Molybdenite inhibitor apasp and application, beneficiation method

Abstract

The application discloses a molybdenite inhibitor APASP and application and a beneficiation method, and the molybdenite inhibitor APASP comprises polyaspartic acid sodium and concentrated hydrochloric acid, and the mass ratio is (5-10):1; when used, two components are respectively configured as aqueous solutions, the mass concentration of the polyaspartic acid sodium aqueous solution is 0.5%-2.5%, the mass concentration of the HCl aqueous solution is 1.0%-5.0%, and the two aqueous solutions are mixed according to the mass ratio (2.5-10):(1-2.5) to obtain the molybdenite inhibitor APASP. The polyaspartic acid sodium is acidified to obtain the molybdenite inhibitor APASP, the molybdenite can be selectively inhibited according to the existing form of the APASP in the ore pulp, and the talc is not affected. The application can improve the beneficiation difficulty of high-talc molybdenum ore, effectively improve the recovery of molybdenum, and has the inhibiting capacity, high selectivity and strong chelating capacity compared with the existing inhibitors, has a large application prospect, and has the scale inhibition capacity, can effectively reduce the equipment scaling, is an excellent green water treatment agent, and can prevent the secondary pollution of water bodies.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of mineral flotation, and particularly relates to a molybdenite depressant APASP and application and a beneficiation method. BACKGROUND

[0002] With the continuous exploitation and utilization of rich ores and easily selected minerals, complex, lean and difficult-to-process molybdenum resources cannot be recovered by gravity separation and other physical methods, and flotation is the main method for selecting high-talc molybdenum ores. The commonly used talc depressant in China is water glass, and a large amount of water glass is often added in the flotation process, which can cause difficult slurry settling and difficult recycling of water, and the water glass has a weak effect on depressing talc. Therefore, reverse flotation is used to float talc with better natural floatability and to depress molybdenite. The commonly used molybdenite depressants currently include dextrin, starch, sodium lignosulfonate and dextran, but these existing depressants have poor selectivity and weak depressing effect.

[0003] Therefore, it is of great significance to develop a high-efficiency molybdenite depressant for separating molybdenite from talc by reverse flotation, so as to improve the comprehensive utilization rate of molybdenum resources. SUMMARY

[0004] In view of the problems that the effect of water glass on depressing talc is not strong, and the existing molybdenite depressants have poor selectivity and weak depressing effect in reverse flotation, the application provides a molybdenite depressant APASP and application and a beneficiation method, which aims to efficiently depress molybdenite by using the molybdenite depressant, so as to separate molybdenite from talc by reverse flotation.

[0005] To achieve the above-mentioned purpose, the application adopts the following technical solutions:

[0006] A molybdenite depressant APASP, an active component of the molybdenite depressant APASP comprises polyaspartic acid sodium and concentrated hydrochloric acid, and the mass ratio is (5-10):1; the chemical structural formula of the polyaspartic acid sodium is:

[0007]

[0008] wherein n is 10-40; m is 10-40; and the relative molecular mass is 1000-10000.

[0009] Polyaspartic acid sodium (PASP) is a biological polymer and is an environment-friendly green chemical product with non-toxicity, easy degradation and easy configuration. Polyaspartic acid sodium contains active groups such as peptide bonds and carboxyl groups, and these groups have strong hydrophilic ability, which endows PASP with chelation, dispersion, adsorption and other effects. In a natural state, the natural pH of PASP is between 8 and 9, at which time PASP mainly exists in the form of L 4- , H 3- L and H2L2- Dissolved in solution, but in the ore pulp, the isoelectric point of molybdenite surface is between 2-3, its surface often carries a large amount of negative charge, so it is difficult to be affected by anion depressant, and PASP has almost no inhibitory effect on molybdenite. Because of the multi-level deprotonation ability of PASP, the APASP obtained after acidification using concentrated hydrochloric acid (36%-38% HCl) exists in the form of H4L and H3L in the ore pulp, and the lower negative charge weakens the electrostatic repulsion between the molybdenite surface and H4L, H3L - Therefore, APASP can act on the molybdenite surface at this time, and two kinds of adsorption relationships mainly occur, one is that a strong chelation occurs between the molybdenite surface metal ions and APASP through chemical adsorption, which is related to the active polypeptide bond and carboxyl group contained in APASP; the other is that the H4L form of APASP in the molecular state exists after acidification, and physical adsorption is formed on the molybdenite through the action of dispersion force. When APASP completes adsorption on the molybdenite surface, the polycarboxyl and peptide bond on the surface of APASP will play a hydrophilic role to make the molybdenite be inhibited in the ore pulp, and the metal ions on the surface of talc have weak chelation ability with APASP, and the talc surface charge is more saturated, so it is not easy to have van der Waals force with APASP, so that the talc is not affected by APASP in the ore pulp and is hydrophobic and floats up.

