Method for reducing sericite content in porphyry type copper tailings

Abstract

The invention relates to the technical field of mineral separation, in particular to a method for reducing the content of sericite in porphyry type copper tailings. The method specifically comprises the following steps that reselection grading operation is conducted on the porphyry type copper tailings, and a coarse-fraction product and a fine-fraction product are obtained; the reselected fine-fraction product is fed into magnetic separation operation to remove ferromagnetic minerals; performing multi-channel flotation operation on the strong magnetic tailings to remove sulfide minerals; the obtained desulfurized flotation tailings are fed into reverse flotation operation after the ore pulp concentration and the pH value are adjusted, and the reverse flotation tailings are sericite products; in order to solve the problems that the content of micro-fine particle sericite in the porphyry type copper tailing dam is high, and the dam break risk hidden danger is increased, the reselection-magnetic separation-desulfurization flotation-reverse flotation combined process is adopted, the recovery rate of the sericite in the copper tailings is 26%-30%, the content of the sericite in the tailings is greatly reduced, and the safety of the dam body is improved.

Description

Technical Field

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

[0002] Porphyry copper mines are the main type of copper mines in my country. The amount of copper tailings discharged each year is more than tens of millions of tons. The discharge of a large amount of tailings not only occupies a large area, but also poses a great risk of environmental pollution. However, porphyry copper tailings contain a large amount of minerals such as sericite and quartz. Among them, sericite is the main mineral that affects the safety of tailings dams due to its fine particle size and strong fluidity.

[0003] Sericite is a type of mica, which has many characteristics of mica minerals and clay minerals, such as good wear resistance and abrasion resistance, heat resistance and insulation, poor solubility in acid and alkali solutions, stable chemical properties, etc. Sericite has a wide range of uses, and is used in rubber, plastics, coatings, paints, ceramics, insulation, cosmetics, pigments, papermaking, metallurgy and other industries. At present, there is no report on the recovery of sericite in mineral processing tailings, and sericite in tailings has basically not been recovered.

[0004] Since sericite has low hardness and fine particle size, coexists with minerals such as quartz and feldspar, and has a relatively close density, and is mostly in the form of flakes or blocks, its mineral concentration ratio is small when using gravity separation, classification and other processes; the commonly used acidic cation sericite positive flotation process has problems such as large dosage of reagents, unsatisfactory mineral processing indicators, great environmental pressure, and unsuitability for ores with high mud content, all of which bring difficulties to the comprehensive utilization of sericite in copper tailings; although some existing combined processes have achieved the enrichment of sericite in tailings, there is a problem of generally low product quality, which affects the application and selling price of sericite products.

[0005] Therefore, finding a method to recover sericite from tailings dams is not only beneficial to improving the comprehensive utilization rate of resources of porphyry copper tailings, reducing the footprint of tailings ponds, and extending the service life of tailings ponds, but also can provide some non-metallic mineral raw materials for industrial development. Summary of the invention

[0006] The purpose of the present invention 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 and reverse flotation to improve the recovery rate of sericite, improve product quality, reduce the beneficiation cost of sericite, and avoid the environmental protection problems of conventional acid positive flotation process. It effectively reduces the content of fine-grained sericite in the tailings dam and improves the stability of the dam.

[0007] In order to achieve the above-mentioned object of the present invention, the technical scheme of the present invention is: a method for reducing the content of sericite in porphyry copper tailings, the method specifically comprising the following steps:

[0008] S1) performing gravity separation and classification operations on the porphyry copper tailings to obtain coarse-grained products and fine-grained products;

[0009] S2) The fine-grained product obtained in the gravity separation S1) is fed into the magnetic separation process;

[0010] S3) performing multiple flotation operations on the strong magnetic tailings obtained by the treatment in S2) to remove sulfide minerals;

[0011] S4) The desulfurized flotation tailings obtained by the treatment in S3) are fed into reverse flotation after adjusting the pulp concentration and pH value, and the obtained reverse flotation tailings are the sericite products.

