine oil per ton of high-sulfur gold iron ore are added to the scavenging operation. The ore is stirred for 2 minutes and aerated for flotation for 4 minutes to obtain gold flotation tailings. The middling ore is then returned in sequence.

[0109] (6) The gold flotation tailings described in step (5) are subjected to weak magnetic roughing with a magnetic field strength of 2000 Oe to obtain weak magnetic roughing concentrate and weak magnetic roughing tailings.

[0110] (7) The weak magnetic roughing concentrate described in step (6) is regrinded, and the particle size with a grinding fineness of 38 μm or less accounts for 75%, and then weak magnetic concentration is performed with a magnetic field strength of 1400 Oe to obtain a weak magnetic concentration concentrate and a weak magnetic concentration tailings; the weak magnetic roughing tailings described in step (6) and the weak magnetic concentration tailings are combined to obtain the final tailings.

[0111] (8) Demagnetizing the weak magnetic concentrated ore described in step (7) to obtain a demagnetized product.

[0112] (9) The demagnetized product of step (8) is placed in a flotation machine for three desulfurization roughing. The three roughing combination activators have the same dosage ratio, which is sulfuric acid: oxalic acid: copper sulfate: sodium fluorosilicate = 2: 2: 1: 4 by mass, and the three roughing combination collectors have the same dosage ratio, which is butyl sodium xanthate: isopentyl sodium xanthate: BKG721 = 2: 2: 1 by mass. Among them, in the first desulfurization roughing, 50g of combined activator is added per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and then 50g of combined collector is added per ton of high-sulfur gold-iron ore and 4g of pine oil per ton of high-sulfur gold-iron ore are added, stirred for 2 minutes, and aerated flotation is performed for 3 minutes; in the second desulfurization roughing process, 25g of combined activator is added per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and then 25g of combined collector is added per ton of high-sulfur gold-iron ore and 4g of pine oil per ton of high-sulfur gold-iron ore are added, stirred for 2 minutes, and aerated flotation is performed for 3 minutes; iron concentrate and desulfurization roughing concentrate are obtained. In the third desulfurization roughing process, 15g of combined activator is added per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and then 15g of combined collector is added per ton of high-sulfur gold-iron ore and 2g of pine oil per ton of high-sulfur gold-iron ore are added, stirred for 2 minutes, and aerated flotation is performed for 3 minutes; iron concentrate and desulfurization roughing concentrate are obtained.

[0113] Among them, during the first desulfurization roughing process, a total amount of 50g of combined activator was added per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and then a total amount of combined collector was added per ton of high-sulfur gold-iron ore and 5g of pine oil per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and aerated flotation was performed for 3 minutes to obtain iron concentrate and desulfurization roughing concentrate.

[0114] (10) The desulfurized rougher concentrate in step (9) is placed in a flotation machine for two desulfurization and concentration operations. In the first desulfurization and concentration process, aeration flotation is performed for 3 minutes to obtain the second sulfur concentrate middlings for sequential return operation; in the second desulfurization and concentration process, aeration flotation is performed for 2 minutes to obtain the second sulfur concentrate middlings for sequential return operation; the first sulfur concentrate in step (4) and the second sulfur concentrate are combined to obtain the final sulfur concentrate.

[0115] Example 2

[0116] This embodiment provides a method for beneficiating high-sulfur gold-iron ore, which is as follows:

[0117] The high-sulfur gold-iron ore used in this embodiment contains 1.6 g of gold per ton of the high-sulfur gold-iron ore. Calculated based on its own mass as 100%, it contains 25.70% iron and 2.95% sulfur.

[0118] (1) The high-sulfur gold iron ore is ground, and the particle size with a grinding fineness of 74 μm or less accounts for 65%. After mixing with water, the high-sulfur gold iron ore slurry is obtained.

[0119] (2) The slurry of the high-sulfur gold-iron ore in step (1) is placed in a flotation machine for two roughing selections, wherein 1500 g of sulfuric acid is added per ton of the high-sulfur gold-iron ore, stirred for 1 minute, and the pH value is adjusted to 6.0; wherein, during the first roughing selection, 120 g of butyl sodium xanthate per ton of the high-sulfur gold-iron ore and 8 g of pine oil per ton of the high-sulfur gold-iron ore are added, stirred for 2 minutes, and aerated flotation is performed for 5 minutes; during the second flotation selection, 60 g of butyl sodium xanthate per ton of the high-sulfur gold-iron ore and 4 g of pine oil per ton of the high-sulfur gold-iron ore are added, stirred for 2 minutes, and aerated flotation is performed for 4 minutes; after two roughing selections, a gold roughing concentrate and a gold roughing tailings are obtained.

[0120] (3) The gold rougher concentrate described in step (2) is placed in a flotation machine for two rounds of concentration. The first aeration flotation is performed for 4 minutes, and the second aeration flotation is performed for 3 minutes. The gold concentrate is obtained, and the middlings are returned in sequence.

[0121] (4) The gold concentrate described in step (3) is regrinded, and the regrinding fineness is below 38 μm, accounting for 83%, and then subjected to magnetic separation to improve quality and reduce impurities, and the magnetic field intensity is 1500 Oe, to obtain gold concentrate and first sulfur concentrate.

[0122] (5) The gold roughing tailings in step (2) are subjected to two scavenging operations. In the first scavenging operation, 30 g of sodium butyl xanthate per ton of high-sulfur gold iron ore and 4 g of pine oil per ton of high-sulfur gold iron ore are added, stirred for 2 minutes, and aerated flotation is performed for 4 minutes; in the second scavenging operation, 15 g of sodium butyl xanthate per ton of high-sulfur gold iron ore is added, stirred for 2 minutes, and aerated flotation is performed for 3 minutes; gold flotation tailings are obtained, and the middlings are returned in sequence.

[0123] (6) The gold flotation tailings described in step (5) are subjected to weak magnetic roughing with a magnetic field strength of 1500 Oe to obtain weak magnetic roughing concentrate and weak magnetic roughing tailings.

[0124] (7) The weak magnetic roughing concentrate described in step (6) is regrinded, and the particle size with a grinding fineness of 38 μm or less accounts for 80%, and then weak magnetic concentration is performed with a magnetic field strength of 1600 Oe to obtain a weak magnetic concentration concentrate and a weak magnetic concentration tailings; the weak magnetic roughing tailings described in step (6) and the weak magnetic concentration tailings are combined to obtain the final tailings.

[0125] (8) Demagnetizing the weak magnetic concentrated ore described in step (7) to obtain a demagnetized product.

