A molybdenite depressant and a beneficiation method of high talc type molybdenum ore

Abstract

The application provides a molybdenite inhibitor and a beneficiation method of high-talc molybdenite, the molybdenite inhibitor has high efficiency selectivity of molybdenum inhibition, and active components of the molybdenite inhibitor include A component and B component, and the mass ratio of the two is 1:1.5-8:1, wherein the active components of the A component include sodium hypochlorite and ferric chloride, and the mass ratio of the two is 1:6-2:1; the active components of the B component include thiamine pyrophosphate and pullulan, and the mass ratio of the two is 1:8-2.5:1. In the beneficiation method of the high-talc molybdenite, the molybdenite inhibitor can selectively oxidize and inhibit the molybdenite according to the synergistic effect between the reagents and the difference between the surface properties of the molybdenite and the talc, so that the molybdenite and the talc can be efficiently separated. The application improves the molybdenum recovery rate of the beneficiation product, effectively reduces the reagent dosage of the traditional gangue inhibitor sodium silicate, has positive benefits on subsequent wastewater treatment, ore slurry concentration and sedimentation, and effectively reduces the environmental pollution caused by the wastewater.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of mineral flotation, and particularly relates to a molybdenite depressant and a beneficiation method of high talc-type molybdenum ore. BACKGROUND

[0002] Metallic molybdenum and its alloys have high melting point, corrosion resistance, good ductility and other characteristics, and are valued by many countries in the world. Molybdenum has been an important metal raw material for national scientific and technological development, and is also an important strategic reserve resource in China. Molybdenum is less distributed in nature, and the average content in the earth's crust is about 0.001%. China has nearly 830 million tons of molybdenum reserves, accounting for about 52% of the world's total reserves, and is the country with the most abundant molybdenum resources in the world. According to statistics, 99% of molybdenum resources in China come from molybdenite, such as the high talc-type molybdenum ore in Shangfanggou, Henan. Since molybdenum and talc are closely associated, and their floatability is very close, nearly 705,000 tons of molybdenum metal has not been effectively developed and utilized. Therefore, how to improve the development and utilization level of this type of talc-type molybdenum ore is of great significance to promote the development of China's molybdenum industry.

[0003] With the continuous exploitation and utilization of rich ores and easy-to-select minerals, complex, lean and difficult-to-process molybdenum resources cannot be recovered by gravity separation and other physical methods, and flotation is the most important method for selecting talc-type molybdenum ore with fine-grained dissemination. The existing flotation separation reagents for talc and molybdenite are mainly polysaccharide gangue depressants. However, this type of gangue depressant often has poor selectivity, complex process and other problems. At the same time, a large amount of water glass is added in the process of inhibiting talc, which leads to difficult settling of the slurry, difficult concentration, poor utilization effect of return water, and increased difficulty in tailings treatment. Therefore, the development of high-efficiency and high-selectivity talc-type molybdenite reagent and flotation method is of great significance to improve the comprehensive utilization rate of molybdenum resources.

[0004] Chinese invention patent application CN115025888A provides a molybdenite inhibiting protective agent and a molybdenum ore dressing method containing easily floating layered silicate gangue minerals. The components of the molybdenite inhibiting protective agent are adsorbed on the surface of molybdenite through chemical and physical action, forming a "protective wall" of molybdenite minerals, preventing the easily floating layered silicate gangue inhibitor from adsorbing on the surface of molybdenite, making the floatability of molybdenite and layered silicate minerals different, eliminating the interference of easily floating layered silicate gangue minerals on molybdenite flotation, and improving the recovery rate of molybdenum. Chinese invention patent CN110465412B discloses a molybdenite dressing gangue inhibitor and a preparation method thereof. The molybdenite dressing gangue inhibitor includes sodium silicate, gum ghatti, aluminum sulfate, aluminum potassium sulfate dodecahydrate, sodium carboxymethyl cellulose, tannin extract, and dextrin. Through the organic combination of the components, a water film can be formed on the gangue in the molybdenite, avoiding hydrophobic foaming, reducing the viscosity of the slurry and foam, reducing or blocking the adsorption between the gangue and the collector, and improving the collection efficiency of the collector. The above two patents mainly inhibit the easily floating gangue (such as talc and mica) to change its hydrophilicity, so that the floatability of molybdenite and talc is different, thereby improving the recovery rate of molybdenite. SUMMARY

[0005] In view of the fact that talc and molybdenite have very similar and excellent natural floatability, and the existing gangue inhibitors have poor selectivity and are difficult to selectively float and separate, the purpose of the present application is to provide a molybdenite inhibitor and a dressing method for high-talc molybdenum ore, which uses a specific reagent combination to efficiently and selectively inhibit molybdenite, thereby realizing the flotation separation of talc and molybdenite.

