A method for realizing copper-molybdenum flotation separation based on potential regulation and multi-element inhibition cooperation

Abstract

The application discloses a method for realizing copper-molybdenum flotation separation based on potential regulation and multi-element inhibition synergy, and belongs to the technical field of ore dressing. The method comprises the following steps: performing slurry conditioning on a copper-molybdenum mixed concentrate to obtain a slurry, adding flotation reagents containing a copper ore inhibitor and a molybdenum ore collector into the slurry to perform flotation separation, and obtaining a molybdenum concentrate; the copper ore inhibitor comprises mercaptoacetic acid, sodium bis-carboxymethyltrithiocarbonate and sodium alginate. The method is based on the use of a composite inhibitor composed of mercaptoacetic acid, sodium bis-carboxymethyltrithiocarbonate and sodium alginate, can utilize physical combination and chemical adsorption to strengthen the inhibition effect on copper ore through the synergistic effect of flotation potential regulation and multi-element inhibition, improve the copper-molybdenum separation effect in the copper-molybdenum concentrate, reduce the consumption of flotation reagents, and the composite inhibitor has the advantages of low toxicity, environmental friendliness and the like.

Description

Technical Field

[0001] This invention relates to a copper-molybdenum flotation separation method, specifically a method for achieving copper-molybdenum flotation separation based on potential control and multi-element inhibition synergy, belonging to the field of mineral processing technology. Background Technology

[0002] Molybdenum possesses excellent electrical conductivity, high-temperature resistance, and high strength, making it widely used in chemical and metallurgical fields. Molybdenite is the primary source of molybdenum, accounting for approximately 99% of all molybdenum production. In porphyry molybdenite deposits, chalcopyrite and molybdenite are often closely associated. Therefore, copper-molybdenum separation has always been a major challenge in the beneficiation of porphyry molybdenite. Flotation, magnetic separation, leaching, and combined beneficiation and metallurgical processes are feasible methods for achieving copper-molybdenum separation. In industry, flotation is considered the most commonly used and efficient method. Since the grades of both molybdenum and copper in porphyry copper-molybdenum deposits are relatively low, a mixed flotation process can maximize the recovery rate of copper and molybdenum metals. The copper-molybdenum mixed flotation process uses collectors such as kerosene and xanthate to co-enrich chalcopyrite and pyrite to obtain a mixed copper-molybdenum concentrate. Then, a "copper suppression and molybdenum flotation" strategy is adopted, adding a chalcopyrite inhibitor to float molybdenite. Due to the adsorption of the collector on the surface of chalcopyrite, the difference in floatability between it and molybdenite is further reduced, increasing the difficulty of separation.

[0003] Chalcopyrite suppression strategies mainly include: (1) cyanide, which dissolves in the slurry to form CN. - , which complexes with copper atoms on the surface of brass, increasing the hydrophilicity of chalcopyrite. Cyanide has excellent inhibitory effect, but due to its high toxicity, it has extremely high requirements for personnel safety and environmental protection. (2) Sulfides, sodium sulfide or sodium hydrosulfide form HS in the slurry. - Sodium sulfide selectively adsorbs onto the surface of chalcopyrite, generating hydrophilic substances that reduce the floatability of chalcopyrite. However, to ensure effective inhibition, a large amount of sodium sulfide is required, leading to difficult-to-treat wastewater and significant environmental impact. Recently, Chinese patent application (CN119390632A) disclosed a polythiocarboxylic acid amine copper-molybdenum separation inhibitor. Polythiocarboxylic acid amines, as copper mineral inhibitors, can improve the separation efficiency of copper and molybdenum. For example, using the common copper mineral inhibitor sodium sulfide, the Mo content in molybdenum concentrate reaches 57.9381%, while the Cu content is only 0.36%. However, using the synthesized novel copper mineral inhibitor polythiocarboxylic acid amine can improve the grade of molybdenum concentrate, achieving a Mo content of 61.0816% and a Cu content of only 0.13%. Compared to sodium sulfide, the improvement in copper-molybdenum separation effect of polythiocarboxylic acid amines is limited and still needs further improvement. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a method for copper-molybdenum flotation separation based on potential regulation and synergistic multi-component inhibition. This method is based on the use of a composite inhibitor composed of mercaptoacetic acid, sodium dicarboxymethyl trithiocarbonate, and sodium alginate. This composite inhibitor enhances the inhibition of copper minerals through the synergistic effect of flotation potential regulation and multi-component inhibition, utilizing a combination of physical and chemical adsorption to improve the separation effect of copper and molybdenum in copper-molybdenum concentrate, while reducing flotation reagent consumption. Furthermore, this composite inhibitor has advantages such as low toxicity and greater environmental friendliness.