[0010] Further, the mass ratio of the polyaspartic acid sodium and the concentrated hydrochloric acid is 8:1.

[0011] Acidification of polyaspartic acid sodium (PASP) using concentrated hydrochloric acid can avoid oxidation, and if other inorganic acids such as sulfuric acid and nitric acid are used for acidification, oxidation will occur, which will affect the generation of APASP.

[0012] Further, the molybdenite depressant APASP is configured into an aqueous solution by the polyaspartic acid sodium, concentrated hydrochloric acid is diluted into an HCl aqueous solution, and the two aqueous solutions are mixed according to the mass ratio (2.5-10):(1-2.5); wherein the mass concentration of the polyaspartic acid sodium aqueous solution is 0.5%-2.5%, and the mass concentration of the HCl aqueous solution is 1.0%-5.0%.

[0013] Further, the mass concentration of the polyaspartic acid sodium aqueous solution is 0.5%-1.5%, the mass concentration of the HCl aqueous solution is 1.5%-2.5%, and the mass ratio of the polyaspartic acid sodium aqueous solution to the HCl aqueous solution is 4:(1-2).

[0014] Preferably, the mass concentration of the polyaspartic acid sodium aqueous solution is 1.0%.

[0015] Preferably, the mass concentration of the HCl aqueous solution is 2.0%.

[0016] The application further provides application of the above-described molybdenite depressant APASP in high-talc molybdenite beneficiation.

[0017] Based on the same inventive concept, the application further provides a method for high-talc molybdenite beneficiation using the above-described molybdenite depressant APASP, comprising the following steps:

[0018] (1) Grinding: grinding the raw ore to obtain a slurry I with a fineness of 65% to 75% of -74 μm;

[0019] (2) adding the depressant I, the depressant II, the collector and the frother into the slurry I, and sequentially performing one to two times of mixed flotation, one to two times of pre-concentration and one to three times of rough scavenging to obtain a molybdenite-talc mixed concentrate and a roughing tailing; wherein the middlings of the pre-concentration and the rough scavenging are sequentially returned to the previous operation;

[0020] (3) regrinding the molybdenite-talc mixed concentrate to obtain a slurry II with a fineness of 87% to 95% of -38 μm;

[0021] (4) adding the molybdenite depressant APASP and the frother into the slurry II, and sequentially performing rough separation, one to two times of separation concentration and one to two times of separation scavenging to obtain a talc-enriched concentrate product and a molybdenum-enriched underflow product; wherein the middlings of the separation concentration and the separation scavenging are sequentially returned to the previous operation.

[0022] Further, in step (1), the molybdenum grade of the raw ore is 0.08% to 0.5%, and wet ball milling is used for grinding.

