Ore dressing method for recovering valuable metals from high-grade copper and sulfur paragenetic polymetallic ore

Abstract

The present invention discloses a beneficiation method for recovering valuable metals from high-grade copper and sulfur paragenetic polymetallic ores. The method comprises the following steps: ore grinding and slurry preparation; copper selection using a low-alkalinity depressant; the froth product in the first roughing tank of the first selection is copper concentrate 1; the selected slurry undergoes two roughing, two scavenging, and three concentrating steps to obtain copper concentrate 2; the copper tailings are subjected to two-stage classification, with the first classification followed by sand settling, followed by one roughing, two scavenging, and two concentrating steps. The froth product in the first selection tank is sulfur concentrate 1, and the remaining flotation tank products undergo secondary concentrating to obtain sulfur concentrate 2; the secondary classification sand settling undergoes one roughing and two scavenging steps to obtain sulfur concentrate 3, with the overflow from the secondary classification pre-discarded; sulfur concentrates 1-3 are regrinded, followed by one roughing and one scavenging step to obtain copper concentrate 3; copper concentrates 1 and 2 are copper concentrate; and the tailings from the first scavenging step are sulfur concentrate. The present invention achieves comprehensive recovery of valuable elements from paragenetic polymetallic ores, simplifies the sorting process, and enriches gold and silver in the copper concentrate with a high valuation coefficient.

Description

Technical Field

[0001] The present invention relates to the technical field of mineral processing, and in particular to a mineral processing method for recovering valuable metals from high-grade copper and sulfur paragenetic polymetallic ores. Background Art

[0002] At present, the recovery of associated gold and silver minerals from non-ferrous metal mineral resources has occupied an important position in gold and silver production. The world's production of associated gold recovered from non-ferrous metal mineral resources accounts for about 10% of the total gold production. The main problems in the recovery of associated gold and silver are: (1) The degree of dissociation of mineral monomers is not high, there is little exposed gold and silver, and most of them are wrapped gold and silver. The gold and silver embedded in the mineral body are uneven in size and are mostly in the form of irregular granular, flaky, deep round, and emulsion-shaped forms, and are stored in the mineral body in the form of wrapped gold and silver and intergranular gold and silver, which brings certain difficulties to the recovery of gold and silver. (2) The flotation process is simple and single, which cannot meet the requirements for the recovery of associated gold and silver. (3) The flotation reagent system is difficult to meet the requirements for the recovery of associated gold and silver. There are not many types of gold and silver special collectors currently used in production, and their ability to adapt to ores is not strong. Copper and sulfur separation mainly relies on lime as an inhibitor, and the flotation of copper oxide minerals adopts the method of first sulfidation and then flotation, which affects the recovery of gold and silver. (4) Flotation equipment is aging and outdated and cannot meet the requirements for gold and silver recovery. (5) Some gold and silver-containing sedimentary minerals cannot be recovered in time, resulting in gold and silver losses. There are two types of gold and silver-containing sedimentary minerals: one is sedimentary ore sand, which is mostly in the grinding circuit, such as the classifier trough, the return sand trough, the ball mill, etc.; the other is calcium deposits, such as the foam tank, the slurry pipe, etc. If these gold and silver-containing sediments cannot be recovered in time, some coarse gold and silver particles will be lost in the tailings. (6) There is a lack of sufficient understanding of the recovery of gold and silver lost in by-products and tailings products, and necessary measures have not been taken, resulting in a low overall recovery rate of gold and silver. (7) In economic contracting and management activities, enterprises only pay attention to the assessment of copper indicators and ignore the assessment of gold and silver production indicators. As a result, the reagent system and process conditions in mineral processing production only pay attention to meeting the requirements of copper selection, without taking into account the needs of recovering gold and silver, so that gold and silver cannot be fully recovered. Summary of the Invention

[0003] The present invention discloses a beneficiation method for recovering valuable metals from high-grade copper and sulfur paragenetic polymetallic ore, so as to solve any of the above and other potential problems in the prior art.

[0004] In order to solve the above problems, the technical solution of the present invention is: a beneficiation method for recovering valuable metals from high-grade copper and sulfur paragenetic polymetallic ore, the method specifically comprising the following steps:

[0005] S1) grinding the copper and sulfur coexisting polymetallic ore and then slurrying it, adding a low alkalinity depressant to flotate copper, adding a selective strong collector, and performing roughing first froth separation to directly obtain a high-grade copper concentrate first. The remaining roughing flotation tank products are subjected to two roughing separations, two scavenging separations, and three cleaning separations to obtain a high-grade copper concentrate second.

