A copper-sulfur separation combined inhibitor and flotation method for copper sulfide ore

Abstract

The present application provides a copper-sulfur separation combined inhibitor and a flotation method for copper sulfide ore, and relates to the field of mineral flotation inhibitors. The raw materials of the copper-sulfur separation combined inhibitor include: sodium cyanate, sodium cyanurate and sodium carbonate; the mass ratio of the sodium cyanate, the sodium cyanurate and the sodium carbonate is (5-7): (1-3): 1. The copper-sulfur separation combined inhibitor can replace the traditional lime inhibitor, realize the environmental protection and efficient recovery of copper-sulfur resources, and overcome the various disadvantages of using lime as an inhibitor, such as the sticky foam resulting in low copper concentrate grade, calcium corrosion of pipelines and equipment, high pH value of tailings water and environmental pollution.

Description

Technical Field

[0001] The present application relates to the field of mineral flotation inhibitors, and in particular to a copper-sulfur separation combined inhibitor and a flotation method for copper sulfide ore. Background Art

[0002] Copper plays an irreplaceable role in key fields such as electrical, light industry, machinery manufacturing, construction and defense industry due to its excellent ductility, excellent thermal and electrical conductivity. According to statistics, copper sulfide ore resources account for more than 75% of the world's proven copper resources. However, in the flotation process of copper sulfide ore, the similar flotation characteristics of copper and sulfur pose a major challenge. To ensure the purity and quality of copper concentrate, traditional processes often rely on the addition of a large amount of sulfur inhibitors, especially lime, to achieve effective separation of copper and sulfur.

[0003] However, the use of lime as an inhibitor has many drawbacks that cannot be ignored: first, it needs to be prepared into lime milk in advance, which is a cumbersome process and accompanied by safety risks brought by strong alkali; second, the scaling characteristics of lime often lead to pipeline blockage, and the instability of the amount added also exacerbates the fluctuation of industrial production indicators; third, the large-scale use of lime will also cause flotation foam to become sticky, affecting the efficiency of pipeline transportation and the filtration effect of concentrate. At the same time, the high alkalinity of tailings (pH value often exceeds 10) not only limits the environmental discharge of tailings, but also poses a potential threat to the environment. In addition, the mining and burning process of lime itself is a major burden on the environment. With the increasingly stringent global environmental protection policies, the sustainability of this traditional practice is facing severe tests.

[0004] Although some researchers have explored the use of strong oxidants such as calcium hypochlorite and potassium permanganate as substitutes for lime in order to improve the copper-sulfur separation effect, these methods also face difficulties such as easy failure of the agents, high storage and operation risks, and large fluctuations in production indicators, making them difficult to promote and apply in large-scale industrial production.

[0005] Therefore, how to recycle copper sulfide ore in a more environmentally friendly and efficient way is a difficult problem that needs to be solved urgently in copper-sulfur ore beneficiation. Summary of the invention

[0006] The purpose of the present application is to provide a copper-sulfur separation combined inhibitor and a flotation method for copper sulfide ore to solve the above problems.

[0007] To achieve the above objectives, the first aspect of the present application provides a copper-sulfur separation combined inhibitor, the raw materials of which include:

[0008] Sodium cyanate, sodium cyanurate and sodium carbonate;

[0009] The mass ratio of the sodium cyanate, the sodium cyanurate and the sodium carbonate is (5-7):(1-3):1.

[0010] Optionally, the mass ratio of the sodium cyanate, the sodium cyanurate and the sodium carbonate is (6-7): (2-3): 1.

[0011] The second aspect of the present application provides a flotation method for copper sulfide ore, comprising:

[0012] Mixing copper sulfide ore and water to obtain ore slurry;

[0013] The ore pulp, the copper-sulfur separation combined inhibitor, the collector, and the frother are mixed to perform roughing to obtain a copper roughing concentrate;

[0014] The copper roughing concentrate and the copper-sulfur separation combination inhibitor are mixed and concentrated to obtain copper concentrate.