[0023] Further, in step (2), the inhibitor I is sodium hexametaphosphate, the inhibitor II is sodium sulfite, the collector is kerosene, and the frother is methyl isobutyl carbinol (MIBC); the relative dosages of sodium hexametaphosphate, sodium sulfite, kerosene, and MIBC in the primary and secondary mixed flotation are 50-300 g / t, 100-200 g / t, 10-30 g / t, and 20-60 g / t, respectively, each for 2-3 min of stirring and 3-5 min of flotation, to obtain molybdenite-talc mixed flotation concentrate and molybdenite-talc mixed flotation underflow; the molybdenite-talc mixed flotation concentrate is subjected to one to two times of pre-concentration, wherein: the relative dosages of sodium hexametaphosphate, sodium sulfite, kerosene, and MIBC in the primary pre-concentration are 20-200 g / t, 50-100 g / t, 5-10 g / t, and 10-30 g / t, respectively, each for 2-3 min of stirring and 2-3 min of flotation; the relative dosages of sodium hexametaphosphate, sodium sulfite, and MIBC in the secondary pre-concentration are 15-150 g / t, 50-100 g / t, and 10-30 g / t, respectively, each for 2-3 min of stirring and 2-3 min of flotation, to obtain molybdenite-talc mixed concentrate; the molybdenite-talc mixed flotation underflow is subjected to one to three times of rough scavenging, wherein: the relative dosages of sodium hexametaphosphate, sodium sulfite, kerosene, and MIBC in the primary rough scavenging are 50-300 g / t, 50-200 g / t, 10-30 g / t, and 5-20 g / t, respectively, each for 2-3 min of stirring and 2-4 min of flotation; the relative dosages of kerosene and MIBC in the secondary rough scavenging are 10-20 g / t and 5-10 g / t, respectively, each for 2-3 min of stirring and 2-3 min of flotation; the relative dosages of kerosene and MIBC in the tertiary rough scavenging are 5-10 g / t and 2-5 g / t, respectively, each for 2-3 min of stirring and 2-3 min of flotation, to obtain roughing tailings.

[0024] Further, in step (3), the regrinding is performed by wet ball milling.

[0025] Further, in step (4), the frother is methyl isobutyl carbinol (MIBC); the relative raw ore dosage of the separation roughing is: first adding molybdenite depressant APASP 100-200 g / t, stirring for 2-3 min, then adding MIBC 10-30 g / t, stirring for 1-3 min, and floating for 2-3 min to obtain a separation roughing froth product and a separation roughing underflow product; the separation roughing froth product is subjected to one to two separation cleaning operations, wherein: the relative raw ore dosage of the one separation cleaning operation is molybdenite depressant APASP 50-100 g / t, stirring for 2-3 min, and floating for 1-2 min; the relative raw ore dosage of the two separation cleaning operations is molybdenite depressant APASP 25-50 g / t, stirring for 2-3 min, and floating for 1-2 min to obtain a molybdenite concentrate product; the separation roughing underflow product is subjected to one to two separation cleaning operations, wherein: the relative raw ore dosage of the one separation cleaning operation is molybdenite depressant APASP 10-15 g / t and MIBC 10-30 g / t, stirring for 1-3 min, and floating for 2-3 min; the relative raw ore dosage of the two separation cleaning operations is molybdenite depressant APASP 5-10 g / t and MIBC 10-20 g / t, stirring for 1-3 min, and floating for 2-3 min to obtain a molybdenite-rich underflow product.

[0026] Further, the mass concentration of the molybdenite depressant APASP is 5-15 g / L.

[0027] Preferably, the mass concentration of the molybdenite depressant APASP is 10 g / L.

[0028] The molybdenite depressant APASP provided by the application is obtained by acidizing polyaspartic acid sodium (PASP), and the surface hydrophilicity of molybdenite is changed by the adsorption relationship between APASP and molybdenite in the ore slurry, so that the molybdenite is hydrophilically inhibited and retained in the underflow product, while the talc is not affected by APASP and is hydrophobically floated, thereby realizing efficient separation of molybdenite and talc by reverse flotation.

[0029] Compared with the prior art, the application has the following beneficial effects:

[0030] 1. The molybdenite depressant APASP is obtained by acidizing polyaspartic acid sodium in a certain proportion, and by the chemical adsorption and physical adsorption relationship, APASP can selectively and strongly inhibit molybdenite, so that the surface of molybdenite is hydrophilic, while the talc is not inhibited, thereby separating molybdenite and talc, achieving reverse flotation of talc, and obtaining molybdenite concentrate in the underflow.

