Talc Inhibitor, Preparation Method Thereof, and Method for Recovering Molybdenum from Slime Concentrate of High-Talc Molybdenite

Abstract

The present invention relates to the field of mineral processing technology, and introduces a talc inhibitor and a preparation method thereof, as well as a method for recovering molybdenum from a mud concentrate of high-talc molybdenite. The talc inhibitor includes sodium polyphosphate, cellulose, sodium carboxymethyl starch, sodium carbonate and guar gum; the method for recovering molybdenum from a mud concentrate of high-talc molybdenite comprises the following specific steps: S1, closed-circuit grinding; S2, desludging and flotation; S3, concentration and de-drugation; S4, rough selection of molybdenum; and S5, concentration of molybdenum. The synergistic effect of the reagents of the present invention achieves efficient inhibition of talc to achieve the purpose of separating talc from molybdenite, and has both the high reactivity of inorganic reagents and the environmental friendliness of organic polysaccharides. The present invention solves the problem of talc interference and reduces molybdenum loss by using a pre-de-sludging-mud concentration and de-drugation-segmented flotation process in conjunction with a reagent coordinated control process. The present invention has the advantages of high recovery rate, stable concentrate grade, and high resource utilization.

Description

Technical Field

[0001] The present invention relates to the technical field of mineral processing, in particular to a talc inhibitor and a preparation method thereof, and a method for recovering molybdenum from mud concentrate of high-talc molybdenite. Background Art

[0002] Molybdenum is an important strategic metal widely used in industries such as metallurgy, chemicals, and aerospace. In traditional flotation processes for talc-containing molybdenum ores, molybdenite often coexists closely with talc, serpentine, and other buoyant gangues. This causes the talc to become slime during conventional flotation and mix into the molybdenum concentrate, reducing concentrate quality. Furthermore, fine-grained molybdenite is easily lost in the tailings, impacting recovery rates. While existing talc reverse flotation processes can partially remove talc, they present several challenges: fine-grained molybdenum minerals are easily lost with the slime concentrate, resulting in metal loss rates as high as 25%. In existing technologies, highly floatable talc impurities still exist in the deslimed tailings, affecting the subsequent molybdenite flotation process, resulting in large fluctuations in concentrate grade and high reagent costs. Therefore, there is an urgent need to develop an efficient and environmentally friendly method for desliming and recovering molybdenum metal from slime concentrates. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a talc inhibitor and a method for preparing the same, as well as a method for recovering molybdenum from a mud concentrate of high-talc molybdenite, thereby achieving efficient separation of molybdenite and talc and significantly improving the molybdenum recovery rate of high-talc molybdenite.

[0004] The technical solution adopted in the present invention is:

[0005] A talc inhibitor comprises sodium polyphosphate, sodium carboxymethyl starch, cellulose, sodium carbonate and guar gum, wherein the mass ratio of sodium polyphosphate, sodium carboxymethyl starch, cellulose, sodium carbonate and guar gum is 8:5:2:1:1-6:5:3:1:1.

[0006] A method for preparing a talc inhibitor, comprising the following specific steps:

[0007] a: Dry the sodium carboxymethyl starch at 60°C and pass through a 200-mesh sieve for later use;

[0008] b: Dissolve guar gum powder in 50℃ warm water and stir until completely dispersed;

[0009] c: Premix cellulose and sodium carbonate and ball-mill to a particle size of ≤50 μm;

[0010] d: Add sodium polyphosphate to deionized water at a solid-liquid ratio of 1:5, stir until completely dissolved, and control the temperature at 40-50°C;

[0011] e) Slowly add sodium carboxymethyl starch to the solution prepared in step d, raise the temperature to 70°C, and react at this temperature until a transparent colloid is formed;

[0012] f) Add the guar gum solution from step b and the premixed cellulose and sodium carbonate powder from step c simultaneously to the transparent colloid formed in step e, increase the stirring speed, and stir until a homogeneous suspension is formed;

[0013] g: The mixed solution obtained in step f is fed into a centrifugal spray drying tower with an inlet temperature of 180-200°C and an outlet temperature of 80-100°C to collect powdered inhibitors with a particle size of 80-120 μm.

