Application of sodium 2, 3-dimercaptopropanesulfonate as inhibitor in low-alkalinity copper-sulfur flotation separation

Abstract

The invention provides application of sodium 2, 3-dimercaptopropanesulfonate as an inhibitor in low-alkalinity copper-sulfur flotation separation, and relates to the technical field of mineral separation. When the compound serves as an inhibitor, the compound, a collecting agent and a foaming agent are prepared into a composite flotation reagent and used for low-alkalinity flotation separation of chalcopyrite and pyrite, flotation separation is conducted through the steps of one-time roughing, at least one-time scavenging and at least one-time concentration after ore grinding and grading, and copper concentrate is collected; the method can effectively solve the problems that the copper-iron separation effect is poor in the process of flotation separation of the chalcopyrite and the pyrite, the copper recovery rate is low due to addition of a large amount of lime and the like, the chalcopyrite and the pyrite can be efficiently separated under the low-alkalinity condition through the specific flotation process, and the flotation effect on the chalcopyrite is improved.

Description

Technical Field

[0001] The present invention relates to the field of mineral flotation, and more specifically, to the application of sodium 2,3-dimercaptopropanesulfonate as an inhibitor in the low-alkalinity flotation separation of copper and sulfur. Background Art

[0002] Copper is one of the most important metals in the world. Due to its good ductility, thermal conductivity and electrical conductivity, it is widely used in many industrial fields such as manufacturing, construction, and national defense. With the continuous development of the economy, the demand for copper is also increasing day by day. With the rapid development of high-quality copper resources, the recovery of low-grade and refractory copper resources has attracted increasing attention. 90% of the primary copper in the world comes from copper sulfide ores, which are usually associated with pyrite, increasing the difficulty of obtaining high-quality copper concentrates. If pyrite cannot be effectively separated, a large amount of acidic wastewater will be generated during the subsequent smelting process, polluting the environment. Therefore, how to achieve efficient separation of chalcopyrite and pyrite remains a research hotspot.

[0003] Currently, chalcopyrite and pyrite are usually separated by flotation, and the main difficulties in their flotation separation are as follows: (1) After chalcopyrite is dissociated, the copper ions dissolved on its surface into the pulp are likely to activate pyrite, resulting in a significant increase in the floatability of pyrite; (2) A large amount of lime is added in the conventional copper-sulfur separation. While inhibiting the floating of pyrite under high-alkalinity conditions, it will also affect chalcopyrite, resulting in a decrease in the recovery rate of copper. In addition, the large addition of lime makes a large amount of calcium ions exist in the flotation pulp, easily causing scaling of equipment or pipelines, reducing production efficiency. Moreover, when recovering pyrite from high-alkalinity copper tailings by flotation, a large amount of sulfuric acid needs to be added for activation, increasing the reagent cost and posing a safety risk. Summary of the Invention

[0004] Based on the above technical problems existing in the prior art, the present invention provides the application of sodium 2,3-dimercaptopropanesulfonate in the flotation separation of chalcopyrite and pyrite. This compound can act as an inhibitor on the surface of pyrite, effectively reducing the floatability of pyrite under low-alkalinity conditions, efficiently and selectively separating chalcopyrite and pyrite, and effectively reducing the alkalinity of copper-sulfur flotation separation. At the same time, it greatly reduces the dosage of the activator sulfuric acid in the subsequent pyrite recovery process and reduces the environmental pollution risk.

[0005] In order to achieve the above object, the technical solution of the present invention is as follows:

[0006] The application of sodium 2,3-dimercaptopropanesulfonate as an inhibitor in the low-alkalinity flotation separation of copper and sulfur.

[0007] The present invention also provides the application of sodium 2,3-dimercaptopropanesulfonate as an inhibitor in the flotation separation of chalcopyrite and pyrite.

[0008] The present invention also provides a composite flotation reagent for the flotation separation of chalcopyrite and pyrite. The composite flotation reagent includes an inhibitor, a collector, and a frother; the inhibitor is sodium 2,3-dimercaptopropanesulfonate.