[0031] 2. The molybdenite inhibitor APASP provided in this invention is obtained by acidification with sodium polyaspartate (PASP). It is easy to prepare, non-toxic and pollution-free, green and efficient, and requires less reagent, thus having high economic benefits.

[0032] 3. The molybdenite inhibitor APASP provided in this invention has strong chelating ability and scale inhibition ability, which can effectively reduce scale buildup in equipment. It is an excellent green water treatment agent that can prevent secondary pollution of water bodies.

[0033] 4. The molybdenite inhibitor APASP provided in this invention can achieve better molybdenum concentrate grade and molybdenum concentrate recovery rate in flotation when applied, and has great industrial application prospects.

[0034] Instruction manual illustrations

[0035] Figure 1 This is a schematic diagram of the process flow of one embodiment of the present invention. Detailed Implementation

[0036] 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.

[0037] Example 1

[0038] Sample No. 1 of a high-talc-type, difficult-to-process molybdenum ore in Henan Province contained 0.13% Mo. The main minerals in the raw ore included molybdenite, talc, magnetite, feldspar, and pyrite. Molybdenite was the primary form of molybdenum, accounting for 97%, with talc content being relatively high at 13.3%. Due to the good natural floatability of talc, a large amount of talc floated during flotation, resulting in a low grade for this type of molybdenum ore, often failing to meet the national standard minimum molybdenum concentrate level of 45%.

[0039] Mineral processing tests were conducted using the molybdenite inhibitor APASP provided by this invention and its application. The mineral processing flow and reagent system are as follows: Figure 1 As shown, in this embodiment, the beneficiation of molybdenite adopts a process of mixed flotation of molybdenite and talc, pre-cleaning of mixed flotation concentrate, regrinding of mixed concentrate, and reverse flotation separation of molybdenite and talc. In the process, mixed flotation separates molybdenite and talc from a large amount of gangue minerals such as feldspar, quartz, and pyrite. Then, the pre-cleaning operation further removes these gangue ores, ensuring that the mixed concentrate entering the molybdenite and talc separation and cleaning operation is almost free of these gangue minerals, so as to ensure the grade of molybdenum concentrate in reverse flotation.

[0040] Preparation of molybdenite inhibitor APASP: polyaspartic acid sodium is prepared into an aqueous solution, concentrated hydrochloric acid (37% HCl) is diluted with water into an aqueous HCl solution, the mass concentration of the aqueous polyaspartic acid sodium solution is 1.0%, the mass concentration of the aqueous HCl solution is 2%, and then the two aqueous solutions are mixed according to a mass ratio of 10:1 to prepare the molybdenite inhibitor APASP; and the prepared APASP is stored for later use.

[0041] The beneficiation process adopts a full-flow closed-circuit test: after secondary mixed roughing, secondary pre-concentration and three-time rough scavenging, molybdenite-talc mixed concentrate is obtained, and the molybdenite-talc mixed concentrate is subjected to separation roughing, twice separation concentration and twice separation scavenging, which specifically includes the following steps:

[0042] (1) The raw ore is ground by wet ball milling to obtain a slurry I with a fineness of about 70% passing 74 μm.

[0043] (2) Secondary mixed roughing: the first mixed flotation is added with sodium hexametaphosphate 200 g / t, sodium sulfite 200 g / t, kerosene 25 g / t and MIBC 30 g / t, each for 2 min of stirring and 5 min of flotation; the second mixed flotation is added with sodium hexametaphosphate 200 g / t, sodium sulfite 150 g / t, kerosene 20 g / t and MIBC 20 g / t, each for 2 min of stirring and 4 min of flotation, to obtain molybdenite-talc mixed flotation concentrate and molybdenite-talc mixed flotation underflow.