[0015] Optionally, the flotation method of the copper sulfide ore satisfies at least one of the following conditions:

[0016] A. The fineness of the copper sulfide ore is -0.074 mm, accounting for 55%-80%;

[0017] B. The mass concentration of the slurry is 30%-45%.

[0018] Optionally, the flotation method of the copper sulfide ore satisfies at least one of the following conditions:

[0019] A. The collector includes one or more of ethiocarbamate, ester 105, sodium isobutyl black medicine, and ether aminothioester;

[0020] B. The foaming agent includes one or more of pine oil, No. 2 oil, and methyl isobutyl carbinol.

[0021] Optionally, the flotation method of the copper sulfide ore satisfies at least one of the following conditions:

[0022] A. The amount of the collector used in the roughing process is 30g / t-150g / t of raw ore;

[0023] B. The dosage of the foaming agent is 10g / t-50g / t of raw ore.

[0024] Optionally, the flotation method of the copper sulfide ore satisfies at least one of the following conditions:

[0025] A. The dosage of the copper-sulfur separation combined inhibitor in the roughing process is 50 g / t-400 g / t of raw ore;

[0026] B. The dosage of the copper-sulfur separation combined inhibitor in the concentration process is 16 g / t to 120 g / t of raw ore;

[0027] C. The number of times of selection is at least 3 times.

[0028] Optionally, the selection includes a first selection, a second selection, and a third selection performed in sequence;

[0029] The amount of the copper-sulfur separation combined inhibitor used in the first concentration process is 10 g / t to 50 g / t of raw ore;

[0030] The dosage of the copper-sulfur separation combined inhibitor in the second concentration process is 5 g / t-40 g / t of raw ore;

[0031] The dosage of the copper-sulfur separation combination inhibitor in the third concentration process is 1 g / t-30 g / t of raw ore.

[0032] Optionally, the roughing also produces copper roughing tailings;

[0033] The copper roughing tailings and the collector are mixed and scavenged to obtain copper scavenged tailings;

[0034] The copper ore is returned to the upper level for separation.

[0035] Optionally, the flotation method of the copper sulfide ore satisfies at least one of the following conditions:

[0036] A. The number of scanning is at least 2 times;

[0037] B. The amount of the collector used in the scavenging process is 3g / t-30g / t of raw ore.

[0038] Compared with the prior art, the beneficial effects of this application include:

[0039] The copper-sulfur separation combined inhibitor provided in the present application includes raw materials such as sodium cyanate, sodium cyanurate and sodium carbonate. The copper-sulfur separation inhibitor prepared by using the above raw materials in a specific dosage ratio has the characteristics of strong inhibition ability and good selectivity, and a relatively small dosage can be used in the copper-sulfur beneficiation process to achieve a better inhibition effect; the copper-sulfur separation combined inhibitor can replace the traditional lime inhibitor, realize the environmentally friendly and efficient recovery of copper-sulfur resources, and overcome the various disadvantages of using lime as an inhibitor, such as foam stickiness resulting in low copper concentrate grade, calcium corrosion of pipelines and equipment, high pH value of tailings water and environmental pollution.

[0040] The flotation method of copper sulfide ore provided in the present application overcomes the disadvantages of the traditional lime method that a large amount of lime needs to be added to cause foam and stickiness, resulting in low grade of copper concentrate, calcium corrosion of pipelines and equipment, high pH value of tailings water and environmental pollution, etc. by adopting the above-mentioned specific copper-sulfur separation combined inhibitor during the flotation process of copper sulfide ore, thereby achieving efficient recovery of copper and sulfur resources; at the same time, a specific type of collector is used in combination with the copper-sulfur separation combined inhibitor, so that sulfur can be better suppressed and copper can be selectively floated, thereby ensuring the grade and recovery rate of copper concentrate and ensuring efficient recovery of copper sulfide ore. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] 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.

[0042] Figure 1 This is a schematic flow chart of the flotation method for copper sulfide ore provided in Example 1. DETAILED DESCRIPTION

[0043] As used herein:

[0044] "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.

[0045] 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.

[0046] 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.

[0047] In these examples, parts and percentages are by mass unless otherwise indicated.

[0048] "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.

[0049] "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).