[0006] The first object of the present application is to provide a molybdenite inhibitor, which comprises A component and B component: the A component comprises sodium hypochlorite and ferric chloride; the B component comprises thiamine pyrophosphate and pullulan;

[0007] The mass ratio of the A component and the B component is 1:1.5~8:1; the mass ratio of sodium hypochlorite and ferric chloride in the A component is 1:6~2:1; the mass ratio of thiamine pyrophosphate and pullulan in the B component is 1:8~2.5:1.

[0008] Sodium hypochlorite (NaClO), the active component of inorganic reagent combination A, is a strong inorganic oxidant. In the pulp, molybdenite, after crushing and grinding, exposes its non-polar basal facets and polar facets. Sodium hypochlorite acts on the polar facets of molybdenite, oxidizing them to form more hydrophilic molybdenum oxide and molybdenum hydroxyl groups, thus enhancing the hydrophilicity of molybdenite in the pulp. However, the polar facets of talc exposed after crushing and grinding are not oxidized by sodium hypochlorite, thereby widening the hydrophilic / hydrophobic difference between molybdenite and talc. Ferric chloride (FeCl3), the active component of inorganic reagent combination A, also has an oxidizing effect in the pulp and can co-oxidize the exposed facets of molybdenite with sodium hypochlorite, enhancing the oxidation process during flotation. 3+ It adsorbs onto the oxidized facets of molybdenite to form hydroxyl complexes, further promoting the hydrophilicity of the molybdenite surface, while Fe... 3+ After adsorption on the oxide facets of molybdenite, it readily binds to the polyhydroxyl structure of pullulan polysaccharide, the active component of organic reagent combination B, synergistically promoting the surface hydrophilicity of molybdenite. The active component of combination B, thiamine pyrophosphate, exists in the form of a multi-ring sulfur-nitrogen ring, exhibiting strong electronegativity in the pulp. It does not act on talc, which also has strong electronegativity, but selectively acts on molybdenite, which has relatively low electronegativity. Furthermore, the ring structure has less steric hindrance to the molybdenite surface, facilitating adsorption. The phosphate fraction of thiamine pyrophosphate has strong hydrophilicity, further amplifying the difference in hydrophilicity and hydrophobicity between molybdenite and talc during flotation.

[0009] Furthermore, the mass ratio of component A to component B is 2:1 to 4:1, the mass ratio of sodium hypochlorite to ferric chloride in component A is 1:4 to 2:1.5, and the mass ratio of thiamine pyrophosphate to pullulan in component B is 1:6 to 2:1.

[0010] Furthermore, the mass ratio of component A to component B is 2.5:1; the mass ratio of sodium hypochlorite to ferric chloride in component A is 1:2; and the mass ratio of thiamine pyrophosphate to pullulan in component B is 1:5.

[0011] Preferably, component A is prepared using a sodium hypochlorite (NaClO) aqueous solution with a mass concentration of 2-5% and a ferric chloride (FeCl3) aqueous solution with a mass concentration of 1-2%.

[0012] Preferably, component B is prepared using an aqueous solution of thiamine pyrophosphate with a mass concentration of 0.5-1% and an aqueous solution of pullulan with a mass concentration of 1-5%.

[0013] Based on the same inventive concept, a second objective of this invention is to provide a beneficiation method for high-talc molybdenum ore, comprising the following steps:

[0014] S1, grinding: grinding the high talc type molybdenum ore, to obtain a grinding product with-0.074mm accounting for 75~85%;

[0015] S2, desliming flotation: adding water to the grinding product to form a slurry, and adding a frother to the slurry to perform a desliming flotation operation, to obtain a desliming product and a desliming tailings;