[0009] In some embodiments, the collector includes at least one of O-isopropyl-N-ethyl thionocarbamate, allyl isobutyl xanthate, and sodium diisobutyl dithiophosphite.

[0010] In some embodiments, the frother includes pine oil and / or methyl isobutyl carbinol.

[0011] The present invention also provides a method for the flotation separation of chalcopyrite and pyrite. The method uses the above composite flotation reagent for flotation, and specifically includes the following steps:

[0012] S1. Grinding and classifying the mixed ore containing chalcopyrite and pyrite to obtain pulp.

[0013] S2. Adding the regulator lime to the pulp, adjusting the pH of the pulp to 8-9, and then performing flotation to obtain copper concentrate.

[0014] The flotation process includes one roughing, at least one cleaning, and at least one scavenging.

[0015] In some embodiments, the flotation process includes the following steps:

[0016] 1) The roughing process includes: adding an inhibitor, a collector, and a frother to the pulp, and performing flotation to obtain roughing concentrate and roughing tailings.

[0017] 2) The scavenging process includes: adding the collector and the frother to the pulp of the roughing tailings, and performing flotation to obtain scavenging concentrate and scavenging tailings.

[0018] 3) The cleaning process includes: adding an inhibitor to the pulp of the roughing concentrate, and performing flotation to obtain cleaning concentrate and cleaning tailings.

[0019] In some embodiments, the flotation process includes one roughing, two scavengings, and two cleanings.

[0020] In some embodiments, in the roughing process, based on the mass of the pulp, the dosage of the collector is 50-200 g / t, the dosage of the inhibitor is 100 g / t - 1000 g / t, and the dosage of the frother is 10 g / t - 50 g / t.

[0021] In some embodiments, in each scavenging process, based on the mass of the pulp, the dosage of the collector is 20-100 g / t, and the dosage of the frother is 5-40 g / t.

[0022] In some embodiments, during each beneficiation process, based on the mass of the pulp, the dosage of the inhibitor is 100 - 500 g / t.

[0023] In some embodiments, during roughing and scavenging, the collector is added to the pulp in the form of an aqueous solution, and the mass concentration of the aqueous solution is 1 - 10%; preferably, it is 2 - 5%.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] The present invention provides the application of sodium 2,3 - dimercaptopropanesulfonate as an inhibitor in low - alkalinity copper - sulfur flotation, especially in the application of separating chalcopyrite and pyrite by low - alkalinity flotation. This compound can act on the surface of pyrite to prevent the collector from acting on the surface of pyrite, effectively reduce the floatability of pyrite under low - alkali conditions, improve the selectivity of the collector for chalcopyrite, efficiently separate chalcopyrite and pyrite, and thus improve the recovery efficiency of chalcopyrite. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is the flow chart of the flotation process of the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] Many specific details are set forth in the following description in order to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0029] The first aspect of the present invention is to provide the application of sodium 2,3 - dimercaptopropanesulfonate as an inhibitor in low - alkalinity copper - sulfur flotation.

[0030] The second aspect of the present invention is to provide the application of sodium 2,3 - dimercaptopropanesulfonate as an inhibitor in the low - alkalinity flotation separation of chalcopyrite and pyrite.

[0031] The third aspect of the present invention is to provide a composite flotation reagent for the low - alkalinity flotation separation of chalcopyrite and pyrite. The composite flotation reagent includes an inhibitor, a collector, and a frother; the inhibitor is sodium 2,3 - dimercaptopropanesulfonate.

[0032] As a preferred embodiment, the collector includes at least one of O-isopropyl-N-ethyl thionocarbamate, allyl isobutyl xanthate, and sodium diisobutyl dithiophosphite.

[0033] As a preferred embodiment, the frother includes terpineol and / or methyl isobutyl carbinol.