[0005] To achieve the above-mentioned technical objectives, this invention provides a method for copper-molybdenum flotation separation based on potential regulation and multi-element inhibition synergy. The method involves adjusting a copper-molybdenum mixed concentrate to obtain a slurry, adding flotation reagents including a copper mineral inhibitor and a molybdenum mineral collector to the slurry for flotation separation to obtain a molybdenum concentrate. The copper mineral inhibitor is composed of the following components by mass: 5-20 parts mercaptoacetic acid, 5-20 parts sodium dicarboxymethyl trithiocarbonate, and 0.5-2 parts sodium alginate.

[0006] The main active ingredients of the copper mineral inhibitor of this invention are mercaptoacetic acid, sodium dicarboxymethyl trithiocarbonate, and sodium alginate. These components not only effectively regulate the potential of the slurry but also adsorb onto the surface of copper minerals through multiple physical and chemical interactions. Based on the synergistic effect of flotation potential regulation and multi-component inhibition, the inhibitory effect on copper minerals is improved. More specifically, mercaptoacetic acid contains both thiol and carboxyl groups. Its thiol groups can selectively adsorb onto the surface of copper minerals through chemical reactions. Furthermore, the thiol groups have strong reducing properties and are oxidized to form dithioglycolic acid, releasing electrons and thereby altering the potential in the slurry to enhance the inhibitory effect on copper minerals. Meanwhile, mercaptoacetic acid and sodium dicarboxymethyl trithiocarbonate are small organic molecules, while sodium alginate is a large organic molecule. The thiol groups in mercaptoacetic acid are chemically reactive with copper ions on the surface of copper mineral lattice, allowing for highly selective adsorption onto the copper mineral surface through chemical action. Sodium dicarboxymethyl trithiocarbonate, on the other hand, utilizes its polar groups to adsorb onto the copper mineral surface through coordination or electrostatic adsorption. Sodium alginate, with its colloidal properties, can be physically adsorbed onto the copper mineral surface. Thus, the synergistic effect of physical and chemical adsorption of the inhibitory components can enhance the hydrophilic modification of the copper mineral surface. Furthermore, the combined use of large organic molecules and small organic molecule inhibitory components can fully utilize the structural spatial characteristics of both, avoiding the steric hindrance effect caused by the limited number of effective adsorption sites, thereby strengthening the inhibitory effect of the inhibitory components on the copper mineral.

[0007] As a preferred embodiment, the slurry preparation involves adjusting the slurry concentration to 30-40% and the pH to 10.0-10.5. Lime is used as the pH adjuster. The dosage of the pH adjuster in the roughing operation is 800 g / t, adjusting the pH to 10.0-10.5. By adjusting the pH of the lime slurry within the range of 10.0-10.5, the pH adjuster ensures that an appropriate amount of free OH- is retained in the slurry. - Together with thioglycolic acid, it participates in the regulation of potential and improves the inhibition effect on the same mineral.

[0008] The proportions of thioglycolic acid, sodium dicarboxymethyl trithiocarbonate, and sodium alginate in the copper mineral inhibitor of this invention are optimized. For example, controlling the ratio of large molecules like sodium alginate to small molecules like thioglycolic acid and sodium dicarboxymethyl trithiocarbonate within an appropriate range allows for full utilization of the active sites on the copper mineral surface, enhancing the inhibitory effect. The ratio of thioglycolic acid to sodium dicarboxymethyl trithiocarbonate also needs to be controlled within an appropriate range. If the proportion of thioglycolic acid is too low, its ability to regulate the pulp potential decreases; if the proportion of thioglycolic acid is too high, the selective inhibitory effect of sodium dicarboxymethyl trithiocarbonate on copper minerals is reduced. Controlling the proportions of the three components within a suitable range allows for full utilization of their synergistic inhibitory effect while reducing reagent consumption. As a preferred embodiment, the molybdenum mineral collector includes kerosene. Kerosene is a conventional molybdenum mineral collector. When kerosene is used as a molybdenum mineral collector in conjunction with the copper mineral inhibitor of this invention, it exhibits good copper-molybdenum separation effects.