[0016] S3, molybdenum roughing: adding a gangue depressant, a collector and a frother to the desliming tailings to perform a roughing flotation operation, to obtain a flotation froth and a flotation underflow; the flotation froth is added with a gangue depressant to start a plurality of pre-concentration operations, the underflow of each pre-concentration operation is returned to the previous operation, and the froth of the last pre-concentration operation is a talc-molybdenum mixed concentrate; the flotation underflow is added with a collector and a frother to start a plurality of roughing operations, the froth of each roughing operation is returned to the previous operation, and the underflow of the last roughing operation is a roughing tailings;

[0017] S4, molybdenum cleaning: regrinding the talc-molybdenum mixed concentrate, the regrinding product has a fineness of-0.038mm accounting for 85~95%; adding the above-mentioned molybdenite depressant and a frother to the regrinding product to perform a separation roughing operation, to obtain a roughing froth and a roughing underflow; the roughing froth is added with the molybdenite depressant to perform a plurality of separation cleaning operations, the underflow of each separation cleaning operation is returned to the previous operation, and the froth of the last separation cleaning operation is a cleaning tailings; the roughing underflow is added with a collector and a frother to perform a plurality of separation scavenging operations, the froth of each separation scavenging operation is returned to the previous operation, and the underflow of the last separation scavenging operation is a molybdenum concentrate.

[0018] Further, in step S1, the molybdenum grade of the ore is 0.05~0.2%.

[0019] Preferably, the ore is ground by a ball mill to ensure the operation fineness, so that the particle size of the grinding product is-0.074mm accounting for 75~85%.

[0020] Further, in step S2, the desliming flotation includes 2 times of desliming flotation, each with 1~2min of stirring and 2~4min of flotation, and the addition amount of the frother is 10~100g / t.

[0021] Further, in step S3, the molybdenum roughing operation includes a roughing flotation operation, three pre-concentration operations (pre-concentration 1, 2, 3), three roughing scavenging operations (roughing scavenging 1, 2, 3); in the roughing flotation operation, the addition amount of gangue inhibitor is 600-3000 g / t, stirring for 1.5-4 min; the addition amount of collector is 100-200 g / t, stirring for 2-3 min; the addition amount of frother is 10-50 g / t, stirring for 1-2 min, and flotation for 3-5 min; in the pre-concentration 1 operation, the addition amount of gangue inhibitor is 400-1500 g / t, in the pre-concentration 2 and 3 operations, the addition amount of gangue inhibitor is 150-700 g / t, and in the three pre-concentration operations, stirring is performed for 1-2 min and flotation is performed for 1.5-3 min; in the three roughing scavenging operations, stirring is performed for 2-3 min and flotation is performed for 2-4 min, and in a single operation, the addition amount of collector is 30-120 g / t and the addition amount of frother is 5-20 g / t.

[0022] In step S3, multi-stage (three times) pre-concentration operations are adopted to remove as much gangue (including calcite, quartz, etc.) as possible, and the pre-concentration 1 operation is used as the front stage, and the amount of gangue inhibitor used in the pre-concentration 1 operation is greater than the amount of gangue inhibitor used in the pre-concentration 2 and 3 operations. For the flotation underflow obtained from the roughing flotation operation, multi-stage (three times) roughing scavenging operations are also adopted to ensure the recovery of useful molybdenum minerals. To further improve the recovery rate, the secondary products (pre-concentration underflow and roughing scavenging froth) of each pre-concentration or roughing scavenging operation are returned to the previous operation for flotation again. Among them, the underflow of the pre-concentration 1 operation and the froth of the roughing scavenging 1 operation are returned to the previous roughing flotation operation.

[0023] Further, in step S4, the molybdenum concentration operation includes a separation roughing operation, three separation concentration operations (separation concentration 1, 2, 3), and three separation scavenging operations (separation scavenging 1, 2, 3); in the separation roughing operation, the molybdenite inhibitor is added in an amount of 300-800 g / t, stirring is performed for 2-3 min, and the frother is added in an amount of 20-40 g / t, stirring is performed for 1-3 min; in the separation concentration operation, the addition amount of molybdenite inhibitor in the separation concentration 1 operation is 20-100 g / t, the addition amount of molybdenite inhibitor in the separation concentration 2 and 3 operations is 20-60 g / t, and in the three separation concentration operations, stirring is performed for 1-3 min and flotation is performed for 2-5 min; in the separation scavenging operation, 5-15 g / t of collector is added in the separation scavenging 1 operation, and 5-15 g / t of frother is added in the separation scavenging 2 and 3 operations; in the three separation scavenging operations, stirring is performed for 1-3 min and flotation is performed for 1-2 min.