[0044] (3) Secondary pre-concentration: the molybdenite-talc mixed flotation concentrate is subjected to secondary pre-concentration. The first pre-concentration is added with sodium hexametaphosphate 100 g / t, sodium sulfite 80 g / t, kerosene 10 g / t and MIBC 20 g / t, each for 2 min of stirring and 2 min of flotation; the second pre-concentration is added with sodium hexametaphosphate 50 g / t, sodium sulfite 50 g / t and MIBC 10 g / t, each for 2 min of stirring and 2 min of flotation. The pre-concentration middlings are sequentially returned to the previous operation; and the molybdenite-talc mixed concentrate is obtained.

[0045] (4) Three-time rough scavenging: the molybdenite-talc mixed flotation underflow is subjected to three-time rough scavenging. The first scavenging is added with sodium hexametaphosphate 200 g / t, sodium sulfite 150 g / t, kerosene 20 g / t and MIBC 20 g / t, each for 2 min of stirring and 4 min of flotation; the second scavenging is added with kerosene 10 g / t and MIBC 10 g / t, each for 2 min of stirring and 3 min of flotation; the third scavenging is added with kerosene 10 g / t and MIBC 5 g / t, each for 2 min of stirring and 2.5 min of flotation; the rough scavenging middlings are sequentially returned to the previous operation; and the roughing tailings are obtained.

[0046] (5) The molybdenite-talc mixed concentrate is re-ground by wet ball milling to ensure that the slurry II has a fineness of 90% passing 38 μm. The slurry II is subjected to a separation roughing operation, 100 g / t of the molybdenite depressant APASP is added thereto, stirred for 2 min, 20 g / t of MIBC is added thereto, stirred for 1 min, and floated for 3 min to obtain a separation roughing froth and a separation roughing underflow.

[0047] (6) Secondary separation cleaning operation: the separation roughing froth is subjected to a secondary separation cleaning operation, 50 g / t of the molybdenite depressant APASP is added in the first separation cleaning, stirred for 2 min, and floated for 2 min; 25 g / t of the molybdenite depressant APASP is added in the second separation cleaning, stirred for 2 min, and floated for 2 min, and the separation cleaning middlings are sequentially returned to the previous operation; and a talc-enriched concentrate product is obtained.

[0048] (7) Secondary separation scavenging operation: the separation roughing underflow is subjected to a secondary separation scavenging operation, 15 g / t of the molybdenite depressant APASP is added in the first separation scavenging, stirred for 2 min, 15 g / t of MIBC is added thereto, stirred for 1 min, and floated for 3 min; 10 g / t of the molybdenite depressant APASP is added in the second separation scavenging, 10 g / t of MIBC is added thereto, stirred for 1 min, and floated for 2 min, and the separation scavenging middlings are sequentially returned to the previous operation; and a molybdenum-enriched underflow product is obtained.

[0049] The beneficiation test results are shown in 1-1# in Table 1.

[0050] Comparative Example 1

[0051] The beneficiation process flow of Example 1 is repeated, except that the molybdenite depressant APASP is replaced by dextran in the separation roughing, separation cleaning and separation scavenging operations, and the dosage remains unchanged, and the beneficiation test results are shown in 2-1# in Table 1.

[0052] Comparative Example 2

[0053] The beneficiation process flow of Example 1 is repeated, except that the molybdenite depressant APASP is replaced by starch in the separation roughing, separation cleaning and separation scavenging operations, and the dosage remains unchanged, and the beneficiation test results are shown in 3-1# in Table 1.

[0054] Comparative Example 3

[0055] The beneficiation process flow of Example 1 is repeated, except that the molybdenite depressant APASP is replaced by sodium humate in the separation roughing, separation cleaning and separation scavenging operations, and the dosage remains unchanged, and the beneficiation test results are shown in 4-1# in Table 1.

[0056] Comparative Example 4

[0057] The beneficiation process flow of Example 1 was repeated, except that in the separation roughing, separation cleaning and separation scavenging operations, the molybdenite depressant APASP was replaced by sodium lignosulfonate, and the dosage was unchanged. The beneficiation test results are shown in 5-1# in Table 1.