[0009] As a preferred embodiment, the flotation process includes one roughing process, at least two cleaning processes, and at least two sweeping processes.

[0010] As a preferred embodiment, the reagent system for the roughing process is as follows: the dosage of copper mineral inhibitor relative to the copper-molybdenum mixed concentrate is 1050 g / t to 4200 g / t; the dosage of molybdenum mineral collector relative to the copper-molybdenum mixed concentrate is 40 g / t to 160 g / t; and the dosage of frother relative to the copper-molybdenum mixed concentrate is 20 g / t to 80 g / t. The frother is further preferably No. 2 oil.

[0011] As a preferred embodiment, the amount of thioglycolic acid relative to the copper-molybdenum mixed concentrate in the copper mineral inhibitor is 500~2000 g / t, the amount of sodium dicarboxymethyl trithiocarbonate relative to the copper-molybdenum mixed concentrate is 500 g / t~2000 g / t, and the amount of sodium alginate relative to the copper-molybdenum mixed concentrate is 50 g / t~200 g / t.

[0012] As a further preferred embodiment, the amount of mercaptoacetic acid used is adjusted to bring the potential of the slurry to -300mV to -350mV. The potential is mainly affected by mercaptoacetic acid, which can selectively adsorb onto the surface of copper minerals, thereby reducing the overall potential. The more negative the potential, the more difficult it is for the molybdenum mineral collector to adsorb onto the surface of copper minerals due to potential repulsion, thus reducing its flotation performance.

[0013] As a preferred embodiment, the selected formulation is as follows: only copper mineral inhibitors are used, and in the Nth selection, the amount of copper mineral inhibitor used is (0.4~0.6) of the amount of copper mineral inhibitor used in the rough selection. N The ratio is N, where N is a positive integer. Further optimization involves using 0.5 times the amount of copper mineral inhibitor used in the initial selection. N times.

[0014] As a preferred embodiment, the reagent regime for the scavenging is as follows: only molybdenum mineral collectors and frothers are used, and in the Nth scavenging, the amount of molybdenum mineral collector used is (0.4~0.6) of the amount of molybdenum mineral collector used in the roughing scavenging. N The amount of foaming agent used is 0.4 to 0.6 times that used in the roughing selection. N The multiple, where N is a positive integer.

[0015] Compared with the prior art, the beneficial technical effects of this invention are as follows:

[0016] In the copper-molybdenum flotation separation process of this invention, copper mineral inhibitors consisting of thioglycolic acid, sodium dicarboxymethyl trithiocarbonate, and sodium alginate are used. The synergistic effect of potential regulation and multiple inhibitors enhances the flotation separation of copper and molybdenum in mixed copper-molybdenum concentrates, achieving better copper-molybdenum separation results. On one hand, free OH- under weakly alkaline conditions is utilized... - The invention employs several methods to enhance the inhibition of chalcopyrite. First, it utilizes thioglycolic acid to regulate the pulp potential, thereby strengthening the inhibition effect on chalcopyrite. Second, it leverages the multiple physical and chemical adsorption of thioglycolic acid, sodium dicarboxymethyl trithiocarbonate, and sodium alginate on the copper mineral surface, enhancing the selective and efficient hydrophilic modification of the copper mineral surface by the inhibitory components. Third, the combined application of large and small organic molecule inhibitory components avoids the steric hindrance effect caused by the limited number of effective adsorption sites on the copper mineral surface, thus strengthening the inhibition of chalcopyrite. Compared to existing conventional copper mineral inhibitors like sodium sulfide, the copper mineral inhibitor of this invention can significantly improve the recovery rate and grade of molybdenum concentrate. For example, for a mixed copper-molybdenum concentrate with a molybdenum content of 1.34% and a copper content of 17.31%, after flotation separation, the molybdenum concentrate has a molybdenum grade of 23.53%, a copper grade of 0.83%, and a molybdenum recovery rate of 84.64%, while the copper concentrate has a copper grade of 18.14%, a molybdenum grade of 0.83%, and a copper recovery rate of 99.77%.

