Chalcopyrite combined inhibitor and application thereof

Abstract

The invention provides a chalcopyrite combined inhibitor and application thereof, and particularly relates to the technical field of copper sulfide molybdenum ore beneficiation. The combined inhibitor comprises penicillamine and trithiocyanuric acid, floating of the chalcopyrite is inhibited in the copper-molybdenum separation flotation process by adding the combined inhibitor, and therefore the floatability difference between molybdenite and the chalcopyrite is enlarged, and separation of the chalcopyrite and the molybdenite is achieved. According to the copper-molybdenum sulfide flotation separation combined inhibitor, the defects that a traditional copper-molybdenum flotation separation inhibitor is high in toxicity, harmful to the natural environment and the like are overcome, meanwhile, the remarkable flotation effect is achieved in separation flotation of copper-molybdenum sulfide ore, and the novel efficient combined inhibitor is provided for efficient utilization of copper-molybdenum ore resources.

Description

Technical Field

[0001] The invention relates to a chalcopyrite combined inhibitor and application thereof, belonging to the technical field of copper sulfide molybdenum ore beneficiation. Background Art

[0002] Chalcopyrite is a common copper-iron sulfide mineral found in nature and, in industry, serves as a primary raw material for copper smelting. Chalcopyrite naturally coexists closely with molybdenite. The physical and chemical similarities between the two surfaces make their separation challenging. Therefore, an inhibitor is required to effectively separate chalcopyrite and molybdenite. Notably, copper suppression and molybdenum flotation are a common process in actual production.

[0003] At present, the most common inhibitors in production are sodium sulfide, sodium hydrosulfide, and Knox reagent. These reagents have the following disadvantages: (1) the amount of reagents used is large and the unit price is high, which leads to high production costs; (2) if some reagents are not properly handled, they may produce harmful gases and pollute the environment; (3) some reagents are toxic and if they are not properly handled during the production process, they may cause harm to the health of workers at the production site and residents near the production plant.

[0004] Currently, industrial depressants used in the flotation separation of chalcopyrite and molybdenite generally face limitations. For these reasons, extensive research has been conducted to identify effective chalcopyrite depressants. The target depressant should be highly effective, less toxic, and economical, enabling efficient separation of chalcopyrite and molybdenite during mineral processing while minimizing any impact on worker health. Summary of the Invention

[0005] In order to solve the problems existing in the prior art, one of the objects of the present invention is to provide a chalcopyrite combination inhibitor, which includes penicillamine and thiocyanate; the mass ratio of penicillamine to thiocyanate is (1:2) to (2:1).

[0006] Another object of the present invention is to provide an application of a chalcopyrite combination depressant in the separation of chalcopyrite and molybdenite in the flotation of copper sulfide molybdenum ore, the specific process being: (1) The mixed concentrate of copper sulfide-molybdenum ore is ground to the required fineness, and then treated with activated carbon for drug removal. The pulp concentration and pH value are adjusted to the required value. A combined inhibitor and a collector are added to the pulp. After each agent is added, the mixture reacts for 5 minutes, and then scraped and foamed to obtain a roughing concentrate and a roughing tailing.

[0007] (2) The rougher concentrate obtained in step (1) is subjected to 7 rounds of beneficiation to obtain molybdenum concentrate. A certain amount of combined inhibitor is added each time the concentrate is made. The concentrated concentrate is molybdenum concentrate, and the tailings are returned to the previous operation each time the concentrate is made.

[0008] (3) The roughing tailings obtained in step (1) are scavenged twice to obtain copper concentrate. A certain amount of collector is added each time the scavenged tailings are scavenged, and the concentrate is returned to the previous operation each time.

[0009] Preferably, in step (1), the grinding fineness of -200 mesh accounts for more than 90%.

[0010] Preferably, the mass percentage concentration of the slurry in step (1) is 20% to 30%, and the pH value of the slurry is 4 to 8.

[0011] Preferably, the amount of the combined inhibitor added in step (1) is 600-800 g / t.

[0012] Preferably, the amount of the collector added in step (1) is 150-200 g / t, and the collector is kerosene.

[0013] Preferably, the addition amount of the combined inhibitor in the seven rounds of selection in step (2) is: 100~150g / t, 100~150g / t, 50~100g / t, 50~100g / t, 25~50g / t, 25~50g / t, and 10~25g / t.

