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Method for leaching chalcopyrite

A chalcopyrite and leaching technology, applied in the field of hydrometallurgy, can solve the problems of low copper leaching rate and high temperature

Pending Publication Date: 2022-03-25
CHINESE ACAD OF GEOLOGICAL SCI
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Problems solved by technology

[0003] The most important process in the traditional hydrometallurgical treatment of chalcopyrite is the copper leaching process. The commonly used leaching agent is sulfuric acid, which reacts with sulfuric acid at a high temperature of 220-230 ° C to transform chalcopyrite into copper sulfate. Higher temperature required and lower copper leaching rate

Method used

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  • Method for leaching chalcopyrite

Examples

Experimental program
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Effect test

Embodiment 1

[0051] (1) Mix 5 g of chalcopyrite with 1 g of sodium carbonate (the mass ratio of sodium carbonate to chalcopyrite is 20:100), under the protection of nitrogen, smelt at 800° C. for 3 hours, and cool to room temperature to obtain pretreated chalcopyrite;

[0052](2) the pretreatment chalcopyrite that step (1) obtains and 25mL sulfuric acid solution (the concentration of sulfuric acid solution is 1.5mol / L, the quality of chalcopyrite and the volume ratio of sulfuric acid solution are 1g:5mL), 0.005g nitric acid Mix silver (the mass ratio of silver nitrate to chalcopyrite is 0.1:100), 12.5g ammonium persulfate (the mass ratio of ammonium persulfate to chalcopyrite is 2.5:1), and carry out oxidation leaching at 75°C and 500rpm 2h, cooled to room temperature, and filtered to obtain a copper-containing leaching solution.

[0053] The copper content in the copper-containing leaching solution and the chalcopyrite was tested, and the calculated copper leaching rate was 99.92%.

Embodiment 2

[0055] The smelting temperature in step (2) of Example 1 is replaced by 750° C., other parameters are the same as in Example 1, and the leaching rate of copper is 99.90%.

Embodiment 3

[0057] The oxidation leaching temperature in the step (1) of Example 1 was replaced by 80° C., other parameters were the same as in Example 1, and the leaching rate of copper was 99.95%.

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Abstract

The invention provides a chalcopyrite leaching method, which belongs to the technical field of hydrometallurgy, and comprises the following steps: (1) mixing chalcopyrite with alkali, and smelting to obtain pretreated chalcopyrite; and (2) the pretreated chalcopyrite obtained in the step (1) is mixed with an acid solution, a catalyst and an oxidizing agent for oxidation leaching, and copper-containing leachate is obtained. According to the method, firstly, the chalcopyrite is smelted with alkali, so that the lattice structure of the chalcopyrite is changed, copper is leached more easily, and the leaching temperature of subsequent leaching is reduced; a catalyst and an oxidizing agent are added in the acid leaching process, the leaching temperature is further reduced, the leaching time is shortened, and the leaching rate of copper is increased. The result of the embodiment shows that according to the leaching method, the leaching temperature is 75 DEG C, the leaching time is 2 h, and the leaching rate of copper reaches 99.9% or above.

Description

technical field [0001] The invention relates to the field of hydrometallurgy, in particular to a chalcopyrite leaching method. Background technique [0002] 70% of the copper on the earth exists in chalcopyrite. With the continuous increase in the development of copper resources, the mining grade of chalcopyrite resources continues to decline. The traditional pyrometallurgical technology for processing low-grade chalcopyrite not only has high production costs , and the gases such as sulfur dioxide released during the roasting process will seriously pollute the environment. Relatively speaking, hydrometallurgy technology has the advantages of low cost, large scale, high degree of resource utilization, good product quality, short construction period, and low environmental pollution. [0003] The most important process in the traditional hydrometallurgical treatment of chalcopyrite is the copper leaching process. The commonly used leaching agent is sulfuric acid, which reacts ...

Claims

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Application Information

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IPC IPC(8): C22B3/08C22B3/06C22B1/00C22B15/00
CPCC22B3/08C22B3/065C22B1/00C22B15/001C22B15/0071C22B15/0073Y02P10/20C22B1/02
Inventor 张垚垚张晓波金克谟刘凯刘军贺晓龙
Owner CHINESE ACAD OF GEOLOGICAL SCI
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