[0126] (9) The demagnetized product of step (8) is placed in a flotation machine for two desulfurization roughing. The two roughing combination activators have the same dosage ratio, which is sulfuric acid: oxalic acid: copper sulfate: sodium fluorosilicate = 2: 2: 1: 5 by mass. The two roughing combination collectors have the same dosage ratio, which is butyl sodium xanthate: isopentyl sodium xanthate: BKG721 = 2: 2: 2 by mass. Among them, in the first desulfurization roughing, 50g of the combined activator was added per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and then 50g of the combined collector was added per ton of high-sulfur gold-iron ore and 4g of pine oil were added per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and aerated flotation was performed for 3 minutes; in the second desulfurization roughing process, 25g of the combined activator was added per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and then 25g of the combined collector was added per ton of high-sulfur gold-iron ore and 4g of pine oil were added per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and aerated flotation was performed for 3 minutes; iron concentrate and desulfurization roughing concentrate were obtained.

[0127] (10) The desulfurized rougher concentrate in step (9) is placed in a flotation machine for two desulfurization and concentration operations. In the first desulfurization and concentration process, aeration flotation is performed for 3 minutes to obtain the second sulfur concentrate middlings for sequential return operation; in the second desulfurization and concentration process, aeration flotation is performed for 2 minutes to obtain the second sulfur concentrate middlings for sequential return operation; the first sulfur concentrate in step (4) and the second sulfur concentrate are combined to obtain the final sulfur concentrate.

[0128] Example 3

[0129] This embodiment provides a method for beneficiating high-sulfur gold-iron ore, which is as follows:

[0130] The high-sulfur gold-iron ore used in this embodiment contains 2.0 g of gold per ton of the high-sulfur gold-iron ore. Calculated based on its own mass as 100%, it contains 26.44% iron and 3.50% sulfur.

[0131] (1) The high-sulfur gold iron ore is ground, and the particle size with a grinding fineness of less than 74 μm accounts for 70%, and then mixed with water to obtain high-sulfur gold iron ore slurry.

[0132] (2) The slurry of the high-sulfur gold-iron ore in step (1) is placed in a flotation machine for two roughing selections, wherein 1000 g of sulfuric acid is added per ton of the high-sulfur gold-iron ore, stirred for 1 minute, and the pH value is adjusted to 6.5; wherein, during the first roughing selection, 100 g of copper sulfate is added per ton of the high-sulfur gold-iron ore, stirred for 2 minutes, 150 g of butyl sodium xanthate is added per ton of the high-sulfur gold-iron ore and 12 g of pine oil are added per ton of the high-sulfur gold-iron ore, stirred for 2 minutes, and aerated flotation is performed for 6 minutes; during the second flotation selection, 50 g of copper sulfate is added per ton of the high-sulfur gold-iron ore, stirred for 2 minutes, 80 g of butyl sodium xanthate is added per ton of the high-sulfur gold-iron ore and 4 g of pine oil are added per ton of the high-sulfur gold-iron ore, stirred for 2 minutes, and aerated flotation is performed for 4 minutes; after two roughing selections, a gold roughing concentrate and a gold roughing tailing are obtained.

[0133] (3) The gold rougher concentrate described in step (2) is placed in a flotation machine for two rounds of concentration. The first aeration flotation is performed for 4 minutes, and the second aeration flotation is performed for 3 minutes. The gold concentrate is obtained, and the middlings are returned in sequence.

[0134] (4) The gold concentrate described in step (3) is regrinded, and the regrinding fineness is 87% below 38 μm, and then magnetic separation is performed to improve quality and reduce impurities, and the magnetic field intensity is 1800 Oe to obtain gold concentrate and first sulfur concentrate.

[0135] (5) The gold roughing tailings in step (2) are subjected to two scavengings. In the first scavenging, 25 g of copper sulfate is added per ton of high-sulfur gold iron ore, stirred for 2 minutes, 40 g of butyl sodium xanthate is added per ton of high-sulfur gold iron ore, 4 g of frother is added per ton of high-sulfur gold iron ore, stirred for 2 minutes, and aerated flotation is performed for 4 minutes; in the second scavenging, 10 g of copper sulfate is added per ton of high-sulfur gold iron ore, stirred for 2 minutes, 20 g of butyl sodium xanthate is added per ton of high-sulfur gold iron ore, stirred for 2 minutes, and aerated flotation is performed for 4 minutes; gold flotation tailings are obtained, and the middling ore is sequentially returned.

[0136] (6) The gold flotation tailings described in step (5) are subjected to weak magnetic roughing with a magnetic field strength of 1800 Oe to obtain weak magnetic roughing concentrate and weak magnetic roughing tailings.

[0137] (7) The weak magnetic roughing concentrate described in step (6) is regrinded, and the particle size with a grinding fineness of 38 μm or less accounts for 85%, and then weak magnetic concentration is performed with a magnetic field strength of 1200 Oe to obtain a weak magnetic concentration concentrate and a weak magnetic concentration tailings; the weak magnetic roughing tailings described in step (6) and the weak magnetic concentration tailings are combined to obtain the final tailings.

[0138] (8) Demagnetizing the weak magnetic concentrated ore described in step (7) to obtain a demagnetized product.

[0139] (9) The demagnetized product of step (8) is placed in a flotation machine for 4 desulfurization roughing. The activator combination for the 4 roughing is consistent in the mass ratio of sulfuric acid: oxalic acid: copper sulfate: sodium fluorosilicate = 3: 3: 2: 5, and the collector combination for the 3 roughing is consistent in the mass ratio of butyl sodium xanthate: isopentyl sodium xanthate: BKG721 = 2: 3: 1. Among them, in the first desulfurization roughing, 100 g of the combined activator was added per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and then 100 g of the combined collector was added per ton of high-sulfur gold-iron ore and 4 g of pine oil were added per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and aerated flotation was performed for 3 minutes; in the second desulfurization roughing process, 50 g of the combined activator was added per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and then 50 g of the combined collector was added per ton of high-sulfur gold-iron ore and 4 g of pine oil were added per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and aerated flotation was performed for 3 minutes; iron concentrate and desulfurization roughing concentrate were obtained. During the third desulfurization roughing process, 25 g of the combined activator was added per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and then 25 g of the combined collector was added per ton of high-sulfur gold-iron ore and 2 g of pine oil were added per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and aerated flotation was performed for 3 minutes; during the fourth desulfurization roughing process, 15 g of the combined activator was added per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and then 15 g of the combined collector was added per ton of high-sulfur gold-iron ore and 2 g of pine oil were added per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and aerated flotation was performed for 3 minutes; iron concentrate and desulfurization roughing concentrate were obtained.

[0140] (10) The desulfurized rougher concentrate described in step (9) is placed in a flotation machine for two desulfurization and concentration operations. During the first desulfurization and concentration operation, aeration flotation is performed for 4 minutes to obtain the second sulfur concentrate middlings for sequential return operation; during the second desulfurization and concentration operation, aeration flotation is performed for 3 minutes to obtain the second sulfur concentrate middlings for sequential return operation; the first sulfur concentrate described in step (4) and the second sulfur concentrate are combined to obtain the final sulfur concentrate.

