A method for reducing the content of sericite in porphyry copper tailings

Abstract

The present application relates to the technical field of ore dressing, and in particular to a method for reducing the content of sericite in porphyry copper tailings. The method comprises the following steps: performing gravity separation grading operation on the porphyry copper tailings to obtain coarse-grained products and fine-grained products; feeding the fine-grained products into a magnetic separation operation to remove ferromagnetic minerals; performing multi-pass flotation operation on the high-intensity magnetic tailings to remove sulfide minerals; adjusting the pulp concentration and pH of the obtained desulfurization flotation tailings and feeding them into a reverse flotation operation, and the reverse flotation tailings are sericite products; the present application is aimed at the problem of high content of micro-fine-grained sericite in porphyry copper tailings dams, which increases the risk of dam collapse. The present application adopts a combined process of gravity separation-magnetic separation-desulfurization flotation-reverse flotation, the recovery rate of sericite in copper tailings is 26%-30%, the content of sericite in tailings is greatly reduced, and the safety of the dam body is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ore dressing, in particular to a method for reducing the content of sericite in porphyry copper tailings. BACKGROUND

[0002] Porphyry copper mine is the main type of copper mine in China, and the annual discharge of copper tailings reaches several million tons. Discharging a large amount of tailings not only occupies a large area, but also has a great risk of environmental pollution. However, the porphyry copper tailings contain a large amount of sericite, quartz and other minerals. Among them, sericite is the main mineral affecting the safety of tailings dam due to its fine particle size and strong fluidity.

[0003] Sericite is a kind of mica, which has many characteristics of mica and clay minerals, such as good wear resistance and abrasion resistance, heat resistance, insulation, difficult to dissolve in acid and alkali solution, and stable chemical properties. Sericite has a very wide range of applications, such as rubber, plastic, paint, paint, ceramic, insulation, cosmetics, pigment, papermaking, metallurgy and other industries. At present, there is no report on the recovery of sericite in tailings, and the sericite in tailings is basically not recovered.

[0004] Due to the small hardness and fine particle size of sericite, it is often associated with quartz, feldspar and other minerals, and the density is relatively close, and it is mostly in the form of sheet or block. The enrichment ratio of the tailings is small by using gravity separation, classification and other processes. The commonly used acid cation sericite direct flotation process has the problems of large amount of reagent, unsatisfactory beneficiation index, great environmental pressure, and is not suitable for high mud content ore and other problems, which brings difficulties to the comprehensive utilization of sericite in copper tailings. Although some existing combined processes realize the enrichment of sericite in tailings, the product quality is generally low, which affects the application and sales price of sericite products.

[0005] Therefore, finding a method for recovering sericite in tailings dam not only helps to improve the comprehensive utilization rate of porphyry copper tailings, reduce the land occupation area of tailings pond, and prolong the service life of tailings pond, but also provides some non-metallic mineral raw materials for industrial development. SUMMARY

[0006] The purpose of the present application is to provide a method for reducing the content of sericite in porphyry copper tailings, which adopts a combined process of gravity separation-magnetic separation-desulfurization flotation-reverse flotation to improve the recovery rate of sericite, improve the product quality, reduce the beneficiation cost of sericite, and avoid the environmental problems of the conventional acid direct flotation process. The content of fine particle size sericite in tailings dam is effectively reduced, and the stability of the dam body is improved.

[0007] In order to achieve the above purpose of the present application, the technical scheme of the present application is as follows: a method for reducing the content of sericite in porphyry copper tailings, which specifically comprises the following steps:

[0008] S1) performing a gravity separation operation on the porphyry copper tailings to obtain a coarse fraction product and a fine fraction product;

[0009] S2) performing a magnetic separation operation on the fine fraction product obtained in S1);

[0010] S3) performing a multi-stage flotation operation on the high-intensity magnetic tailings obtained in S2) to remove sulfide minerals;

[0011] S4) performing a reverse flotation operation on the desulfurized flotation tailings obtained in S3) after adjusting the pulp concentration and pH, and the obtained reverse flotation tailings are the sericite product.