[0024] In step S4, the number of times of the separation and cleaning operation and the dosage of the reagent are changed in a similar manner to step S3, except that in the separation and cleaning operation, the dosage of the collector in the separation and cleaning 1 operation is controlled to be sufficient to support the use of the separation and cleaning operation throughout, and if the dosage is excessive, it will lead to the floating of molybdenum in the subsequent separation and cleaning 2 and 3 operations; in the separation and cleaning 2 and 3 operations, the amount of foam in the separation and cleaning operation is increased by adding a foaming agent.

[0025] Further, in step S4, the concentration of the molybdenite depressant is ≥1×10 -4 mol / L.

[0026] Preferably, the concentration of the molybdenite depressant is ≥3×10 -4 mol / L.

[0027] Further, in steps S2 to S4, the concentration of the foaming agent is 1×10 -6 mol / L to 1×10 -4 mol / L. The dosage of the foaming agent can be adjusted according to the foaming condition, that is, the dosage of the foaming agent is reduced when the amount of foam is large, and the dosage of the foaming agent is increased when the amount of foam is small.

[0028] Further, the gangue depressant is water glass and sodium hexametaphosphate, and the weight ratio of the two is 0.5 to 20:1.

[0029] Preferably, in the roughing flotation operation in step S3, the dosage of water glass is 500 to 2000 g / t, and the dosage of sodium hexametaphosphate is 100 to 1000 g / t; in the pre-concentration 1 operation, the dosage of water glass is 300 to 1000 g / t, and the dosage of sodium hexametaphosphate is 100 to 500 g / t; in the pre-concentration 2 and pre-concentration 3 operations, the dosage of water glass is 100 to 500 g / t, and the dosage of sodium hexametaphosphate is 50 to 200 g / t.

[0030] Further, the collector is diesel oil.

[0031] Further, the foaming agent is one or more of pine oil, methyl phenol acid, heavy pyridine, methyl isobutyl carbinol, eucalyptus oil, camphor oil, higher alcohols, and synthetic foaming agents.

[0032] The beneficial effects of the present application are:

[0033] 1. The raw materials used in this invention are readily available and low in cost. The reagent mainly involves hypochlorite ions first contacting molybdenite in the mineral to undergo a redox reaction, which increases the hydrophilicity of the molybdenite surface. The hydroxyl groups in the polysaccharide organic reagent can strongly adsorb onto the oxidized hydrophilic molybdenite surface, thereby enhancing its surface hydrophilicity and achieving the separation of talc and molybdenite by inhibiting molybdenite. The active component thiamine pyrophosphate effectively enhances the selectivity of the reagent.

[0034] 2. This invention effectively reduces the amount of water glass used in traditional silicate gangue minerals, which has positive benefits for subsequent wastewater treatment and slurry concentration and sedimentation, and effectively reduces the pollution of wastewater to the environment.

[0035] 3. The reagent used in this invention can significantly inhibit molybdenite. It has good compatibility with some talc-type molybdenum ore products with high talc content, greatly improving the selective separation of talc and molybdenite. The molybdenum loss rate of the beneficiated products is low, only about 2-8%.

[0036] Instruction manual illustrations

[0037] Figure 1 This is a schematic diagram of the process flow for Example 1;

[0038] Figure 2 This is a schematic diagram of the process flow for Example 2. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other. Unless otherwise specified, the technical means used in the embodiments are conventional means well known to those skilled in the art.

[0040] Example 1

[0041] The effects of this invention are illustrated using single minerals of talc and molybdenite, and a mixture of the two (mass ratio 1:1). The fineness of molybdenite and talc is guaranteed to be -0.074 mm, accounting for 95%. The purity of pure molybdenite is greater than 95%, with a grade of approximately 57.57%. After artificial mixing with talc, the Mo grade in the mixed ore is approximately 28.78%.

[0042] The mineral processing flow and reagent system in this embodiment are as follows: Figure 1As shown, the flotation process adopts a manual mixed ore one-time separation process, in the process, the mixed ore is inhibited using the molybdenite depressant of the application, and then only a frother is added for the flotation separation process, the frother type is selected as methyl isobutyl carbinol (MIBC), and the frother concentration is 1×10 -4 mol / L.