[0050] In a first aspect, the present application provides a copper-sulfur separation combined inhibitor, the raw materials of which include:

[0051] Sodium cyanate, sodium cyanurate and sodium carbonate;

[0052] The mass ratio of the sodium cyanate, the sodium cyanurate and the sodium carbonate is (5-7):(1-3):1.

[0053] Optionally, the mass ratio of sodium cyanate, sodium cyanurate and sodium carbonate can be 5:1:1, 6:1:1, 7:1:1, 6:2:1, 6:3:1, 7:3:1, 6.5:2:1, 6.5:3:1, 7:2.5:1, 6:2.5:1 or any value between (5-7):(1-3):1.

[0054] It should be noted that sulfur-containing copper ores include pyrite. Pyrite crystals belong to the isometric crystal system. Its crystals have the same physical and chemical properties in all directions. The main chemical component is FeS2, i.e. ferrous sulfide, with an iron content of up to 46.6% and a sulfur content of 53.45%. The flotation method of sulfide copper ore is suitable for processing copper-sulfide ores, especially for high-sulfur and difficult-to-process copper-sulfide ores with a S content of more than 10%. The use of this specific combined inhibitor can effectively improve the mineral processing effect.

[0055] It should also be noted that the copper-sulfur separation combined inhibitor is made of a specific amount of sodium cyanate, sodium cyanurate and sodium carbonate. Among them, the cyanate ion (CNO - ), will react with metal ions on the surface of pyrite (such as Fe 2+ or Fe 3+ ) to generate insoluble compounds or complexes, and form a hydrophilic film on the surface of pyrite, which can effectively prevent the interaction between pyrite and collector; the cyanurate ion (C3N3O3 3- ), given its complex structure and multiple potential active sites, metal ions (such as Fe 2+ or Fe 3+ ) can form a more stable complex, which covers the pyrite surface more tightly, occupies the active sites more fully, and has a stronger inhibitory effect. At the same time, the cyanate ion (CNO - ) and cyanurate ion (C3N3O3 3-) has an intermediate valence (nitrogen in cyanate is -3 valence), which makes it oxidizable and can obtain electrons and reduce its valence; while the sulfur contained in pyrite is reducing. When the two come into contact with each other, the valence state of sulfur will change, which will destroy the crystal structure and surface chemical properties of pyrite, and finally reduce the floatability of pyrite, thus achieving the purpose of inhibition. When sodium cyanate and sodium cyanurate are combined in a specific ratio, cyanate ions can first bind to specific sites on the surface of pyrite to exert an inhibitory effect, while cyanurate ions can bind to it from multiple dimensions with numerous active sites. The two work together to occupy various active sites on the surface of pyrite more comprehensively and efficiently, achieving a synergistic adsorption coverage effect, further strengthening the inhibitory effect on pyrite, and at the same time changing the surface chemical properties of pyrite, greatly reducing its floatability, thereby achieving an inhibitory effect on pyrite. Sodium carbonate has the function of regulating and dispersing the ore pulp. At the same time, it can eliminate the inevitable calcium and magnesium ions in the ore pulp, reduce the consumption of reagents due to the reaction with calcium and magnesium ions, and create favorable conditions for sodium cyanate and sodium cyanurate to better inhibit pyrite, thereby improving the effect of the entire combined inhibitor in practical applications. Through the compounding of the above components, the inhibitor has the characteristics of good selectivity and strong inhibition ability. A small amount of use in the roughing process can achieve a good inhibition effect. It can replace the lime inhibitor and overcome the various defects of lime as an inhibitor.

[0056] In some embodiments, the mass ratio of the sodium cyanate, the sodium cyanurate and the sodium carbonate is (6-7): (2-3): 1.

[0057] Optionally, the mass ratio of sodium cyanate, sodium cyanurate and sodium carbonate can be 6:2:1, 6.5:2:1, 7:2.5:1, 7:3:1, 7:2:1, 6.5:3:1 or any value between (6-7):(2-3):1.

