A method for separating molybdenite and chalcopyrite based on surface oxidation

Abstract

The present invention provides a method for separating molybdenite and chalcopyrite based on surface oxidation, belonging to the technical field of mineral separation. In this method, molybdenite and chalcopyrite are ground finely. The ground materials are taken and added with water and put into the flotation cell of a flotation machine. After adding hydrogen peroxide and stirring, ultrasonic treatment is carried out for 3 - 5 minutes. After the treatment, the pH of the pulp is adjusted with a pH adjuster, collector kerosene and foaming agent MIBC are added and stirred for 1 - 5 minutes, and then air flotation is carried out to obtain concentrate and tailing products. Under the action of an oxidant, the surface of molybdenite is oxidized, and the oxidation products generated on the surface of molybdenite will fall off during ultrasonic treatment. This oxidation product will inhibit the flotation of chalcopyrite but will not inhibit the flotation of molybdenite. This method can achieve the flotation separation of molybdenite and chalcopyrite without using inhibitors, thereby reducing the reagent cost.

Description

Technical Field

[0001] The present invention relates to the technical field of mineral separation, and particularly to a method for separating molybdenite and chalcopyrite based on surface oxidation. Background Art

[0002] Molybdenum is a rare metal and strategic resource that plays an important role in promoting the development of the national economy. It has high melting point, high temperature resistance and good hot hardness, etc., and is widely used in fields such as machinery manufacturing, aerospace, electronics, military and chemical industry. Molybdenum is widely used in strategic emerging industries, generating new huge demands. However, with the large-scale exploitation of resources, molybdenum resources are becoming increasingly poor, fine and complex, affecting the efficient utilization of molybdenum resources. Molybdenite is the main source for extracting molybdenum, and molybdenite often coexists with chalcopyrite. Copper-molybdenum separation is a recognized technical problem in the field, and researchers at home and abroad have conducted a large number of studies on such ores.

[0003] Since the grade of molybdenum in copper-molybdenum ores is generally very low, a copper-molybdenum bulk flotation - copper-molybdenum separation flotation process is often adopted. The copper-molybdenum concentrate obtained by bulk flotation adsorbs collector, and has good and similar floatability. In order to enlarge the surface property difference between molybdenite and chalcopyrite and reduce the influence of the collector adsorbed on the mineral surface, generally chemical agents or heating and other methods are used to carry out de-drug treatment on the copper-molybdenum bulk concentrate.

[0004] For the copper-molybdenum separation flotation process, considering the complexity of the flotation process and the treatment cost, the "depressing copper and floating molybdenum" flotation process is mostly adopted in industry. However, since the molybdenum content in the selected copper-molybdenum bulk concentrate is still too low, a large amount of copper ore inhibitor needs to be added during the copper-molybdenum separation process. Relatively speaking, for the copper-molybdenum separation operation, the production cost of molybdenum concentrate is relatively high. Taking sodium sulfide as an inhibitor as an example, the dosage should at least ensure 10 kg / t, and sometimes even reach 50 - 70 kg / t to meet the separation requirements of the copper-molybdenum bulk concentrate. The cost of sodium sulfide accounts for about 80% - 90% of the total cost of molybdenum separation, resulting in losses or inability to recover in molybdenum separation. Therefore, studying the inhibitory effect of the oxidation products of minerals themselves on chalcopyrite is of great significance for reducing the cost of flotation reagents and realizing the efficient utilization of refractory copper-molybdenum ores. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a method for separating molybdenite and chalcopyrite based on surface oxidation, and solve the technical problem of difficult beneficiation for efficient flotation separation of molybdenite and chalcopyrite.

[0006] The method comprises the following steps:

[0007] S1: Grinding the raw ore mixture of molybdenite and chalcopyrite finely;

[0008] Put the ground material into the flotation cell of the flotation machine after adding water, add hydrogen peroxide and stir for 5 min, then treat it with ultrasonic waves for 3 - 5 min to obtain the treated pulp;

[0009] S2: Add a pH adjuster to the pulp treated in S1 to adjust the pH of the obtained pulp, then add a collector and stir for 3 - 5 min, and finally add a foaming agent and stir for 1 min, and carry out air flotation to obtain flotation foam and in - cell product. The flotation foam is molybdenite, and the in - cell product is chalcopyrite.

[0010] Among them, in S1, the mixture raw material of molybdenite and chalcopyrite is ground to a particle size less than 74 μm.

[0011] In S1, the mass ratio of the mixture raw material to water is 1:(30 - 50); the dosage of hydrogen peroxide is 0.5×10 -5 -1.5×10 - 5 mol / L. Hydrogen peroxide is prepared into a solution of 4×10 -4 mol / L for addition.

[0012] In S2, the pH of the pulp is adjusted to 7 - 9, and the pH adjuster used is hydrochloric acid or sodium hydroxide.