[0043] (1) Preparation of molybdenite depressant: the molybdenite depressant is mixed by inorganic reagent combination A and organic reagent combination B at a mass ratio of 3:1, wherein the inorganic reagent combination A is mixed by a sodium hypochlorite (NaClO) aqueous solution with a mass concentration of 5% and a ferric chloride (FeCl3) aqueous solution with a mass concentration of 1% at a mass ratio of 1:2, and the organic reagent combination B is mixed by a thiamine pyrophosphate aqueous solution with a mass concentration of 0.5% and a pullulan aqueous solution with a mass concentration of 2% at a mass ratio of 3:4.

[0044] (2) One-time separation: the above mixed ore (-0.074 mm accounts for 95%) is added with water to prepare a slurry, the molybdenite depressant prepared in step S1 (concentration of 1×10 -5 mol / L) is added into the slurry, the adding amount is 300 g / t, 10 g / t of MIBC is added, stirring for 2 min, and flotation for 3.5 min.

[0045] The flotation test results are shown in Table 1 as 1#.

[0046] Comparative Example 1

[0047] Different from Example 1, in the one-time separation, dextrin is used as the gangue depressant instead of the molybdenite depressant, and the remaining steps and raw materials are the same as those of Example 1. The flotation test results are shown in Table 1 as 2#.

[0048] Comparative Example 2

[0049] Different from Example 1, in the one-time separation, sodium lignosulfonate is used as the gangue depressant instead of the molybdenite depressant, and the remaining steps and raw materials are the same as those of Example 1. The flotation test results are shown in Table 1 as 3#.

[0050] Comparative Example 3

[0051] Different from Example 1, in the one-time separation, starch is used as the gangue depressant instead of the molybdenite depressant, and the remaining steps and raw materials are the same as those of Example 1. The flotation test results are shown in Table 1 as 4#.

[0052] Table 1: Test results of artificial mixed ore in flotation tests 1#~4% / %

[0053]

[0054] Based on the previous experiments of the inventors, when the molybdenite depressant of the present application is used as a combined gangue depressant, the separation index of talc and molybdenum is optimal at an addition amount of 300 g / t. In Example 1 and Comparative Examples 1-3, 300 g / t is selected as the addition amount of the gangue depressant. As shown in Table 1, the separation index of talc and molybdenum in Example 1 is optimal, in which molybdenum is enriched in the reverse flotation underflow, the molybdenum grade in the molybdenum concentrate is 47.97%, the molybdenum recovery is 82.27%, talc is mainly in the reverse flotation froth, the molybdenum grade in the talc concentrate is 1.31%, and the molybdenum loss is 17.73%. When other gangue depressants (2#-4#) are used, the molybdenum grade and molybdenum recovery in the molybdenum concentrate are lower than the index when the molybdenite depressant is used. The above results show that the use of the molybdenite depressant can selectively oxidize and depress molybdenite, expand the floatability difference between molybdenite and talc, and effectively separate talc and molybdenite.

[0055] Example 2

[0056] A high-talc type refractory molybdenum ore in Henan contains 0.11% Mo. The molybdenum in the raw ore is mainly molybdenite, with a small amount of oxidized molybdenum ore, which is 0.3% in the content of wulfenite and molybdate, and the gangue minerals are mainly calcite, feldspar, quartz and talc, among which the talc content is as high as 30.3%. In the flotation process, a large amount of primary argillization talc and secondary argillization talc generated in the grinding process exist in the process of separation, which causes phenomena such as slurry stickiness, equipment scaling and large amount of reagent consumption. At the same time, the excellent floatability of talc makes it difficult to separate molybdenite and talc, resulting in a low grade of molybdenum concentrate.

[0057] The molybdenite depressant and the beneficiation method for high-talc type molybdenum ore provided by the present application are used for beneficiation.

[0058] The molybdenite depressant is mixed by inorganic reagent combination A and organic reagent combination B at a mass ratio of 3:1, wherein the inorganic reagent combination A is mixed by 5% sodium hypochlorite (NaClO) aqueous solution and 1% ferric chloride (FeCl3) aqueous solution at a mass ratio of 1:2, and the organic reagent combination B is mixed by 0.5% thiamine pyrophosphate aqueous solution and 2% pullulan aqueous solution at a mass ratio of 3:4.