[0058] It should be noted that when the mass ratio of sodium cyanate, sodium cyanurate and sodium carbonate is (6-7): (2-3): 1, the three inhibitors work synergistically at this ratio to effectively inhibit non-target minerals and improve the recovery rate and grade of target minerals. At the same time, by adjusting the ratio, selective inhibition of different minerals can be achieved and the flotation process can be optimized. This ratio setting not only reduces the amount of reagents used and saves costs, but also significantly improves the recovery rate and concentrate grade, improves flotation conditions, and increases production efficiency.

[0059] The second aspect of the present application provides a flotation method for copper sulfide ore, comprising:

[0060] Mixing copper sulfide ore and water to obtain ore slurry;

[0061] The ore pulp, the copper-sulfur separation combined inhibitor, the collector, and the frother are mixed to perform roughing to obtain a copper roughing concentrate;

[0062] The copper roughing concentrate and the copper-sulfur separation combination inhibitor are mixed and concentrated to obtain copper concentrate.

[0063] In some embodiments, the flotation method of the copper sulfide ore satisfies at least one of the following conditions:

[0064] A. The fineness of the copper sulfide ore is -0.074 mm, accounting for 55%-80%;

[0065] Optionally, the fineness of the copper sulfide ore -0.074 mm can account for 55%, 60%, 65%, 70%, 75%, 80% or any value between 55% and 80%;

[0066] B. The mass concentration of the slurry is 30%-45%.

[0067] Optionally, the mass concentration of the slurry may be 30%, 32%, 34%, 35%, 38%, 40%, 42%, 44%, 45% or any value between 30% and 45%.

[0068] In some embodiments, the flotation method of the copper sulfide ore satisfies at least one of the following conditions:

[0069] A. The collector includes one or more of ethiocarbamate, ester 105, sodium isobutyl black medicine, and ether aminothioester;

[0070] It should be noted that the collector can maintain a high collection efficiency and selectivity for copper under neutral or weakly alkaline conditions, and can selectively adsorb on the surface of copper minerals, while its adsorption capacity for sulfur minerals (such as pyrite and marcasite) is relatively weak, ensuring that the copper mineral particles are effectively floated during the flotation process to achieve copper-sulfur separation.

[0071] B. The foaming agent includes one or more of pine oil, No. 2 oil, and methyl isobutyl carbinol.

[0072] It should be noted that the foaming agent can quickly form a large number of tiny bubbles at the gas-liquid interface. These bubbles are evenly distributed and have good stability, which helps to effectively attach and separate mineral particles.

[0073] In some embodiments, the flotation method of the copper sulfide ore satisfies at least one of the following conditions:

[0074] A. The amount of the collector used in the roughing process is 30g / t-150g / t of raw ore;

[0075] Optionally, the amount of the collector used in the roughing process can be 30 g / t of raw ore, 60 g / t of raw ore, 90 g / t of raw ore, 120 g / t of raw ore, 150 g / t of raw ore, or any value between 30 g / t of raw ore and 150 g / t of raw ore;

[0076] B. The dosage of the foaming agent is 10g / t-50g / t of raw ore.

[0077] Optionally, the dosage of the foaming agent can be 10g / t of raw ore, 20g / t of raw ore, 30g / t of raw ore, 40g / t of raw ore, 50g / t of raw ore or any value between 10g / t of raw ore and 50g / t of raw ore.

[0078] In some embodiments, the flotation method of the copper sulfide ore satisfies at least one of the following conditions:

[0079] A. The dosage of the copper-sulfur separation combined inhibitor in the roughing process is 50 g / t-400 g / t of raw ore;

[0080] Optionally, the dosage of the copper-sulfur separation combined inhibitor in the roughing process can be 50 g / t of raw ore, 100 g / t of raw ore, 150 g / t of raw ore, 200 g / t of raw ore, 250 g / t of raw ore, 300 g / t of raw ore, 350 g / t of raw ore, 400 g / t of raw ore or any value between 50 g / t of raw ore and 400 g / t of raw ore;

[0081] It should be noted that during the roughing process, when the dosage of the copper-sulfur separation combined inhibitor is greater than 400g / t of original ore, the inhibitory capacity is too strong, which not only inhibits sulfur minerals, but also inhibits copper, and the copper recovery rate is reduced; when the dosage is less than 50g / t of original ore, the inhibitory capacity is insufficient and it is difficult to effectively inhibit sulfur minerals, resulting in excessive sulfur minerals in the copper concentrate and insufficient copper concentrate grade.