[0014] A method for recovering molybdenum from a mud concentrate of high-talc molybdenite, comprising the following steps:

[0015] S1. Closed-circuit grinding: A ball mill and a cyclone are used to grind and classify the high-talc molybdenum ore in a closed circuit to obtain a grinding product with a particle size of -0.074 mm accounting for 72%-80%;

[0016] S2, desliming flotation: water is added to the grinding product to form a slurry, a frother is added to the slurry and desliming flotation is carried out in three consecutive flotation machines. The foam from the three flotation machines is collected as the desliming product, and the underflow is the desliming tailings, which enters other conventional molybdenum flotation processes;

[0017] The desliming flotation operation uses an online grade detection system to monitor the talc and molybdenum metal content in the grinding product and the desliming product. By comparing the limit values, the system makes intelligent judgments and dynamically controls the number of flotation machines to be opened in the desliming flotation operation. The specific limit comparisons are as follows:

[0018] When the talc content in the grinding product is ≥15% and the molybdenum grade in the desliming product is ≤0.1%, start three flotation machines and perform three desliming operations;

[0019] When the talc content in the grinding product is 10% or less and less than 15% and the molybdenum grade in the desliming product is ≤0.1%, start a flotation machine and perform one desliming operation;

[0020] When the talc content in the grinding product is less than 10% or the molybdenum grade in the desliming product is greater than 0.1%, desliming flotation operation is not required;

[0021] S3, concentration and drug removal: the desludging product in S2 enters the peripheral transmission thickener for pre-concentration and drug removal to obtain concentrated underflow product and concentrated overflow product; the concentration of the concentrated underflow product is 30%-45%, and the concentration of the concentrated overflow product is ≤2%;

[0022] S4, molybdenum roughing; adding water glass, talc inhibitor and sulfide ore collector to the concentrated underflow product to carry out rough flotation operation to obtain flotation foam and flotation underflow; adding water glass, talc inhibitor and copper inhibitor to the flotation foam to carry out pre-concentration operation, and the underflow of the pre-concentration operation is returned to the previous operation, and the foam of the pre-concentration operation is talc-molybdenum mixed concentrate; adding sulfide ore collector to the flotation underflow to carry out multiple rough scavenging operations, and the foam of the rough scavenging operation is returned to the previous operation, and the underflow of the last rough scavenging operation is the roughing tailings;

[0023] S5, molybdenum concentration; add water glass, talc inhibitor and copper-sulfur inhibitor to the talc-molybdenum mixed concentrate and carry out two separation and concentration operations of refinement I and refinement II in sequence. The bottom flow of refinement I operation and the desludging product in S2 are combined to enter the concentration and de-drug operation in S3, and the bottom flow of refinement II operation returns to refinement I operation. The foam of refinement II operation is obtained to obtain molybdenum concentrate.

[0024] Specifically, the foaming agent in S2 is methyl isobutyl carbinol, and the added amount is 50-80 g / t.

[0025] Specifically, the roughing flotation operation equipment in S4 is an aerated mechanical stirring flotation machine. In the roughing flotation operation, the addition amount of water glass is 300-500 g / t, the addition amount of talc inhibitor is 50-100 g / t, and the addition amount of sulfide ore collector ethyl thiocyanate is 15-30 g / t; in the pre-concentration operation, the addition amount of water glass is 100-200 g / t, the addition amount of talc inhibitor is 20-40 g / t, and the addition amount of copper inhibitor sodium thioglycolate is 15-30 g / t; in the rough scavenging operation, the total addition amount of sulfide ore collector ethyl thiocyanate is 10-20 g / t.