[0034] The fourth aspect of the present invention lies in providing a method for flotation separation of chalcopyrite and pyrite. This method uses the composite flotation reagent provided in the above-mentioned third aspect for flotation, and specifically includes the following steps:

[0035] S1. Grind and classify the mixed ore containing chalcopyrite and pyrite to obtain pulp.

[0036] S2. Add the regulator lime to the pulp, adjust the pH of the pulp to 8 - 9, and then perform flotation to obtain copper concentrate.

[0037] The flotation process includes one roughing, at least one scavenging, and at least one cleaning.

[0038] Specifically, the flotation process includes the following steps:

[0039] 1) The roughing process includes: adding an inhibitor, a collector, and a frother to the pulp, and performing flotation to obtain roughing concentrate and roughing tailings.

[0040] 2) The scavenging process includes: adding the collector and the frother to the pulp of the roughing tailings, and performing flotation to obtain scavenging concentrate and scavenging tailings.

[0041] 3) The cleaning process includes: adding an inhibitor to the pulp of the roughing concentrate, and performing flotation to obtain cleaning concentrate and cleaning tailings.

[0042] It can be understood that the roughing, scavenging, and cleaning involved in this step S2 refer to one flotation operation. It should be noted that "at least one scavenging" means that one scavenging, two scavengings, or more than three scavengings can be performed according to the actual needs of flotation; "at least one cleaning" means that one cleaning, two cleanings, or more than three cleanings can be performed according to the actual needs of flotation.

[0043] As a preferred embodiment, the present invention adopts one rough selection, two scavenging selections and two cleaning selections, that is, a total of five flotation steps are carried out in the present invention; and the tailing pulp obtained during the rough selection process is used as the pulp raw material for the first scavenging selection, and the tailing pulp obtained from the pre-scavenging selection is used as the pulp raw material for the post-scavenging selection. The concentrate pulp in the scavenging selection is returned to the previous stage, and the concentrate pulp in the post-scavenging selection is returned to the previous stage; similarly, during the rough selection process, the obtained concentrate pulp is used as the pulp raw material for the first cleaning selection, and the concentrate pulp obtained from the pre-cleaning selection is used as the pulp raw material for the post-cleaning selection. The tailing pulp in the cleaning selection is returned to the previous stage.

[0044] In each flotation operation of the present invention, there should be corresponding stirring and aeration methods. The present invention can adopt any conventional or unconventional methods, such as mechanical impeller stirring, rotor stirring, gas precipitation type or pressure dissolved air type, etc. Any re-election parameters or types can achieve the mineral separation of the present invention, and the present invention does not limit this.

[0045] As a preferred embodiment, the pH adjuster in the present invention is lime; lime not only plays the role of adjusting the pH of the pulp, but also plays the role of inhibiting the floating of pyrite, preventing the reduction of the flotation separation effect during the separation and cleaning of copper in this step.

[0046] As a preferred embodiment, during the rough selection and scavenging selection processes, the collector is added in the form of an aqueous solution, and the mass concentration of the aqueous solution is 1-10%; as a more preferred embodiment, the mass concentration of the aqueous solution of the collector is 2-5%.

[0047] As a preferred embodiment, during the rough selection process, based on the mass of the pulp, the dosage of the inhibitor is 100 g / t - 1000 g / t, the dosage of the collector is 50 - 200 g / t, and the dosage of the frother is 10 g / t - 50 g / t.

[0048] As a preferred embodiment, during the rough selection process, based on the mass of the pulp, the dosage of the inhibitor includes but is not limited to any one of 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000 (g / t) or any numerical range composed of any two of them; the dosage of the collector includes but is not limited to any one of 50, 60, 80, 100, 120, 160, 180, 200 (g / t) or any numerical range composed of any two of them; the dosage of the frother includes any one of 10, 15, 20, 25, 30, 35, 40, 45, 50 (g / t) or any numerical range composed of any two of them.

[0049] As a preferred embodiment, each scavenging selection includes adding a collector and a frother to the tailing pulp after rough selection or scavenging selection, and performing flotation to obtain scavenging tailings and scavenging concentrate.