[0082] B. The dosage of the copper-sulfur separation combined inhibitor in the concentration process is 16 g / t to 120 g / t of raw ore;

[0083] Optionally, the dosage of the copper-sulfur separation combined inhibitor in the concentration process can be 16 g / t raw ore, 20 g / t raw ore, 30 g / t raw ore, 40 g / t raw ore, 50 g / t raw ore, 60 g / t raw ore, 70 g / t raw ore, 80 g / t raw ore, 90 g / t raw ore, 100 g / t raw ore, 110 g / t raw ore, 120 g / t raw ore or any value between 16 g / t raw ore and 120 g / t raw ore;

[0084] It should be noted that the dosage of the copper-sulfur separation combined inhibitor in the concentration process is 16g / t-120g / t of original ore. When the dosage is too large, the inhibitory ability is too strong, which not only inhibits sulfur minerals, but also inhibits copper, and the copper recovery rate is reduced; when the dosage is too small, the inhibitory ability is insufficient, and it is difficult to effectively inhibit sulfur minerals, resulting in excessive sulfur minerals in the copper concentrate and insufficient copper concentrate grade.

[0085] C. The number of times of selection is at least 3 times.

[0086] Optionally, the number of selections may be 3, 4, 5, 6, 10, or any value greater than or equal to 3.

[0087] In some embodiments, the selection includes a first selection, a second selection, and a third selection performed sequentially;

[0088] The amount of the copper-sulfur separation combined inhibitor used in the first concentration process is 10 g / t to 50 g / t of raw ore;

[0089] Optionally, the dosage of the copper-sulfur separation combined inhibitor in the first concentration process can be 10 g / t of raw ore, 20 g / t of raw ore, 30 g / t of raw ore, 40 g / t of raw ore, 50 g / t of raw ore, or any value between 10 g / t of raw ore and 50 g / t of raw ore;

[0090] The dosage of the copper-sulfur separation combined inhibitor in the second concentration process is 5 g / t-40 g / t of raw ore;

[0091] Optionally, the dosage of the copper-sulfur separation combined inhibitor in the second concentration process can be 5 g / t of raw ore, 10 g / t of raw ore, 20 g / t of raw ore, 30 g / t of raw ore, 40 g / t of raw ore, or any value between 5 g / t of raw ore and 40 g / t of raw ore;

[0092] The dosage of the copper-sulfur separation combination inhibitor in the third concentration process is 1 g / t-30 g / t of raw ore.

[0093] Optionally, the dosage of the copper-sulfur separation combination inhibitor in the third concentration process can be 1g / t raw ore, 2g / t raw ore, 3g / t raw ore, 4g / t raw ore, 5g / t raw ore, 6g / t raw ore, 7g / t raw ore, 8g / t raw ore, 9g / t raw ore, 10g / t raw ore, 12g / t raw ore, 15g / t raw ore, 18g / t raw ore, 21g / t raw ore, 24g / t raw ore, 27g / t raw ore, 30g / t raw ore or any value between 1g / t raw ore and 30g / t raw ore.

[0094] In some embodiments, the roughing further produces copper roughing tailings;

[0095] The copper roughing tailings and the collector are mixed and scavenged to obtain copper scavenged tailings;

[0096] The copper ore is returned to the upper level for separation.

[0097] In some embodiments, the flotation method of the copper sulfide ore satisfies at least one of the following conditions:

[0098] A. The number of scanning is at least 2 times;

[0099] Optionally, the number of scans may be 2, 3, 4, 5, 6, 10, or any value greater than or equal to 2;

[0100] B. The amount of the collector used in the scavenging process is 3g / t-30g / t of raw ore.

[0101] Optionally, the amount of collector used in the scavenging process can be 3g / t of raw ore, 5g / t of raw ore, 10g / t of raw ore, 15g / t of raw ore, 20g / t of raw ore, 25g / t of raw ore, 30g / t of raw ore or any value between 3g / t of raw ore and 30g / t of raw ore.