[0141] Comparative Example 1

[0142] This comparative example provides a beneficiation method for high-sulfur gold iron ore, which is as follows:

[0143] (1) The high-sulfur gold iron ore is ground, and the particle size with a grinding fineness of 74 μm or less accounts for 60%, and then mixed with water to obtain high-sulfur gold iron ore slurry.

[0144] (2) The slurry of the high-sulfur gold-iron ore in step (1) is placed in a flotation machine for two roughing selections, wherein 1000 g of sulfuric acid per ton of the high-sulfur gold-iron ore is added, stirred for 1 minute, and the pH value is adjusted to 6.5; wherein, during the first roughing selection, 100 g of butyl sodium xanthate per ton of the high-sulfur gold-iron ore and 8 g of pine oil per ton of the high-sulfur gold-iron ore are added, stirred for 2 minutes, and aerated flotation is performed for 4 minutes; during the second flotation selection, 50 g of butyl sodium xanthate per ton of the high-sulfur gold-iron ore and 4 g of pine oil per ton of the high-sulfur gold-iron ore are added, stirred for 2 minutes, and aerated flotation is performed for 4 minutes; after two roughing selections, a gold roughing concentrate and a gold roughing tailings are obtained.

[0145] (3) The gold rougher concentrate described in step (2) is placed in a flotation machine for two rounds of concentration. The first aeration flotation is performed for 4 minutes, and the second aeration flotation is performed for 3 minutes. The gold concentrate is obtained, and the middlings are returned in sequence.

[0146] (4) The gold roughing tailings described in step (2) are subjected to a scavenging operation. 25 g of butyl sodium xanthate per ton of high-sulfur gold iron ore and 4 g of pine oil per ton of high-sulfur gold iron ore are added to the scavenging operation. The ore is stirred for 2 minutes and aerated for flotation for 4 minutes to obtain gold flotation tailings. The middling ore is then returned in sequence.

[0147] (5) The gold flotation tailings described in step (4) are subjected to weak magnetic roughing with a magnetic field strength of 2000 Oe to obtain weak magnetic roughing concentrate and weak magnetic roughing tailings.

[0148] (6) The weak magnetic roughing concentrate described in step (5) is regrinded, and the particle size with a grinding fineness of 38 μm or less accounts for 75%, and then weak magnetic concentration is performed with a magnetic field strength of 1400 Oe to obtain a weak magnetic concentration concentrate and a weak magnetic concentration tailings; the weak magnetic roughing tailings described in step (6) and the weak magnetic concentration tailings are combined to obtain the final tailings.

[0149] (7) Demagnetizing the weakly magnetic concentrated ore described in step (6) to obtain a demagnetized product.

[0150] (8) The demagnetized product of step (7) is placed in a flotation machine for three desulfurization roughing. The three roughing combination activators have the same dosage ratio, which is sulfuric acid: oxalic acid: copper sulfate: sodium fluorosilicate = 2: 2: 1: 4 by mass, and the three roughing combination collectors have the same dosage ratio, which is butyl sodium xanthate: isopentyl sodium xanthate: BKG721 = 2: 2: 1 by mass. Among them, in the first desulfurization roughing, 50g of combined activator is added per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and then 50g of combined collector is added per ton of high-sulfur gold-iron ore and 4g of pine oil per ton of high-sulfur gold-iron ore are added, stirred for 2 minutes, and aerated flotation is performed for 3 minutes; in the second desulfurization roughing process, 25g of combined activator is added per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and then 25g of combined collector is added per ton of high-sulfur gold-iron ore and 4g of pine oil per ton of high-sulfur gold-iron ore are added, stirred for 2 minutes, and aerated flotation is performed for 3 minutes; iron concentrate and desulfurization roughing concentrate are obtained. In the third desulfurization roughing process, 15g of combined activator is added per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and then 15g of combined collector is added per ton of high-sulfur gold-iron ore and 2g of pine oil per ton of high-sulfur gold-iron ore are added, stirred for 2 minutes, and aerated flotation is performed for 3 minutes; iron concentrate and desulfurization roughing concentrate are obtained.

[0151] Among them, during the first desulfurization roughing process, a total amount of 50g of combined activator was added per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and then a total amount of combined collector was added per ton of high-sulfur gold-iron ore and 5g of pine oil per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and aerated flotation was performed for 3 minutes to obtain iron concentrate and desulfurization roughing concentrate.

[0152] (9) The desulfurized rougher concentrate in step (8) is placed in a flotation machine for two desulfurization and concentration operations. During the first desulfurization and concentration operation, aeration flotation is performed for 3 minutes to obtain the second sulfur concentrate middlings for sequential return operation; during the second desulfurization and concentration operation, aeration flotation is performed for 2 minutes to obtain the second sulfur concentrate middlings for sequential return operation.

[0153] This comparative example refers to the ore dressing method described in Example 1, and the only difference from Example 1 is that the gold concentrate in step (4) is not subjected to regrinding and magnetic separation to improve quality and reduce impurities.

[0154] Example 1 and Comparative Example 1 were carried out under the condition of the same feed properties. The test indicators of Example 1 and Comparative Example 1 are shown in Table 1.

[0155] Table 1 Test indicators of Example 1 and Comparative Example 1

[0156]

[0157] According to Table 1, it can be seen that in Comparative Example 1, no regrinding-magnetic separation is performed to improve quality and reduce impurities. The gold grade in the gold concentrate is reduced from 31.92g per ton of high-sulfur gold-iron ore to 18.82g per ton of high-sulfur gold-iron ore, and the gold grade in the gold concentrate is reduced by 5.7g per ton of high-sulfur gold-iron ore. The grade of the gold concentrate obtained in Comparative Example 1 is significantly reduced, and cannot meet the national standard for the eighth grade of gold concentrate (Au grade>30g per ton of high-sulfur gold-iron ore), which in turn affects the pricing and sales of the gold concentrate.

[0158] Comparative Example 2

[0159] This comparative example provides a beneficiation method for high-sulfur gold iron ore, which is as follows:

[0160] (1) The high-sulfur gold iron ore is ground, and the particle size with a grinding fineness of 74 μm or less accounts for 65%. After mixing with water, the high-sulfur gold iron ore slurry is obtained.