[0050] As a preferred embodiment, during each scavenging process, based on the mass of the pulp, the dosage of the collector is 20 - 100 g / t. Specifically, it includes, but is not limited to, any one or any numerical range composed of any two of 20, 30, 40, 50, 60, 70, 80, 90, 100 (g / t); the dosage of the frother is 5 - 40 g / t. Specifically, it includes, but is not limited to, any one or any numerical range composed of any two of 5, 10, 15, 20, 25, 30, 35, 40 (g / t).

[0051] As a preferred embodiment, each cleaning includes: adding an inhibitor to the concentrated pulp after roughing or cleaning, and performing flotation to obtain the cleaned tailings and the cleaned concentrate.

[0052] As a preferred embodiment, during each cleaning process, based on the mass of the pulp, the dosage of the inhibitor is 100 - 500 g / t. Specifically, it includes, but is not limited to, any one or any numerical range composed of any two of 100, 150, 200, 250, 300, 350, 400, 450, 500 (g / t).

[0053] As a more preferred embodiment, the above-mentioned one roughing, two scavengings and two cleanings of the present invention include the following steps:

[0054] (1) Adding an inhibitor, a collector and a frother in the composite flotation reagent to the pulp after adjusting the pH, and performing roughing to obtain the roughing tailings and the roughing concentrate;

[0055] (2) Adding a collector and a frother in the composite flotation reagent to the pulp of the roughing tailings, and performing the first scavenging to obtain the first scavenging tailings and the first scavenging concentrate; wherein, the first scavenging concentrate is returned to the pulp of the roughing for re-roughing;

[0056] (3) Adding a collector and a frother in the composite flotation reagent to the first scavenging tailings, and performing the second scavenging to obtain the second scavenging tailings and the second scavenging concentrate; wherein, the second scavenging concentrate is returned to the pulp of the first scavenging for re-scavenging; the second scavenging tailings are used as the final tailings product of the flotation separation of the present invention;

[0057] (4) Adding an inhibitor in the composite flotation reagent to the pulp of the roughing concentrate, and performing the first cleaning to obtain the first cleaning concentrate and the first cleaning tailings; wherein, the first cleaning tailings are returned to the pulp of the roughing for re-roughing;

[0058] (5) Add an inhibitor in the composite flotation reagent to the first-stage concentrated concentrate for second-stage concentration to obtain a second-stage concentrated concentrate and second-stage concentrated tailings; wherein, the second-stage concentrated tailings are returned to the pulp in the first-stage concentration for re-concentration; the second-stage concentrated concentrate is used as the final concentrated concentrate product of the flotation separation of the present invention, i.e., copper concentrate.

[0059] The ore samples used in the following examples and comparative examples of the present invention are copper-sulfur ore from a certain mine in Guangdong. The main useful mineral components of the ore are chalcopyrite and pyrite, and the gangue minerals are mainly quartz, etc. The grades of the main valuable metal elements copper and sulfur in the ore are 0.43% and 15.85% respectively.

[0060] Example 1

[0061] As Figure 1 shown, a method for flotation separation of chalcopyrite and pyrite with low alkalinity includes the following steps:

[0062] S1. Feed the raw ore and part of lime into the grinding and classification operation. After grinding to a fineness of -0.074mm particle size accounting for 75%, convey the pulp to the flotation machine and adjust the pulp concentration to 35% by adding water; add lime to the pulp to adjust the pulp pH to 8.5, and perform one-stage rough selection, two-stage concentration and two-stage scavenging operations;

[0063] S2-1. Rough selection: Add an inhibitor 2,3-dimercaptopropanesulfonic acid sodium salt, a collector isobutyl xanthate acrylate and a foaming agent terpineol to the pulp for flotation to obtain a rough concentrate and rough tailings; wherein, based on the mass of the pulp, the dosage of the inhibitor is 800g / t, the dosage of the collector is 100g / t, and the dosage of the foaming agent is 30g / t;

