A copper-lead separation inhibitor, its preparation method and application method

Abstract

The application discloses a copper-lead separation inhibitor and a preparation method and an application method thereof, and the preparation method comprises the following steps: mixing acrylic acid-2-acrylamide-2-methylpropane sulfonic acid copolymer, hydrolyzed polymaleic anhydride, sodium silicate and sodium sulfite, and performing emulsification and dispersion to obtain a uniform viscous suspension. The application method comprises the following steps: adding active carbon, sodium sulfide, the copper-lead separation inhibitor, a collector Z-200 and a foaming agent No. 2 oil into copper-lead mixed concentrates to perform copper-lead separation flotation operation; performing three times of cleaning on the copper rough concentrates; and performing three times of scavenging on the obtained lead rough concentrates. The inhibitor composition is non-toxic; the inhibitor is rich in carboxyl and sulfonic acid groups, and under the action of the two main groups, the adsorption effect of the inhibitor on the surface of galena can be enhanced; the inhibitor can be used under neutral, weak acidic and weak alkaline conditions, has strong inhibition effect on galena, is strong in selectivity, is easy to obtain and store, is friendly to the environment, and can effectively improve the flotation separation indexes of copper-lead sulfide ores.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ore-dressing reagent, and particularly relates to a copper-lead separation inhibitor for separating copper and lead in the process of sulfide ore flotation, and a preparation method and an application method thereof. BACKGROUND

[0002] Metal copper and lead are important basic raw materials, which are widely used in the fields of military equipment, aerospace, electronic components, long-distance cables and heat dissipation equipment, and can also be used to form many kinds of alloys. In nature, copper elements are mainly present in chalcopyrite, bornite and chalcocite minerals. Lead elements are mainly present in galena. Chalcopyrite is the most widely distributed main copper ore in China. However, in natural deposits, chalcopyrite and galena and other sulfide ores are closely associated and difficult to separate, which becomes an obstacle to efficient recovery of copper and lead resources.

[0003] In industry, the froth flotation method is the most effective method for separating chalcopyrite and galena. Long-term production practice shows that due to the similar physical and chemical properties of the surfaces of the two minerals, they exhibit similar floatability in the flotation process, which is a difficulty in separating chalcopyrite and galena. In order to reduce the influence on subsequent copper smelting, an inhibitor is usually added in the flotation process to increase the difference in floatability between the minerals, so as to separate chalcopyrite and galena by flotation.

[0004] At present, the lead-inhibiting and copper-floating method is mainly used for copper-lead mixed concentrate. In this process, the main inhibitors are divided into two types: 1. Inorganic inhibitors, mainly potassium dichromate, sodium sulfite and the like. 2. Organic inhibitors, mainly sodium humate, dextrin, carboxymethyl cellulose and the like. For inorganic inhibitors, potassium dichromate is the most common inhibitor for galena. However, under weak alkaline conditions, dichromate only has an inhibitory effect on the surface-oxidized galena. When dichromate is used, long-time stirring is required to promote the surface oxidation of galena, which has a high requirement for operating conditions and is not conducive to improving the processing capacity. Although sodium sulfite does not require long-time conditioning, it has weak inhibitory effect when used as an inhibitor, and a large amount of reagent is required, which is not conducive to environmental protection. Organic inhibitors (such as starch and carboxymethyl cellulose) can adsorb the surface of the mineral and form a hydrophobic film to hinder the subsequent coverage of the collector, so that the mineral is inhibited, and has the advantages of fast reaction time and the like. However, the natural organic inhibitors mainly rely on the weak adsorption of carboxyl and hydroxyl groups on the surface of galena, which makes it difficult to achieve ideal inhibitory effect in the application process. In addition, the addition of such high-molecular organic inhibitors will cause the slurry to be thick, intensify the mineral entrainment phenomenon, and is not conducive to the filtration and settling tank of the concentrate and tailings.

[0005] In summary, the existing inhibitors have the problems of weak inhibition effect, poor separation effect, strong reagent toxicity, and great environmental pollution when used in the copper-lead separation flotation process, therefore, it is of great significance to seek a copper-lead separation inhibitor with good selectivity, strong inhibition effect, and small environmental pollution for improving the comprehensive utilization level of copper mineral resources in China. SUMMARY

[0006] The technical problem to be solved by the present application is to provide a copper-lead separation inhibitor and a preparation method and application method thereof, which can effectively reduce the content of lead in the concentrate product while ensuring the copper recovery rate in the copper-lead flotation separation process, so that the quality of the copper concentrate product is significantly improved, has the advantages of good separation effect, small environmental pollution, and can be widely applied to the flotation process.