[0006] S2) the copper tailings are classified in two stages, and the first stage of classification and sand settling is followed by a roughing selection, two scavenging selections, and two cleaning selections. The first cleaning tank directly produces the concentrate to obtain sulfur concentrate 1, and the remaining cleaning tank foam product is subjected to secondary cleaning to obtain sulfur concentrate 2;

[0007] S3) The secondary classification sand settling is followed by one roughing selection and two scavenging selections. The roughing foam product is sulfur concentrate 3, and the secondary classification overflow is pre-discarded. The obtained sulfur concentrate 1, sulfur concentrate 2 and sulfur concentrate 3 are regrinded, and a highly selective collector is added to perform one roughing selection and one scavenging selection to obtain low-grade copper concentrate 3;

[0008] S4) combining the low-grade copper concentrate 3 obtained in S3) with the high-grade copper concentrate 1 and copper concentrate 2 to form copper concentrate; and performing a primary scavenging of the tailings to obtain the final sulfur concentrate.

[0009] Furthermore, the specific steps of S1) are:

[0010] S1.1) Grind the raw ore to -0.74mm, accounting for 60-70%, and add water to adjust the slurry concentration to 33-39%;

[0011] S1.2) 60-100 g / t of a low-alkalinity inhibitor, 30-60 g / t of a collector, and 10-15 g / t of a frother are sequentially added to the slurry for primary copper roughing to obtain a high-grade copper concentrate. 8-15 g / t of a collector and 5-8 g / t of a frother are then added to the tailings for secondary copper roughing to obtain a copper roughing concentrate and a copper roughing tailings slurry.

[0012] S1.3) 5-8 g / t of collector and 3-5 g / t of frother are sequentially added to the copper rougher tailings slurry for primary scavenging to obtain primary scavenging concentrate and primary scavenging tailings; 200-300 g / t of lime is added to the mixing barrel of the copper rougher concentrate, followed by three blank concentrations to obtain high-grade copper concentrate II, which is mixed with high-grade copper concentrate I to form high-grade copper concentrate; the selected tailings are mixed with the primary scavenging concentrate and then ground to a fineness of -0.074 mm accounting for 90-95%, and then returned to the copper primary roughing; 3-5 g / t of collector is sequentially added to the primary scavenging tailings for secondary scavenging to obtain secondary scavenging concentrate and copper flotation tailings, and the secondary scavenging concentrate is returned to the primary scavenging.

[0013] Furthermore, the copper grade of the copper-sulfur paragenetic polymetallic ore is not less than 0.650%, the sulfur grade is not less than 8.50%, and the associated gold and silver grades are not less than 0.35 g / t and 10.00 g / t respectively.

[0014] Furthermore, the components of the low alkalinity inhibitor include a mixture of sodium hydroxide, sodium humate, calcium oxide, ammonium sulfate and calcium chloride; the mass ratio of the components is: 9:0.6:0.2:0.1:0.1;

[0015] The collecting agent is ethylthiocarbamate, and the foaming agent is pine oil.

[0016] Further, the specific steps of S2) are:

[0017] S2.1) The copper flotation tailings are subjected to primary classification in a cyclone to obtain a primary classification overflow and a primary classification grit; the primary classification grit is watered to adjust the concentration to 43% to 48%, and 30 to 40 g / ton of a collector and 3 to 5 g / ton of a frother are sequentially added to perform coarse sulfur roughing to obtain a coarse roughing concentrate and a coarse roughing tailings;

[0018] S2.2) Add 15-20 g / t of collector and 1-3 g / t of frother to the coarse rougher tailings for coarse primary scavenging to obtain coarse primary scavenging ore and coarse primary scavenging tailings;

[0019] S2.3) The sulfur coarse rougher concentrate undergoes a blank selection, and the froth product of the first flotation machine directly becomes sulfur concentrate 1; the remaining froth product of the primary selection becomes the primary selection concentrate, and the primary selection tailings and coarse primary scavenging concentrate are returned to the coarse rougher;

[0020] S2.4) Add 5 to 10 g / t of collector to the primary concentrated ore for secondary concentration to obtain sulfur concentrate II.

[0021] Furthermore, the collector in S2) is butyl xanthate; and the foaming agent is pine oil.

