Copper slag resource treatment method in nickel refining system

Abstract

The invention provides a resourceful treatment method for copper slag of a nickel refining system. The method comprises the following steps that the copper slag is washed with water, and washing liquid is merged into the nickel refining system; Cu <2+> is added to the copper slag which is cleaned for the first time, then normal-pressure air leaching is carried out after a leaching solution is subjected to slurrying, wherein the leaching solution is obtained after pressurized oxygen leaching, and the leaching solution is merged into the nickel refining system; and leaching slag is added to a sulfuric acid solution, oxygen is introduced to carry out the pressurized oxygen leaching, the leaching slag is used as copper concentrate to return to a copper smelting system, and the leaching solution is returned to be subjected to the normal-pressure air leaching. According to the method, copper, nickel and cobalt in the copper slag can be effectively separated, and the resourceful and comprehensive recycling of the nickel, the copper and the cobalt can be realized, the principle is reliable, the process is short, the resource utilization rate is high, and the industrial production is easy to realize; and the method is especially suitable for the treatment of the copper slag of the nickel refining system.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal wet smelting, and in particular relates to a copper slag resource treatment method in a nickel refining system. Background technique [0002] At present, the nickel refining system generally adopts the traditional nickel sulfide soluble anode electrolysis process and sulfuric acid pressure leaching-insoluble anode electrodeposition nickel process. Among them, the nickel sulfide soluble anode electrolysis process has been developed continuously for many years. Optimization and improvement, stable economic and technical indicators, simple process operation control, stable and reliable product quality, has become a classic nickel wet refining process, and is the main nickel refining process. The nickel sulfide soluble anode electrolysis process adopts a three-stage continuous purification process for deep impurity removal: air oxidation neutralization for iron removal, nickel concentrate plu...

AI Technical Summary

Problems solved by technology

[0003] Although the copper slag of the nickel refining system is treated by the chlorine gas full immersion process, it has the advantages of high leaching rate and simple operation, but it also has the following defects: (1) The leaching slag is difficult to handle

Since the leaching slag contains a large amount of activated carbon, hot melting sulfur extraction cannot be carried out. Currently, incineration is used for treatment, and the incineration slag rich in precious metals cannot directly enter the alloy converter for treatment.

(2) The leaching solution needs to be electrolytically decoppered, and the processing cost is high

The copper in the leaching solution is removed by using the liquid-making decopper process, and the sponge copper powder with low quality is produced. Not only the power consumption is high, but also the copper powder obtained has a high impurity content, and the follow-up treatment cost is high.

(3) Precious metal dispersion loss

Due to the high potential used for the full immersion of copper slag, part of the precious metals in the copper slag are leached, resulting in the dispersion loss of precious metals in the raw materials

(4) The cost of chlorine-containing tail gas treatment is high

During the chlorine leaching process of copper slag, a large amount of chlorine-containing tail gas will be generated, which requires a large amount of liquid caustic soda to absorb, which increases the processing cost

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