[0161] (2) The slurry of the high-sulfur gold-iron ore in step (1) is placed in a flotation machine for two roughing selections, wherein 1500 g of sulfuric acid is added per ton of the high-sulfur gold-iron ore, stirred for 1 minute, and the pH value is adjusted to 6.0; wherein, during the first roughing selection, 120 g of butyl sodium xanthate per ton of the high-sulfur gold-iron ore and 8 g of pine oil per ton of the high-sulfur gold-iron ore are added, stirred for 2 minutes, and aerated flotation is performed for 5 minutes; during the second flotation selection, 60 g of butyl sodium xanthate per ton of the high-sulfur gold-iron ore and 4 g of pine oil per ton of the high-sulfur gold-iron ore are added, stirred for 2 minutes, and aerated flotation is performed for 4 minutes; after two roughing selections, a gold roughing concentrate and a gold roughing tailings are obtained.

[0162] (3) The gold rougher concentrate described in step (2) is placed in a flotation machine for two rounds of concentration. The first aeration flotation is performed for 4 minutes, and the second aeration flotation is performed for 3 minutes. The gold concentrate is obtained, and the middlings are returned in sequence.

[0163] (4) The gold roughing tailings in step (2) are subjected to two scavenging operations. In the first scavenging operation, 30 g of sodium butyl xanthate per ton of high-sulfur gold iron ore and 4 g of pine oil per ton of high-sulfur gold iron ore are added, stirred for 2 minutes, and aerated flotation is performed for 4 minutes; in the second scavenging operation, 15 g of sodium butyl xanthate per ton of high-sulfur gold iron ore is added, stirred for 2 minutes, and aerated flotation is performed for 3 minutes; gold flotation tailings are obtained, and the middlings are returned in sequence.

[0164] (5) The gold flotation tailings described in step (4) are subjected to weak magnetic roughing with a magnetic field strength of 1500 Oe to obtain weak magnetic roughing concentrate and weak magnetic roughing tailings.

[0165] (6) The weak magnetic roughing concentrate described in step (5) is regrinded, and the particle size with a grinding fineness of 38 μm or less accounts for 80%, and then weak magnetic concentration is performed with a magnetic field strength of 1600 Oe to obtain a weak magnetic concentration concentrate and a weak magnetic concentration tailings; the weak magnetic roughing tailings described in step (6) and the weak magnetic concentration tailings are combined to obtain the final tailings.

[0166] (7) Demagnetizing the weakly magnetic concentrated ore described in step (6) to obtain a demagnetized product.

[0167] (8) The demagnetized product of step (7) is placed in a flotation machine for a second desulfurization roughing. The activator combination for the second roughing is consistent in the mass ratio of sulfuric acid: oxalic acid: copper sulfate: sodium fluorosilicate = 2: 2: 1: 5, and the collector combination for the second roughing is consistent in the mass ratio of butyl sodium xanthate: isopentyl sodium xanthate: BKG721 = 2: 2: 2. Among them, in the first desulfurization roughing, 50g of the combined activator was added per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and then 50g of the combined collector was added per ton of high-sulfur gold-iron ore and 4g of pine oil were added per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and aerated flotation was performed for 3 minutes; in the second desulfurization roughing process, 25g of the combined activator was added per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and then 25g of the combined collector was added per ton of high-sulfur gold-iron ore and 4g of pine oil were added per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and aerated flotation was performed for 3 minutes; iron concentrate and desulfurization roughing concentrate were obtained.

[0168] (9) The desulfurized rougher concentrate in step (8) is placed in a flotation machine for two desulfurization and concentration operations. During the first desulfurization and concentration operation, aeration flotation is performed for 3 minutes to obtain the second sulfur concentrate middlings for sequential return operation; during the second desulfurization and concentration operation, aeration flotation is performed for 2 minutes to obtain the second sulfur concentrate middlings for sequential return operation.

[0169] This comparative example refers to the ore dressing method described in Example 2, except that the gold concentrate described in step (4) is not subjected to the regrinding-magnetic separation to improve quality and reduce impurities.

[0170] Example 2 and Comparative Example 2 were carried out under the condition of the same feed properties. The test indicators of Example 2 and Comparative Example 2 are shown in Table 2.

[0171] Table 2 Test indicators of Example 2 and Comparative Example 2

[0172]

[0173] It can be seen from Table 2 that in Comparative Example 2, no regrinding-magnetic separation is performed to improve quality and reduce impurities. The gold grade in the gold concentrate is reduced from 32.62g per ton of high-sulfur gold-iron ore to 19.22g per ton of high-sulfur gold-iron ore, and the gold grade in the gold concentrate is reduced by 13.4g per ton of high-sulfur gold-iron ore. The grade of the gold concentrate obtained in Comparative Example 2 is significantly reduced, and cannot meet the national standard for the eighth grade of gold concentrate (Au grade>30g / t), which in turn affects the pricing and sales of the gold concentrate.

[0174] Comparative Example 3

[0175] This comparative example provides a beneficiation method for high-sulfur gold iron ore, which is as follows:

[0176] (1) The high-sulfur gold iron ore is ground, and the particle size with a grinding fineness of less than 74 μm accounts for 70%, and then mixed with water to obtain high-sulfur gold iron ore slurry.

[0177] (2) The slurry of the high-sulfur gold-iron ore in step (1) is placed in a flotation machine for two roughing selections, wherein 1000 g of sulfuric acid is added per ton of the high-sulfur gold-iron ore, stirred for 1 minute, and the pH value is adjusted to 6.5; wherein, during the first roughing selection, 100 g of copper sulfate is added per ton of the high-sulfur gold-iron ore, stirred for 2 minutes, 150 g of butyl sodium xanthate is added per ton of the high-sulfur gold-iron ore and 12 g of pine oil are added per ton of the high-sulfur gold-iron ore, stirred for 2 minutes, and aerated flotation is performed for 6 minutes; during the second flotation selection, 50 g of copper sulfate is added per ton of the high-sulfur gold-iron ore, stirred for 2 minutes, 80 g of butyl sodium xanthate is added per ton of the high-sulfur gold-iron ore and 4 g of pine oil are added per ton of the high-sulfur gold-iron ore, stirred for 2 minutes, and aerated flotation is performed for 4 minutes; after two roughing selections, a gold roughing concentrate and a gold roughing tailing are obtained.

[0178] (3) The gold rougher concentrate described in step (2) is placed in a flotation machine for two rounds of concentration. The first aeration flotation is performed for 4 minutes, and the second aeration flotation is performed for 3 minutes. The gold concentrate is obtained, and the middlings are returned in sequence.

[0179] (4) The gold roughing tailings described in step (2) are subjected to two scavengings. In the first scavenging, 25 g of copper sulfate is added per ton of high-sulfur gold iron ore, stirred for 2 minutes, 40 g of butyl sodium xanthate is added per ton of high-sulfur gold iron ore, 4 g of frother is added per ton of high-sulfur gold iron ore, stirred for 2 minutes, and aerated flotation is performed for 4 minutes; in the second scavenging, 10 g of copper sulfate is added per ton of high-sulfur gold iron ore, stirred for 2 minutes, 20 g of butyl sodium xanthate is added per ton of high-sulfur gold iron ore, stirred for 2 minutes, and aerated flotation is performed for 4 minutes; gold flotation tailings are obtained, and the middling ore is sequentially returned.