[0064] S2-2. First scavenging: Add a collector isobutyl xanthate acrylate and a foaming agent terpineol to the pulp of the rough tailings for first scavenging to obtain a first scavenged concentrate and first scavenged tailings; the first scavenged concentrate is returned to the pulp in the rough selection for re-rough selection; wherein, based on the mass of the pulp, the dosage of the collector is 50g / t, and the dosage of the foaming agent is 20g / t;

[0065] S2-3. Add a collector isobutyl xanthate acrylate and a foaming agent terpineol to the pulp of the first scavenged tailings for second scavenging to obtain a second scavenged concentrate and second scavenged tailings; the second scavenged concentrate is returned to the pulp in the first scavenging for re-scavenging, and the second scavenged tailings are used as the final tailings product of this example; wherein, based on the mass of the pulp, the dosage of the collector is 30g / t, and the dosage of the foaming agent is 10g / t;

[0066] S2-4, First Concentration: Sodium 2,3-dimercaptopropanesulfonate as an inhibitor is added to the rougher concentrate for first concentration to obtain the first-concentrated concentrate and the first-concentrated tailings; the first-concentrated tailings are returned to the pulp in the rougher for re-roughering; among them, based on the mass of the pulp, the dosage of the inhibitor is 400 g / t;

[0067] S2-5, Second Concentration: Sodium 2,3-dimercaptopropanesulfonate as an inhibitor is added to the first-concentrated concentrate for second concentration to obtain the second-concentrated concentrate and the second-concentrated tailings; the second-concentrated tailings are returned to the pulp in the first concentration for re-concentration, and the second-concentrated tailings are used as the copper concentrate product in this example; among them, the dosage of the inhibitor is 100 g / t.

[0068] After detection, the copper content in the copper concentrate obtained in this example is 18.13%, and the copper recovery rate is 88.62%.

[0069] Example 2

[0070] As Figure 1 shown, a method for low-alkalinity flotation separation of chalcopyrite and pyrite includes the following steps:

[0071] S1. Feed the raw ore and part of the lime into the grinding and classification operation. After grinding to a fineness where the -0.074 mm particle size fraction accounts for 80%, the pulp is transported to the flotation machine and water is added to adjust the pulp concentration to 30%; Lime is added to the pulp to adjust the pulp pH to 9, and one rougher, two cleaners, and two scavengers are carried out;

[0072] S2-1, Rougher: Sodium 2,3-dimercaptopropanesulfonate as an inhibitor, diisobutyl dithiophosphinate as a collector, and terpineol as a frother are added to the pulp for flotation to obtain the rougher concentrate and the rougher tailings; among them, based on the mass of the pulp, the dosage of the inhibitor is 700 g / t, the dosage of the collector is 80 g / t, and the dosage of the frother is 30 g / t;

[0073] S2-2, First Scavenger: Diisobutyl dithiophosphinate as a collector and terpineol as a frother are added to the pulp of the rougher tailings for first scavenging to obtain the first-scavenged concentrate and the first-scavenged tailings; the first-scavenged concentrate is returned to the pulp in the rougher for re-roughering; among them, based on the mass of the pulp, the dosage of the collector is 30 g / t, and the dosage of the frother is 20 g / t;

[0074] S2-3, Add diisobutyl dithiophosphinate as a collector and terpineol as a frother to the pulp of the first-scavenged tailings for second scavenging to obtain the second-scavenged concentrate and the second-scavenged tailings; the second-scavenged concentrate is returned to the pulp in the first scavenging for re-scavenging, and the second-scavenged tailings are used as the final tailings product in this example; among them, based on the mass of the pulp, the dosage of the collector is 20 g / t, and the dosage of the frother is 10 g / t;

