Copper-molybdenum flotation separation method for copper-molybdenum bulk concentrate

Abstract

The invention discloses a copper-molybdenum bulk concentrate copper-molybdenum flotation separation method which comprises the steps of pretreatment, roughing, concentration and scavenging and specifically comprises the steps that to-be-treated copper-molybdenum bulk concentrate is subjected to size mixing till the concentration is 20-35%, and a material a is obtained; sodium sulfide is added into the material a and stirred for 5-10 min, dehydration and reagent removal are conducted in a thickening mode, thick underflow b and return water are obtained, and the return water is circulated; the ore pulp concentration of the dense underflow b is adjusted to be 15-30%, a copper inhibiting and molybdenum floating combined agent and kerosene are sequentially added for flotation, and molybdenum rough concentrate c and copper rough concentrate d are obtained; the molybdenum rough concentrate c is subjected to four-stage concentration to obtain molybdenum concentrate, and tailings subjected to concentration in the period return to the previous step for circulation; and adding a copper inhibiting and molybdenum floating combination agent and kerosene into the copper rough concentrate for secondary scavenging to obtain copper concentrate, and returning scavenged tailings to the previous step for circulation in the period.

Description

Technical Field

[0001] The invention belongs to the technical field of comprehensive utilization of mines, and in particular relates to a method for flotation separation of copper and molybdenum from a copper-molybdenum mixed concentrate. Background Art

[0002] The Tongkuangyu Mine is a mixed copper-molybdenum concentrate with a molybdenum content between 0.1% and 0.4%. In order to achieve the copper-molybdenum separation in the Tongkuangyu Mine Concentrator, comprehensively recover the valuable metal molybdenum, and improve the added economic benefits of mine products, we carry out research on copper-molybdenum separation technology, research and develop the best flotation process and reagent system for copper-molybdenum separation, and evaluate the comprehensive utilization efficiency of resources. Summary of the invention

[0003] The object of the present invention is to provide a method for flotation separation of copper and molybdenum from a copper-molybdenum mixed concentrate.

[0004] The object of the present invention is achieved in that the copper-molybdenum mixed concentrate copper-molybdenum flotation separation method comprises pre-treatment, roughing, cleaning and scavenging steps, specifically comprising: A. Pre-treatment: 1) slurrying the copper-molybdenum mixed concentrate to be processed to a concentration of 20-35% to obtain material a; 2) Add sodium sulfide to material a and stir for 5-10 minutes, dehydrate and remove the drug by thickening to obtain dense underflow b and return water, and circulate the return water; B. Roughing: Adjust the pulp concentration of the dense underflow b to 15-30%, add copper-suppressing molybdenum flotation combination agent and kerosene in sequence for flotation to obtain molybdenum rough concentrate c and copper rough concentrate d; C. Concentration: The molybdenum rough concentrate c is subjected to four-stage concentration to obtain molybdenum concentrate, during which the concentrated tailings are returned to the previous step for circulation; D. Scavenging: Add copper-floating molybdenum combination agent and kerosene to the copper rough concentrate for secondary scavenging to obtain copper concentrate, during which the scavenging tailings are returned to the previous step for circulation; The copper-floating molybdenum suppressing composite agent is composed of sodium sulfide and D117. The D117 is a mixture of sodium dithiophosphate, sodium monothiophosphate and sodium sulfide. It is produced by the reaction of sodium hydroxide (concentration 20-40%) and phosphorus pentasulfide (concentration 20-40%) under normal pressure. The reaction is an exothermic reaction. The molar ratio of sodium hydroxide to phosphorus pentasulfide is 5:1 to 10:1.

[0005] The copper-molybdenum separation process of the present invention, which adopts sodium sulfide de-drug-sodium sulfide + D117 combination to suppress copper floating molybdenum, is reliable and stable, has a simple reagent system, controllable reagent cost, good process adaptability, and has advantages in comprehensive recovery of low-grade molybdenum.

[0006] The conventional process method is: dense dehydration and drug removal of copper-molybdenum mixed concentrate - adding copper mineral inhibitors to inhibit copper mineral flotation and molybdenum minerals - regrinding the coarse concentrate and then concentrating in multiple stages to obtain the final molybdenum concentrate. The process method of the present invention is: adding a drug removal agent to the copper-molybdenum mixed concentrate slurry and stirring - dense dehydration and drug removal - adding copper mineral inhibitors to inhibit copper flotation and molybdenum - regrinding the coarse concentrate and then concentrating in multiple stages to obtain the final molybdenum concentrate. The process of the present invention can enhance the drug removal effect of the copper-molybdenum mixed concentrate, enhance the copper-molybdenum separation effect, and reduce the total dosage of the reagent. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a schematic diagram of the process flow of the present invention; Figure 2 This is a schematic diagram of the conventional process flow. DETAILED DESCRIPTION

[0008] The present invention is further described below in conjunction with the embodiments, but the present invention is not limited in any way. Any changes or substitutions made based on the teachings of the present invention belong to the protection scope of the present invention.