[0180] (5) The gold flotation tailings described in step (4) are subjected to weak magnetic roughing with a magnetic field strength of 1800 Oe to obtain weak magnetic roughing concentrate and weak magnetic roughing tailings.

[0181] (6) The weak magnetic roughing concentrate described in step (5) is regrinded, and the particle size with a grinding fineness of 38 μm or less accounts for 85%, and then weak magnetic concentration is performed with a magnetic field strength of 1200 Oe to obtain a weak magnetic concentration concentrate and a weak magnetic concentration tailings; the weak magnetic roughing tailings described in step (6) and the weak magnetic concentration tailings are combined to obtain the final tailings.

[0182] (7) Demagnetizing the weakly magnetic concentrated ore described in step (6) to obtain a demagnetized product.

[0183] (8) The demagnetized product of step (7) is placed in a flotation machine for 4 desulfurization roughing. The activator combination for the 4 roughing is consistent in the mass ratio of sulfuric acid: oxalic acid: copper sulfate: sodium fluorosilicate = 3: 3: 2: 5, and the collector combination for the 3 roughing is consistent in the mass ratio of butyl sodium xanthate: isopentyl sodium xanthate: BKG721 = 2: 3: 1. Among them, in the first desulfurization roughing, 100 g of the combined activator was added per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and then 100 g of the combined collector was added per ton of high-sulfur gold-iron ore and 4 g of pine oil were added per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and aerated flotation was performed for 3 minutes; in the second desulfurization roughing process, 50 g of the combined activator was added per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and then 50 g of the combined collector was added per ton of high-sulfur gold-iron ore and 4 g of pine oil were added per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and aerated flotation was performed for 3 minutes; iron concentrate and desulfurization roughing concentrate were obtained. During the third desulfurization roughing process, 25 g of the combined activator was added per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and then 25 g of the combined collector was added per ton of high-sulfur gold-iron ore and 2 g of pine oil were added per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and aerated flotation was performed for 3 minutes; during the fourth desulfurization roughing process, 15 g of the combined activator was added per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and then 15 g of the combined collector was added per ton of high-sulfur gold-iron ore and 2 g of pine oil were added per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and aerated flotation was performed for 3 minutes; iron concentrate and desulfurization roughing concentrate were obtained.

[0184] (9) The desulfurized rougher concentrate in step (8) is placed in a flotation machine for two desulfurization and concentration operations. During the first desulfurization and concentration operation, aeration flotation is performed for 4 minutes to obtain the second sulfur concentrate middlings for sequential return operation; during the second desulfurization and concentration operation, aeration flotation is performed for 3 minutes to obtain the second sulfur concentrate middlings for sequential return operation.

[0185] This comparative example refers to the ore dressing method described in Example 3, except that: the gold concentrate described in step (4) is not subjected to the regrinding-magnetic separation operation for improving quality and reducing impurities.

[0186] Example 3 and Comparative Example 3 were carried out under the condition of the same feed properties. The test indicators of Example 3 and Comparative Example 3 are shown in Table 3.

[0187] Table 3 Experimental indicators of Example 3 and Comparative Example 3

[0188]

[0189] It can be seen from Table 3 that in Comparative Example 3, no regrinding-magnetic separation is performed to improve quality and reduce impurities. The gold grade in the gold concentrate is reduced from 34.11 g / t to 18.74 g / t, and the gold grade in the gold concentrate is reduced by 15.37 g / t. The grade of the gold concentrate obtained in Comparative Example 3 is significantly reduced, and cannot meet the national standard for the eighth grade of gold concentrate (Au grade>30 g / t), which in turn affects the pricing and sales of the gold concentrate.

[0190] Comparative Example 4

[0191] This comparative example provides a method for beneficiating high-sulfur gold iron ore. The beneficiation process is as follows: Figure 1 As shown, the details are as follows:

[0192] (1) The high-sulfur gold iron ore is ground, and the particle size with a grinding fineness of 74 μm or less accounts for 60%, and then mixed with water to obtain high-sulfur gold iron ore slurry.

[0193] (2) The slurry of the high-sulfur gold-iron ore in step (1) is placed in a flotation machine for two roughing selections, wherein 1000 g of sulfuric acid per ton of the high-sulfur gold-iron ore is added, stirred for 1 minute, and the pH value is adjusted to 6.5; wherein, during the first roughing selection, 100 g of butyl sodium xanthate per ton of the high-sulfur gold-iron ore and 8 g of pine oil per ton of the high-sulfur gold-iron ore are added, stirred for 2 minutes, and aerated flotation is performed for 4 minutes; during the second flotation selection, 50 g of butyl sodium xanthate per ton of the high-sulfur gold-iron ore and 4 g of pine oil per ton of the high-sulfur gold-iron ore are added, stirred for 2 minutes, and aerated flotation is performed for 4 minutes; after two roughing selections, a gold roughing concentrate and a gold roughing tailings are obtained.

[0194] (3) The gold rougher concentrate described in step (2) is placed in a flotation machine for two rounds of concentration. The first aeration flotation is performed for 4 minutes, and the second aeration flotation is performed for 3 minutes. The gold concentrate is obtained, and the middlings are returned in sequence.

[0195] (4) The gold concentrate described in step (3) is regrinded, and the regrinding fineness is 80% below 38 μm, and then magnetic separation is performed to improve quality and reduce impurities, and the magnetic field intensity is 2000 Oe to obtain gold concentrate and first sulfur concentrate.

[0196] (5) The gold roughing tailings described in step (2) are subjected to a scavenging operation. 25 g of butyl sodium xanthate per ton of high-sulfur gold iron ore and 4 g of pine oil per ton of high-sulfur gold iron ore are added to the scavenging operation. The ore is stirred for 2 minutes and aerated for flotation for 4 minutes to obtain gold flotation tailings. The middling ore is then returned in sequence.

[0197] (6) The gold flotation tailings described in step (5) are subjected to weak magnetic roughing with a magnetic field strength of 2000 Oe to obtain weak magnetic roughing concentrate and weak magnetic roughing tailings.

[0198] (7) Demagnetizing the weakly magnetic concentrated ore described in step (6) to obtain a demagnetized product.