[0059] The process flow is as shown in Figure 2 The whole process closed-circuit test is adopted, and in the test process, the type of the frother is selected as methyl isobutyl carbinol (MIBC), the type of the collector is selected as diesel oil, the concentration of the frother is 1×10 -4 mol / L, and the concentration of the molybdenite depressant is 1×10 -4 mol / L, and the specific steps are as follows:

[0060] S1, grinding: wet ball grinding of the high talc type molybdenum ore, to obtain a grinding product with 85% of -0.074 mm.

[0061] S2, desliming flotation: adding water to the grinding product to form a slurry, and adding a frother to the slurry to perform a desliming flotation operation, which is a roughing, a scavenging, the roughing desliming flotation adding MIBC 60 g / t, stirring for 1 min, and floating for 3 min; the scavenging desliming flotation adding MIBC 60 g / t, stirring for 1 min, and floating for 3 min, to obtain a desliming product and a desliming tailings.

[0062] S3, molybdenum roughing: using water glass and sodium hexametaphosphate as gangue depressants; the molybdenum roughing operation includes a roughing flotation operation (1 time), a pre-concentration operation (3 times), and a rough scavenging operation (3 times).

[0063] S3.1, roughing flotation operation: adding water glass 1500 g / t and sodium hexametaphosphate 500 g / t to the desliming tailings, stirring for 3 min; adding a collector diesel 150 g / t, stirring for 3 min; adding MIBC 30 g / t, stirring for 2 min, and floating for 4 min, to obtain a flotation froth and a flotation underflow.

[0064] S3.2, pre-concentration operation: adding water glass to the flotation froth obtained in S3.1 to start 3 times of pre-concentration operation (pre-concentration 1, pre-concentration 2, and pre-concentration 3), pre-concentration 1 operation adding water glass 600 g / t and sodium hexametaphosphate 200 g / t, each stirring for 2 min, and floating for 3 min; pre-concentration 2 operation adding water glass 300 g / t and sodium hexametaphosphate 100 g / t, each stirring for 2 min, and floating for 3 min; pre-concentration 3 operation adding water glass 200 g / t and sodium hexametaphosphate 60 g / t, each stirring for 2 min, and floating for 3 min; the underflow of the pre-concentration operation returns to the previous operation, and the froth of the last pre-concentration operation obtains a talc-molybdenum mixed concentrate.

[0065] S3.3, rough scavenging operation: adding diesel and MIBC to the flotation underflow obtained in S3.1 to start 3 times of rough scavenging operation (rough scavenging 1, rough scavenging 2, and rough scavenging 3), rough scavenging 1 operation adding diesel 90 g / t and MIBC 10 g / t, each stirring for 2 min, and floating for 3 min; rough scavenging 2 operation adding diesel 90 g / t and MIBC 10 g / t, each stirring for 2 min, and floating for 2 min; rough scavenging 3 operation adding diesel 90 g / t and MIBC 10 g / t, each stirring for 2 min, and each stirring for 2~3 min, and floating for 2 min; the froth of the rough scavenging operation returns to the previous operation, and the underflow of the last rough scavenging operation obtains a roughing tailings.

[0066] S4, molybdenum cleaning: the molybdenum concentrate mixture obtained in step S3.2 is re-ground, and the re-ground product has a fineness of 90% passing 0.038 mm; the molybdenum cleaning operation includes a separation roughing operation (1 time), a separation cleaning operation (3 times), and a separation scavenging operation (3 times); the foregoing molybdenite depressant is used as the gangue depressant;

[0067] S4.1, separation roughing operation: the re-ground product is added with 600 g / t of the molybdenite depressant, stirred for 3 min, and added with 30 g / t of the frother MIBC, stirred for 2 min; the separation roughing operation of talc and molybdenum ore is performed, and the roughing froth and the roughing underflow are obtained after floating for 2-3 min;

[0068] S4.2, the roughing froth obtained in S4.1 is added with the molybdenite depressant to perform 3 times of separation cleaning operation (separation cleaning 1, separation cleaning 2, and separation cleaning 3); the separation cleaning 1 operation is added with 60 g / t of the molybdenite depressant, stirred for 2 min, and floated for 5 min; the separation cleaning 2 operation is added with 30 g / t of the molybdenite depressant, stirred for 2 min, and floated for 4 min; the separation cleaning 3 operation is added with 30 g / t of the molybdenite depressant, stirred for 2 min, and floated for 4 min; the underflow of the separation cleaning operation is returned to the previous operation, and the froth of the last separation cleaning operation is the tailings;