[0075] S2-4, First cleaning: Sodium 2,3-dimercaptopropanesulfonate as inhibitor was added to the rougher concentrate for first cleaning to obtain first-cleaning concentrate and first-cleaning tailings; the first-cleaning tailings were returned to the pulp of the rougher for re-roughering; among them, based on the mass of the pulp, the dosage of the inhibitor was 350 g / t;

[0076] S2-5, Second cleaning: Sodium 2,3-dimercaptopropanesulfonate as inhibitor was added to the first-cleaning concentrate for second cleaning to obtain second-cleaning concentrate and second-cleaning tailings; the second-cleaning tailings were returned to the pulp of the first cleaning for re-cleaning, and the second-cleaning tailings were used as the copper concentrate product of this example; among them, the dosage of the inhibitor was 100 g / t.

[0077] After detection, the copper content in the copper concentrate obtained in this example was 18.02%, and the copper recovery rate was 89.17%.

[0078] Example 3

[0079] As Figure 1 shown, a method for low-alkalinity flotation separation of chalcopyrite and pyrite includes the following steps:

[0080] S1. The raw ore and part of lime were fed into the grinding and classification operation. After grinding to a fineness where the -0.074 mm particle size fraction accounted for 75%, the pulp was transported to the flotation machine and water was added to adjust the pulp concentration to 20%; lime was added to the pulp to adjust the pulp pH to 8, and one rougher, two cleaners, and two scavengers were carried out;

[0081] S2-1, Rougher: Sodium 2,3-dimercaptopropanesulfonate as inhibitor, O-isopropyl-N-ethylthionocarbamate as collector, and terpineol as frother were added to the pulp for flotation to obtain rougher concentrate and rougher tailings; among them, based on the mass of the pulp, the dosage of the inhibitor was 900 g / t, the dosage of the collector was 60 g / t, and the dosage of the frother was 20 g / t;

[0082] S2-2, First scavenger: O-isopropyl-N-ethylthionocarbamate as collector and terpineol as frother were added to the pulp of the rougher tailings for first scavenging to obtain first-scavenging concentrate and first-scavenging tailings; the first-scavenging concentrate was returned to the pulp of the rougher for re-roughering; among them, based on the mass of the pulp, the dosage of the collector was 20 g / t, and the dosage of the frother was 10 g / t;

[0083] S2-3. Add collector O-isopropyl-N-ethyl thionocarbamate and foaming agent terpineol to the pulp of the first scavenging tailings for secondary scavenging to obtain secondary scavenging concentrate and secondary scavenging tailings; the secondary scavenging concentrate is returned to the pulp of the first scavenging for re-scavenging, and the secondary scavenging tailings are used as the final tailings product of this embodiment; among them, based on the mass of the pulp, the dosage of the collector is 20 g / t, and the dosage of the foaming agent is 10 g / t;

[0084] S2-4. First cleaning: Add inhibitor sodium 2,3-dimercaptopropanesulfonate to the roughing concentrate for first cleaning to obtain first cleaning concentrate and first cleaning tailings; the first cleaning tailings are returned to the pulp of the roughing for re-roughing; among them, based on the mass of the pulp, the dosage of the inhibitor is 500 g / t;

[0085] S2-5. Second cleaning: Add inhibitor sodium 2,3-dimercaptopropanesulfonate to the first cleaning concentrate for second cleaning to obtain second cleaning concentrate and second cleaning tailings; the second cleaning tailings are returned to the pulp of the first cleaning for re-cleaning, and the second cleaning tailings are used as the copper concentrate product of this embodiment; among them, the dosage of the inhibitor is 100 g / t.

[0086] After detection, the copper content in the copper concentrate obtained in this embodiment is 18.68%, and the copper recovery rate is 86.63%.