[0022] Further, the specific steps of S3) are:

[0023] S3.1) Return the secondary concentrating tailings to the primary concentrating process; add 5-10 g / t of collector to the coarse primary scavenging tailings for coarse secondary scavenging, obtaining coarse secondary scavenging tailings and coarse secondary scavenging tailings, which are Tailings 1;

[0024] S3.2) Coarse secondary scavenging and separation of ore and coarse primary scavenging; the overflow of primary classification is subjected to secondary classification by cyclone to obtain secondary classification sedimentation and secondary classification overflow, which is tailings three;

[0025] S3.3) adding water to the secondary classification sedimentation to adjust the concentration to 32% to 40%, sequentially adding 25 to 30 g / ton of collector and 2 to 4 g / ton of frother to perform rough separation of sulfur fine particles to obtain sulfur concentrate II, which is then mixed with sulfur concentrate I to form sulfur concentrate;

[0026] S3.4) Add 10-15 g / t of collector to the fine roughing tailings for primary scavenging to obtain fine primary scavenged ore and fine primary scavenged tailings; add 5-8 g / t of collector to the fine primary scavenged tailings for secondary scavenging to obtain fine secondary scavenged ore and fine secondary scavenged tailings, which are tailings II; fine scavenged ore at each level is sequentially returned to the upper level; tailings I, tailings II, and secondary classification overflow are combined into total tailings;

[0027] S3.5) Grind the sulfur concentrate obtained in S3.3) to -0.74 mm, accounting for 90-95%; sequentially add 10-20 g / ton of low alkalinity inhibitor, 5-10 g / ton of collector and 1-3 g / ton of frother to carry out a roughing operation to obtain low-grade copper concentrate and roughing tailings; sequentially add 1-3 g / ton of collector to the roughing tailings to carry out a scavenging operation, and the scavenged tailings are returned to the roughing operation, and the scavenged tailings are high-sulfur concentrate.

[0028] Furthermore, the collector in S3.5) is sodium alkyl ether alcohol sulfate; and the foaming agent is pine oil.

[0029] Furthermore, the copper concentrate recovered by the mineral processing method has a grade greater than 22.00%, a copper recovery rate greater than 90.00%, and gold and silver recovery rates greater than 65% and 78%, respectively, and is mainly enriched in the copper concentrate with a high valuation coefficient; the sulfur concentrate grade is greater than 45.00%, and the sulfur recovery rate is greater than 80.00%.

[0030] The beneficial effects of the present invention are as follows: 1. Due to the adoption of the above technical scheme, the mineral processing method of the present invention adopts a low-alkalinity inhibitor, and preferentially floats out high-grade copper concentrate in a weakly alkaline medium, and the concentrate is directly discharged from the first coarse trough, thereby achieving early and high recovery, reducing the circulation amount of middlings, and the gold recovery rate in the copper concentrate reaches 40%; 2. The foam product of the first flotation machine for selecting coarse sulfur particles directly becomes sulfur concentrate, which is beneficial to improving the sulfur recovery rate; 3. Mineral processing is carried out under conditions of coarse particle size, avoiding over-crushing of ore, and the recovery rate of copper and sulfur stone is high, with low cost; 4. The sulfur concentrate is regrinded and re-selected, and a highly selective collector is adopted to recover part of the gold and silver mixed in the copper concentrate, thereby improving the gold pricing coefficient and improving the copper recovery rate, with a simple process and high indicators. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The present invention is a flowchart of a beneficiation method for recovering valuable metals from high-grade copper and sulfur-paragenetic polymetallic ores. DETAILED DESCRIPTION

[0032] In order to better understand the present invention, the content of the present invention is further illustrated below in conjunction with the embodiments, but the content of the present invention is not limited to the embodiments.

[0033] like Figure 1 As shown, the present invention provides a beneficiation method for recovering valuable metals from high-grade copper and sulfur paragenetic polymetallic ore, which specifically comprises the following steps:

[0034] S1) Grinding and slurrying the copper and sulfur coexisting polymetallic ore, adding a low alkalinity inhibitor to flotate copper, the foam product of the first roughing tank directly becomes high-grade copper concentrate I, and the remaining roughing flotation tank products undergo two roughing, two scavenging, and three cleaning processes to obtain high-grade copper concentrate II;

[0035] S2) the copper tailings are classified in two stages, and the first stage of classification and sand settling is followed by a roughing selection, two scavenging selections, and two cleaning selections. The first tank of the cleaning process directly produces the concentrate to obtain sulfur concentrate 1, and the remaining concentrate is subjected to secondary cleaning in the flotation tank to obtain sulfur concentrate 2;

[0036] S3) After secondary classification and sand settling, a roughing separation and two scavenging separations are performed to obtain sulfur concentrate 3, and the overflow of the secondary classification is pre-discarded; after the sulfur concentrate 1, sulfur concentrate 2 and sulfur concentrate 3 are regrinded, a highly selective collector is added to perform a roughing separation and a scavenging separation to obtain low-grade copper concentrate 3;

[0037] S4) combining the low-grade copper concentrate 3 obtained in S3) with the high-grade copper concentrate 1 and the copper concentrate 2 to form copper concentrate; and performing a primary scavenging of the tailings to obtain the final sulfur concentrate.