[0069] S4.3, the roughing underflow obtained in S4.1 is added with diesel oil and MIBC to perform 3 times of separation scavenging operation (separation scavenging 1, separation scavenging 2, and separation scavenging 3); the separation scavenging 1 operation is added with 7.5 g / t of diesel oil, stirred for 2 min, and floated for 1.5 min; the separation scavenging 2 operation is added with 10 g / t of MIBC, stirred for 2 min, and floated for 1.5 min; the separation scavenging 3 operation is added with 10 g / t of MIBC, stirred for 2 min, and floated for 1.5 min; the froth of the separation scavenging operation is returned to the previous operation, and the underflow of the last separation scavenging operation is the molybdenum concentrate.

[0070] According to the above process and the dosage of the reagents, the flotation test results are shown in Table 2 as 1#.

[0071] Comparative Example 4

[0072] Different from Example 2, in step S4, dextrin is used as the gangue depressant instead of the molybdenite depressant. Specifically, in step S4.1, 600 g / t of dextrin is used; in step S4.2, separation cleaning 1: 60 g / t of dextrin, separation cleaning 2: 30 g / t of dextrin, and separation cleaning 3: 30 g / t of dextrin; the remaining steps and raw materials are the same as those in Example 2. The flotation test results are shown in Table 2 as 2#.

[0073] Comparative Example 5

[0074] Different from example 2, in step S4, sodium lignosulfonate is used as gangue inhibitor instead of molybdenite inhibitor. Specifically, in step S4.1, the dosage of sodium lignosulfonate is 600 g / t; in step S4.2, the dosages of sodium lignosulfonate in three separation and cleaning operations are 60 g / t, 30 g / t and 30 g / t, respectively; the remaining steps and raw materials are the same as those in example 2. The flotation test results are shown as No. 3 in Table 2.

[0075] Table 2: Results of closed-circuit test of example 2 and comparative examples 5 and 6

[0076]

[0077] As shown in Table 2, under the same dosage of reagents and flotation process, only the type of gangue inhibitor in the separation process is changed, the molybdenum concentrate grade obtained by using the molybdenite inhibitor of the present application is 45.65%, and the molybdenum concentrate recovery rate is 72.36%, while the recovery rate and grade obtained by using dextrin and sodium lignosulfonate are 41.75%, 39.48% and 60.80%, 41.55%, respectively. The recovery rate and grade of the molybdenum concentrate product obtained by using the molybdenite inhibitor are greater than those of the other two reagents. The above results show that the molybdenite inhibitor can selectively oxidize and inhibit molybdenite, effectively separate talc and molybdenite, and effectively improve the molybdenum recovery rate of the mineral product.

[0078] The above examples use the high-selectivity molybdenite inhibitor in the mineral processing process, effectively separate talc and molybdenite, and effectively reduce the dosage of the traditional gangue inhibitor sodium silicate, which has positive benefits for subsequent wastewater treatment, slurry concentration and sedimentation, and effectively reduces the environmental pollution of wastewater.

[0079] The above examples should be understood as examples for more clearly illustrating the present application, and should not be used to limit the scope of the present application. After reading the present application, those skilled in the art can make various modifications to the equivalent forms of the present application, which fall within the scope defined by the appended claims.

Claims

1. The application of a molybdenite inhibitor in the beneficiation of high-talc molybdenum ore, characterized in that, Molybdenite inhibitors consist of components A and B: Component A includes sodium hypochlorite and ferric chloride; Component B includes thiamine pyrophosphate and pullulan; The mass ratio of component A to component B is 1:1.5 to 8:1; the mass ratio of sodium hypochlorite to ferric chloride in component A is 1:6 to 2:1; and the mass ratio of thiamine pyrophosphate to pullulan in component B is 1:8 to 2.5:

1.

2. The application according to claim 1, characterized in that, The mass ratio of component A to component B is 2:1 to 4:1, the mass ratio of sodium hypochlorite to ferric chloride in component A is 1:4 to 2:1.5, and the mass ratio of thiamine pyrophosphate to pullulan in component B is 1:6 to 2:

1.