[0087] Comparative Example 1

[0088] A method for low-alkalinity flotation separation of chalcopyrite and pyrite, comprising the following steps:

[0089] S1. Feed the raw ore and part of the lime into the grinding and classification operation. After grinding to a fineness of -0.074 mm particle size accounting for 75%, convey the pulp to the flotation machine and adjust the pulp concentration to 20% by adding water; add lime to the pulp to adjust the pulp pH to 8, and perform one roughing, two cleanings and two scavengings;

[0090] S2-1. Roughing: Add inhibitor mercaptoacetic acid, collector O-isopropyl-N-ethyl thionocarbamate and foaming agent terpineol to the pulp for flotation to obtain roughing concentrate and roughing tailings; among them, based on the mass of the pulp, the dosage of the inhibitor is 900 g / t, the dosage of the collector is 60 g / t, and the dosage of the foaming agent is 20 g / t;

[0091] S2-2. First scavenging: Add collector O-isopropyl-N-ethyl thionocarbamate and foaming agent terpineol to the pulp of the roughing tailings for first scavenging to obtain first scavenging concentrate and first scavenging tailings; the first scavenging concentrate is returned to the pulp of the roughing for re-roughing; among them, based on the mass of the pulp, the dosage of the collector is 20 g / t, and the dosage of the foaming agent is 10 g / t;

[0092] S2-3. Add collector O-isopropyl-N-ethyl thionocarbamate and foaming agent terpineol to the pulp of the first scavenging tailings for secondary scavenging to obtain secondary scavenging concentrate and secondary scavenging tailings; the secondary scavenging concentrate is returned to the pulp of the first scavenging for re-scavenging, and the secondary scavenging tailings are used as the final tailings product of this embodiment; wherein, based on the mass of the pulp, the dosage of the collector is 20 g / t, and the dosage of the foaming agent is 10 g / t;

[0093] S2-4. First cleaning: Add inhibitor mercaptoacetic acid to the roughing concentrate for first cleaning to obtain first cleaning concentrate and first cleaning tailings; the first cleaning tailings are returned to the pulp of the roughing for re-roughing; wherein, based on the mass of the pulp, the dosage of the inhibitor is 500 g / t;

[0094] S2-5. Second cleaning: Add inhibitor mercaptoacetic acid to the first cleaning concentrate for second cleaning to obtain second cleaning concentrate and second cleaning tailings; the second cleaning tailings are returned to the pulp of the first cleaning for re-cleaning, and the second cleaning tailings are used as the copper concentrate product of this embodiment; wherein, the dosage of the inhibitor is 100 g / t.

[0095] After testing, the copper content in the copper concentrate obtained in this embodiment is 16.87%, and the copper recovery rate is 82.16%.

[0096] Comparative Example 2

[0097] A method for flotation separation of chalcopyrite and pyrite, comprising the following steps:

[0098] S1. Feed the raw ore and part of the lime into the grinding and classification operation. After grinding to a fineness of -0.074 mm particle size accounting for 75%, convey the pulp to the flotation machine and adjust the pulp concentration to 20% by adding water; add lime to the pulp to adjust the pulp pH to 12, and perform one roughing, two cleanings and two scavengings;

[0099] S2-1. Roughing: Add collector O-isopropyl-N-ethyl thionocarbamate and foaming agent terpineol to the pulp for flotation to obtain roughing concentrate and roughing tailings; wherein, based on the mass of the pulp, the dosage of the collector is 900 g / t, and the dosage of the foaming agent is 20 g / t;

[0100] S2-2. First scavenging: Add collector O-isopropyl-N-ethyl thionocarbamate and foaming agent terpineol to the pulp of the roughing tailings for first scavenging to obtain first scavenging concentrate and first scavenging tailings; the first scavenging concentrate is returned to the pulp of the roughing for re-roughing; wherein, based on the mass of the pulp, the dosage of the collector is 20 g / t, and the dosage of the foaming agent is 10 g / t;

[0101] S2-3. Add the collector tert-butyl xanthate acrylate and the foaming agent terpineol to the pulp of the first scavenging tailings for secondary scavenging to obtain secondary scavenging concentrate and secondary scavenging tailings. The secondary scavenging concentrate is returned to the pulp of the first scavenging for re-scavenging, and the secondary scavenging tailings are used as the final tailings product of this embodiment. Among them, based on the mass of the pulp, the dosage of the collector is 20 g / t, and the dosage of the foaming agent is 10 g / t.