[0012] Furthermore, the specific process of the gravity classification operation in S1) is as follows:

[0013] The proportion of particles with a diameter 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 diameter of -0.074 mm in the cyclone overflow is 90%-95%;

[0014] Further, the specific process of the magnetic separation operation in S2) is:

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

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

[0017] S3.1) firstly lower the slurry concentration of the strong magnetic tailings obtained in S2), and then adjust the pH value;

[0018] S3.2) The strong magnetic tailings slurry treated in S3.1) is subjected to a flotation desulfurization operation of one roughing selection, two fine selections, and two scavenging selections to remove sulfur-containing impurity minerals in the magnetic tailings slurry.

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

[0020] The amount of the composite sulfide collector added in the primary rough selection in S3.2) is 120g / t-210g / t;

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

[0022] The amount of composite sulfide collector added during scanning is 50g / t-80g / t.

[0023] Furthermore, 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) firstly lowering the concentration of the slurry obtained in S3) and then adjusting the pH value;

[0027] S4.2) adding a certain amount of dispersant, activator and collector to the tailings slurry treated in S4.1) and mixing them evenly;

[0028] S4.3) The tailings slurry treated in S4.2) is subjected to reverse flotation operations of one roughing, two cleaning and two scavenging, and the reverse flotation tailings are the sericite products.

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

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

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

[0032] The activator is Ca 2+ Mg 2+ 、Al 3+ , Ba 2+ , Pb 2+ , Fe 2+ , Fe 3+ One or more of the following;

[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 is prepared by the method.

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

[0036] The present invention provides a method for reducing the content of sericite in a tailings dam. The method adopts a process combining gravity separation and classification, strong magnetic separation and iron removal, flotation desulfurization and sericite reverse flotation to obtain sericite concentrate with good quality from porphyry copper tailings. The Al2O3 content of the sericite concentrate is greater than 25%, the SiO2 content is greater than 48%, and the K2O content is greater than 6%, which exceeds the requirements of first-class sericite formulated in national standards.

[0037] The sericite reverse flotation in the process of the present invention adopts alkaline slurry, which has strong adaptability. Its return water has the same properties as the return water of the copper ore dressing plant. The return water of the entire dressing plant is common, and no wastewater discharge can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0039] The technical scheme of the present invention will be clearly and completely described below in conjunction with specific embodiments, but it will be appreciated by those skilled in the art that the following described embodiments are part of embodiments of the present invention, rather than all embodiments, and are only used to illustrate the present invention, and should not be considered as limiting the scope of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work, all belong to the scope of protection of the present invention. If specific conditions are not indicated in the embodiments, they are carried out according to normal conditions or conditions recommended by the manufacturer. If the manufacturer is not indicated in the reagents or instruments used, they are all conventional products that can be purchased commercially.

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

[0041] like Figure 1 As shown, the present invention provides a method for reducing the content of sericite in porphyry copper tailings, comprising the following steps:

[0042] S1. Gravity separation is used to classify porphyry copper tailings to obtain coarse-grained products and fine-grained products. The coarse-grained products can be used as raw materials for the construction of tailings dams, and the fine-grained products contain more sericite minerals and can be used for subsequent operations;

[0043] The proportion of particles with a diameter 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 diameter of -0.074 mm in the cyclone overflow is 90%-95%;

[0044] S2. Perform strong magnetic separation to remove iron from the fine-grained products obtained by gravity separation to remove minerals with high iron content;

[0045] S3, after reducing the pulp concentration and pH of the strong magnetic separation tailings in S2, a collector, an inhibitor and a frother are mixed, and a flotation desulfurization operation of one roughing, two cleaning and two scavenging is carried out to remove sulfur-containing impurity minerals;

[0046] Among them, the flotation desulfurization test uses a composite reagent with butyl xanthate as the main component and modified mercaptan as the auxiliary component as the sulfide collector, the reagent ratio is 1-2:0.2-0.5, the roughing collector is 120g / t-210g / t, the floating sulfur foaming agent uses a homemade foaming agent, the dosage is 80-100g / t, and the scavenging collector is 50g / t-80g / t.

[0047] S4. After adjusting the pulp concentration and pH of the desulfurized flotation tailings obtained in S3, they are fed into reverse flotation operations of one roughing, two cleaning and two scavenging. The reverse flotation tailings are sericite products. Sodium hydroxide (4000g / t-7000g / t) is used to adjust the pulp pH, dispersant sodium carbonate (300g / t-500g / t) is used to disperse the pulp, 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 reverse flotation collector (400g / t-700g / t) is used to collect quartz and other gangue minerals.