[0199] (8) The demagnetized product of step (7) is placed in a flotation machine for three desulfurization roughing. The three roughing combination activators have the same dosage ratio, which is sulfuric acid: oxalic acid: copper sulfate: sodium fluorosilicate = 2: 2: 1: 4 by mass, and the three roughing combination collectors have the same dosage ratio, which is butyl sodium xanthate: isopentyl sodium xanthate: BKG721 = 2: 2: 1 by mass. Among them, in the first desulfurization roughing, 50g of combined activator is added per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and then 50g of combined collector is added per ton of high-sulfur gold-iron ore and 4g of pine oil per ton of high-sulfur gold-iron ore are added, stirred for 2 minutes, and aerated flotation is performed for 3 minutes; in the second desulfurization roughing process, 25g of combined activator is added per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and then 25g of combined collector is added per ton of high-sulfur gold-iron ore and 4g of pine oil per ton of high-sulfur gold-iron ore are added, stirred for 2 minutes, and aerated flotation is performed for 3 minutes; iron concentrate and desulfurization roughing concentrate are obtained. In the third desulfurization roughing process, 15g of combined activator is added per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and then 15g of combined collector is added per ton of high-sulfur gold-iron ore and 2g of pine oil per ton of high-sulfur gold-iron ore are added, stirred for 2 minutes, and aerated flotation is performed for 3 minutes; iron concentrate and desulfurization roughing concentrate are obtained.

[0200] Among them, during the first desulfurization roughing process, a total amount of 50g of combined activator was added per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and then a total amount of combined collector was added per ton of high-sulfur gold-iron ore and 5g of pine oil per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and aerated flotation was performed for 3 minutes to obtain iron concentrate and desulfurization roughing concentrate.

[0201] (9) The desulfurized rougher concentrate in step (8) is placed in a flotation machine for two desulfurization and concentration operations. During the first desulfurization and concentration operation, aeration flotation is performed for 3 minutes to obtain the second sulfur concentrate middlings for sequential return operation; during the second desulfurization and concentration operation, aeration flotation is performed for 2 minutes to obtain the second sulfur concentrate middlings for sequential return operation; the first sulfur concentrate in step (4) and the second sulfur concentrate are combined to obtain the final sulfur concentrate.

[0202] This comparative example refers to the ore dressing method described in Example 1, except that the weak magnetic roughing concentrate described in step (7) is not regrinded.

[0203] Example 1 and Comparative Example 4 were carried out under the condition of the same feed properties. The test indicators of Example 1 and Comparative Example 4 are shown in Table 4.

[0204] Table 4 Test indicators of Example 1 and Comparative Example 4

[0205]

[0206] It can be seen from Table 4 that in Example 4, the weak magnetic roughing concentrate regrinding operation is not carried out, and the iron grade in the iron concentrate is reduced from 65.94% to 63.01%, and the iron grade in the iron concentrate is reduced by 2.93%, which affects the iron grade in the iron concentrate and further affects the pricing coefficient of the iron concentrate.

[0207] Comparative Example 5

[0208] This comparative example provides a method for beneficiating high-sulfur gold iron ore. The beneficiation process is as follows: Figure 1 As shown, the details are as follows:

[0209] (1) The high-sulfur gold iron ore is ground, and the particle size with a grinding fineness of 74 μm or less accounts for 60%, and then mixed with water to obtain high-sulfur gold iron ore slurry.

[0210] (2) The slurry of the high-sulfur gold-iron ore in step (1) is placed in a flotation machine for two roughing selections, wherein 1000 g of sulfuric acid per ton of the high-sulfur gold-iron ore is added, stirred for 1 minute, and the pH value is adjusted to 6.5; wherein, during the first roughing selection, 100 g of butyl sodium xanthate per ton of the high-sulfur gold-iron ore and 8 g of pine oil per ton of the high-sulfur gold-iron ore are added, stirred for 2 minutes, and aerated flotation is performed for 4 minutes; during the second flotation selection, 50 g of butyl sodium xanthate per ton of the high-sulfur gold-iron ore and 4 g of pine oil per ton of the high-sulfur gold-iron ore are added, stirred for 2 minutes, and aerated flotation is performed for 4 minutes; after two roughing selections, a gold roughing concentrate and a gold roughing tailings are obtained.

[0211] (3) The gold rougher concentrate described in step (2) is placed in a flotation machine for two rounds of concentration. The first aeration flotation is performed for 4 minutes, and the second aeration flotation is performed for 3 minutes. The gold concentrate is obtained, and the middlings are returned in sequence.

[0212] (4) The gold concentrate described in step (3) is regrinded, and the regrinding fineness is 80% below 38 μm, and then magnetic separation is performed to improve quality and reduce impurities, and the magnetic field intensity is 2000 Oe to obtain gold concentrate and first sulfur concentrate.

[0213] (5) The gold roughing tailings described in step (2) are subjected to a scavenging operation. 25 g of butyl sodium xanthate per ton of high-sulfur gold iron ore and 4 g of pine oil per ton of high-sulfur gold iron ore are added to the scavenging operation. The ore is stirred for 2 minutes and aerated for flotation for 4 minutes to obtain gold flotation tailings. The middling ore is then returned in sequence.

[0214] (6) The gold flotation tailings described in step (5) are subjected to weak magnetic roughing with a magnetic field strength of 2000 Oe to obtain weak magnetic roughing concentrate and weak magnetic roughing tailings.

[0215] (7) The weak magnetic roughing concentrate described in step (6) is regrinded, and the particle size with a grinding fineness of 38 μm or less accounts for 75%, and then weak magnetic concentration is performed with a magnetic field strength of 1400 Oe to obtain a weak magnetic concentration concentrate and a weak magnetic concentration tailings; the weak magnetic roughing tailings described in step (6) and the weak magnetic concentration tailings are combined to obtain the final tailings.

[0216] (8) The demagnetized product of step (7) is placed in a flotation machine for three desulfurization roughing. The three roughing combination activators have the same dosage ratio, which is sulfuric acid: oxalic acid: copper sulfate: sodium fluorosilicate = 2: 2: 1: 4 by mass, and the three roughing combination collectors have the same dosage ratio, which is butyl sodium xanthate: isopentyl sodium xanthate: BKG721 = 2: 2: 1 by mass. Among them, in the first desulfurization roughing, 50g of combined activator is added per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and then 50g of combined collector is added per ton of high-sulfur gold-iron ore and 4g of pine oil per ton of high-sulfur gold-iron ore are added, stirred for 2 minutes, and aerated flotation is performed for 3 minutes; in the second desulfurization roughing process, 25g of combined activator is added per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and then 25g of combined collector is added per ton of high-sulfur gold-iron ore and 4g of pine oil per ton of high-sulfur gold-iron ore are added, stirred for 2 minutes, and aerated flotation is performed for 3 minutes; iron concentrate and desulfurization roughing concentrate are obtained. In the third desulfurization roughing process, 15g of combined activator is added per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and then 15g of combined collector is added per ton of high-sulfur gold-iron ore and 2g of pine oil per ton of high-sulfur gold-iron ore are added, stirred for 2 minutes, and aerated flotation is performed for 3 minutes; iron concentrate and desulfurization roughing concentrate are obtained.