[0007] To achieve the above technical purpose, the technical solution adopted by the present application is as follows:

[0008] A copper-lead separation inhibitor is prepared from the following raw materials: acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, hydrolyzed polymaleic anhydride, sodium silicate, and sodium sulfite.

[0009] The mass ratio of the acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, the hydrolyzed polymaleic anhydride, the sodium silicate, and the sodium sulfite is 5.5-6.5:1.2-2.2:0.8-1.5:0.8-1.5.

[0010] As a further improved technical solution of the present application, the mass ratio of the acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, the hydrolyzed polymaleic anhydride, the sodium silicate, and the sodium sulfite is 6:2:1:1.

[0011] To achieve the above technical purpose, another technical solution adopted by the present application is as follows:

[0012] A preparation method of a copper-lead separation inhibitor includes: mixing acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, hydrolyzed polymaleic anhydride, sodium silicate, and sodium sulfite in proportion, and then performing emulsification and dispersion to obtain a uniform viscous suspension, which is the copper-lead separation inhibitor.

[0013] As a further improved technical solution of the present application, the preparation method of the copper-lead separation inhibitor specifically includes: mixing acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, hydrolyzed polymaleic anhydride, sodium silicate, and sodium sulfite in proportion at room temperature, and then adding them into a high-shear emulsifier for emulsification and dispersion to obtain a uniform viscous suspension, which is the copper-lead separation inhibitor, wherein the rotation speed of the high-shear emulsifier is not less than 6000 rpm, and the emulsification and dispersion time is 20 minutes.

[0014] To achieve the above technical purpose, another technical scheme adopted by the present application is:

[0015] A method for applying a copper-lead separation inhibitor, comprising:

[0016] Step 1: adding activated carbon and sodium sulfide to the copper-lead mixed concentrate, stirring, then adding the copper-lead separation inhibitor, stirring, and then adding the collector Z-200 and the frother No. 2 oil in sequence to perform copper-lead separation flotation operation, and obtaining copper rough concentrate and lead rough concentrate through roughing;

[0017] Step 2: performing three times of cleaning on the obtained copper rough concentrate, and adding the copper-lead separation inhibitor in the cleaning process;

[0018] Step 3: performing three times of scavenging on the obtained lead rough concentrate, and adding the collector Z-200 and the frother No. 2 oil in the scavenging process, and the scavenging tailings being the lead concentrate;

[0019] Step 4: returning the middlings in the cleaning in Step 2 and the scavenging in Step 3 to the previous stage in sequence to form a closed circuit.

[0020] As a further improved technical scheme of the present application, in Step 1, the activated carbon and the sodium sulfide are added to the copper-lead mixed concentrate, stirred for 10-20 minutes, and then the copper-lead separation inhibitor is added and stirred for 5 minutes.

[0021] As a further improved technical scheme of the present application, in Step 1, the amount of the activated carbon is 500-1200 g / t, the amount of the sodium sulfide is 500-1000 g / t, the amount of the copper-lead separation inhibitor is 500-1200 g / t, the amount of the collector Z-200 is 50-100 g / t, and the amount of the frother No. 2 oil is 15-50 g / t.

[0022] As a further improved technical scheme of the present application, in Step 2, the amount of the copper-lead separation inhibitor added in each cleaning is 0.1-0.9 times the amount of the copper-lead separation inhibitor added in Step 1.

[0023] As a further improved technical scheme of the present application, in Step 3, the amount of the collector Z-200 added in each scavenging is 0.1-0.7 times the amount of the collector Z-200 added in Step 1, and the amount of the frother No. 2 oil added in each scavenging is 0.1-0.5 times the amount of the frother No. 2 oil added in Step 1.

[0024] In the above scheme, the main component of the copper-lead separation inhibitor is propylene acid-2-acrylamide-2-methyl propyl sulfonic acid copolymer which has a strong inhibitory effect on galena, and further contains hydrolyzed polymaleic anhydride, sodium silicate and sodium sulfite to further strengthen the inhibitory effect and selectivity and improve the separation effect of chalcopyrite and galena.