[0026] Specifically, the multiple rough scavenging operations in S4 include scavenging I, scavenging II and scavenging III. The secondary product of each rough scavenging operation, namely the rough scavenging foam, is returned to the previous operation for re-flotation, wherein the foam of scavenging I operation is returned to the previous rough flotation operation; the rough scavenging operation ensures the recovery of useful mineral molybdenum, in order to further improve the recovery rate.

[0027] Specifically, in the S5, 50 g / t of water glass, 5 g / t of talc inhibitor, and 5 g / t of hydrogen peroxide as copper sulfur inhibitor are added in the refinement I operation; 5 g / t of hydrogen peroxide is added in the refinement II operation.

[0028] Due to the adoption of the above technical solution, the present invention has the following advantages:

[0029] 1. The raw materials used in the agent of the present invention are easily available, low in cost, and simple to prepare. The inorganic polymer and polysaccharide organic agent in the agent mainly work synergistically through the triple mechanism of chelation-adsorption-steric coverage to achieve efficient inhibition of talc to achieve the purpose of separating talc from molybdenite. It combines the high reactivity of inorganic agents with the environmental friendliness of organic polysaccharides.

[0030] 2. The present invention optimizes the desludging process according to the talc content of the original ore through dynamic process control, balances product quality and metal loss, and reduces metal resource waste;

[0031] 3. The present invention solves the problem of talc interference and reduces molybdenum loss by adopting the process of pre-deslime separation, mud concentrate concentration and drug removal, staged flotation and coordinated regulation of reagents. Compared with the traditional flotation process of talc-containing molybdenum ore, the present invention has the advantages of high recovery rate, stable concentrate grade and high resource utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a process flow chart of the present invention. DETAILED DESCRIPTION

[0033] The present invention will be further explained below with reference to the accompanying drawings and embodiments, which should not be used to limit the scope of protection of the present invention. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention.

[0034] Taking a high-talc molybdenite ore in a mine in Henan Province, with a molybdenum grade of 0.13% and a talc content of more than 15%, as an example, in the flotation process of the existing technology, due to the influence of the residual sulfide ore collector in the production circulating water, there are high molybdenum metal losses and large amounts of reagents during the desludging flotation operation, resulting in the inability to effectively remove talc. The excellent floatability of talc makes it difficult to separate the subsequent molybdenite and talc, and the grade of the molybdenum concentrate is not high. Example 1

[0035] Combined with attachment Figure 1 As shown, a talc inhibitor of the present invention comprises sodium polyphosphate, sodium carboxymethyl starch, cellulose, sodium carbonate and guar gum, wherein the mass ratio of sodium polyphosphate, sodium carboxymethyl starch, cellulose, sodium carbonate and guar gum is 8:5:2:1:1.

[0036] The preparation method of the above-mentioned talc inhibitor comprises the following specific steps:

[0037] a: Dry sodium carboxymethyl starch at 60°C for 2 hours and pass through a 200-mesh sieve for later use;

[0038] b: Dissolve guar gum powder in 50℃ warm water and stir until completely dispersed;

[0039] c: Premix cellulose and sodium carbonate and ball-mill to a particle size of ≤50 μm;

[0040] d: Add sodium polyphosphate to deionized water at a solid-liquid ratio of 1:5, stir until completely dissolved, and control the temperature at 40-50°C;

[0041] e) Slowly add sodium carboxymethyl starch to the solution prepared in step d, raise the temperature to 70°C, and react at this temperature until a transparent colloid is formed;

[0042] f) Add the guar gum solution from step b and the premixed cellulose and sodium carbonate powder from step c simultaneously to the transparent colloid formed in step e, increase the stirring speed, and stir until a homogeneous suspension is formed;

[0043] g: The mixed solution obtained in step f is fed into a centrifugal spray drying tower with an inlet temperature of 200°C and an outlet temperature of 100°C to collect powdered inhibitors with a particle size of 80-120 μm.