[0217] Among them, during the first desulfurization roughing process, a total amount of 50g of combined activator was added per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and then a total amount of combined collector was added per ton of high-sulfur gold-iron ore and 5g of pine oil per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and aerated flotation was performed for 3 minutes to obtain iron concentrate and desulfurization roughing concentrate.

[0218] (9) The desulfurized rougher concentrate in step (8) is placed in a flotation machine for two desulfurization and concentration operations. During the first desulfurization and concentration operation, aeration flotation is performed for 3 minutes to obtain the second sulfur concentrate middlings for sequential return operation; during the second desulfurization and concentration operation, aeration flotation is performed for 2 minutes to obtain the second sulfur concentrate middlings for sequential return operation; the first sulfur concentrate in step (4) and the second sulfur concentrate are combined to obtain the final sulfur concentrate.

[0219] This comparative example refers to the mineral processing method described in Example 1, except that the pre-demagnetization operation described in step (8) is omitted, the combined activator is changed to a single activator, sulfuric acid, and the combined collector is changed to a single collector, butyl sodium xanthate.

[0220] Example 1 and Comparative Example 5 were carried out under the condition of the same feed properties. The test indicators of Example 1 and Comparative Example 5 are shown in Table 5.

[0221] Table 5 Test indicators of Example 1 and Comparative Example 5

[0222]

[0223] It can be seen from Table 5 that in Example 5, no demagnetization operation was performed, and the sulfur grade in the iron concentrate increased from 0.24% to 0.68%, and the sulfur grade in the iron concentrate increased by 0.44%, which affected the sulfur grade in the iron concentrate, affected the quality of the iron concentrate, and further affected the sales of the iron concentrate and the pricing coefficient at the time of sales.

[0224] Comparative Example 6

[0225] This comparative example provides a conventional beneficiation process for high-sulfur gold-iron ore, namely, a beneficiation method of "magnetic iron separation - iron concentrate desulfurization - magnetic tailings flotation gold separation". Example 1 and comparative example 6 are carried out under the same feed properties. The specific process is as follows:

[0226] (1) Grind the raw ore to obtain a raw ore slurry with a grinding fineness of 74 μm and a particle size of 60%.

[0227] (2) The raw ore described in step (1) is subjected to weak magnetic roughing magnetic separation with a magnetic field strength of 2000 Oe to obtain weak magnetic roughing concentrate and weak magnetic roughing tailings.

[0228] (3) The weak magnetic roughing concentrate described in step (2) is regrinded to a grinding fineness of 38 μm and a particle size of 75%, and then weak magnetic concentration is performed with a magnetic field strength of 1400 Oe to obtain a weak magnetic concentration concentrate and a weak magnetic concentration tailings; the weak magnetic roughing tailings described in step (2) and the weak magnetic concentration tailings are combined to obtain a magnetic separation tailings.

[0229] (4) The weak magnetic concentrated ore in step (3) is placed in a flotation machine for three desulfurization roughing. In the first desulfurization roughing process, 50 g of sodium fluorosilicate was added per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and then 40 g of butyl sodium xanthate and 5 g of pine oil were added per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and aerated flotation was performed for 4 minutes; in the second desulfurization roughing process, 25 g of sodium fluorosilicate was added per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and then 20 g of butyl sodium xanthate and 4 g of frother were added per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and aerated flotation was performed for 4 minutes; in the third desulfurization roughing process, 10 g of sodium fluorosilicate was added per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and then 10 g of butyl sodium xanthate and 4 g of frother were added per ton of high-sulfur gold-iron ore, stirred for 2 minutes, and aerated flotation was performed for 3 minutes; iron concentrate and desulfurization roughing concentrate were obtained.

[0230] (5) The desulfurized rougher concentrate described in step (4) is placed in a flotation machine for two rounds of concentration. The first round of aeration flotation lasts for 3 minutes, and the second round of aeration flotation lasts for 2 minutes to obtain sulfur concentrate. The middlings are returned in sequence.

[0231] (6) The magnetic tailings pulp described in step (3) is placed in a flotation machine for two roughing operations, wherein 1000 g of sulfuric acid is added per ton of high-sulfur gold iron ore, stirred for 1 minute, and the pH value is adjusted to 6.5. During the first roughing operation, 100 g of butyl sodium xanthate per ton of high-sulfur gold iron ore and 8 g of frother per ton of high-sulfur gold iron ore are added, stirred for 2 minutes, and aerated flotation is performed for 4 minutes; during the second roughing operation, 50 g of butyl sodium xanthate per ton of high-sulfur gold iron ore and 4 g of frother per ton of high-sulfur gold iron ore are added, stirred for 2 minutes, and aerated flotation is performed for 4 minutes; and a gold roughing concentrate and a gold roughing tailing are obtained.

[0232] (7) The gold rougher concentrate described in step (6) is placed in a flotation machine for two rounds of concentration. During the first concentration, the gold rougher concentrate is aerated for 4 minutes; during the second concentration, the gold rougher concentrate is aerated for 3 minutes; the gold rougher concentrate is obtained, and the middlings are sequentially returned.

[0233] (8) The gold roughing tailings described in step (6) are subjected to a scavenging operation. 25 g of butyl sodium xanthate per ton of high-sulfur gold iron ore and 4 g of frother per ton of high-sulfur gold iron ore are added to the scavenging operation. The scavenging operation is performed after stirring for 2 minutes and aeration flotation is performed for 4 minutes to obtain gold flotation tailings. The middling ore is then returned in sequence.

[0234] The test results of Example 1 and Comparative Example 6 are shown in Table 6.

[0235] Table 6 Test indicators of Example 1 and Comparative Example 6

[0236]

[0237] It can be seen from Table 6 that: Comparative Example 6 adopts the ore dressing process of "magnetic separation of iron - desulfurization of iron concentrate - magnetic separation tailings flotation gold selection", the ore dressing indicators of gold concentrate, iron concentrate and sulfur concentrate all decrease, the gold grade in the gold concentrate decreases by 8.8g per ton of high-sulfur gold-iron ore, the gold recovery rate decreases by 7.53 percentage points to 83.57%, the iron grade in the iron concentrate decreases by 3.1%, the sulfur grade increases to 0.74%, and the sulfur grade in the sulfur concentrate decreases by 8.03%. In the mineral processing technology of this comparative example, magnetic iron separation operation, most of the pyrrhotite in the ore enters the weak magnetic concentrate, and the subsequent desulfurization is difficult to achieve good results, resulting in excessive sulfur in the final iron concentrate, affecting the quality of the iron concentrate; at the same time, part of the gold enters the iron concentrate, resulting in gold loss; the grade and recovery rate of the gold concentrate in the gold flotation stage both decrease, and the gold resources are not recovered to the maximum extent; the sulfur grade in the sulfur concentrate is significantly reduced, resulting in the sulfur concentrate failing to meet the national standard (grade 5 S ≥ 26%).