[0025] Compared with the prior art, the application has the following advantages:

[0026] The main component of the copper-lead separation inhibitor in the application is acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer with a mass ratio of 5.5-6.5. Since it is rich in carboxyl, sulfonic acid group and hydroxyl, it can react with the Pb(OH) + , Pb 2 + The active sites produce electrostatic adsorption, chemical adsorption and chelation, effectively strengthen the adsorption of the inhibitor on the surface of galena, and form a hydration film on the surface of the galena, so that the galena is selectively inhibited. The inhibitor has strong ability to complex lead ions, and can achieve strong inhibition of the galena, and the inhibition performance is stronger than that of potassium dichromate. In addition, compared with the organic inhibitors (carboxymethyl cellulose, humic acid, sodium alginate, etc.) mainly containing carboxyl and hydroxyl, the sulfonic acid group in the inhibitor has stronger action ability with the active sites on the surface of the galena, and cooperates with the carboxyl and hydroxyl rich in the inhibitor to produce synergistic effect, so that the inhibition ability is greatly improved. In addition, compared with the traditional copper-lead separation inhibitor, the inhibitor has excellent performance of strong inhibition and good selectivity. At the same time, it has good water solubility, is cheap to obtain, has small pressure on the environment, and fully meets the requirements of industrial production. Therefore, compared with the traditional copper-lead separation inhibitor, the inhibitor has the significant advantages of being cheap to obtain and having good selective inhibition effect.

[0027] The components of the galena inhibitor (i.e. the copper-lead separation inhibitor) in the application are non-toxic, avoiding the high toxicity of the traditional galena inhibitor dichromate. The inhibitor is rich in carboxyl and sulfonic acid group, and the adsorption effect of the inhibitor on the surface of the galena can be enhanced under the action of the two main groups. The inhibitor in the application can be used under neutral, weak acidic and weak alkaline conditions, has the significant advantages of strong inhibition effect on the galena, strong selectivity (small influence on the flotation of chalcopyrite), easy to obtain and store, and environmental friendliness, and can effectively improve the flotation separation indexes of copper-lead sulfide ore. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 The application process flow chart of the copper-lead separation inhibitor is shown in the figure. DETAILED DESCRIPTION

[0029] In order to make the technical problems, technical solutions and advantages of the application more clear, the following will be described in detail with reference to the drawings and specific embodiments.

[0030] The application provides a copper-lead sulfide ore flotation separation inhibitor, a preparation method and an application method thereof, wherein the copper-lead sulfide ore flotation separation inhibitor is referred to as a copper-lead separation inhibitor.

[0031] The copper-lead separation inhibitor comprises acrylic acid-2-acrylamide-2-methylpropane sulfonic acid copolymer, hydrolyzed polymaleic anhydride, sodium silicate and sodium sulfite, and the mass ratio of acrylic acid-2-acrylamide-2-methylpropane sulfonic acid copolymer, hydrolyzed polymaleic anhydride, sodium silicate and sodium sulfite is 5.5-6.5:1.2-2.2:0.8-1.5:0.8-1.5.

[0032] The preparation method of the copper-lead separation inhibitor comprises the following steps: mixing acrylic acid-2-acrylamide-2-methylpropane sulfonic acid copolymer, hydrolyzed polymaleic anhydride, sodium silicate and sodium sulfite in a proportion at room temperature, and then adding the mixture into a high-shear emulsifier for emulsification and dispersion to obtain a uniform viscous suspension, which is the copper-lead separation inhibitor.

[0033] As Figure 1 The application method of the copper-lead separation inhibitor comprises the following steps:

[0034] (1) adding active carbon and sodium sulfide into copper-lead mixed concentrate and stirring for 10-20 minutes to remove residual reagents on the surface of the mineral, then adding the copper-lead separation inhibitor, stirring for 5 minutes, and then adding collector Z-200 and frother No. 2 oil in sequence to perform copper-lead separation flotation operation, and obtaining copper rough concentrate and lead rough concentrate through rough separation;

[0035] (2) performing three times of cleaning separation on the copper rough concentrate obtained in step (1), and only adding the copper-lead separation inhibitor in the cleaning separation, and the adding amount of the copper-lead separation inhibitor in each cleaning separation is 0.1-0.9 times of the adding amount of the copper-lead separation inhibitor in the rough separation in step (1);