[0102] 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.

[0103] Example 1

[0104] In a first aspect, the present embodiment provides a copper-sulfur separation combined inhibitor, the raw materials of which include: sodium cyanate, sodium cyanurate and sodium carbonate;

[0105] Among them, the mass ratio of sodium cyanate, sodium cyanurate and sodium carbonate is 7:2:1.

[0106] The second aspect of the present embodiment provides a flotation method for copper sulfide ore, wherein a copper sulfide ore (Cu content is 0.71%, S content is 10.13%) is subjected to flotation separation, and a one-roughing, two-scavenging and three-fine process is adopted, wherein the intermediate ore obtained from the selection I and the scavenging I is returned to the roughing operation, the intermediate ore obtained from the selection II and the selection III is returned to the previous selection operation in sequence, and the intermediate ore obtained from the scavenging II is returned to the scavenging I. The process flow is as follows: Figure 1 As shown, the specific steps include:

[0107] S1: After grinding the sulfur copper ore to a fineness of -0.074 mm accounting for 65%, water is added to prepare a pulp, the mass concentration of the pulp is 36%, and the copper-sulfur separation combined inhibitor 200 g / t of the ore, the collector 60 g / t of the ore and the foaming agent 20 g / t of the ore are added to the pulp in sequence for a roughing process to obtain a foam product copper roughing concentrate and copper roughing tailings; wherein the collector is ethylthiocarbamate and the foaming agent is pine oil;

[0108] S2: Add collector to the copper rougher tailings for two scavenging operations. The dosage of collector ethiocarbamate in scavenging I and scavenging II is 10 g / t of raw ore and 5 g / t of raw ore respectively. The scavenged tailings I and scavenged tailings II obtained after scavenging are sequentially returned to the previous operation for separation;

[0109] S3: copper-sulfur separation combination inhibitor is added to the copper rougher concentrate for three concentration operations. The amount of copper-sulfur separation combination inhibitor in concentration I is 40g / t of original ore, the amount of copper-sulfur separation combination inhibitor in concentration II is 20g / t of original ore, and the amount of copper-sulfur separation combination inhibitor in concentration III is 5g / t of original ore. After the concentration is completed, a copper concentrate product is obtained.

[0110] Example 2

[0111] The difference between this embodiment and embodiment 1 is that the mass ratio of sodium cyanate, sodium cyanurate and sodium carbonate is 6:3:1.

[0112] Example 3

[0113] The difference between this embodiment and embodiment 1 is that the mass ratio of sodium cyanate, sodium cyanurate and sodium carbonate is 5:3:1.

[0114] Example 4

[0115] The difference between this embodiment and embodiment 1 is that the mass ratio of sodium cyanate, sodium cyanurate and sodium carbonate is 6.5:2.5:1.

[0116] Example 5

[0117] The difference between this embodiment and embodiment 1 is that the mass ratio of sodium cyanate, sodium cyanurate and sodium carbonate is 6.5:3:1.

[0118] Example 6

[0119] The difference between this embodiment and embodiment 1 is that the mass ratio of sodium cyanate, sodium cyanurate and sodium carbonate is 7:2.5:1.

[0120] Comparative Example 1

[0121] The difference between this comparative example and Example 1 is that the mass ratio of sodium cyanate, sodium cyanurate and sodium carbonate is 3:1:1.

[0122] Comparative Example 2

[0123] The difference between this comparative example and Example 1 is that the mass ratio of sodium cyanate, sodium cyanurate and sodium carbonate is 4:2:1.

[0124] Comparative Example 3

[0125] The difference between this comparative example and Example 1 is that sodium carbonate is not added to the copper-sulfur separation combined inhibitor in this comparative example.

[0126] Comparative Example 4

[0127] The difference between this comparative example and Example 1 is that the copper-sulfur separation combined inhibitor in this comparative example does not add sodium cyanate.

[0128] Comparative Example 5

[0129] The difference between this comparative example and Example 1 is that the copper-sulfur separation combined inhibitor of this comparative example does not add sodium cyanurate.