[0102] S2-4. First cleaning: Add the inhibitor lime to the roughing concentrate for first cleaning to obtain first cleaning concentrate and first cleaning tailings. The first cleaning tailings are returned to the pulp of the roughing for re-roughing. Among them, based on the mass of the pulp, the dosage of the inhibitor is 500 g / t.

[0103] S2-5. Second cleaning: Add the inhibitor lime to the first cleaning concentrate for second cleaning to obtain second cleaning concentrate and second cleaning tailings. The second cleaning tailings are returned to the pulp of the first cleaning for re-cleaning, and the second cleaning tailings are used as the copper concentrate product of this embodiment. Among them, the dosage of the inhibitor is 100 g / t.

[0104] After testing, the copper content in the copper concentrate obtained in this embodiment is 17.52%, and the copper recovery rate is 80.21%.

[0105] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0106] The above-described embodiments only represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. Application of sodium 2,3-dimercaptopropane sulfonate as an inhibitor in low-alkalinity copper-sulfur flotation separation.

2. Application of sodium 2,3-dimercaptopropane sulfonate as a depressant in the flotation separation of chalcopyrite and pyrite.

3. A composite flotation agent for low alkalinity flotation separation of chalcopyrite and pyrite, characterized in that: The invention comprises an inhibitor, a collector and a foaming agent; the inhibitor is sodium 2,3-dimercaptopropane sulfonate.

4. The composite flotation agent for low-alkalinity flotation separation of chalcopyrite and pyrite according to claim 3, characterized in that: The collector includes at least one of O-isopropyl-N-ethylthiocarbamate, isobutyl propylene xanthate, and diisobutyl sodium dithiophosphite; and the foaming agent includes pine oil and / or methyl isobutyl carbinol.

5. A method for flotation separation of chalcopyrite and pyrite, characterized in that: The flotation is carried out using the composite flotation reagent according to claim 3 or 4, specifically comprising the following steps: S1, grinding and classifying the mixed ore containing chalcopyrite and pyrite to obtain ore pulp; S2, adding lime as an adjusting agent to the slurry, adjusting the pH of the slurry to 8-9, and then flotation to obtain copper concentrate; The flotation process includes one roughing process, at least one scavenging process and at least one cleaning process.

6. The method for flotation separation of chalcopyrite and pyrite according to claim 5, characterized in that: The flotation process comprises the following steps: 1) The roughing process includes: adding an inhibitor, a collector and a frother to the ore pulp, performing flotation, and obtaining a roughing concentrate and a roughing tailing; 2) The scavenging process includes: adding the collector and the frother to the pulp of the rougher tailings, performing flotation, and obtaining scavenging concentrate and scavenging tailings; 3) The concentration process includes: adding a depressant to the pulp of the rougher concentrate, performing flotation, and obtaining a concentrated concentrate and a concentrated tailings.

7. The method for flotation separation of chalcopyrite and pyrite according to claim 6, characterized in that: The flotation process includes one roughing process, two sweeping processes and two cleaning processes.

8. The method for flotation separation of chalcopyrite and pyrite according to claim 7, characterized in that: In the roughing process, based on the mass of the ore pulp, the amount of the inhibitor is 100g / t-1000g / t, the amount of the collector is 50-200g / t, and the amount of the frother is 10g / t-50g / t; and / or, in each sweeping process, based on the mass of the ore pulp, the amount of the collector is 20-100g / t, and the amount of the frother is 5-40g / t; and / or, in each concentrating process, based on the mass of the ore pulp, the amount of the inhibitor is 100-500g / t.

9. The method for flotation separation of chalcopyrite and pyrite according to any one of claims 5 to 8, characterized in that: During the roughing and scavenging processes, the collector is added to the ore pulp in the form of an aqueous solution, and the mass concentration of the aqueous solution is 1-10%.

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