[0036] (3) performing three times of scavenging separation on the lead rough concentrate obtained in step (1), and adding collector Z-200 and frother No. 2 oil in the scavenging separation, and the adding amount of collector Z-200 in each scavenging separation is 0.1-0.7 times of the adding amount of collector Z-200 in the rough separation in step (1), and the adding amount of frother No. 2 oil is 0.1-0.5 times of the adding amount of frother No. 2 oil in the rough separation in step (1), and the scavenging tailings are lead concentrate;

[0037] (4) returning the middlings in the cleaning separation in step (2) and the scavenging separation in step (3) to the previous stage in sequence to form a closed circuit.

[0038] The following will be described in combination with specific examples.

[0039] Example 1:

[0040] The copper-lead separation inhibitor used in the present embodiment is prepared with the mass ratio of acrylic acid-2-acrylamide-2-methylpropane sulfonic acid copolymer, hydrolyzed polymaleic anhydride, sodium silicate and sodium sulfite being 6:2:1:1. The above-mentioned inhibitor is used for the flotation of copper-lead mixed concentrate. In the present embodiment, the copper-lead mixed concentrate contains 11.99% of copper and 35.88% of lead. The copper mainly exists in the form of chalcopyrite and the lead mainly exists in the form of galena.

[0041] The specific steps are as follows:

[0042] (1) The obtained copper-lead mixed concentrate is first stirred with 800 g / t of activated carbon and 700 g / t of sodium sulfide for 15 minutes to remove the mixed flotation reagents remaining on the surface of the minerals, and then stirred with 600 g / t of copper-lead separation inhibitor for 5 minutes. Then 50 g / t of collector Z-200 and 15 g / t of frother No. 2 oil are added, and the action time of the reagents is 3 minutes. After that, the copper roughing is carried out.

[0043] The obtained copper rough concentrate and lead rough concentrate are respectively subjected to the closed-circuit beneficiation process of 3 times of cleaning and 3 times of scavenging, so that the copper concentrate and the lead concentrate are obtained.

[0044] (2) In the cleaning process, the copper-lead separation inhibitor added in the first cleaning is 200 g / t, the copper-lead separation inhibitor added in the second cleaning is 100 g / t, and the copper-lead separation inhibitor added in the third cleaning is 100 g / t. In the scavenging process, the dosage of collector Z-200 in the first scavenging is 10 g / t, the dosage of collector Z-200 in the second scavenging is 15 g / t, and the dosage of collector Z-200 in the third scavenging is 15 g / t. The dosage of frother No. 2 oil in the first scavenging is 5 g / t, the dosage of frother No. 2 oil in the second scavenging is 5 g / t, and the dosage of frother No. 2 oil in the third scavenging is 5 g / t.

[0045] The results of Example 1 are shown in Table 1.

[0046] Table 1, results of Example 1:

[0047]

[0048] As shown in Table 1, the copper-lead mixed concentrate is subjected to the flotation separation by using the copper-lead separation inhibitor in the present embodiment, and good beneficiation indexes can still be obtained at a low dosage. In the laboratory closed-circuit test, the copper concentrate with a copper grade of 26.17% and a recovery rate of 92.10% is obtained, and the copper concentrate contains lead with a grade of 3.77%. The lead concentrate with a lead grade of 59.34% and a recovery rate of 95.57% is obtained, and the lead concentrate contains copper with a grade of 1.64%.

[0049] Example 2:

[0050] The copper-lead separation inhibitor used in the present embodiment is prepared with the mass ratio of acrylic acid-2-acrylamide-2-methylpropane sulfonic acid copolymer, hydrolyzed polymaleic anhydride, sodium silicate and sodium sulfite being 6:2:1:1. The above-mentioned inhibitor is used for the flotation of copper-lead mixed concentrate. In the present embodiment, the copper-lead mixed concentrate contains 8.56% of copper and 43.19% of lead. The copper mainly exists in the form of chalcopyrite and the lead mainly exists in the form of galena.