[0044] The method for recovering molybdenum from high-talc molybdenite mud concentrate using the talc inhibitor is as follows:

[0045] S1. Closed-circuit grinding: A ball mill and a cyclone are used to grind and classify the high-talc molybdenum ore in a closed circuit to obtain a grinding product with a particle size of -0.074 mm accounting for 72%-80%;

[0046] S2, desliming flotation: water is added to the grinding product to form a slurry, and methyl isobutyl carbinol (MIBC) is added to the slurry as a foaming agent at a rate of 50-80 g / t. Desliming flotation is performed in three consecutive flotation machines. The foam products of the three flotation machines are combined into a desliming product with a talc content of >50%. The underflow is the deslimed tailings, which enters other conventional molybdenum flotation processes.

[0047] The desliming flotation operation uses an online grade detection system to monitor the talc and molybdenum metal content in the grinding product and the desliming product. By comparing the limit values, the system makes intelligent judgments and dynamically controls the number of flotation machines to be opened in the desliming flotation operation. The specific limit comparisons are as follows:

[0048] The talc content in the grinding product is ≥15%, and the molybdenum grade in the desliming product is ≤0.1%. Three flotation machines are turned on and desliming is carried out three times.

[0049] S3, concentration and drug removal: the desludging product in S2 enters the peripheral transmission thickener for pre-concentration and drug removal to obtain concentrated underflow product and concentrated overflow product; the concentration of the concentrated underflow product is 30%, and the concentration of the concentrated overflow product is 1%;

[0050] Peripheral feeding is used to extend the thickening time of the deslimed product in the thickener as much as possible, ensuring the removal effect of the frother during the desliming flotation process and alleviating the problems of poor pulp fluidity and weak enrichment effect caused by the viscosity of talc in the subsequent roughing and cleaning operations.

[0051] S4, molybdenum roughing: add 300g / t of water glass, 50g / t of talc inhibitor, and 15g / t of sulfide ore collector ethyl dithiocarbamide to the concentrated underflow product to perform roughing flotation operation to obtain flotation foam and flotation underflow;

[0052] 100g / t of water glass, 20g / t of talc inhibitor, and 15g / t of copper inhibitor sodium acetate are added to the flotation foam for pre-concentration. The underflow of the pre-concentration operation is returned to the previous operation. The foam of the pre-concentration operation is a talc-molybdenum mixed concentrate.

[0053] Sulfide ore collector is added to the flotation underflow to carry out three rough sweeping operations, namely sweep I, sweep II and sweep III. The foam of each rough sweeping operation is returned to the previous operation, among which the foam of sweep I operation is returned to the previous rough flotation operation. The underflow of the last rough sweeping operation obtains roughing tailings. The total addition amount of sulfide ore collector ethylsulfuron in the three rough sweeping operations is 10-20g / t. The rough sweeping operation ensures the recovery of useful mineral molybdenum to further improve the recovery rate.

[0054] S5, molybdenum concentration; add 50g / t of water glass, 5g / t of talc inhibitor, and 5g / t of copper-sulfur inhibitor hydrogen peroxide to the talc-molybdenum mixed concentrate, and then carry out two separation and concentration operations, namely, purification I and purification II. In the purification II operation, 5g / t of hydrogen peroxide is added; the underflow of purification I operation and the desludging product in S2 are combined to enter the concentration and de-drug operation in S3, and the underflow of purification II operation is returned to purification I operation. The foam of purification II operation is obtained to obtain molybdenum concentrate. Example 2

[0055] Combined with attachment Figure 1 As shown, a talc inhibitor of the present invention comprises sodium polyphosphate, sodium carboxymethyl starch, cellulose, sodium carbonate and guar gum, wherein the mass ratio of sodium polyphosphate, sodium carboxymethyl starch, cellulose, sodium carbonate and guar gum is 6:5:3:1:1.