[0017] In the copper-molybdenum flotation separation process of this invention, a copper mineral depressant with active ingredients of mercaptoacetic acid, sodium dicarboxymethyl trithiocarbonate, and sodium alginate is used. Compared with sodium sulfide as a copper mineral depressant in existing technologies, this significantly reduces the consumption of flotation reagents. For example, when using sodium sulfide as a copper mineral depressant in existing technologies, its dosage needs to reach 10 kg / t, and sometimes even as high as 40 kg / t, to achieve suitable flotation parameters. However, the copper mineral depressant consumption of this invention is halved, and a better copper-molybdenum flotation separation effect is achieved.

[0018] The copper mineral inhibitor of this invention contains components such as mercaptoacetic acid, sodium dicarboxymethyl trithiocarbonate, and sodium alginate, all of which are biodegradable, have low toxicity, require less stringent subsequent water treatment operations, and have minimal impact on the ecological environment. Attached Figure Description

[0019] Figure 1 This is a process flow diagram of copper-molybdenum flotation separation in copper-molybdenum mixed concentrate according to the present invention. Detailed Implementation

[0020] The following specific embodiments provide a clearer and more complete description of the present invention. The embodiments listed below are only a part of the embodiments of the present invention, and not all of them. The scope of protection of the present invention is not limited by the embodiments listed.

[0021] Unless otherwise specified, the chemical reagents used in the following examples and comparative examples are all commercially available products.

[0022] The copper-molybdenum mixed concentrates involved in the following examples and comparative examples contain 1.34% molybdenum and 17.31% copper. These concentrates are tailings from a copper-molybdenum beneficiation plant (80% of which are -400 mesh). The copper-molybdenum mixed concentrate is obtained through a copper-molybdenum mixed flotation process. The main metallic minerals in the copper-molybdenum mixed concentrate are molybdenite and chalcopyrite.

[0023] The following examples and comparative examples are small-scale closed-circuit laboratory experiments on copper-molybdenum mixed concentrates.

[0024] In the following examples and comparative examples, the flotation reagents were measured per ton of copper-molybdenum mixed concentrate.

[0025] Example 1

[0026] S1: The copper-molybdenum mixed concentrate is pretreated to obtain a slurry with a slurry concentration of 30%.

[0027] S2: Add 800 g / t of lime to the slurry to adjust the pH to approximately 10, and stir for 3 minutes. Then add 2000 g / t of mercaptoacetic acid to adjust the slurry potential to approximately -340 mV, and stir for 3 minutes. Next, add 2000 g / t of DBT and 200 g / t of sodium alginate at a mass ratio of 10:10:1 (mercaptoacetic acid: sodium dicarboxymethyl trithiocarbonate (DBT): sodium alginate), and stir for 3 minutes. Then add 160 g / t of kerosene and 80 g / t of frother (No. 2 oil), and stir for 3 minutes each. Aerate and skim the foam for 5 minutes to obtain the roughing concentrate and roughing tailings.

[0028] S3: Add copper mineral inhibitor to the rougher concentrate obtained from the roughing operation at a mass ratio of 10:10:1 (thioglycolic acid:DBT:sodium alginate), with 1000g / t of thioglycolic acid, 1000g / t of DBT, and 100g / t of sodium alginate. Stir for three minutes; aerate and skim for five minutes to obtain the concentrate and tailings from the cleaning operation 1. The tailings from this operation are mixed with the concentrate from the scavenging operation 1 and returned sequentially to the roughing operation. Add a combined collector to the cleaning operation 1 at a mass ratio of 10:10:1 (thioglycolic acid:DBT:sodium alginate), with 500g / t of thioglycolic acid, 500g / t of DBT, and 50g / t of sodium alginate. Stir for three minutes; aerate and skim for five minutes to obtain the concentrate and tailings from the cleaning operation 2. The tailings from this operation are returned sequentially to the cleaning operation 1. The concentrate is the molybdenum concentrate.