[0012] Further, the gravity separation operation in S1) has the following specific process:

[0013] The proportion of particles with a particle size of -0.074 mm in the material is 60%-65%, the cyclone pressure is 0.04-0.08 MPa, and the proportion of -0.074 mm particles in the cyclone overflow is 90%-95%;

[0014] Further, the magnetic separation operation in S2) has the following specific process:

[0015] The magnetic separation medium is a network medium, and the magnetic field strength is 5000-8000 Tesla.

[0016] Further, the specific process of S3) is as follows:

[0017] S3.1) first adjusting the pulp concentration of the high-intensity magnetic tailings obtained in S2), and then adjusting the pH value;

[0018] S3.2) performing a flotation desulfurization operation on the high-intensity magnetic tailings pulp treated in S3.1), including one roughing, two cleaning, and two scavenging, to remove sulfur-containing impurities in the magnetic tailings pulp.

[0019] Further, the pulp concentration value in S3.1) is adjusted to 30-35, and the pH value is adjusted to 6-7;

[0020] The addition amount of the composite sulfide collector in the roughing in S3.2) is 120-210 g / t;

[0021] The addition amount of the frother for flotation desulfurization is 80-100 g / t;

[0022] The addition amount of the composite sulfide collector in the scavenging is 50-80 g / t.

[0023] Further, the composite sulfide collector includes butyl xanthate and modified mercaptan, and the mass ratio between the two is 1-2:0.2-0.5;

[0024] The foaming agent is 2# oil;

[0025] Further, the specific process of S4) is:

[0026] S4.1) first adjust the concentration of the slurry obtained in S3), and then adjust the pH value;

[0027] S4.2) add a certain amount of dispersant, activator and collector to the tailing slurry treated in S4.1), and mix uniformly;

[0028] S4.3) perform reverse flotation operation of once roughing, twice cleaning and twice scavenging on the tailing slurry treated in S4.2), and the reverse flotation tailing is the sericite product.

[0029] Further, the concentration of the slurry is adjusted to 30-35% in S4.1), and the pH value of the slurry is adjusted to 10-12;

[0030] The adding amount of the dispersant in S4.2) is 300g / t-500g / t, the adding amount of the activator is 100g / t-400g / t, and the adding amount of the collector is 400g / t-700g / t.

[0031] Further, the dispersant is sodium carbonate or sodium hexametaphosphate;

[0032] The activator is one or more of Ca 2+ , Mg 2+ , Al 3+ , Ba 2+ , Pb 2+ , Fe 2+ , Fe 3+ .

[0033] The collector is a mixture of dodecyl primary amine and sodium fatty acid, and the mass ratio between the two is 1:0.15-0.25.

[0034] A sericite concentrate prepared by the above method.

[0035] The beneficial effects of the present application are:

[0036] The method for reducing the content of sericite in tailing dam provided by the present application adopts the process of combining gravity separation grading, strong magnetic separation iron removal, flotation desulfurization and sericite reverse flotation, and obtains sericite concentrate with good quality from porphyry copper tailings, the Al2O3 content in the sericite concentrate is >25%, the SiO2 content is >48%, and the K2O content is >6%, which exceeds the requirements of the first grade sericite in the national standard.

[0037] The sericite reverse flotation in the process adopts alkaline ore slurry, has strong adaptability, the backwater is the same as the backwater of the copper ore dressing plant, the backwater of the whole plant is universal, and no waste water can be discharged. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 A flowchart of a method for reducing the content of sericite in porphyry copper tailings. DETAILED DESCRIPTION

[0039] The technical solutions of the present application will be described clearly and completely in combination with specific embodiments, but those skilled in the art will understand that the following described embodiments are part of the embodiments of the present application, not all the embodiments, and are only used to illustrate the present application, and should not be regarded as limiting the scope of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application. If the specific conditions are not specified in the embodiments, the conventional conditions or the conditions recommended by the manufacturer are used. If the reagents or instruments used are not specified by the manufacturer, they are all conventional products that can be purchased on the market.