[0056] The preparation method of the above-mentioned talc inhibitor comprises the following specific steps:

[0057] a: Dry sodium carboxymethyl starch at 60°C for 2 hours and pass through a 200-mesh sieve for later use;

[0058] b: Dissolve guar gum powder in 50℃ warm water and stir until completely dispersed;

[0059] c: Premix cellulose and sodium carbonate and ball-mill to a particle size of ≤50 μm;

[0060] d: Add sodium polyphosphate to deionized water at a solid-liquid ratio of 1:5, stir until completely dissolved, and control the temperature at 40-50°C;

[0061] e) Slowly add sodium carboxymethyl starch to the solution prepared in step d, raise the temperature to 70°C, and react at this temperature until a transparent colloid is formed;

[0062] f) Add the guar gum solution from step b and the premixed cellulose and sodium carbonate powder from step c simultaneously to the transparent colloid formed in step e, increase the stirring speed, and stir until a homogeneous suspension is formed;

[0063] g: The mixed solution obtained in step f is fed into a centrifugal spray drying tower with an inlet temperature of 180°C and an outlet temperature of 80°C to collect powdered inhibitors with a particle size of 80-120 μm.

[0064] The method for recovering molybdenum from high-talc molybdenite mud concentrate using the talc inhibitor is as follows:

[0065] S1. Closed-circuit grinding: A ball mill and a cyclone are used to grind and classify the high-talc molybdenum ore in a closed circuit to obtain a grinding product with a particle size of -0.074 mm accounting for 72%-80%;

[0066] S2, desliming flotation: water is added to the grinding product to form a slurry, and methyl isobutyl carbinol (MIBC) is added to the slurry as a foaming agent at a rate of 50-80 g / t. Desliming flotation is performed in three consecutive flotation machines. The foam products of the three flotation machines are combined into a desliming product with a talc content of >50%. The underflow is the deslimed tailings, which enters other conventional molybdenum flotation processes;

[0067] The desliming flotation operation uses an online grade detection system to monitor the talc and molybdenum metal content in the grinding product and the desliming product. By comparing the limit values, the system makes intelligent judgments and dynamically controls the number of flotation machines to be opened in the desliming flotation operation. The specific limit comparisons are as follows:

[0068] The talc content in the grinding product is ≥15%, and the molybdenum grade in the desliming product is ≤0.1%. Three flotation machines are turned on and desliming is carried out three times.

[0069] S3, concentration and drug removal: the desludging product in S2 enters the peripheral transmission thickener for pre-concentration and drug removal, obtaining a concentrated underflow product and a concentrated overflow product; the concentration of the concentrated underflow product is 45%, and the concentration of the concentrated overflow product is 1%;

[0070] Peripheral feeding is used to extend the thickening time of the deslimed product in the thickener as much as possible, ensuring the removal effect of the frother during the desliming flotation process and alleviating the problems of poor pulp fluidity and weak enrichment effect caused by the viscosity of talc in the subsequent roughing and cleaning operations.

[0071] S4, molybdenum roughing; adding 500g / t of water glass, 100g / t of talc inhibitor, and 30g / t of sulfide ore collector ethyl dithiocarbamide to the concentrated underflow product, performing roughing flotation operation to obtain flotation froth and flotation underflow;

[0072] Add 200g / t of water glass, 40g / t of talc inhibitor, and 30g / t of copper inhibitor sodium acetate to the flotation foam for pre-concentration. The underflow of the pre-concentration operation is returned to the previous operation. The foam of the pre-concentration operation is a talc-molybdenum mixed concentrate.

[0073] Sulfide ore collector is added to the flotation underflow to carry out three rough sweeping operations, namely sweep I, sweep II and sweep III. The foam of each rough sweeping operation is returned to the previous operation, among which the foam of sweep I operation is returned to the previous rough flotation operation. The underflow of the last rough sweeping operation obtains roughing tailings. The total addition amount of sulfide ore collector ethylsulfuron in the three rough sweeping operations is 10-20g / t. The rough sweeping operation ensures the recovery of useful mineral molybdenum to further improve the recovery rate.