[0029] S4: Add 80g / t of collector kerosene to the roughing tailings obtained from the roughing operation, stir for 3 minutes, then add 40g / t of No. 2 oil, stir for 3 minutes; aerate and skim for 5 minutes to obtain the concentrate and tailings from the scavenging operation 1. The concentrate from this operation is mixed with the tailings from the cleaning operation 1 and returned sequentially to the roughing operation. Add 40g / t of collector kerosene to the tailings obtained from the scavenging operation 1, stir for 3 minutes, then add 20g / t of No. 2 oil, stir for 3 minutes; aerate and skim for 5 minutes to obtain the concentrate and tailings from the scavenging operation 2. The concentrate from this operation is returned sequentially to the scavenging operation 1. The tailings are the copper concentrate.

[0030] The molybdenum concentrate obtained through Example 1 had a molybdenum grade of 23.53%, a copper grade of 0.83%, and a molybdenum recovery rate of 84.64%; the copper concentrate had a copper grade of 18.14%, a molybdenum grade of 0.83%, and a copper recovery rate of 99.77%.

[0031] Table 1 Results of copper-molybdenum flotation separation test in Example 1

[0032] Example 2

[0033] S1: The copper-molybdenum mixed concentrate is pretreated to obtain a slurry with a slurry concentration of 35%.

[0034] S2: Add 900 g / t of lime to the slurry to adjust the pH to approximately 10.5 and stir for 3 minutes. Then add 2000 g / t of mercaptoacetic acid to adjust the slurry potential to approximately -335 mV and stir for 3 minutes. Next, add 1600 g / t of DBT and 200 g / t of sodium alginate at a mass ratio of 10:8:1 (mercaptoacetic acid: sodium dicarboxymethyl trithiocarbonate (DBT): sodium alginate) and stir for 3 minutes. Then add 160 g / t of kerosene and 80 g / t of frother (No. 2 oil) and stir for 3 minutes each. Aerate and skim the foam for 5 minutes to obtain the roughing concentrate and roughing tailings.

[0035] S3: Add copper mineral inhibitor to the rougher concentrate obtained from the roughing operation at a mass ratio of 10:8:1 (thioglycolic acid:DBT:sodium alginate), with 1000g / t of thioglycolic acid, 800g / t of DBT, and 100g / t of sodium alginate, and stir for three minutes; aerate and skim for five minutes to obtain the concentrate and tailings from the cleaning operation 1. The tailings from this operation are mixed with the concentrate from the scavenging operation 1 and returned sequentially to the roughing operation. Add a combined collector to the cleaner obtained from the cleaning operation 1 at a mass ratio of 10:8:1 (thioglycolic acid:DBT:sodium alginate), with 500g / t of thioglycolic acid, 400g / t of DBT, and 50g / t of sodium alginate, and stir for three minutes; aerate and skim for five minutes to obtain the concentrate and tailings from the cleaning operation 2. The tailings from this operation are returned sequentially to the cleaning operation 1. The concentrate is the molybdenum concentrate.

[0036] S4: Add 80g / t of collector kerosene to the roughing tailings obtained from the roughing operation, stir for 3 minutes, then add 40g / t of No. 2 oil, stir for 3 minutes; aerate and skim for 5 minutes to obtain the concentrate and tailings from the scavenging operation 1. The concentrate from this operation is mixed with the tailings from the cleaning operation 1 and returned sequentially to the roughing operation. Add 40g / t of collector kerosene to the tailings obtained from the scavenging operation 1, stir for 3 minutes, then add 20g / t of No. 2 oil, stir for 3 minutes; aerate and skim for 5 minutes to obtain the concentrate and tailings from the scavenging operation 2. The concentrate from this operation is returned sequentially to the scavenging operation 1. The tailings are the copper concentrate.