[0014] Preferably, the amount of collector added in the two sweeps in step (3) is 40-50 g / t and 20-25 g / t, respectively.

[0015] Beneficial effects of the present invention: (1) The novel inhibitor provided by the present invention is a novel combined inhibitor that has a better inhibitory effect on chalcopyrite in the flotation operation of a mixed concentrate of chalcopyrite and molybdenite than conventional inhibitors. This is because under specific conditions of acidity and alkalinity, penicillamine and trithiocyanate molecules will selectively adsorb on the surface of chalcopyrite, undergo physical and chemical adsorption on its surface, and further form a covering layer of macromolecular organic matter, thereby inhibiting the adsorption of the collector on the surface of chalcopyrite, thereby enhancing the hydrophilicity of chalcopyrite, while molybdenite is still affected by the collector, and its hydrophobicity is enhanced and it is adsorbed on the surface of bubbles and floats up together with the bubbles; on the other hand, penicillamine can also play a certain degree of drug removal role. Therefore, when the combined inhibitor provided by the present invention is used to float copper sulfide molybdenum ore, it can not only effectively separate chalcopyrite and molybdenite, but also effectively improve the grade and recovery rate of molybdenite.

[0016] (2) The novel combination inhibitor provided by the present invention comprises penicillamine and trithiocyanate, has low toxicity and little harm to human health. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a flotation process flow chart of the present invention. DETAILED DESCRIPTION

[0018] The technical solutions provided by the present invention are described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0019] Example 1 The application of a chalcopyrite combination depressant in the flotation separation of chalcopyrite and molybdenite in the flotation of sulfide copper-molybdenum ore is as follows: (1) Slurry adjustment: First, grind the copper-molybdenum mixed concentrate to a fineness of , and then use activated carbon for de-doping treatment, and adjust the mass percentage concentration of the ore pulp to 30% and the pH to 4.

[0020] (2) Roughing: add 600 g / t of combined inhibitor (the mass ratio of penicillamine and trithiocyanate in the combined inhibitor is 1.5:1) to the slurry prepared in step (1), stir for 5 minutes, and then add 200 g / t of collector kerosene to perform roughing separation operation to obtain roughing concentrate and roughing tailings.

[0021] (3) Seven-time selection: The rougher concentrate obtained in step (2) is selected seven times, and 100 g / t, 100 g / t, 50 g / t, 50 g / t, 25 g / t, 25 g / t, and 10 g / t of a combined inhibitor (the mass ratio of penicillamine to trithiocyanate in the combined inhibitor is 1.5:1) is added in each selection. The tailings obtained in each selection are returned to the previous operation in sequence, and the final concentrate after seven selections is a molybdenum concentrate.

[0022] (4) Two scavenging: The roughing tailings obtained in step (2) are scavenged twice, and 50 g / t and 25 g / t of kerosene as a collector are added during each scavenging, respectively. The concentrate obtained from each scavenging is returned to the previous operation in sequence, and the final tailings from the scavenging are copper concentrates.

[0023] The yield and grade of the experimental results were tested, and the results are shown in Table 1.

[0024] Table 1 Experimental results of Example 1 This process ultimately yielded a molybdenum concentrate with a molybdenum grade of 46.68% and a molybdenum recovery rate of 82.16%, and a copper concentrate with a copper grade of 19.97% and a copper recovery rate of 99.97%, meeting the technical requirements for subsequent copper and molybdenum concentrate production.

[0025] Example 2 The raw ore in this implementation case is a mixed concentrate of copper and molybdenum sulfide produced by a porphyry copper mine in Inner Mongolia. The copper content in the raw ore is 27.62wt% and the molybdenum content is 2.96wt%. The main gangue is quartz, dolomite, etc. The process flow chart is as follows Figure 1 As shown, the experiment is carried out in the following steps: (1) Conditioning: Firstly, the copper-molybdenum mixed concentrate is ground to a fineness of 74 μm, and then the activated carbon is used to remove the reagent to adjust the mass percentage concentration of the ore slurry to 20% and the pH to 8.

[0026] (2) Roughing: The combined depressant 800 g / t (the mass ratio of penicillamine to trithiocyanic acid in the combined depressant is 2:1) is added to the ore slurry conditioned in step (1) and stirred for 5 min, and then the collector kerosene 1500 g / t is added for roughing separation to obtain the roughing concentrate and the roughing tailings.