[0074] S5, molybdenum concentration; add 50g / t of water glass, 5g / t of talc inhibitor, and 5g / t of copper-sulfur inhibitor hydrogen peroxide to the talc-molybdenum mixed concentrate, and then carry out two separation and concentration operations, namely, purification I and purification II. In the purification II operation, 5g / t of hydrogen peroxide is added; the underflow of purification I operation and the desludging product in S2 are combined to enter the concentration and de-drug operation in S3, and the underflow of purification II operation is returned to purification I operation. The foam of purification II operation is obtained to obtain molybdenum concentrate.

[0075] Table 1 is a comparative table of molybdenum concentrate recovery in two embodiments of the present invention.

[0076] Example Product Name Mo grade Mo operation recovery rate Example 1 Molybdenum concentrate 18.95% 66.50% Example 2 Molybdenum concentrate 15.31% 70.75%

[0077] It can be seen from the results in Table 1 that, under the same flotation process, the talc inhibitor ratio and the dosage of the reagent are adjusted, and Example 1 obtains a molybdenum concentrate grade of 18.95% and a molybdenum concentrate operation recovery rate of 66.50%. The recovery rate and grade obtained in Example 2 are 15.31% and 70.75%, respectively. The above results show that the use of talc inhibitor can selectively inhibit talc when the talc content of the desludging product is greater than 50%, effectively separate talc and molybdenite, and effectively improve the comprehensive recovery rate of molybdenum.

[0078] The parts not described in detail in this invention are prior art.

[0079] The embodiments selected herein for the purpose of disclosing the invention are presently considered suitable, but it should be understood that the invention is intended to include all variations and modifications of the embodiments that fall within the scope of the concept and invention.

Claims

1. A talc inhibitor, characterized in that: The invention comprises sodium polyphosphate, sodium carboxymethyl starch, cellulose, sodium carbonate and guar gum, wherein the mass ratio of sodium polyphosphate, sodium carboxymethyl starch, cellulose, sodium carbonate and guar gum is 8:5:2:1:1-6:5:3:1:

1.

2. A method for preparing a talc inhibitor according to claim 1, characterized in that: The specific steps are: a: Dry the sodium carboxymethyl starch at 60°C and pass through a 200-mesh sieve for later use; b: Dissolve guar gum powder in 50℃ warm water and stir until completely dispersed; c: Premix cellulose and sodium carbonate and ball-mill to a particle size of ≤50 μm; d: Add sodium polyphosphate to deionized water at a solid-liquid ratio of 1:5, stir until completely dissolved, and control the temperature at 40-50°C; e) Slowly add sodium carboxymethyl starch to the solution prepared in step d, raise the temperature to 70°C, and react at this temperature until a transparent colloid is formed; f) Add the guar gum solution from step b and the premixed cellulose and sodium carbonate powder from step c simultaneously to the transparent colloid formed in step e, increase the stirring speed, and stir until a homogeneous suspension is formed; g: The mixed solution obtained in step f is fed into a centrifugal spray drying tower with an inlet temperature of 180-200°C and an outlet temperature of 80-100°C to collect powdered inhibitors with a particle size of 80-120 μm.