[0038] The specific steps of S1) are:

[0039] S1.1) Grind the raw ore to -0.74mm, accounting for 60-70%, and add water to adjust the slurry concentration to 33-39%;

[0040] S1.2) 60-100 g / t of a low-alkalinity inhibitor, 30-60 g / t of a collector, and 10-15 g / t of a frother are sequentially added to the slurry for primary copper roughing to obtain a high-grade copper concentrate. 8-15 g / t of a collector and 5-8 g / t of a frother are then added to the tailings for secondary copper roughing to obtain a copper roughing concentrate and a copper roughing tailings slurry.

[0041] S1.3) 5-8 g / t of collector and 3-5 g / t of frother are sequentially added to the copper rougher tailings slurry for primary scavenging to obtain primary scavenging concentrate and primary scavenging tailings; 200-300 g / t of lime is added to the mixing barrel of the copper rougher concentrate, followed by three blank concentrations to obtain high-grade copper concentrate II, which is mixed with high-grade copper concentrate I to form high-grade copper concentrate; the selected tailings are mixed with the primary scavenging concentrate and then ground to a fineness of -0.074 mm accounting for 90-95%, and then returned to the copper primary roughing; 3-5 g / t of collector is sequentially added to the primary scavenging tailings for secondary scavenging to obtain secondary scavenging concentrate and copper flotation tailings, and the secondary scavenging concentrate is returned to the primary scavenging.

[0042] The components of the low alkalinity inhibitor include a mixture of sodium hydroxide, sodium humate, calcium oxide, ammonium sulfate and calcium chloride; the mass ratio of the components is: 9:0.6:0.2:0.1:0.1;

[0043] The collecting agent is ethylthiocarbamate, and the foaming agent is pine oil.

[0044] The specific steps of S2) are:

[0045] S2.1) The copper flotation tailings are subjected to primary classification in a cyclone to obtain a primary classification overflow and a primary classification grit; the primary classification grit is watered to adjust the concentration to 43% to 48%, and 30 to 40 g / ton of a collector and 3 to 5 g / ton of a frother are sequentially added to perform coarse sulfur roughing to obtain a coarse roughing concentrate and a coarse roughing tailings;

[0046] S2.2) Add 15-20 g / t of collector and 1-3 g / t of frother to the coarse rougher tailings for coarse primary scavenging to obtain coarse primary scavenging ore and coarse primary scavenging tailings;

[0047] S2.3) The sulfur coarse rougher concentrate undergoes a blank selection process, and the froth product of the first flotation machine directly becomes sulfur concentrate. The remaining froth product of the primary selection process becomes the primary selection concentrate, and the primary selection tailings and coarse primary scavenging concentrate are returned to the coarse rougher process.

[0048] S2.4) Add 5-10 g / t of butyl xanthate as a collector to the primary concentrated ore for secondary concentration to obtain sulfur concentrate 2.

[0049] The collector in S2) is butyl xanthate; the foaming agent is pine oil.

[0050] The specific steps of S3) are:

[0051] S3.1) Return the secondary concentrating tailings to the primary concentrating process; add 5-10 g / t of collector to the coarse primary scavenging tailings for secondary scavenging, obtaining coarse secondary scavenging tailings and coarse secondary scavenging tailings, which are referred to as tailings 1;

[0052] S3.2) Coarse secondary scavenging and separation of ore and coarse primary scavenging; the overflow of primary classification is subjected to secondary classification by cyclone to obtain secondary classification sedimentation and secondary classification overflow, which is tailings three;

[0053] S3.3) adding water to the secondary classification sedimentation to adjust the concentration to 32% to 40%, sequentially adding 25 to 30 g / ton of collector and 2 to 4 g / ton of frother to perform rough separation of sulfur fine particles to obtain sulfur concentrate II, which is then mixed with sulfur concentrate I to form sulfur concentrate;

[0054] S3.4) Add 10-15 g / t of collector to the fine roughing tailings for primary scavenging to obtain fine primary scavenged ore and fine primary scavenged tailings; add 5-8 g / t of collector to the fine primary scavenged tailings for secondary scavenging to obtain fine secondary scavenged ore and fine secondary scavenged tailings, which are tailings II; fine scavenged ore at each level is sequentially returned to the upper level; tailings I, tailings II, and secondary classification overflow are combined into total tailings;

[0055] S3.5) Grind the sulfur concentrate obtained in S3.3) to -0.74 mm, accounting for 90-95%; sequentially add 10-20 g / ton of low alkalinity inhibitor, 5-10 g / ton of collector and 1-3 g / ton of frother to carry out a roughing operation to obtain low-grade copper concentrate and roughing tailings; sequentially add 1-3 g / ton of collector to the roughing tailings to carry out a scavenging operation, and the scavenged tailings are returned to the roughing operation, and the scavenged tailings are high-sulfur concentrate.