[0051] The specific steps are as follows:

[0052] (1) The obtained copper-lead mixed concentrate is first stirred with 700g / t of activated carbon and 700g / t of sodium sulfide for 15 minutes to remove the mixed flotation reagents remaining on the surface of the minerals, and then 800g / t of copper-lead separation inhibitor is added and stirred for 5 minutes, and then 50g / t of collector Z-200 and 15g / t of frother No. 2 oil are added, and the action time of the reagents is 3 minutes, and then the copper roughing is carried out.

[0053] The obtained copper rough concentrate and lead rough concentrate are respectively subjected to 3 times of cleaning and 3 times of scavenging in a closed-circuit beneficiation process, and then copper concentrate and lead concentrate are obtained.

[0054] (2) In the cleaning process, 400g / t of copper-lead separation inhibitor is added in the first cleaning, 200g / t of copper-lead separation inhibitor is added in the second cleaning, and 100g / t of copper-lead separation inhibitor is added in the third cleaning. In the scavenging process, the dosage of collector Z-200 in the first scavenging is 10g / t, the dosage of collector Z-200 in the second scavenging is 15g / t, the dosage of collector Z-200 in the third scavenging is 15g / t, the dosage of frother No. 2 oil in the first scavenging is 5g / t, the dosage of frother No. 2 oil in the second scavenging is 5g / t, and the dosage of frother No. 2 oil in the third scavenging is 5g / t.

[0055] Table 2, results of example 2:

[0056]

[0057] As shown in Table 2, the copper-lead mixed concentrate is subjected to flotation separation by using the copper-lead separation inhibitor in the present embodiment, and good beneficiation indexes can still be obtained at a low dosage. In the laboratory closed-circuit test, copper concentrate with a copper grade of 24.78% and a recovery rate of 90.44% is obtained, and the lead grade of the copper concentrate is 3.54%. Lead concentrate with a lead grade of 61.20% and a recovery rate of 97.44% is obtained, and the copper grade of the lead concentrate is 1.19%.

[0058] Example 3:

[0059] The copper-lead separation inhibitor used in the present embodiment is prepared with the mass ratio of acrylic acid-2-acrylamide-2-methylpropane sulfonic acid copolymer, hydrolyzed polymaleic anhydride, sodium silicate and sodium sulfite being 6:2:1:1. The above-mentioned inhibitor is used for the flotation of copper-lead mixed concentrate. In the present embodiment, the copper-lead mixed concentrate contains 10.26% of copper and 39.63% of lead. The copper mainly exists in the form of chalcopyrite and chalcocite, and the lead mainly exists in the form of galena.

[0060] The specific steps are as follows:

[0061] (1) The obtained copper-lead mixed concentrate is first stirred with 600 g / t of activated carbon and 600 g / t of sodium sulfide for 15 minutes to remove the mixed flotation reagents remaining on the surface of the minerals, then 700 g / t of copper-lead separation inhibitor is added and stirred for 5 minutes, and then 50 g / t of collector Z-200 and 15 g / t of frother No. 2 oil are added, and the action time of the reagents is 3 minutes, and then the copper roughing is carried out.

[0062] The obtained copper rough concentrate and lead rough concentrate are respectively subjected to a closed-circuit beneficiation process of 3 times of cleaning and 3 times of scavenging, so as to obtain copper concentrate and lead concentrate.

[0063] (2) In the cleaning process, 300 g / t of copper-lead separation inhibitor is added in the first cleaning, 200 g / t of copper-lead separation inhibitor is added in the second cleaning, and 100 g / t of copper-lead separation inhibitor is added in the third cleaning. In the scavenging process, the dosage of collector Z-200 in the first scavenging is 10 g / t, the dosage of collector Z-200 in the second scavenging is 15 g / t, the dosage of collector Z-200 in the third scavenging is 15 g / t, the dosage of frother No. 2 oil in the first scavenging is 5 g / t, the dosage of frother No. 2 oil in the second scavenging is 5 g / t, and the dosage of frother No. 2 oil in the third scavenging is 5 g / t.

[0064] Table 3, results of example 3:

[0065]

[0066] As shown in Table 3, the copper-lead mixed concentrate is subjected to flotation separation by using the copper-lead separation inhibitor in the present embodiment, and good beneficiation indexes can still be obtained at a low dosage. In the laboratory closed-circuit test, copper concentrate with a copper grade of 27.34% and a recovery rate of 91.82% can be obtained, and the lead grade of the copper concentrate is 3.83%. Lead concentrate with a lead grade of 58.43% and a recovery rate of 96.67% can be obtained, and the copper grade of the lead concentrate is 1.28%.