[0009] The copper-molybdenum mixed concentrate flotation separation method of the present invention comprises pre-treatment, roughing, cleaning and scavenging steps, specifically comprising: A. Pre-treatment: 1) slurrying the copper-molybdenum mixed concentrate to be processed to a concentration of 20-35% to obtain material a; 2) Add sodium sulfide to material a and stir for 5-10 minutes, dehydrate and remove the drug by thickening to obtain dense underflow b and return water, and circulate the return water; B. Roughing: Adjust the pulp concentration of the dense underflow b to 15-30%, add copper-suppressing molybdenum flotation combination agent and kerosene in sequence for flotation to obtain molybdenum rough concentrate c and copper rough concentrate d; C. Concentration: The molybdenum rough concentrate c is subjected to four-stage concentration to obtain molybdenum concentrate, during which the concentrated tailings are returned to the previous step for circulation; D. Scavenging: Add copper-floating molybdenum combination agent and kerosene to the copper rough concentrate for secondary scavenging to obtain copper concentrate, during which the scavenging tailings are returned to the previous step for circulation; The copper-floating molybdenum suppressing composite agent is composed of sodium sulfide and D117. The D117 is a mixture of sodium dithiophosphate, sodium monothiophosphate and sodium sulfide. It is produced by the reaction of sodium hydroxide (concentration 20-40%) and phosphorus pentasulfide (concentration 20-40%) under normal pressure. The reaction is an exothermic reaction. The molar ratio of sodium hydroxide to phosphorus pentasulfide is 5:1 to 10:1.

[0010] The mass ratio of the sodium sulfide to D117 is (1-10):1.

[0011] The present invention is further described below with specific implementation cases: Example 1 The copper-molybdenum mixed concentrate has a copper grade of 23.5% and a molybdenum grade of 0.30%. The copper-molybdenum mixed concentrate is subjected to a method for separating the copper mineral from the molybdenum mineral by suppressing the flotation of the copper mineral. The separation process adopts the process flow of the patent application, see Figure 1 The separation results are shown in Table 1. The molybdenum concentrate has a molybdenum grade of 45.17% and a molybdenum recovery rate of 65.44%. The copper concentrate has a copper grade of 23.65% and a copper recovery rate of 99.98%. In the process, sodium sulfide is a desulfurization agent and also a copper mineral inhibitor, with a total dosage of 4.2 kg.

[0012] Table 1 Copper and molybdenum separation results / %

[0013] Comparative Example 1 The process flow of the conventional method is shown in Figure 2 The separation results are shown in Table 2. The molybdenum grade of the molybdenum concentrate is only 39.77%, the molybdenum recovery rate is 73.08%, the copper grade of the copper concentrate is 23.55%, and the copper recovery rate is 99.95%. The total amount of sodium sulfide used in the process is 5.2kg.

[0014] Table 2 Copper and molybdenum separation results of conventional methods / %

[0015] Example 2 Experimental Study on Flotation Separation of Copper and Molybdenum There are two methods for copper-molybdenum separation and flotation: one is to suppress copper and float molybdenum, and the other is to suppress molybdenum and float copper. At present, most manufacturers at home and abroad choose the first method. The experimental research of the present invention mainly adopts the method of suppressing copper and floating molybdenum to carry out the copper-molybdenum separation and flotation experimental research, and the main research contents are as follows: Conduct research on the dosage system of conventional sodium sulfide inhibitors, new copper-molybdenum separation inhibitors, and the combination of sodium sulfide + new agents; conduct research on the effect of collector diesel on copper-molybdenum separation; conduct research on the dosage system of impurity inhibitors to explore the influence of impurity minerals such as gangue on the indicators of copper-molybdenum separation.

[0016] The technical indicators of copper-molybdenum separation of the copper-molybdenum mixed concentrate after stirring and dedoping did not meet the contract requirements. Therefore, a copper-molybdenum separation test with sodium sulfide dedoping was carried out to examine the effect of sodium sulfide dedoping on copper-molybdenum separation. The principle process plan of sodium sulfide stirring dedoping-D117 synergistic suppression of copper and molybdenum floating was used to carry out conditional tests and small-scale closed-circuit tests.