[0048] In the step S1, in the porphyry copper tailings gravity separation operation, it is preferred to use gravity separation equipment such as a spiral chute and a cyclone.

[0049] In 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] The step S4 should include:

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

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

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

[0054] Example 1

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

[0056] S1. Gravity separation is used to classify porphyry copper tailings to obtain coarse-grained products and fine-grained products. The coarse-grained products can be used as raw materials for the construction of tailings dams, and the fine-grained products contain more sericite minerals and can be used for subsequent operations;

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

[0058] S2. The fine-grained product obtained by gravity separation is subjected to high-intensity magnetic separation and iron removal to remove the minerals with high iron content. The magnetic separation medium of the high-intensity magnetic separator is a mesh medium with a magnetic field strength of 5000 Tesla.

[0059] S3, after reducing the pulp concentration of the strong magnetic separation tailings in S2 by 35% and the pH to 6, the collector, inhibitor and frother are mixed, and a flotation desulfurization operation of one roughing, two cleaning and two scavenging is carried out to remove sulfur-containing impurity minerals;

[0060] Among them, the flotation desulfurization test uses a composite reagent with butyl xanthate as the main component and modified mercaptan as the auxiliary component as the sulfide collector, the reagent ratio is 1:0.2, the roughing collector is 210g / t, the floating sulfur foaming agent uses the homemade foaming agent 1#, the dosage is 100g / t, and the scavenging collector is 80g / t.

[0061] S4. After adjusting the pulp concentration of the desulfurized flotation tailings obtained in S3 to 35% and adjusting the pulp pH to 11 with 7000g / t of sodium hydroxide, the tailings are subjected to reverse flotation operations of one roughing, two cleanings and two scavengings. The reverse flotation tailings are sericite products. In the roughing, 500g / t of sodium carbonate dispersant is added to disperse the pulp, 180g / t of sodium hexametaphosphate is used as an inhibitor and dispersant, magnesium chloride and ferrous chloride are prepared in a ratio of 1:1, 400g / t of activated quartz is used, and 700g / t of reverse flotation collector is used to collect quartz and other gangue minerals.

[0062] Wherein, the reverse flotation collector is composed of dodecyl primary amine and sodium fatty acid in a ratio of 1:0.3.

[0063] Example 2

[0064] The present invention provides a method for reducing the content of sericite in porphyry copper tailings, comprising the following steps:

[0065] S1. Gravity separation is used to classify porphyry copper tailings to obtain coarse-grained products and fine-grained products. The coarse-grained products can be used as raw materials for the construction of tailings dams, and the fine-grained products contain more sericite minerals and can be used for subsequent operations;

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

[0067] S2. The fine-grained product obtained by gravity separation is subjected to high-intensity magnetic separation and iron removal to remove the minerals with high iron content. The magnetic separation medium of the high-intensity magnetic separator is a mesh medium with a magnetic field strength of 8000 Tesla.

[0068] S3, after reducing the pulp concentration of the strong magnetic separation tailings in S2 by 28% and the pH to 6.5, the collector, inhibitor and frother are mixed, and a flotation desulfurization operation of one roughing, two cleaning and two scavenging is carried out to remove sulfur-containing impurity minerals;

[0069] Among them, the flotation desulfurization test uses a composite reagent with butyl xanthate as the main component and modified mercaptan as the auxiliary component as the sulfide collector, the reagent ratio is 1:0.5, the roughing collector is 200g / t, the floating sulfur foaming agent uses the homemade foaming agent 1#, the dosage is 80g / t, and the scavenging collector is 85g / t.

[0070] S4. After adjusting the pulp concentration of the desulfurized flotation tailings obtained in S3 to 32% and adjusting the pulp pH to 11.5 with 6500g / t of sodium hydroxide, the tailings are subjected to reverse flotation operations of one roughing, two cleanings and two scavengings. The reverse flotation tailings are sericite products. In the roughing, 450g / t of sodium carbonate dispersant is added to disperse the pulp, 150g / t of sodium hexametaphosphate is used as an inhibitor and dispersant, calcium chloride and lead chloride are prepared in a ratio of 1:2, 350g / t of activated quartz is used, and 560g / t of reverse flotation collector is used to collect quartz and other gangue minerals.