[0037] The molybdenum concentrate obtained through Example 2 had a molybdenum grade of 22.16%, a copper grade of 1.67%, and a molybdenum recovery rate of 81.20%; the copper concentrate had a copper grade of 18.12%, a molybdenum grade of 0.26%, and a copper recovery rate of 99.53%.

[0038] Table 2 Results of copper-molybdenum flotation separation test in Example 2

[0039] Example 3

[0040] S1: The copper-molybdenum mixed concentrate is pretreated to obtain a slurry with a slurry concentration of 30%.

[0041] S2: Add 850 g / t of lime to the slurry to adjust the pH to approximately 10.2, and stir for 3 minutes. Then add 1600 g / t of mercaptoacetic acid to adjust the slurry potential to approximately -320 mV, and stir for 3 minutes. Next, add 2000 g / t of DBT and 200 g / t of sodium alginate at a mass ratio of 8:10:1 (mercaptoacetic acid: sodium dicarboxymethyl trithiocarbonate (DBT): sodium alginate), and stir for 3 minutes. Then add 160 g / t of kerosene and 80 g / t of frother (No. 2 oil), and stir for 3 minutes each. Aerate and skim the foam for 5 minutes to obtain the roughing concentrate and roughing tailings.

[0042] S3: Add copper mineral inhibitor to the rougher concentrate obtained from the rougher operation at a mass ratio of 8:10:1 (thioglycolic acid:DBT:sodium alginate), with 800 g / t of thioglycolic acid, 1000 g / t of DBT, and 100 g / t of sodium alginate. Stir for three minutes; aerate and skim for five minutes to obtain the concentrate and tailings from the cleaner operation 1. The tailings from this operation are mixed with the concentrate from the scavenger operation 1 and returned sequentially to the rougher operation. Add a combined collector to the cleaner obtained from the cleaner operation 1 at a mass ratio of 8:10:1 (thioglycolic acid:DBT:sodium alginate), with 400 g / t of thioglycolic acid, 500 g / t of DBT, and 50 g / t of sodium alginate. Stir for three minutes; aerate and skim for five minutes to obtain the concentrate and tailings from the cleaner operation 2. The tailings from this operation are returned sequentially to the cleaner operation 1. The concentrate is the molybdenum concentrate.

[0043] S4: Add 80g / t of collector kerosene to the roughing tailings obtained from the roughing operation, stir for 3 minutes, then add 40g / t of No. 2 oil, stir for 3 minutes; aerate and skim for 5 minutes to obtain the concentrate and tailings from the scavenging operation 1. The concentrate from this operation is mixed with the tailings from the cleaning operation 1 and returned sequentially to the roughing operation. Add 40g / t of collector kerosene to the tailings obtained from the scavenging operation 1, stir for 3 minutes, then add 20g / t of No. 2 oil, stir for 3 minutes; aerate and skim for 5 minutes to obtain the concentrate and tailings from the scavenging operation 2. The concentrate from this operation is returned sequentially to the scavenging operation 1. The tailings are the copper concentrate.

[0044] The molybdenum concentrate obtained through Example 3 had a molybdenum grade of 21.95%, a copper grade of 1.87%, and a molybdenum recovery rate of 82.89%; the copper concentrate had a copper grade of 18.13%, a molybdenum grade of 0.24%, and a copper recovery rate of 99.45%.

[0045] Table 3 Results of copper-molybdenum flotation separation test in Example 3

[0046] Comparative Example 1

[0047] The difference between Comparative Example 1 and Example 1 is that sodium sulfide is used instead of "mercaptoacetic acid + DBT + sodium alginate" as the copper mineral suppressant. Specifically, 4200 g / t of sodium sulfide is added in the roughing operation, 2100 g / t of sodium sulfide is added in the cleaning operation 1, and 1050 g / t of sodium sulfide is added in the cleaning operation 2. Other operations and flotation reagent regimes are the same as in Example 1.

[0048] The molybdenum concentrate obtained by Comparative Example 1 had a molybdenum grade of 14.32%, a copper grade of 6.75%, and a molybdenum recovery rate of 58.35%; the copper concentrate had a copper grade of 17.92%, a molybdenum grade of 0.59%, and a copper recovery rate of 97.87%.