[0067] Example 4:

[0068] The copper-lead separation inhibitor used in the present embodiment is prepared with the mass ratio of acrylic acid-2-acrylamide-2-methylpropane sulfonic acid copolymer, hydrolyzed polymaleic anhydride, sodium silicate and sodium sulfite being 6.5:1.2:0.8:1.5. The above-mentioned inhibitor is used for the flotation of copper-lead mixed concentrate. In the present embodiment, the copper-lead mixed concentrate contains 14.05% of copper and 30.32% of lead. The copper mainly exists in the form of chalcopyrite and chalcocite, and the lead mainly exists in the form of galena.

[0069] The specific steps are as follows:

[0070] (1) The obtained copper-lead mixed concentrate is first stirred with 500 g / t of activated carbon and 1000 g / t of sodium sulfide for 10 minutes to remove the mixed flotation reagents remaining on the surface of the minerals, and then 1200 g / t of copper-lead separation inhibitor is added and stirred for 5 minutes, and then 100 g / t of collector Z-200 and 30 g / t of frother No. 2 oil are added, and the action time of the reagents is 3 minutes, and then the copper roughing is carried out.

[0071] The obtained copper rough concentrate and lead rough concentrate are respectively subjected to 3 times of cleaning and 3 times of scavenging in a closed-circuit beneficiation process, and then the copper concentrate and the lead concentrate are obtained.

[0072] (2) In the cleaning process, 1080 g / t of copper-lead separation inhibitor is added in the first cleaning, 600 g / t of copper-lead separation inhibitor is added in the second cleaning, and 120 g / t of copper-lead separation inhibitor is added in the third cleaning. In the scavenging process, the dosage of collector Z-200 is 10 g / t in the first scavenging, 15 g / t in the second scavenging, and 15 g / t in the third scavenging; the dosage of frother No. 2 oil is 15 g / t in the first scavenging, 9 g / t in the second scavenging, and 3 g / t in the third scavenging.

[0073] Table 4, results of Example 4:

[0074]

[0075]

[0076] As shown in Table 4, the copper-lead mixed concentrate is subjected to flotation separation by using the copper-lead separation inhibitor in the present embodiment, and good beneficiation indexes can still be obtained at a low dosage. In the laboratory closed-circuit test, a copper concentrate with a copper grade of 27.15% and a recovery rate of 95.00% is obtained, and the lead grade of the copper concentrate is 1.35%. A lead concentrate with a lead grade of 58.33% and a recovery rate of 97.81% is obtained, and the copper grade of the lead concentrate is 1.38%.

[0077] Example 5:

[0078] The copper-lead separation inhibitor used in the present embodiment is prepared with the mass ratio of acrylic acid-2-acrylamide-2-methylpropane sulfonic acid copolymer, hydrolyzed polymaleic anhydride, sodium silicate and sodium sulfite being 5.5:2.2:1.5:0.8. The above-mentioned inhibitor is used for the flotation of copper-lead mixed concentrate. In the present embodiment, the copper-lead mixed concentrate contains 11.81% of copper and 32.90% of lead. The copper mainly exists in the form of chalcopyrite and chalcocite, and the lead mainly exists in the form of galena.

[0079] The specific steps are as follows:

[0080] (1) The obtained copper-lead mixed concentrate is first stirred with 1200g / t of activated carbon and 500g / t of sodium sulfide for 20 minutes to remove the mixed flotation reagents remaining on the surface of the minerals, then 500g / t of copper-lead separation inhibitor is added and stirred for 5 minutes, and then 75g / t of collector Z-200 and 50g / t of frother No. 2 oil are added, and the action time of the reagents is 3 minutes, after which the copper roughing is carried out.

[0081] The obtained copper rough concentrate and lead rough concentrate are respectively subjected to a closed-circuit beneficiation process of 3 times of cleaning and 3 times of scavenging, so as to obtain copper concentrate and lead concentrate.