[0040] In some embodiments of the present application, a method for reducing the content of sericite in tailings dam is provided, comprising the following steps:

[0041] As shown in Figure 1 A method for reducing the content of sericite in porphyry copper tailings, comprising the following steps:

[0042] S1, using gravity separation grading on porphyry copper tailings to obtain coarse-grained products and fine-grained products, the coarse-grained products can be used as dam building materials of tailings dam, and the fine-grained part contains more sericite minerals, which can be fed to subsequent operations;

[0043] The proportion of particles with a particle size of-0.074 mm in the material is 60%-65%, the cyclone pressure is 0.04Mpa-0.08Mpa, and the proportion of particles with a particle size of-0.074 mm in the overflow of the cyclone is 90%-95%;

[0044] S2, performing strong magnetic separation iron removal operation on the fine-grained products obtained by gravity separation to remove high-iron-containing minerals;

[0045] S3, mixing collectors, depressants and frothers after adjusting the pulp concentration and pH of the strong magnetic separation tailings in S2, and performing one roughing, two cleaning and two scavenging flotation desulfurization operation to remove sulfur impurities;

[0046] The flotation desulfurization test adopts a complex reagent as a sulfide collector, the complex reagent is a mixture of butyl xanthate as a main component and modified mercaptan as an auxiliary component, the reagent ratio is 1-2:0.2-0.5, the roughing collector is 120g / t-210g / t, the foaming agent for floating sulfur is a self-made foaming agent, and the dosage is 80-100g / t, and the scavenging collector is 50g / t-80g / t.

[0047] S4, after adjusting the concentration and pH of the desulfurization flotation tailings obtained in S3, the desulfurization flotation tailings are subjected to a reverse flotation operation of once roughing, twice cleaning and twice scavenging, and the reverse flotation tailings are the sericite product; sodium hydroxide (4000g / t-7000g / t) is used to adjust the pH of the slurry, sodium carbonate (300g / t-500g / t) is used as a dispersant to disperse the slurry, sodium hexametaphosphate (90g / t-180g / t) is used as an inhibitor and dispersant, calcium chloride (100g / t-400g / t) is used to activate quartz, and a reverse flotation collector (400g / t-700g / t) is used to collect gangue minerals such as quartz.

[0048] In the step S1, in the gravity separation operation of the porphyry copper tailings, a spiral chute, a cyclone or other gravity separation equipment is preferably used.

[0049] In the step S2, the magnetic separation medium of the high-intensity magnetic separator is a mesh medium, and the magnetic field strength is 5000-8000 Tesla.

[0050] In the step S4, the following should be included:

[0051] (1) adjusting the pH of the slurry to 10-12;

[0052] (2) the activator is one or more of Ca 2+ , Mg 2+ , Al 3+ , Ba 2+ , Pb 2+ , Fe 2+ , Fe 3+ ;

[0053] (3) the collector for quartz and carbonates in the reverse flotation process is a mixture of dodecyl primary amine and sodium fatty acid;

[0054] Example 1

[0055] The present application provides a method for reducing the content of sericite in porphyry copper tailings, comprising the following steps:

[0056] S1, the porphyry copper tailings are subjected to gravity separation grading to obtain coarse-grained products and fine-grained products, the coarse-grained products can be used as dam building materials for tailings dams, and the fine-grained part contains more sericite minerals, which can be subjected to subsequent operations;

[0057] The proportion of particles with a particle size of -0.074 mm in the material is 65%, the cyclone pressure is 0.08 Mpa, and the proportion of particles with a particle size of -0.074 mm in the overflow of the cyclone is 95%;

[0058] S2, the fine particle product obtained by gravity separation is subjected to a strong magnetic separation iron removal operation, and a mineral with a high iron content is removed, the magnetic separation medium of the strong magnetic separator is a mesh medium, and the magnetic field strength is 5000 tesla.

[0059] S3, after the strong magnetic separation tailings in S2 are adjusted to a pulp concentration of 35% and a pH of 6, a mixed collector, a depressor and a foaming agent are mixed, and a flotation desulfurization operation of one roughing, two cleaning and two scavenging is carried out to remove a sulfur impurity mineral;

[0060] In the flotation desulfurization test, a compound reagent of butyl xanthate as the main component and modified mercaptan as the auxiliary component is used as a sulfide collector, the reagent ratio is 1:0.2, the roughing collector is 210g / t, the sulfur flotation foaming agent is a self-made foaming agent 1#, and the dosage is 100g / t, and the scavenging collector is 80g / t.