[0056] The collector is alkyl ether alcohol sodium sulfate.

[0057] The copper concentrate grade of the beneficiation method is greater than 22.00%, the copper recovery rate is greater than 90.00%, the gold and silver recovery rates are greater than 65% and 78% respectively, and the gold and silver are mainly enriched in the copper concentrate with a high valuation coefficient; the sulfur concentrate grade is greater than 45.00%, and the sulfur recovery rate is greater than 80.00%.

[0058] Example:

[0059] Case 1: A polymetallic copper-sulfur ore in Jiangxi Province. The copper mineral in the ore is primarily chalcopyrite, with minor amounts of tetrahedrite, bornite, and chalcocite. Other metallic minerals are primarily pyrite and marcasite, with minor amounts of limonite and magnetite. Non-metallic minerals are primarily andradite, quartz, calcite, and dolomite, followed by grossular garnet, chlorite, kaolinite, potassium feldspar, plagioclase, and diopside. The average grades of the main valuable elements copper, sulfur, gold, and silver in the ore are 0.71%, 10.86%, 0.37g / t, and 12.49g / t, respectively.

[0060] The raw ore was ground to a fineness of -0.74 mm, accounting for 65%. 75 g / t of inhibitors, 50 g / t of ethionamide, and 12 g / t of pine oil were added for primary roughing of copper. The first roughing tank produced high-grade copper concentrate 1 (yield 0.50%, copper grade 23.00%, copper recovery rate 16.20%; gold grade 5.35 g / t, gold recovery rate 7.23%; silver grade 225.89 g / t, silver recovery rate 10.77%). 10 g / ton of ethiocarbamate and 6 g / ton of frother were added for copper secondary roughing. The remaining copper primary roughing and copper secondary roughing foam products were copper roughing concentrate, and the copper secondary roughing tailings were copper roughing tailings. 200 g / ton of lime was added to the mixing drum of the copper roughing concentrate, and three blank concentrations were performed to obtain high-grade copper concentrate II (yield 2.05%, copper grade 24.50%, copper recovery rate 70.74%; gold grade 5.88 g / t, gold recovery rate 32.58%; silver grade 248.64 g / t, silver recovery rate 48.59%). 5 g / ton of ethiocarbamate and 3 g / ton of pine oil were added to the copper roughing tailings slurry for primary scavenging to obtain primary scavenging concentrate and primary scavenging tailings. The primary scavenging concentrate and primary scavenging tailings were reground to a fineness of -0.074 mm, accounting for 98%, and then returned to the primary roughing process. The primary scavenging tailings were sequentially treated with 2g / t of ethionamide for secondary scavenging, yielding secondary scavenging concentrate and copper flotation tailings. The secondary scavenging concentrate was returned to the primary scavenging process. The copper flotation tailings were subjected to primary scavenging in a cyclone, yielding primary scavenging overflow and primary scavenging sand.After the primary classification and sedimentation, water was added to adjust the concentration to 43% to 48%. Then, 30 g / ton of butyl xanthate and 5 g / ton of frother (pine oil) were added in sequence to carry out sulfur coarse roughing to obtain coarse roughing concentrate and coarse roughing tailings. The coarse roughing tailings were added with 15 g / ton of collector and 2 g / ton of frother to carry out coarse primary scavenging to obtain coarse primary scavenging concentrate and coarse primary scavenging tailings. The sulfur coarse roughing concentrate was subjected to primary blank selection, and the froth product of the first flotation machine directly became sulfur concentrate. (yield 4.84%, sulfur grade 44.87%, sulfur recovery rate 20.00; gold grade 0. 57g / t, gold recovery rate 7.46%; silver grade 13.66g / t, silver recovery rate 5.29%); the remaining primary concentrating foam product is primary concentrating concentrate, and the primary concentrating tailings and coarse-grained primary scavenging concentrate are returned to the coarse-grained roughing; the primary concentrating concentrate is added with the collector butyl xanthate 6g / t for secondary concentrating to obtain sulfur concentrate II (yield 9.77%, sulfur grade 45.89%, sulfur recovery rate 41.28%; gold grade 0.55g / t, gold recovery rate 14.52%; silver grade 12.87g / t, silver recovery rate 10.07%), and the secondary concentrating tailings are Return to the primary concentration; add 2 g / ton of butyl xanthate to the coarse primary scavenging tailings for coarse secondary scavenging to obtain coarse secondary scavenging ore and coarse secondary scavenging tailings (tailings 1); the coarse secondary scavenging ore is transferred to the coarse primary scavenging operation; the primary classification overflow is subjected to secondary classification by a cyclone to obtain secondary classification overflow (tailings 3), and secondary classification sand is set; water is added to the secondary classification sand to adjust the concentration to 32% to 40%, and 25 g / ton of butyl xanthate and 3 g / ton of pine oil are added in sequence to carry out sulfur fine particle roughing to obtain sulfur concentrate 3 (yield 5.32%, sulfur grade 44.78%, sulfur recovery rate 2 1.94%; gold grade 0.42g / t, gold recovery rate 6.04%; silver grade 11.20g / t, silver recovery rate 4.77%), and mixed with sulfur concentrate I to form sulfur concentrate; 15g / ton of butyl xanthate was added to the fine roughing tailings for primary scavenging to obtain fine primary scavenging middlings and fine primary scavenging tailings; 5g / ton of collector was added to the fine primary scavenging tailings for secondary scavenging to obtain fine secondary scavenging middlings and fine secondary scavenging tailings (tailings II); fine scavenging middlings at each level were returned to the upper operation in sequence; tailings I, tailings II and secondary classification overflow were combined into total tailings.