3. A method for recovering molybdenum from mud concentrate of high-talc molybdenite using the talc inhibitor prepared by the preparation method according to claim 2, characterized in that: The specific steps are: S1. Closed-circuit grinding: A ball mill and a cyclone are used to grind and classify the high-talc molybdenum ore in a closed circuit to obtain a grinding product with a particle size of -0.074 mm accounting for 72%-80%; S2, desliming flotation: water is added to the grinding product to form a slurry, and a frother is added to the slurry to perform desliming flotation in three consecutive flotation machines. The foam products of the three flotation machines are combined into the desliming product, and the underflow is the desliming tailings, which enters other conventional molybdenum flotation processes; The desliming flotation operation uses an online grade detection system to monitor the talc and molybdenum metal content in the grinding product and the desliming product. By comparing the limit values, the system makes intelligent judgments and dynamically controls the number of flotation machines to be opened in the desliming flotation operation. The specific limit comparisons are as follows: When the talc content in the grinding product is ≥15% and the molybdenum grade in the desliming product is ≤0.1%, start three flotation machines and perform three desliming operations; When the talc content in the grinding product is 10% or less and less than 15% and the molybdenum grade in the desliming product is ≤0.1%, start a flotation machine and perform one desliming operation; When the talc content in the grinding product is less than 10% or the molybdenum grade in the desliming product is greater than 0.1%, desliming flotation operation is not required; S3, concentration and drug removal: the desludging product in S2 enters the peripheral transmission thickener for pre-concentration and drug removal to obtain concentrated underflow product and concentrated overflow product; the concentration of the concentrated underflow product is 30%-45%, and the concentration of the concentrated overflow product is ≤2%; S4, molybdenum roughing; adding water glass, talc inhibitor and sulfide ore collector to the concentrated underflow product to carry out rough flotation operation to obtain flotation foam and flotation underflow; adding water glass, talc inhibitor and copper inhibitor to the flotation foam to carry out pre-concentration operation, and the underflow of the pre-concentration operation is returned to the previous operation. The foam of the pre-concentration operation is talc-molybdenum mixed concentrate; adding sulfide ore collector to the flotation underflow to carry out multiple rough scavenging operations, and the foam of each rough scavenging operation is returned to the previous operation. The underflow of the last rough scavenging operation is the roughing tailings; S5, molybdenum concentration; add water glass, talc inhibitor and copper-sulfur inhibitor to the talc-molybdenum mixed concentrate and carry out two separation and concentration operations of refinement I and refinement II in sequence. The bottom flow of refinement I operation and the desludging product in S2 are combined to enter the concentration and de-drug operation in S3, and the bottom flow of refinement II operation returns to refinement I operation. The foam of refinement II operation is obtained to obtain molybdenum concentrate.

4. The method for recovering molybdenum from a mud concentrate of high-talc molybdenite according to claim 3, wherein: The foaming agent in S2 is methyl isobutyl carbinol, and the added amount is 50-80g / t.

5. The method for recovering molybdenum from a mud concentrate of high-talc molybdenite according to claim 3, wherein: The roughing flotation equipment in S4 is an aerated mechanical stirring flotation machine. In the roughing flotation operation, the amount of water glass added is 300-500 g / t, the amount of talc inhibitor added is 50-100 g / t, and the amount of sulfide ore collector ethyl thiocyanate added is 15-30 g / t; in the pre-concentration operation, the amount of water glass added is 100-200 g / t, the amount of talc inhibitor added is 20-40 g / t, and the amount of copper inhibitor sodium thioglycolate added is 15-30 g / t; in the rough scavenging operation, the total amount of sulfide ore collector ethyl thiocyanate added is 10-20 g / t.

6. The method for recovering molybdenum from a mud concentrate of high-talc molybdenite according to claim 3, wherein: The multiple rough sweeping operations in S4 include sweep I, sweep II and sweep III. The secondary product of each rough sweeping operation, namely the rough sweeping foam, is returned to the previous operation for re-flotation, wherein the foam of sweep I operation is returned to the previous roughing flotation operation.

7. The method for recovering molybdenum from a mud concentrate of high-talc molybdenite according to claim 3, wherein: In the S5, 50 g / t of water glass, 5 g / t of talc inhibitor, and 5 g / t of copper-sulfur inhibitor are added in the refinement I process; 5 g / t of hydrogen peroxide is added in the refinement II process.

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