[0061] S4, after the desulfurization flotation tailings obtained in S3 are adjusted to a pulp concentration of 35% and a pulp pH of 11 by using 7000g / t of sodium hydroxide, a reverse flotation operation of one roughing, two cleaning and two scavenging is carried out, and the reverse flotation tailings are the sericite product, a dispersing agent sodium carbonate 500g / t is added to disperse the pulp in the roughing, sodium hexametaphosphate 180g / t is used as a depressor and a dispersing agent, magnesium chloride and ferrous chloride are prepared according to a ratio of 1:1, the dosage is 400g / t to activate quartz, and a reverse flotation collector 700g / t is used to collect quartz and other gangue minerals.

[0062] The reverse flotation collector is composed of dodecyl primary amine and sodium fatty acid at a ratio of 1:0.3.

[0063] Example 2

[0064] The application provides a method for reducing the content of sericite in porphyry copper tailings, which comprises the following steps:

[0065] S1, the porphyry copper tailings are subjected to gravity separation grading to obtain coarse particle products and fine particle products, the coarse particle products can be used as dam building materials for tailings dams, and the fine particle products contain more sericite minerals and can be fed to subsequent operations;

[0066] The proportion of particles with a particle size of -0.074 mm in the material is 62%, the cyclone pressure is 0.06 Mpa, and the proportion of particles with a particle size of -0.074 mm in the overflow of the cyclone is 92%;

[0067] S2, the fine particle level product obtained by gravity separation is subjected to strong magnetic separation iron removal operation, and high-iron-containing minerals are removed, and the magnetic separation medium of the strong magnetic separator is a mesh medium, and the magnetic field strength is 8000 tesla.

[0068] S3, after adjusting the pulp concentration of the strong magnetic separation tailings in S2 to 28% and the pH to 6.5, mixing a collector, a depressor and a frother, performing a once roughing, twice cleaning and twice scavenging flotation desulfurization operation, and removing sulfur-containing impurities;

[0069] In the flotation desulfurization test, a compound reagent of butyl xanthate as the main component and modified mercaptan as the auxiliary component is used as the sulfide collector, the reagent ratio is 1:0.5, the roughing collector is 200g / t, the sulfur flotation frother is a self-made frother 1#, and the dosage is 80g / t, and the scavenging collector is 85g / t.

[0070] S4, after adjusting the pulp concentration of the desulfurization flotation tailings in S3 to 32% and adjusting the pulp pH to 11.5 by using sodium hydroxide 6500g / t, the reverse flotation operation of once roughing, twice cleaning and twice scavenging is performed, and the reverse flotation tailings are the sericite product, the roughing adds a dispersant sodium carbonate 450g / t to disperse the pulp, sodium hexametaphosphate 150g / t as a depressor and dispersant, calcium chloride and lead chloride are prepared according to 1:2, the dosage is 350g / t to activate quartz, and the reverse flotation collector 560g / t collects gangue minerals such as quartz.

[0071] In the reverse flotation collector, the reverse flotation collector is composed of dodecyl primary amine and sodium fatty acid 1:0.25.

[0072] Example 3

[0073] The application provides a method for reducing the content of sericite in porphyry copper tailings, comprising the following steps:

[0074] S1, the porphyry copper tailings are subjected to gravity separation grading to obtain coarse particle level product and fine particle level product, the coarse particle product can be used as dam building raw material of tailings dam, and the fine particle part contains more sericite minerals and can be fed to subsequent operation;

[0075] The proportion of particles with a particle size of-0.074mm in the material is 60%, the cyclone pressure is 0.05Mpa, and the proportion of particles with a particle size of-0.074mm in the cyclone overflow is 90%;

[0076] S2, the fine particle level product obtained by gravity separation is subjected to strong magnetic separation iron removal operation, and high-iron-containing minerals are removed, and the magnetic separation medium of the strong magnetic separator is a mesh medium, and the magnetic field strength is 7800 tesla.

[0077] S3, after the strong magnetic separation tailings in S2 are adjusted to a pulp concentration of 30% and a pH of 7.5, mixed collector, depressor and frother are mixed, and a flotation desulfurization operation of one roughing, two cleaning and two scavenging is carried out, and the sulfur impurity minerals are removed;

[0078] In the flotation desulfurization test, butyl xanthate is used as the main reagent, modified mercaptan is used as the auxiliary reagent, the reagent ratio is 1.3:0.5, the roughing collector is 180g / t, the froth sulfur frother is self-made frother 1#, and the dosage is 90g / t, and the scavenging collector is 65g / t.