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

[0072] Example 3

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

[0074] S1. Gravity separation is used to classify porphyry copper tailings to obtain coarse-grained products and fine-grained products. The coarse-grained products can be used as raw materials for the construction of tailings dams, and the fine-grained products contain more sericite minerals and can be used for subsequent operations;

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

[0076] S2. The fine-grained product obtained by gravity separation is subjected to high-intensity magnetic separation and iron removal to remove the minerals with high iron content. The magnetic separation medium of the high-intensity magnetic separator is a mesh medium with a magnetic field strength of 7800 Tesla.

[0077] S3, after reducing the pulp concentration of the strong magnetic separation tailings in S2 by 30% and the pH to 7, the collector, inhibitor and frother are mixed, and a flotation desulfurization operation of one roughing, two cleaning and two scavenging is carried out to remove sulfur-containing impurity minerals;

[0078] Among them, the flotation desulfurization test uses a composite reagent with butyl xanthate as the main component and modified mercaptan as the auxiliary component as the sulfide collector, the reagent ratio is 1.3:0.5, the roughing collector is 180g / t, the floating sulfur foaming agent uses the homemade foaming agent 1#, the dosage is 90g / t, and the scavenging collector is 65g / t.

[0079] S4. After the desulfurized flotation tailings obtained in S3 were adjusted to a pulp concentration of 32% and the pulp pH was adjusted to 11 with 5500 g / t of sodium hydroxide, they were subjected to reverse flotation operations of one roughing, two cleanings and two scavengings. The reverse flotation tailings are sericite products. In the roughing, 300 g / t of sodium carbonate dispersant was added to disperse the pulp, 120 g / t of sodium hexametaphosphate was used as an inhibitor and dispersant, aluminum chloride and barium chloride were prepared in a ratio of 2:1, 100 g / t of activated quartz was used, and 400 g / t of reverse flotation collector was used to collect quartz and other gangue minerals.

[0080] Wherein, the reverse flotation collector is composed of dodecyl primary amine and sodium fatty acid in a ratio of 1:0.

[0081] Example 4

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

[0083] S1. Gravity separation is used to classify porphyry copper tailings to obtain coarse-grained products and fine-grained products. The coarse-grained products can be used as raw materials for the construction of tailings dams, and the fine-grained products contain more sericite minerals and can be used for subsequent operations;

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

[0085] S2. The fine-grained product obtained by gravity separation is subjected to high-intensity magnetic separation and iron removal to remove the minerals with high iron content. The magnetic separation medium of the high-intensity magnetic separator is a mesh medium with a magnetic field strength of 6800 Tesla.

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

[0087] Among them, the flotation desulfurization test uses a composite reagent with butyl xanthate as the main component and modified mercaptan as the auxiliary component as the sulfide collector, the reagent ratio is 1.5:0.5, the roughing collector is 160g / t, the floating sulfur foaming agent uses a homemade foaming agent, the dosage is 80g / t, and the scavenging collector is 50g / t.

[0088] S4. After adjusting the pulp concentration of the desulfurized flotation tailings obtained in S3 to 33% and adjusting the pulp pH to 11 with 4000 g / t of sodium hydroxide, the tailings are subjected to reverse flotation operations of one roughing, two cleanings and two scavengings. The reverse flotation tailings are sericite products. In the roughing, 350 g / t of sodium carbonate dispersant is added to disperse the pulp, 90 g / t of sodium hexametaphosphate is used as an inhibitor and dispersant, 150 g / t of ferric chloride is used to activate quartz, and 500 g / t of reverse flotation collector is used to collect quartz and other gangue minerals.

[0089] Wherein, the reverse flotation collector is composed of dodecyl primary amine and sodium fatty acid in a ratio of 1:0.15.

[0090] Comparative Example 1

[0091] The method for reducing the content of sericite in a tailings dam provided in this comparative example is referred to Example 1, except that in step S4, the collector is octadecylamine.

[0092] Comparative Example 2

[0093] The method for reducing the sericite content in porphyry copper tailings provided in this comparative example refers to Example 1, except that in step S4, the collector is sodium oleate.