[0061] The sulfur concentrate was reground to -0.74 mm, accounting for 95%; 15 g / ton of inhibitor (a mixture of sodium hydroxide, sodium humate, calcium oxide, ammonium sulfate, and calcium chloride), 15 g / ton of collector (sodium alkyl ether alcohol sulfate), and 2 g / ton of foaming agent (pine oil) were sequentially added for a roughing operation to obtain low-grade copper concentrate No. 3 (yield 0.36%, copper grade 6.50%, copper recovery rate 3.30%; gold grade 1.49 g / t, gold recovery rate 1.45%; silver grade 66.88 g / t, silver recovery rate 2.30%) and roughing tailings; 3 g / ton of sodium alkyl ether alcohol sulfate was sequentially added to the roughing tailings for a scavenging operation, and the scavenged tailings were returned to the roughing operation. The tailings from the first sweeping process were high-sulfur concentrate (yield 19.57%, sulfur grade 45.53%, sulfur recovery rate 82.04%; gold grade 0.48 g / t, gold recovery rate 26.57%; silver grade 8.59 g / t, silver recovery rate 17.83%); the low-grade copper concentrate III was mixed with the high-grade copper concentrate I and copper concentrate II to form copper concentrate (yield 2.91%, copper grade 22.02%, copper recovery rate 90.23%; gold grade 5.25 g / t, gold recovery rate 41.26%; silver grade 222.25 g / t, silver recovery rate 61.65%), with the recoveries of associated gold and silver reaching 67.83% and 79.49%, respectively.

[0062] Implementation 2: A copper-sulfur coexisting polymetallic ore with a copper grade of 0.750%, a sulfur grade of 9.00%, and associated gold and silver grades of 0.51g / t and 15.33g / t.

[0063] The raw ore is ground to -0.74mm, accounting for 60%. A single-agent system is implemented, with two roughing rounds, three scavenging rounds, and three concentrating rounds. The process involves regrinding the tailings from the concentrate, the scavenging concentrate, and the middlings from the scavenging concentrate. The foam product from the first trough of the roughing round is copper concentrate one, and the foam product from the concentrate three is copper concentrate two. The copper tailings are classified by cyclones. The grit settling in the primary classification cyclone is carried out using a process of one roughing round, three scavenging rounds, and two concentrating rounds. The foam product from the first trough of the concentrate one is sulfur concentrate one, and the foam product from the concentrate two is sulfur concentrate two. The overflow from the primary classification is subjected to one roughing round, two scavenging rounds, and two concentrating rounds to produce sulfur concentrate two. Sulfur concentrates one and two are regrinded to -0.074mm, accounting for 90%. After one roughing round and one scavenging round, copper concentrate three is produced. The scavenging tailings are sulfur concentrate, and copper concentrates one, two, and three are combined to form copper concentrate.