[0238] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

[0239] In addition, those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the above claims, any one of the claimed embodiments may be used in any combination. The information disclosed in this background technology section is intended only to deepen the understanding of the overall background technology of the present application and should not be regarded as an admission or in any form of implication that the information constitutes prior art known to those skilled in the art.

Claims

1. A method for beneficiating high-sulfur gold and iron ore, characterized in that: include: The high-sulfur gold-iron ore is ground and pulped to obtain high-sulfur gold-iron ore pulp, the pH value is adjusted to weak acidity, and the high-sulfur gold-iron ore pulp is subjected to gold roughing to obtain gold roughing concentrate and gold roughing tailings; the gold roughing concentrate is subjected to gold concentration to obtain gold concentration concentrate and gold concentration middlings, the gold concentration concentrate is ground again to obtain gold concentration concentrate powder, and the gold concentration concentrate powder is subjected to magnetic separation to improve quality and reduce impurities to obtain gold concentrate and a first sulfur concentrate; The gold roughing tailings are subjected to gold scavenging to obtain flotation tailings and gold scavenging middlings, and the flotation tailings are subjected to weak magnetic roughing to obtain weak magnetic roughing concentrate and weak magnetic roughing tailings; the weak magnetic roughing concentrate is ground again to obtain weak magnetic roughing concentrate powder, and the weak magnetic roughing concentrate powder is subjected to weak magnetic concentration to obtain weak magnetic concentration concentrate and weak magnetic concentration tailings; the weak magnetic concentration concentrate is subjected to demagnetization pretreatment and then mixed with water to obtain demagnetization pretreated slurry, and the demagnetization pretreated slurry is subjected to desulfurization roughing to obtain desulfurization roughing concentrate and desulfurization roughing tailings, and the desulfurization roughing concentrate is subjected to desulfurization concentration to obtain a second sulfur concentrate and desulfurization concentrated middlings, and the first sulfur concentrate and the second sulfur concentrate are combined to obtain a sulfur concentrate; The weak magnetic rougher tailings and the weak magnetic concentrate tailings are combined to obtain tailings, the desulfurized rougher tailings are mixed with water to obtain desulfurized scavenging tailings slurry, and after desulfurized scavenging, iron concentrate and desulfurized scavenging tailings are obtained.

2. The beneficiation method of high-sulfur gold-iron ore according to claim 1, characterized in that: The high-sulfur gold iron ore is ground to a particle size of 55-80% of the high-sulfur gold iron ore and the particle size is not higher than 74 μm.

3. The beneficiation method of high-sulfur gold-iron ore according to claim 1, characterized in that: In the process of the gold roughing, a pH adjuster, a first activator, a first collector, and a first frother are added to the high-sulfur gold iron ore slurry, and at least one of the following conditions is met: a. The pH adjusting agent comprises at least one of sulfuric acid and oxalic acid; b. The first activator comprises copper sulfate; c. The first collector comprises at least one of a higher xanthate and di-n-butyl ammonium dithiophosphate; d. The first foaming agent includes at least one of pine oil, methyl isobutyl carbinol and triethoxybutane.

4. The beneficiation method of high-sulfur gold-iron ore according to claim 3, characterized in that: At least one of the following conditions is met: e. using the pH adjuster to adjust the pH value to 5-7; f. The amount of the first activator is 0-300 g per ton of the high-sulfur gold-iron ore; g. The amount of the first collector is 100-300g per ton of the high-sulfur gold iron ore; h. The dosage of the first foaming agent is 10-50 g per ton of the high-sulfur gold-iron ore.

5. The beneficiation method of high-sulfur gold-iron ore according to claim 1, characterized in that: During the gold concentration process, at least one of the following conditions is met: i. The particle size of 70-90% of the gold concentrate powder is not higher than 38 μm; j. The particle size of 70-90% of the weak magnetic roughing concentrate powder is not higher than 38 μm.

6. The beneficiation method of high-sulfur gold-iron ore according to claim 1, characterized in that: During the gold concentration process, at least one of the following conditions is met: k. The magnetic field strength of the magnetic separation for improving quality and reducing impurities is 1500 -3000 Oe; l. The magnetic field strength of the weak magnetic roughing is 1000 -3000 Oe; m. The magnetic field strength of the weak magnetic selection is 1000-2000 Oe.

7. The beneficiation method of high-sulfur gold-iron ore according to claim 1, characterized in that: In the desulfurization roughing process, the first combined activator, the first combined collector and the second frother are added to the pulp after the demagnetization pretreatment; in the desulfurization scavenging process, the second combined activator, the second combined collector and the third frother are added to the desulfurization scavenging tailings pulp, and at least one of the following conditions is met: n. The first combination activator and the second combination activator each independently include oxalic acid, sulfuric acid, copper sulfate and sodium fluorosilicate; the mass ratio of the usage ratio is sulfuric acid: oxalic acid: copper sulfate: sodium fluorosilicate = (2-4): (2-4): (1-2): (4-8); o. The first combination collector and the second combination collector each independently include butyl sodium xanthate, isopentyl sodium xanthate, and BKG721, and the mass ratio of the usage ratio is butyl sodium xanthate: isopentyl sodium xanthate: BKG721 = (2-5): (2-5): 1; p. The second foaming agent and the third foaming agent each independently include at least one of pine oil, methyl isobutyl carbinol and triethoxybutane.

8. The beneficiation method of high-sulfur gold-iron ore according to claim 7, characterized in that: At least one of the following conditions is met: q. The amount of the first combination activator is 10-150g per ton of high-sulfur gold and iron ore; r. The first combined collector is used in an amount of 30-150 g per ton of high-sulfur gold and iron ore; s. The dosage of the second foaming agent is 5-10g per ton of high-sulfur gold-iron ore.

9. The method for beneficiating high-sulfur gold-iron ore according to claim 7, characterized in that: At least one of the following conditions is met: t. The second combination activator is used in an amount of 5-50g per ton of high-sulfur gold and iron ore; u. The second combined collector is used in an amount of 10-50g per ton of high-sulfur gold and iron ore; v. The dosage of the third foaming agent is 0-10 g per ton of high-sulfur gold-iron ore.

10. The beneficiation method of high-sulfur gold-iron ore according to any one of claims 1 to 9, characterized in that: The gold roughing is carried out 1-2 times, the gold scavenging is carried out 1-2 times, the gold concentrating is carried out 2-3 times, the desulfurization roughing is carried out 1-4 times, the desulfurization scavenging is carried out 1-2 times, and the desulfurization concentrating is carried out 1-2 times.

Images