[0079] S4, after the desulfurization flotation tailings in S3 are adjusted to a pulp concentration of 32% and a pulp pH of 11 by adding 5500g / t of sodium hydroxide, a reverse flotation operation of one roughing, two cleaning and two scavenging is carried out, and the reverse flotation tailings are the sericite product, the roughing adds dispersant sodium carbonate 300g / t to disperse the pulp, sodium hexametaphosphate 120g / t as depressor and dispersant, aluminum chloride and barium chloride are prepared according to 2:1, the dosage is 100g / t to activate quartz, and the reverse flotation collector is 400g / t to collect quartz and other gangue minerals.

[0080] In the reverse flotation collector, the composition is dodecyl primary amine and sodium fatty acid 1:0.

[0081] Example 4

[0082] The application provides a method for reducing the content of sericite in porphyry copper tailings, comprising the following steps:

[0083] S1, the porphyry copper tailings are classified by gravity separation to obtain coarse-grained products and fine-grained products, the coarse-grained products can be used as dam materials for tailings dam, and the fine-grained products contain more sericite minerals and can be fed to subsequent operations;

[0084] The proportion of particles with a particle size of-0.074mm in the material is 65%, the cyclone pressure is 0.04Mpa, and the proportion of particles with a particle size of-0.074mm in the cyclone overflow is 90%;

[0085] S2, the fine-grained products obtained by gravity separation are subjected to strong magnetic separation for iron removal, and the high-iron-containing minerals are removed, the magnetic separation medium of the strong magnetic separator is a mesh medium, and the magnetic field strength is 6800T.

[0086] S3, after the strong magnetic separation tailings in S2 are adjusted to a pulp concentration of 30% and a pH of 7.5, mixed collector, depressor and frother are mixed, and a flotation desulfurization operation of one roughing, two cleaning and two scavenging is carried out, and the sulfur impurity minerals are removed;

[0087] The flotation desulfurization test uses a complex reagent of butyl xanthate as the main agent and modified mercaptan as the auxiliary agent as the sulfide collector, the reagent ratio is 1.5:0.5, the roughing collector is 160 g / t, the sulfur flotation frother is a self-made frother, and the dosage is 80 g / t, and the scavenging collector is 50 g / t.

[0088] S4, after the desulfurization flotation tailings adjustment slurry concentration 33% and using sodium hydroxide 4000 g / t to adjust the slurry pH to 11, input the reverse flotation operation of once roughing, twice cleaning and twice scavenging, the reverse flotation tailings are the sericite product, the roughing adds dispersant sodium carbonate 350 g / t to disperse the slurry, sodium hexametaphosphate 90 g / t as the depressor and dispersant, ferric chloride 150 g / t to activate quartz, and reverse flotation collector 500 g / t to collect quartz and other gangue minerals.

[0089] The reverse flotation collector is composed of dodecyl primary amine and sodium fatty acid 1:0.15.

[0090] Comparative Example 1

[0091] The comparative example provides a method for reducing the content of sericite in tailings dam according to Example 1, the difference is only that in step S4, the collector is octadecylamine.

[0092] Comparative Example 2

[0093] The comparative example provides a method for reducing the content of sericite in porphyry copper tailings according to Example 1, the difference is only that in step S4, the collector is sodium oleate.

[0094] Comparative Example 3

[0095] The comparative example provides a method for reducing the content of sericite in tailings dam according to Example 1, the difference is only that in step S4, the collector is dodecylamine hydrochloride.

[0096] Test Example 1

[0097] In the method for reducing the content of sericite in porphyry copper tailings in Examples 1-4, the recovery rate and average grade are shown in Table 1.

[0098]

[0099]

[0100] The above describes in detail the method for reducing the content of sericite in the porphyry copper tailings provided by the embodiments of the present application. The above description of the embodiments is only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation manners and application ranges can be changed, and the above description of the specification should not be understood as a limitation on the present application.

[0101] As used in the specification and claims, certain terminology is used to describe certain components. Those of ordinary skill in the art will understand that different manufacturers can refer to the same component by different names. The specification and claims should not be controlled based on a difference in naming alone, but rather based on the difference in functionality. As used throughout the specification and claims, "comprise" or "comprising" is an open term that should be interpreted as "including but not limited to." "Approximately" means within an acceptable error range for the corresponding function, within which those of ordinary skill in the art would understand the technology to function for the intended purpose. The subsequent description in the specification is a preferred embodiment of implementing the present application, and the description is for the purpose of illustrating the general principles of the present application, and is not intended to limit the scope of the present application. The scope of protection of the present application is defined by the appended claims.