[0094] Comparative Example 3

[0095] The method for reducing the sericite content in the tailings dam provided in this comparative example refers to Example 1, except that in step S4, the collector is dodecylamine hydrochloride.

[0096] Test Example 1

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

[0098]

[0099]

[0100] The above is a detailed introduction to a method for reducing the content of sericite in porphyry copper tailings provided in the embodiment of the present application. The description of the above embodiment is only used to help understand the method and its core idea of ​​the present application; at the same time, for those skilled in the art, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as limiting the present application.

[0101] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different nouns to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. As mentioned throughout the specification and claims, "including" and "comprising" are open-ended terms, so they should be interpreted as "including / including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve the technical problem within a certain error range and basically achieve the technical effect. The subsequent description of the specification is a preferred embodiment of the present application, but the description is for the purpose of illustrating the general principles of the present application, and is not used to limit the scope of the present application. The scope of protection of the present application shall be subject to that defined in the attached claims.

[0102] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a product or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such a product or system. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the product or system including the elements.

[0103] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "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 within the scope of the application concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not deviate from the spirit and scope of the present application, and should be included in the claims attached to the present application.

Claims

1. A method for reducing the content of sericite in porphyry copper tailings, characterized in that: The method specifically comprises the following steps: S1) performing gravity separation and classification operations on the porphyry copper tailings to obtain coarse-grained products and fine-grained products; S2) The fine-grained product obtained in the gravity separation S1) is fed into the magnetic separation process; S3) performing multiple flotation operations on the strong magnetic tailings obtained by the treatment in S2) to remove sulfide minerals; S4) The desulfurized flotation tailings obtained by the treatment in S3) are fed into reverse flotation after adjusting the pulp concentration and pH value, and the obtained flotation tailings are sericite concentrate.

2. The method according to claim 1, characterized in that The specific process of the gravity classification operation in S1) is as follows: In the porphyry copper tailings, particles with a diameter of -0.074 mm account for 60%-65%, the cyclone pressure is 0.04Mpa-0.08Mpa, and particles with a diameter of -0.074 mm account for 90%-95% in the cyclone overflow.

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

4. The method according to claim 1, characterized in that: The specific process of S3) is: S3.1) firstly lower the slurry concentration of the strong magnetic tailings obtained in S2), and then adjust the pH value; S3.2) The strong magnetic tailings slurry treated in S3.1) is subjected to a flotation desulfurization operation of one roughing selection, two fine selections, and two scavenging selections to remove sulfur-containing impurity minerals in the magnetic tailings slurry.

5. The method according to claim 4, characterized in that The pulp concentration in S3.1) is reduced to 30-35, and the pH value is adjusted to 6-7; The amount of the composite sulfide collector added in the primary rough selection in S3.2) is 120g / t-210g / t; The amount of frother added for flotation desulfurization is 80-100g / t; The amount of composite sulfide collector added during scanning is 50g / t-80g / t.

6. The method according to claim 5, characterized in that The composite sulfide collector comprises butyl xanthate and modified mercaptan, and the mass ratio between the two is 1-2:0.2-0.5; The foaming agent is 2# oil.

7. The method according to claim 1, characterized in that The specific process of S4) is: S4.1) firstly lowering the concentration of the slurry obtained in S3) and then adjusting the pH value; S4.2) adding a certain amount of dispersant, activator and collector to the tailings slurry treated in S4.1) and mixing them evenly; S4.3) The tailings slurry treated in S4.2) is subjected to reverse flotation operations of one roughing, two cleaning and two scavenging, and the reverse flotation tailings are the sericite products.

8. The method according to claim 7, characterized in that In the step S4.1), the slurry concentration is lowered to 30-35%; and the pH value of the slurry is adjusted to 10-12; The amount of dispersant added in S4.2) is 300g / t-500g / t, the amount of activator added is 100g / t-400g / t, and the amount of collector added is 400g / t-700g / t.

9. The method according to claim 8, characterized in that The dispersant is sodium carbonate or sodium hexametaphosphate; The activator is Ca 2+ Mg 2+ 、Al 3+ , Ba 2+ , Pb 2+ , Fe 2+ , Fe 3+ One or more of the following; 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.

10. A sericite concentrate, characterized in that: The sericite concentrate is prepared by the method according to any one of claims 1 to 9.

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