[0064] The copper grade of the copper concentrate is 23.50%, the copper recovery rate is 91.00%, the gold recovery rate is 43.50%, and the silver recovery rate is 65.05%; the sulfur grade of the sulfur concentrate is 45.00%, the sulfur recovery rate is 85.00%, the gold recovery rate is 27.00%, and the silver recovery rate is 19.50%.

[0065] The above describes in detail a beneficiation method for recovering valuable metals from a paragenetic polymetallic ore provided in the examples of this application. The description of the above examples is intended only to facilitate understanding of the method and core concept of this application. Furthermore, those skilled in the art will appreciate that variations in the specific implementation and scope of application may occur based on the concepts of this application. In summary, this specification should not be construed as limiting this application.

[0066] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different nouns to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. For example, "including" and "comprising" mentioned throughout the specification and claims are open-ended terms, so they should be interpreted as "including / including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve the technical problems within a certain error range and basically achieve the technical effects. The subsequent description in the specification is a preferred embodiment of the present application, but the description is for the purpose of illustrating the general principles of the present application, and is not used to limit the scope of the present application. The scope of protection of the present application shall be as defined in the attached claims.

[0067] It should also be noted that the terms "include," "comprises," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a product or system comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such product or system. In the absence of further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the product or system comprising the element.

[0068] It should be understood that the term "and / or" as used herein is merely a description of the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0069] The above description shows and describes several preferred embodiments of the present application. However, as previously mentioned, it should be understood that the present application is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Instead, the present application can be used in various other combinations, modifications, and environments and can be modified within the scope of the application concept described herein through the above teachings or technology or knowledge in the relevant field. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present application should be protected by the claims appended hereto.

Claims

1. A beneficiation method for recovering valuable metals from high-grade copper and sulfur-paragenetic polymetallic ores, characterized in that: The method specifically comprises the following steps: S1) grinding the copper and sulfur coexisting polymetallic ore and then slurrying it, adding a low alkalinity depressant to flotate copper, adding a selective strong collector, and performing roughing first froth separation to directly obtain a high-grade copper concentrate first. The remaining roughing flotation tank products are subjected to two roughing separations, two scavenging separations, and three cleaning separations to obtain a high-grade copper concentrate second. S2) the copper tailings are classified in two stages, and the first stage of classification and sand settling is followed by a roughing selection, two scavenging selections, and two cleaning selections. The first cleaning tank directly produces the concentrate to obtain sulfur concentrate 1, and the remaining cleaning tank foam product is subjected to secondary cleaning to obtain sulfur concentrate 2; S3) The secondary classification sand settling is followed by one roughing selection and two scavenging selections. The roughing foam product is sulfur concentrate 3, and the secondary classification overflow is pre-discarded. The obtained sulfur concentrate 1, sulfur concentrate 2, and sulfur concentrate 3 are regrinded, and a highly selective collector is added to perform one roughing selection and one scavenging selection to obtain low-grade copper concentrate 3; S4) combining the low-grade copper concentrate 3 obtained in S3) with the high-grade copper concentrate 1 and copper concentrate 2 to form copper concentrate; and performing a primary scavenging of the tailings to obtain the final sulfur concentrate.

2. The mineral processing method according to claim 1, characterized in that: The specific steps of S1) are: S1.1) Grind the raw ore into a slurry of a certain particle size, and then add water to adjust the slurry concentration; S1.2) 60-100 g / t of a low-alkalinity inhibitor, 30-60 g / t of a collector, and 10-15 g / t of a frother are sequentially added to the slurry for primary copper roughing to obtain a high-grade copper concentrate. 8-15 g / t of a collector and 5-8 g / t of a frother are then added to the tailings for secondary copper roughing to obtain a copper roughing concentrate and a copper roughing tailings slurry. S1.3) 5-8 g / t of collector and 3-5 g / t of frother are sequentially added to the copper rougher tailings slurry for primary scavenging to obtain primary scavenging concentrate and primary scavenging tailings; 200-300 g / t of lime is added to the mixing barrel of the copper rougher concentrate, followed by three blank concentrations to obtain high-grade copper concentrate II, which is mixed with high-grade copper concentrate I to form high-grade copper concentrate; the selected tailings are mixed with the primary scavenging concentrate and then ground to a fineness of -0.074 mm accounting for 90-95%, and then returned to the copper primary roughing; 3-5 g / t of collector is sequentially added to the primary scavenging tailings for secondary scavenging to obtain secondary scavenging concentrate and copper flotation tailings, and the secondary scavenging concentrate is returned to the primary scavenging.