[0058] Comparative Example 5

[0059] The beneficiation process flow of Example 1 was repeated, except that in the separation roughing, separation cleaning and separation scavenging operations, the molybdenite depressant APASP was replaced by sodium lignosulfonate, and the dosage was unchanged. The beneficiation test results are shown in 5-1# in Table 1.

[0060] Table 1: Comparison of closed-circuit test results of Example 1 and Comparative Examples 1-5

[0061]

[0062]

[0063] As can be seen from the results in Table 1, by performing a closed-circuit process test on the types of molybdenite depressants for a certain high talc molybdenite ore sample 1# under the same flotation process, it was found that the molybdenite depressant APASP (1-1#) provided by the present application obtained a molybdenum concentrate grade of 48.27%, a molybdenum concentrate recovery rate of 74.26%, and a molybdenum concentrate grade exceeding the national minimum standard of 45%. Test numbers 2-1# to 5-1# are the corresponding closed-circuit indicators of Comparative Examples 1 to 4, respectively. It was found that the indicators of 2-1# and 3-1# had insufficient inhibition of molybdenite when starch and dextran were used, resulting in a large amount of molybdenite being lost from talc, and the starch and dextran also partially inhibited talc, resulting in insufficient molybdenum concentrate grade. The indicator of 4-1# showed that sodium humate had poor molybdenite inhibition ability, resulting in a large loss of molybdenum metal and a low recovery rate of only 48.75%. The indicator of 5-1# showed that sodium lignosulfonate had strong inhibition of both molybdenite and talc, resulting in a low talc concentrate yield and a large amount of talc being inhibited, and a low molybdenum concentrate grade of only 30.11% in the reverse flotation underflow. In group 6-1#, unacidified polyaspartic acid sodium (PASP) was used, and according to the indicator, it was found that the unacidified polyaspartic acid sodium had almost no selective molybdenite inhibition ability, the concentrate yield at the tank bottom was extremely low at only 0.08%, both molybdenite and talc floated, the molybdenum loss reached 57.10%, and the molybdenum recovery rate was only 29.31%, indicating that acidification treatment enabled polyaspartic acid sodium to exhibit strong selective inhibition ability.

[0064] The above results show that the molybdenite inhibitor APASP provided by the application has strong molybdenite inhibiting ability and almost no selectivity of talc, and good indexes are obtained.

[0065] The above-mentioned embodiments should be understood as merely illustrative of the application, and should not be used to limit the scope of the application, and after reading the application, various equivalent modifications of the application by those skilled in the art fall within the scope defined by the claims attached to the application.

Claims

1. Use of molybdenite depressant APASP in beneficiation of high talc type molybdenum ore, characterized by, The active components of the molybdenite inhibitor APASP include polyaspartic acid sodium and concentrated hydrochloric acid, and the mass ratio is (5-10):1; the chemical structural formula of the polyaspartic acid sodium is: ； Wherein, n is 10-40; m is 10-40; the relative molecular mass is 1000-10000.

2. Use according to claim 1, characterized in that, The mass ratio of the polyaspartic acid sodium and the concentrated hydrochloric acid is 8:

1.

3. Use according to claim 1 or 2, characterized in that, The molybdenite inhibitor APASP is configured into an aqueous solution by the polyaspartic acid sodium, the concentrated hydrochloric acid is diluted into an aqueous solution of HCl, and the two aqueous solutions are mixed according to the mass ratio (2.5-10):(1-2.5); wherein the mass concentration of the polyaspartic acid sodium aqueous solution is 0.5%-2.5%, and the mass concentration of the HCl aqueous solution is 1.0%-5.0%.

4. Use according to claim 3, characterized in that, The mass concentration of the polyaspartic acid sodium aqueous solution is 0.5%-1.5%, the mass concentration of the HCl aqueous solution is 1.5%-2.5%, and the mass ratio of the polyaspartic acid sodium aqueous solution to the HCl aqueous solution is 4:(1-2).