[0130] Comparative Example 6

[0131] The difference between this comparative example and Example 1 is that when flotation of copper sulfide ore is carried out in this comparative example, the inhibitor used is lime, the amount of lime used in the roughing selection is 3000 g / t of raw ore, the amount of lime used in the three concentration operations in the concentration I is 600 g / t of raw ore, the amount of lime used in the concentration II is 300 g / t of raw ore, and the amount of lime used in the concentration III is 100 g / t of raw ore.

[0132] Comparative Example 7

[0133] The difference between this comparative example and Example 1 is that the dosage of the copper-sulfur separation combination inhibitor during roughing in this comparative example is 600 g / t of raw ore.

[0134] Comparative Example 8

[0135] The difference between this comparative example and Example 1 is that the dosage of the copper-sulfur separation combination inhibitor during the concentration in this comparative example is 150 g / t of original ore.

[0136] The product properties of the copper concentrates produced in the above examples and comparative examples were tested, and the specific results are shown in Table 1.

[0137] Table 1 Copper concentrate performance test

[0138]

[0139] It can be seen from the data in Table 1 that the recovery rates of the copper concentrates produced in Examples 1-6 are all relatively high, 1% higher in grade and 2-3% higher in recovery than those produced by conventional use of lime inhibitors. They can replace lime and achieve efficient separation of copper and sulfur from copper-sulfur ore. The copper-sulfur separation combination inhibitor dosage provided in the present application is greatly reduced, which is more efficient and environmentally friendly.

[0140] 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.

[0141] 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 flotation method for copper sulfide ore, characterized in that: include: Mixing copper sulfide ore and water to obtain ore slurry; The ore pulp, the copper-sulfur separation combined inhibitor, the collector, and the frother are mixed to perform roughing to obtain a copper roughing concentrate; The copper rougher concentrate and the copper-sulfur separation combined inhibitor are mixed and concentrated to obtain a copper concentrate; The copper-sulfur separation combined inhibitor is prepared by compounding sodium cyanate, sodium cyanurate and sodium carbonate; The mass ratio of the sodium cyanate, the sodium cyanurate and the sodium carbonate is (5-7): (1-3): 1; The fineness of the copper sulfide ore is -0.074 mm, accounting for 55%-80%; The mass concentration of the slurry is 30%-45%; The collector includes one or more of ethiocarbamate, ester 105, sodium isobutyl black medicine, and ether aminothioester; The foaming agent includes one or more of pine oil, No. 2 oil, and methyl isobutyl carbinol; The amount of the collector used in the roughing process is 30g / t-150g / t of raw ore; The dosage of the foaming agent is 10g / t-50g / t of raw ore; The amount of the copper-sulfur separation combined inhibitor used in the roughing process is 50 g / t-400 g / t of raw ore; The amount of the copper-sulfur separation combined inhibitor used in the concentration process is 16 / t raw ore-120g / t raw ore; The number of times of selection is at least 3 times; The selection includes a first selection, a second selection, and a third selection performed in sequence; The amount of the copper-sulfur separation combined inhibitor used in the first concentration process is 10 g / t to 50 g / t of raw ore; The dosage of the copper-sulfur separation combined inhibitor in the second concentration process is 5 g / t-40 g / t of raw ore; The dosage of the copper-sulfur separation combination inhibitor in the third concentration process is 1 g / t-30 g / t of raw ore.

2. The flotation method of copper sulfide ore according to claim 1, characterized in that: The mass ratio of the sodium cyanate, the sodium cyanurate and the sodium carbonate is (6-7): (2-3):

1.

3. The flotation method of copper sulfide ore according to claim 1 or 2, characterized in that: The roughing also produces copper roughing tailings; The copper roughing tailings and the collector are mixed and scavenged to obtain copper scavenged tailings; The copper ore is returned to the upper level for separation.

4. The flotation method of copper sulfide ore according to claim 3, characterized in that: At least one of the following conditions is met: A. The number of scanning is at least 2 times; B. The amount of the collector used in the scavenging process is 3g / t-30g / t of raw ore.

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