[0102] It should also be noted that the terms "comprise", "comprising", or any other variant thereof are intended to cover a non-exclusive inclusion, such that a product or system that comprises a list of elements does not only include those elements, but can also include other elements not expressly listed, or inherent to such product or system. Without more limitations, the element defined by the phrase "comprising a" does not exclude the presence of additional identical elements in the product or system that includes the element.

[0103] It should be understood that the term "and / or" used herein is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0104] The above description shows and describes several preferred embodiments of the present application, but as mentioned above, it should be understood that the present application is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified by the above teaching or related art or knowledge within the scope of the application conceived. Any modification and change made by those skilled in the art without departing from the spirit and scope of the present application should be within the scope of the appended claims of the present application.

Claims

1. A method of reducing the content of sericite in a porphyry copper tailing, characterized by, The method specifically comprises the following steps: S1) performing a gravity separation operation on the porphyry copper tailings to obtain coarse-grained products and fine-grained products; S2) feeding the fine-grained products obtained in S1) into a magnetic separation operation; S3) performing a multi-stage flotation operation on the high-intensity magnetic tailings obtained in S2) to remove sulfide minerals; S4) feeding the desulfurized flotation tailings obtained in S3) into a reverse flotation operation after adjusting the pulp concentration and pH value, and the obtained flotation tailings are sericite concentrate; The specific process is: S4.1) first adjusting the pulp concentration of the slurry obtained in S3), and then adjusting the pH value; The pulp concentration is adjusted to 30-35%, and the pulp pH value is adjusted to 10-12; S4.2) adding a certain amount of dispersant, activator and collector to the tailings slurry treated in S4.1) and mixing uniformly; The addition amount of the dispersant is 300g / t-500g / t, the addition amount of the activator is 100g / t-400g / t, and the addition amount of the collector is 400g / t-700g / t; The dispersant is sodium carbonate or sodium hexametaphosphate; The activator is one or several of Ca 2+ , Mg 2+ , Al 3+ , Ba 2+ , Pb 2+ , Fe 2+ , Fe 3+ . The collector is a mixture of dodecyl primary amine and sodium fatty acid, and the mass ratio between the two is 1:0.15-0.25; S4.3) performing a reverse flotation operation of one roughing, two cleanings and two scavengings on the tailings slurry treated in S4.2), and the reverse flotation tailings are sericite products.

2. The method of claim 1, wherein, The specific process of the gravity separation operation in S1) is: The proportion of particles with a particle size of-0.074mm in the porphyry copper tailings is 60%-65%, the cyclone pressure is 0.04Mpa-0.08Mpa, and the proportion of-0.074mm particles in the cyclone overflow is 90%-95%.

3. The method of claim 1, wherein, The specific process of the magnetic separation operation in S2) is: The magnetic separation medium is a network medium, and the magnetic field strength is 5000-8000 Tesla.

4. The method of claim 1, wherein, The specific process of S3) is: S3.1) first adjusting the pulp concentration of the high-intensity magnetic tailings obtained in S2), and then adjusting the pH value; S3.2) performing a flotation desulfurization operation of one roughing, two cleanings and two scavengings on the high-intensity magnetic tailings slurry treated in S3.1) to remove sulfur impurities in the magnetic tailings slurry.

5. The method of claim 4, wherein, The pulp concentration in S3.1) is adjusted to 30-35, and the pH value is adjusted to 6-7; The addition amount of the composite sulfide collector in the one roughing in S3.2) is 120g / t-210g / t; The addition amount of the frother for flotation desulfurization is 80-100g / t; The addition amount of the composite sulfide collector in the scavenging is 50g / t-80g / t.

6. The method of claim 5, wherein, The composite sulfide collector includes butyl xanthate and modified mercaptan, and the mass ratio between the two is 1-2:0.2-0.5; The frother is 2# oil.

7. A sericite concentrate characterized in that, The sericite concentrate is prepared by the method of any one of claims 1-6.

Images