[0013] In S2, the collector is kerosene, and the dosage is 20 - 40 mg / L; the foaming agent is MIBC, and the dosage is 0.5×10 -4 -1×10 - 4 mol / L. Kerosene is prepared into a solution with a concentration of 1 g / L for addition, and MIBC is prepared into a solution of 4×10 -3 mol / L for addition.

[0014] The beneficial effects of the above - mentioned technical solutions of the present invention are as follows:

[0015] In the above - mentioned solution, by using the characteristic that the dissolved products generated by the oxidation of molybdenite have a selective inhibitory effect on chalcopyrite but no inhibitory effect on molybdenite, the flotation separation of molybdenite and chalcopyrite can be realized without adding inhibitors, effectively reducing the cost of flotation reagents and having remarkable economic benefits. Specific Embodiments

[0016] To make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will be described in detail with specific embodiments.

[0017] The present invention provides a method for separating molybdenite and chalcopyrite based on surface oxidation.

[0018] The method includes the following steps:

[0019] S1: Grind the mixture raw ore of molybdenite and chalcopyrite;

[0020] S2: Put the ground material into the flotation cell of the flotation machine after adding water, add hydrogen peroxide and stir for 5 min, then treat it with ultrasonic waves for 3 - 5 min to obtain the treated pulp.

[0021] S3: Add a pH adjuster to the treated pulp to adjust the pH of the obtained pulp, then add a collector and stir for 3 - 5 min, and finally add a frother and stir for 1 min, and conduct air flotation to obtain flotation foam and in - trough product. The flotation foam is molybdenite, and the in - trough product is chalcopyrite.

[0022] Example 1

[0023] Grind 2 g of the mixed molybdenite and chalcopyrite materials to a particle size less than 74 μm, add 40 mL of water and 1 mL of hydrogen peroxide with a concentration of 4×10 -4 mol / L and stir for 5 min, conduct ultrasonic treatment for 5 min, adjust the pH of the obtained pulp to 7 with a pH adjuster, add 1 mL of collector kerosene with a concentration of 1 g / L and stir for 3 min, 1 mL of frother MIBC with a concentration of 4×10 -3 mol / L and stir for 1 min, then conduct air flotation to obtain flotation foam and in - trough product, and dry and weigh the products. The results of the beneficiation test are shown in Table 1 below.

[0024] Table 1 Flotation test indexes in Example 1

[0025]

[0026] Example 2

[0027] Grind 2 g of the mixed molybdenite and chalcopyrite materials to a particle size less than 74 μm, add 40 mL of water and 1 mL of hydrogen peroxide with a concentration of 4×10 -4 mol / L and stir for 5 min, conduct ultrasonic treatment for 3 min, adjust the pH of the obtained pulp to 7 with a pH adjuster, add 1 mL of collector kerosene with a concentration of 1 g / L and stir for 3 min, 1 mL of frother MIBC with a concentration of 4×10 -3 mol / L and stir for 1 min, then conduct air flotation to obtain flotation foam and in - trough product, and dry, weigh and assay the products. The results of the beneficiation test are shown in Table 2 below.

[0028] Table 2 Flotation test indexes (wt%) in Example 2

[0029]

[0030] The above are the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A method for separating molybdenite and chalcopyrite based on surface oxidation, characterized in that, It includes the following steps: S1: Grind the mixture of chalcopyrite and molybdenite, add the ground material into the flotation cell of the flotation machine with water, add hydrogen peroxide and stir for 5 min, and then treat the pulp with ultrasonic waves for 3 - 5 min; S2: Add a pH adjuster to the pulp after treatment in S1 to adjust the pH of the obtained pulp, then add a collector and stir for 3 - 5 min, and finally add a frother and stir for 1 min, and conduct air flotation to obtain flotation foam and in - cell product. The flotation foam is molybdenite, and the in - cell product is chalcopyrite; The dosage of hydrogen peroxide is 0.5×10 -5 -1.5×10 -5 mol / L; In S2, the pH of the pulp is adjusted to 7 - 9, and the pH adjuster used is hydrochloric acid or sodium hydroxide; in S1, the mixture raw material of chalcopyrite and molybdenite is ground to a particle size less than 74 μm; The hydrogen peroxide is prepared into a solution with a concentration of 4×10 -4 mol / L for addition.

2. The method for separating molybdenite and chalcopyrite based on surface oxidation according to claim 1, wherein, In S1, the mass ratio of the mixture raw material to water is 1:(30 - 50).

3. The method for separating molybdenite and chalcopyrite based on surface oxidation according to claim 1, characterized in that, In S2, the collector is kerosene with a dosage of 20 - 40 mg / L; the foaming agent is MIBC with a dosage of 0.5×10 -4 - 1×10 -4 mol / L.

4. The method for separating molybdenite and chalcopyrite based on surface oxidation according to claim 3, wherein, The kerosene is configured to be added as a solution with a concentration of 1 g / L, and MIBC is configured to be added as a solution with a concentration of 4×10 -3 mol / L.

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