3. The mineral processing method according to claim 2, characterized in that: The copper grade of the copper-sulfur paragenetic polymetallic ore is not less than 0.650%, the sulfur grade is not less than 8.50%, and the associated gold and silver grades are not less than 0.35g / t and 10.00g / t respectively.

4. The mineral processing method according to claim 2, characterized in that: The particle size of the ore pulp after grinding is -0.74 mm, accounting for 60-70%; the concentration of the ore pulp is 33-39%.

5. The mineral processing method according to claim 2, characterized in that: The components of the low alkalinity inhibitor include a mixture of sodium hydroxide, sodium humate, calcium oxide, ammonium sulfate and calcium chloride; the mass ratio of the components is: 9:0.6:0.2:0.1:0.1; The collecting agent is ethylthiocarbamate, and the foaming agent is pine oil.

6. The mineral processing method according to claim 1, characterized in that: The specific steps of S2) are: S2.1) The copper flotation tailings are subjected to primary classification in a cyclone to obtain a primary classification overflow and a primary classification grit; the primary classification grit is watered to adjust the concentration to 43% to 48%, and 30 to 40 g / ton of a collector and 3 to 5 g / ton of a frother are sequentially added to perform coarse sulfur roughing to obtain a coarse roughing concentrate and a coarse roughing tailings; S2.2) Add 15-20 g / t of collector and 1-3 g / t of frother to the coarse rougher tailings for coarse primary scavenging to obtain coarse primary scavenging ore and coarse primary scavenging tailings; S2.3) The sulfur coarse rougher concentrate undergoes a blank selection process, and the froth product of the first flotation machine directly becomes sulfur concentrate. The remaining froth product of the primary selection process becomes the primary selection concentrate, and the primary selection tailings and coarse primary scavenging concentrate are returned to the coarse rougher process. S2.4) Add 5-10 g / t of butyl xanthate as a collector to the primary concentrated ore for secondary concentration to obtain sulfur concentrate 2.

7. The mineral processing method according to claim 6, characterized in that: The collector in S2) is butyl xanthate; the foaming agent is pine oil.

8. The mineral processing method according to claim 1, characterized in that: The specific steps of S3) are: S3.1) Return the secondary concentrating tailings to the primary concentrating process; add 5-10 g / t of collector to the coarse primary scavenging tailings for secondary scavenging, obtaining coarse secondary scavenging tailings and coarse secondary scavenging tailings, which are referred to as tailings 1; S3.2) Coarse secondary scavenging and separation of ore and coarse primary scavenging; the overflow of primary classification is subjected to secondary classification by cyclone to obtain secondary classification sedimentation and secondary classification overflow, which is tailings three; S3.3) adding water to the secondary classification sedimentation to adjust the concentration to 32% to 40%, sequentially adding 25 to 30 g / ton of collector and 2 to 4 g / ton of frother to perform rough separation of sulfur fine particles to obtain sulfur concentrate II, which is then mixed with sulfur concentrate I to form sulfur concentrate; S3.4) Add 10-15 g / t of collector to the fine roughing tailings for primary scavenging to obtain fine primary scavenged ore and fine primary scavenged tailings; add 5-8 g / t of collector to the fine primary scavenged tailings for secondary scavenging to obtain fine secondary scavenged ore and fine secondary scavenged tailings, which are tailings II; fine scavenged ore at each level is sequentially returned to the upper level; tailings I, tailings II, and secondary classification overflow are combined into total tailings; S3.5) Grind the sulfur concentrate obtained in S3.3) to -0.74 mm, accounting for 90-95%; sequentially add 10-20 g / ton of low alkalinity inhibitor, 5-10 g / ton of collector and 1-3 g / ton of frother to carry out a roughing operation to obtain low-grade copper concentrate 3 and roughing tailings; sequentially add 1-3 g / ton of collector to the roughing tailings to carry out a scavenging operation, and the scavenged tailings are returned to the roughing operation, and the scavenged tailings are high-sulfur concentrate.

9. The mineral processing method according to claim 8, characterized in that: The collector in S3.5) is sodium alkyl ether alcohol sulfate; the foaming agent is pine oil.

10. The mineral processing method according to claim 1, characterized in that: The copper concentrate recovered by the mineral processing method has a grade greater than 22.00%, a copper recovery rate greater than 90.00%, and gold and silver recovery rates greater than 65% and 78% respectively, and is mainly enriched in the copper concentrate with a high valuation coefficient; the sulfur concentrate grade is greater than 45.00%, and the sulfur recovery rate is greater than 80.00%.

Images