3. A beneficiation method for high-talc molybdenum ore, characterized in that, Includes the following steps: S1, Grinding: Grinding the high-talc molybdenum ore to obtain a grinding product with 75-85% of the particles being -0.074mm. S2, Desliming flotation: Water is added to the grinding product to prepare a slurry, and a frother is added to the slurry to carry out desliming flotation to obtain deslimed product and deslimed tailings; S3, Molybdenum roughing: Gangue inhibitors, collectors, and frothers are added to the desliming tailings for roughing flotation, resulting in flotation froth and flotation underflow; gangue inhibitors are added to the flotation froth to initiate multiple pre-cleaning operations, and the underflow from the pre-cleaning operations is returned to the previous operation. The froth from the final pre-cleaning operation yields a talc-molybdenum mixed concentrate; collectors and frothers are added to the flotation underflow to initiate multiple roughing scavenging operations, and the froth from the roughing scavenging operations is returned to the previous operation. The underflow from the final roughing scavenging operation yields roughing tailings. S4, Molybdenum Concentration: The talc-molybdenum mixed concentrate is regrinded, and the fineness of the regrinded product is -0.038mm, accounting for 85~95%; molybdenite inhibitor and frother are added to the regrinded product for roughing separation, resulting in roughing froth and roughing underflow; molybdenite inhibitor is added to the roughing froth for multiple separation and concentration operations, and the underflow from the separation and concentration operations is returned to the previous operation. The froth from the last separation and concentration operation yields the concentrate tailings; collector and frother are added to the roughing underflow for multiple separation and scavenging operations, and the froth from the separation and scavenging operations is returned to the previous operation. The underflow from the last separation and scavenging operation yields the molybdenum concentrate. The molybdenite inhibitor comprises component A and component B: Component A includes sodium hypochlorite and ferric chloride; Component B includes thiamine pyrophosphate and pullulan; The mass ratio of component A to component B is 1:1.5 to 8:1; the mass ratio of sodium hypochlorite to ferric chloride in component A is 1:6 to 2:1; and the mass ratio of thiamine pyrophosphate to pullulan in component B is 1:8 to 2.5:

1.

4. The mineral processing method according to claim 3, characterized in that, In step S1, the molybdenum grade of the raw ore is 0.05~0.2%.

5. The mineral processing method according to claim 3, characterized in that, In step S2, the desliming flotation includes two desliming flotation processes, and the amount of frother added is 10~100g / t.

6. The mineral processing method according to claim 3, characterized in that, In step S3, the molybdenum roughing operation includes one roughing flotation operation, three pre-cleaning operations, and three roughing scavenging operations. In the roughing flotation operation, the amount of gangue inhibitor added is 600~3000 g / t; the amount of collector added is 100~200 g / t; and the amount of frother added is 10~50 g / t. In the first pre-cleaning operation, the amount of gangue inhibitor added is 400~1500 g / t. In the latter two pre-cleaning operations, the amount of gangue inhibitor added is 150~700 g / t. In the three roughing scavenging operations, the amount of collector added is 30~120 g / t; and the amount of frother added is 5~20 g / t.

7. The mineral processing method according to claim 3, characterized in that, In step S4, the molybdenum refining operation includes a primary separation roughing operation, a secondary separation refining operation, and a secondary separation scavenging operation; In the roughing and separation operation, the amount of molybdenite inhibitor added is 300-800 g / t, and the amount of frother added is 20-40 g / t; in the separation and cleaning operation, the amount of molybdenite inhibitor added in the first separation and cleaning operation is 20-100 g / t, and the amount of molybdenite inhibitor added in the subsequent two separation and cleaning operations is 20-60 g / t; in the separation and scavenging operation, 5-15 g / t of collector is added in the first separation and scavenging operation, and 5-15 g / t of frother is added in the subsequent two separation and scavenging operations.

8. The mineral processing method according to any one of claims 3-7, characterized in that, In step S4, the concentration of the molybdenite inhibitor is ≥1×10⁻⁶. -4 mol / L.

9. The mineral processing method according to any one of claims 3-7, characterized in that, In steps S2 to S4, the concentration of the foaming agent is 1×10⁻⁶. -6 mol / L ~ 1×10 -4 mol / L.

10. The mineral processing method according to any one of claims 3-7, characterized in that, The gangue inhibitor is water glass and sodium hexametaphosphate in a weight ratio of 0.5 to 20:1; the collector is diesel oil; the foaming agent is one or more of terpineol, cresol, dipyridine, methyl isobutyl alcohol, eucalyptus oil, camphor oil, higher alcohols and synthetic foaming agents.

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