[0027] (3) Seven times of cleaning: The roughing concentrate obtained in step (2) is cleaned seven times, and the combined depressant (the mass ratio of penicillamine to trithiocyanic acid in the combined depressant is 2:1) 150 g / t, 150 g / t, 100 g / t, 100 g / t, 50 g / t, 50 g / t and 25 g / t is added to each cleaning, respectively, and the tailings obtained in each cleaning is returned to the previous operation in sequence, and the final concentrate of the seven times of cleaning is the molybdenum concentrate.

[0028] (4) Two times of scavenging: The roughing tailings obtained in step (2) are scavenged two times, and the collector kerosene 40 g / t and 20 g / t is added to each scavenging, respectively, and the concentrate obtained in each scavenging is returned to the previous operation in sequence, and the final tailings of the scavenging is the copper concentrate.

[0029] The yield and grade of the experimental results are detected, and the results are shown in Table 2.

[0030] Table 2 Experimental results of Example 2 The molybdenum concentrate with a molybdenum grade of 44.63% and a molybdenum recovery rate of 90.47% and the copper concentrate with a copper grade of 29.32% and a copper recovery rate of 99.79% are obtained by using the process, which meets the production technical requirements of the copper and molybdenum concentrates in subsequent production.

[0031] Comparative Example 1 As a comparative example, the comparative example is different from the example only in that the used depressant contains only penicillamine, the dosage of penicillamine in roughing is 575 g / t, and the dosage of the depressant in cleaning and scavenging and the flotation steps are the same as those of Example 2, and the final experimental results are shown in Table 3.

[0032] Table 3 Experimental results of Comparative Example 1 Comparative Example 2 As a comparative example, the comparative example is different from the example only in that the used depressant contains only trithiocyanic acid, the dosage of trithiocyanic acid in roughing is 575 g / t, and the dosage of the depressant in cleaning and scavenging and the flotation steps are the same as those of Example 2, and the final experimental results are shown in Table 4.

[0033] Table 4 Experimental results of Comparative Example 2 From the flotation results of the examples and comparative examples, it can be seen that when the combination inhibitor provided by the present application is used for flotation of copper-molybdenum sulfide ore, the grade and recovery of molybdenite can be effectively improved.

Claims

1. A chalcopyrite combination inhibitor, characterized by: The combined inhibitor comprises penicillamine and thiocyanate; the mass ratio of penicillamine to thiocyanate is (1:2) to (2:1).

2. Use of the chalcopyrite combination depressant according to claim 1 in the separation of chalcopyrite and molybdenite in the flotation of copper sulfide molybdenum ore.

3. The use according to claim 2, characterized in that: The specific process is: (1) The mixed concentrate of copper sulfide-molybdenum ore is ground to the required fineness, and then treated with activated carbon for drug removal. The pulp concentration and pH value are adjusted to the required value. A combined inhibitor and a collector are added to the pulp. After each agent is added, the mixture reacts for 5 minutes, and then scraped and foamed to obtain a roughing concentrate and roughing tailings. (2) The rougher concentrate obtained in step (1) is subjected to 7 rounds of beneficiation to obtain molybdenum concentrate, and a certain amount of combined inhibitor is added each time the beneficiation is performed. The beneficiated concentrate is molybdenum concentrate, and the tailings of each beneficiation are returned to the previous operation; (3) The roughing tailings obtained in step (1) are scavenged twice to obtain copper concentrate. A certain amount of collector is added each time the scavenged tailings are scavenged, and the concentrate is returned to the previous operation each time.

4. The use according to claim 3, characterized in that: In step (1), the grinding fineness of -200 mesh accounts for more than 90%.

5. The use according to claim 3, characterized in that: In step (1), the mass percentage concentration of the ore pulp is 20% to 30%, and the pH value of the ore pulp is 4 to 8.

6. The use according to claim 3, characterized in that: The amount of combined inhibitor added in step (1) is 600-800 g / t.

7. The use according to claim 3, characterized in that: The amount of collector added in step (1) is 150-200 g / t, and the collector is kerosene.

8. The use according to claim 3, characterized in that: The addition amounts of the combined inhibitor in the seven rounds of selection in step (2) are: 100~150g / t, 100~150g / t, 50~100g / t, 50~100g / t, 25~50g / t, 25~50g / t, and 10~25g / t.

9. The use according to claim 3, characterized in that: The amounts of collector added in the two sweeps in step (3) are 40-50 g / t and 20-25 g / t, respectively.

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