[0049] Table 4 Results of copper-molybdenum flotation separation test in Comparative Example 1

[0050] Comparative Example 2

[0051] The difference between Comparative Example 2 and Example 1 is that: a single mercaptoacetic acid is used instead of "mercaptoacetic acid + DBT + sodium alginate" as the copper mineral inhibitor. Specifically, 4200 g / t of mercaptoacetic acid is added in the roughing operation, 2100 g / t of mercaptoacetic acid is added in the cleaning operation 1, and 1050 g / t of mercaptoacetic acid is added in the cleaning operation 2. Other operations and flotation reagent regimes are the same as in Example 1.

[0052] The molybdenum concentrate obtained by Comparative Example 2 had a molybdenum grade of 17.91%, a copper grade of 4.39%, and a molybdenum recovery rate of 77.39%; the copper concentrate had a copper grade of 18.10%, a molybdenum grade of 0.32%, and a copper recovery rate of 98.53%.

[0053] Table 5 Results of copper-molybdenum flotation separation test in Comparative Example 2

[0054] Comparative Example 3

[0055] The difference between Comparative Example 2 and Example 1 is that DBT is used instead of "mercaptoacetic acid + DBT + sodium alginate" as the copper mineral inhibitor. Specifically, 4200 g / t of DBT is added in the roughing operation, 2100 g / t of DBT is added in the cleaning operation 1, and 1050 g / t of DBT is added in the cleaning operation 2. Other operations and flotation reagent regimes are the same as in Example 1.

[0056] The molybdenum concentrate obtained by Comparative Example 3 had a molybdenum grade of 17.86%, a copper grade of 3.94%, and a molybdenum recovery rate of 77.70%; the copper concentrate had a copper grade of 18.14%, a molybdenum grade of 0.32%, and a copper recovery rate of 98.67%.

[0057] Table 6 shows the results of the copper-molybdenum flotation separation test in Comparative Example 3.

[0058] Comparative Example 4

[0059] The difference between Comparative Example 4 and Example 1 is that "thioglycolic acid + sodium alginate" is used instead of "thioglycolic acid + DBT + sodium alginate" as the copper mineral inhibitor. Specifically, 4000 g / t of thioglycolic acid and 200 g / t of sodium alginate are added in the roughing operation, 2000 g / t of thioglycolic acid and 100 g / t of sodium alginate are added in the cleaning operation 1, and 1000 g / t of thioglycolic acid and 50 g / t of sodium alginate are added in the cleaning operation 2. Other operations and flotation reagent system are the same as in Example 1.

[0060] The molybdenum concentrate obtained by Comparative Example 4 had a molybdenum grade of 19.32%, a copper grade of 1.79%, and a molybdenum recovery rate of 78.00%; the copper concentrate had a copper grade of 18.20%, a molybdenum grade of 0.31%, and a copper recovery rate of 99.44%.

[0061] Table 7 Results of copper-molybdenum flotation separation test in Comparative Example 4

[0062] Comparative Example 5

[0063] The difference between Comparative Example 5 and Example 1 is that "DBT + sodium alginate" is used instead of "thioglycolic acid + DBT + sodium alginate" as the copper mineral inhibitor. Specifically, 4000 g / t of DBT and 2000 g / t of sodium alginate are added in the roughing operation, 2000 g / t of DBT and 100 g / t of sodium alginate are added in the cleaning operation 1, and 1000 g / t of DBT and 50 g / t of sodium alginate are added in the cleaning operation 2. Other operations and flotation reagent regimes are the same as in Example 1.

[0064] The molybdenum concentrate obtained by Comparative Example 5 had a molybdenum grade of 19.72%, a copper grade of 1.31%, and a molybdenum recovery rate of 78.59%; the copper concentrate had a copper grade of 18.21%, a molybdenum grade of 0.30%, and a copper recovery rate of 99.60%.

[0065] Table 8. Results of copper-molybdenum flotation separation test in Comparative Example 5

[0066] Comparative Example 6

[0067] The difference between Comparative Example 6 and Example 1 is that "mercaptoacetic acid + DBT" is used instead of "mercaptoacetic acid + DBT + sodium alginate" as the copper mineral inhibitor. Specifically, 2100 g / t of mercaptoacetic acid and 2100 g / t of DBT are added in the roughing operation, 1050 g / t of mercaptoacetic acid and 1050 g / t of DBT are added in the cleaning operation 1, and 525 g / t of mercaptoacetic acid and 525 g / t of DBT are added in the cleaning operation 2. Other operations and flotation reagent regimes are the same as in Example 1.