[0082] (2) In the cleaning process, the copper-lead separation inhibitor added in the first cleaning is 450g / t, the copper-lead separation inhibitor added in the second cleaning is 250g / t, and the copper-lead separation inhibitor added in the third cleaning is 50g / t. In the scavenging process, the dosage of collector Z-200 in the first scavenging is 53g / t, the dosage of collector Z-200 in the second scavenging is 30g / t, the dosage of collector Z-200 in the third scavenging is 7.5g / t, the dosage of frother No. 2 oil in the first scavenging is 25g / t, the dosage of frother No. 2 oil in the second scavenging is 15g / t, and the dosage of frother No. 2 oil in the third scavenging is 5g / t.

[0083] Table 5, results of Example 5:

[0084]

[0085] As shown in Table 5, the copper-lead mixed concentrate is subjected to flotation separation by using the copper-lead separation inhibitor in the present embodiment, and good beneficiation indexes can still be obtained at a low dosage. In the laboratory closed-circuit test, copper concentrate with a copper grade of 26.87% and a recovery rate of 95.02% is obtained, and the lead grade of the copper concentrate is 1.79%. Lead concentrate with a lead grade of 55.23% and a recovery rate of 97.73% is obtained, and the copper grade of the lead concentrate is 1.01%.

[0086] The above is the preferred embodiment of the present application. It should be noted that those skilled in the art can make some improvements and refinements without departing from the principles of the present application, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A process for the preparation of a copper-lead separation depressant characterized by, The application relates to a copper-lead separation inhibitor. The acrylic acid-2-acrylamide-2-methylpropane sulfonic acid copolymer, the hydrolyzed polymaleic anhydride, the sodium silicate and the sodium sulfite are mixed in proportion, and then are added into a high-shear emulsifying machine to be emulsified and dispersed, so that a uniform viscous suspension is obtained, that is, the copper-lead separation inhibitor, wherein the rotating speed of the high-shear emulsifying machine is not less than 6000 rpm, and the emulsifying and dispersing time is 20 minutes.

2. The process for preparing a copper-lead separation depressant according to claim 1, characterized in that, The mass ratio of the acrylic acid-2-acrylamide-2-methylpropane sulfonic acid copolymer, the hydrolyzed polymaleic anhydride, the sodium silicate and the sodium sulfite is 6:2:1:

1.

3. A method of using the copper-lead separation depressant prepared according to claim 1, characterized in that, The application relates to a copper-lead separation inhibitor. Step 1: active carbon and sodium sulfide are added into copper-lead mixed concentrate, stirring is carried out, then copper-lead separation inhibitor is added, stirring is carried out, then collector Z-200 and foaming agent No. 2 oil are sequentially added to carry out copper-lead separation flotation operation, and copper rough concentrate and lead rough concentrate are obtained through rough separation; Step 2: the copper rough concentrate obtained is subjected to three times of cleaning, and the copper-lead separation inhibitor is added in the cleaning process; Step 3: the lead rough concentrate obtained is subjected to three times of scavenging, and the collector Z-200 and the foaming agent No. 2 oil are added in the scavenging process, and the scavenging tailings are lead concentrate; Step 4: the middlings in the cleaning in step 2 and the scavenging in step 3 are sequentially returned to the previous stage to form a closed circuit.

4. The method of using a copper-lead separation inhibitor according to claim 3, wherein In step 1, the active carbon and the sodium sulfide are added into the copper-lead mixed concentrate, stirring is carried out for 10-20 minutes, then the copper-lead separation inhibitor is added, and stirring is carried out for 5 minutes.

5. The method of using a copper-lead separation depressant according to claim 3, wherein In step 1, the amount of the active carbon is 500-1200 g / t, the amount of the sodium sulfide is 500-1000 g / t, the amount of the copper-lead separation inhibitor is 500-1200 g / t, the amount of the collector Z-200 is 50-100 g / t, and the amount of the foaming agent No. 2 oil is 15-50 g / t.

6. The method of using a copper-lead separation depressant according to claim 3, wherein In step 2, the amount of the copper-lead separation inhibitor added in each cleaning is 0.1-0.9 times that of the copper-lead separation inhibitor added in step 1.

7. The method of using a copper-lead separation depressant according to claim 3, wherein In step 3, the amount of the collector Z-200 added in each scavenging is 0.1-0.7 times that of the collector Z-200 added in step 1, and the amount of the foaming agent No. 2 oil added in each scavenging is 0.1-0.5 times that of the foaming agent No. 2 oil added in step 1.

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