5. A method for beneficiation of high talc type molybdenum ore using molybdenite depressant APASP, characterized by, The method comprises the following steps: (1) grinding: grinding the raw ore to obtain a pulp I with a fineness of 65%-75% of -74 μm; (2) adding the inhibitor I, the inhibitor II, the collecting agent and the frother into the pulp I, and sequentially performing one to two times of mixed flotation, one to two times of pre-concentration and one to three times of rough scavenging to obtain a molybdenite-talc mixed concentrate and a roughing tailing; wherein the middlings of the pre-concentration and the rough scavenging are sequentially returned to the previous operation; (3) regrinding the molybdenite-talc mixed concentrate to obtain a pulp II with a fineness of 87%-95% of -38 μm; (4) adding the molybdenite inhibitor APASP and the frother into the pulp II, and sequentially performing rough separation, one to two times of separation concentration and one to two times of separation scavenging to obtain a talc-rich concentrate product and a molybdenum-rich underflow product; wherein the middlings of the separation concentration and the separation scavenging are sequentially returned to the previous operation; The active components of the molybdenite inhibitor APASP include polyaspartic acid sodium and concentrated hydrochloric acid, and the mass ratio is (5-10):1; the chemical structural formula of the polyaspartic acid sodium is: ； Wherein, n is 10-40; m is 10-40; the relative molecular mass is 1000-10000.

6. The method of claim 5, wherein, In step (1), the molybdenum grade of the raw ore is 0.08%-0.5%, and wet ball milling is adopted for grinding.

7. The method of claim 5, wherein, In step (2), the inhibitor I is sodium hexametaphosphate, the inhibitor II is sodium sulfite, the collector is kerosene, and the frother is MIBC; the relative dosages of the sodium hexametaphosphate, the sodium sulfite, the kerosene, and the MIBC in the primary and secondary mixed flotation are 50-300 g / t, 100-200 g / t, 10-30 g / t, and 20-60 g / t, respectively; the relative dosages of the sodium hexametaphosphate, the sodium sulfite, the kerosene, and the MIBC in the primary pre-concentration are 20-200 g / t, 50-100 g / t, 5-10 g / t, and 10-30 g / t, respectively; the relative dosages of the sodium hexametaphosphate, the sodium sulfite, and the MIBC in the secondary pre-concentration are 15-150 g / t, 50-100 g / t, and 10-30 g / t, respectively; in the primary to tertiary rough scavenging operations, the relative dosages of the sodium hexametaphosphate, the sodium sulfite, the kerosene, and the MIBC in the primary rough scavenging are 50-300 g / t, 50-200 g / t, 10-30 g / t, and 5-20 g / t, respectively; the relative dosages of the kerosene and the MIBC in the secondary rough scavenging are 10-20 g / t and 5-10 g / t, respectively; the relative dosages of the kerosene and the MIBC in the tertiary rough scavenging are 5-10 g / t and 2-5 g / t, respectively.

8. The method of claim 5, wherein, In step (3), the regrinding is performed by wet ball milling.

9. The method of claim 5, wherein, In step (4), the frother is MIBC; the relative dosages of the molybdenite inhibitor APASP and the MIBC in the separation roughing are 100-200 g / t and 10-30 g / t, respectively; in the primary to secondary separation cleaning operations, the relative dosage of the molybdenite inhibitor APASP in the primary separation cleaning is 50-100 g / t; the relative dosage of the molybdenite inhibitor APASP in the secondary separation cleaning is 25-50 g / t; in the primary to secondary separation scavenging operations, the relative dosages of the molybdenite inhibitor APASP and the MIBC in the primary separation scavenging are 10-15 g / t and 10-30 g / t, respectively; the relative dosages of the molybdenite inhibitor APASP and the MIBC in the secondary separation scavenging are 5-10 g / t and 10-20 g / t, respectively.

10. The method according to any one of claims 5 to 9, characterized in that, The mass concentration of the molybdenite inhibitor APASP is 5-15 g / L.

11. The method according to any one of claims 5 to 9, characterized in that, The mass concentration of the molybdenite inhibitor APASP is 10 g / L.

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