[0068] The molybdenum concentrate obtained by Comparative Example 6 had a molybdenum grade of 20.86%, a copper grade of 1.03%, and a molybdenum recovery rate of 78.30%; the copper concentrate had a copper grade of 18.17%, a molybdenum grade of 0.31%, and a copper recovery rate of 99.74%.

[0069] Table 9 Results of copper-molybdenum flotation separation test in Comparative Example 6 .

Claims

1. A method for copper-molybdenum flotation separation based on potential modulation and synergistic multi-element inhibition, characterized in that: The copper-molybdenum mixed concentrate is slurryed to obtain a pulp. Flotation reagents, including copper mineral inhibitors and molybdenum mineral collectors, are added to the pulp for flotation separation to obtain molybdenum concentrate. The copper mineral inhibitor is composed of the following components by mass: 5-20 parts mercaptoacetic acid, 5-20 parts sodium dicarboxymethyl trithiocarbonate, and 0.5-2 parts sodium alginate.

2. The method for copper-molybdenum flotation separation based on potential regulation and synergistic multi-element inhibition according to claim 1, characterized in that: The pulp preparation involves adjusting the pulp concentration to 30-40% and the pH to 10.0-10.

5.

3. The method for copper-molybdenum flotation separation based on potential modulation and synergistic multi-element inhibition according to claim 1, characterized in that: The molybdenum mineral collector contains kerosene.

4. A method for copper-molybdenum flotation separation based on potential modulation and synergistic multi-element inhibition according to any one of claims 1 to 3, characterized in that: The flotation process includes one roughing process, at least two cleaning processes, and at least two sweeping processes.

5. The method for copper-molybdenum flotation separation based on potential modulation and synergistic multi-element inhibition according to claim 4, characterized in that: The preliminary selection pharmaceutical regimen is as follows: The dosage of copper mineral inhibitor relative to copper-molybdenum mixed concentrate is 1050 g / t to 4200 g / t; The dosage of molybdenum mineral collector relative to copper-molybdenum mixed concentrate is 40g / t~160g / t; The amount of foaming agent used relative to the copper-molybdenum mixed concentrate is 20g / t to 80g / t.

6. The method for copper-molybdenum flotation separation based on potential modulation and synergistic multi-element inhibition according to claim 5, characterized in that: The copper mineral inhibitor is prepared by using thioglycolic acid at a rate of 500-2000 g / t relative to the copper-molybdenum mixed concentrate, sodium dicarboxymethyl trithiocarbonate at a rate of 500-2000 g / t relative to the copper-molybdenum mixed concentrate, and sodium alginate at a rate of 50-200 g / t relative to the copper-molybdenum mixed concentrate.

7. The method for copper-molybdenum flotation separation based on potential modulation and synergistic multi-element inhibition according to claim 6, characterized in that: The amount of mercaptoacetic acid used is adjusted to bring the potential of the slurry to -300mV to -350mV.

8. The method for copper-molybdenum flotation separation based on potential modulation and synergistic multi-element inhibition according to claim 4, characterized in that: The selected formulation is as follows: only copper mineral inhibitors are used, and in the Nth selection, the amount of copper mineral inhibitor used is (0.4~0.6) of the amount of copper mineral inhibitor used in the rough selection. N The multiple, where N is a positive integer.

9. The method for copper-molybdenum flotation separation based on potential modulation and synergistic multi-element inhibition according to claim 4, characterized in that: The reagent regime for the scavenging is as follows: only molybdenum mineral collectors and frothers are used, and in the Nth scavenging, the amount of molybdenum mineral collector used is (0.4~0.6) of the amount of molybdenum mineral collector used in the roughing scavenging. N The amount of foaming agent used is 0.4 to 0.6 times that used in the roughing selection. N The multiple, where N is a positive integer.

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