[0017] 1. Test on dosage of sodium sulfide for drug removal After the copper-molybdenum mixed concentrate was stirred with sodium sulfide for 5 minutes, the supernatant was pumped away, and the concentrated slurry entered the copper-molybdenum separation process. The amount of D117 for separation and roughing copper inhibitor was 2000g / t, diesel was 20g / t, and the roughing concentration was 18%. The dosage of sodium sulfide for de-drugation was tested. The test results are shown in Table 3: Table 3 De-drug sodium sulfide dosage test results / %

[0018] The test results show that with the increase of sodium sulfide dosage, the grade of molybdenum concentrate gradually increases and the molybdenum recovery rate gradually decreases. Taking comprehensive considerations, the dosage of sodium sulfide for dedoping is 5kg / t in this test.

[0019] 2. Single sodium sulfide dosage test After sodium sulfide removal, a single sodium sulfide dosage test was conducted for roughing, diesel 20g / t, roughing concentration 18%, the test results are shown in Table 4: Table 4 Single sodium sulfide dosage test results / %

[0020] The test results show that after sodium sulfide dedoping, the use of single sodium sulfide for copper-molybdenum separation with copper suppression and molybdenum floating can reduce the amount of sodium sulfide under similar molybdenum concentrate indicators, indicating that the effect of sodium sulfide dedoping is better than that of stirring dedoping. With the increase of sodium sulfide dosage, the Mo grade of the coarse concentrate gradually increases, and the molybdenum recovery rate tends to be stable.

[0021] 3. Single D117 dosage test After sodium sulfide removal, a single D117 dosage test was conducted, with a diesel dosage of 20g / t and a roughing concentration of 18%. The test results are shown in Table 5: Table 5 D117 dosage test results / %

[0022] The test results show that after sodium sulfide dedoping, the single D117 is used for copper-molybdenum separation with copper suppression and molybdenum floating. Under similar molybdenum concentrate indicators, the dosage of D117 is reduced, indicating that the use of sodium sulfide dedoping can reduce the subsequent dosage of inhibitors. With the increase of D117 dosage, the molybdenum grade of the rough concentrate gradually increases, and the Mo recovery rate gradually decreases. Considering the grade and recovery rate comprehensively, 2000g / t of D117 was selected in this test.

Claims

1. A method for flotation separation of copper and molybdenum from a copper-molybdenum mixed concentrate, characterized in that: The copper-molybdenum mixed concentrate copper-molybdenum flotation separation method comprises pre-treatment, roughing, cleaning and scavenging steps, specifically comprising: A. Pre-treatment: 1) slurrying the copper-molybdenum mixed concentrate to be processed to a concentration of 20-35% to obtain material a; 2) Add sodium sulfide to material a and stir for 5-10 minutes, and dehydrate and remove the drug by thickening to obtain dense underflow b and return water, which can enter the total return water circulation treatment system of copper-molybdenum ore dressing; B. Roughing: Adjust the pulp concentration of the dense underflow b to 15-30%, add copper-suppressing molybdenum flotation combination agent and kerosene in sequence for flotation to obtain molybdenum rough concentrate c and copper rough concentrate d; C. Concentration: The molybdenum rough concentrate c is subjected to four-stage concentration to obtain molybdenum concentrate, during which the concentrated tailings are returned to the previous step for circulation; D. Scavenging: Add copper-floating molybdenum combination agent and kerosene to the copper rough concentrate for secondary scavenging to obtain copper concentrate, during which the scavenged concentrate is returned to the previous step for circulation; The copper-floating molybdenum suppressing composite agent is composed of sodium sulfide and D117, wherein the D117 is a mixture of sodium dithiophosphate, sodium monothiophosphate and sodium sulfide.

2. The copper-molybdenum mixed concentrate flotation separation method according to claim 1, characterized in that: The mass ratio of the sodium sulfide to D117 is (1-10):

1.

3. The copper-molybdenum mixed concentrate flotation separation method according to claim 1, characterized in that: The D117 is produced by the reaction of sodium hydroxide and phosphorus pentasulfide under normal pressure.

4. The copper-molybdenum mixed concentrate flotation separation method according to claim 3 is characterized in that: The molar ratio of the sodium hydroxide to phosphorus pentasulfide is 5:1 to 10:

1.

5. The method for flotation separation of copper and molybdenum from a mixed concentrate of copper and molybdenum according to claim 3 or 4, characterized in that: The mass percentage concentration of the sodium hydroxide is 20-40%.

6. The method for flotation separation of copper and molybdenum from a mixed copper and molybdenum concentrate according to claim 3 or 4, characterized in that: The mass percentage concentration of the phosphorus pentasulfide is 20-40%.

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