Method for processing high-copper-silver smelting slag

Abstract

The invention discloses a method for processing high-copper-silver smelting slag. The method comprises the following steps: (1) smashing molten high-copper-silver smelting slag by virtue of high-pressure liquid or high-pressure gas; (2) adding the crushed high-copper-silver smelting slag, sulfuric acid and iron sulfate into a high-pressure reaction kettle, wherein the liquid-solid ratio is (8-10) to 1: introducing oxygen into the high-pressure reaction kettle; reacting for 3-5 hours under the pressure intensity of 1.0-0.3MPa at a reaction temperature of 140-180 DEG C; and after the reaction is finished, filtering the mixture, so as to obtain leachate and leaching residue; (3) adding iron powder into the leachate and reacting for 1-2 hours, wherein the weight of the iron powder is 1.1-1.3 times that of copper; and after the reaction is finished, filtering the mixture, so as to obtain sponge copper and filtrate; and (4) adding sodium sulfide into the filtrate obtained in the step (3) to regulate the pH to 8-9, carrying out filtering separation to obtain sulfide precipitate and filtrate, and carrying out triple crystallization on the filtrate, so as to generate sodium sulfate crystals. According to the method provided by the invention, copper in the high-copper-silver smelting slag can be effectively recycled, and silver can be enriched and the leaching of arsenic can be inhibited.

Description

technical field [0001] The invention relates to the field of nonferrous metal hydrometallurgy, in particular to a method for processing high-copper-silver smelting slag. Background technique [0002] At present, domestic and foreign smelting slag treatment is dominated by the traditional pyrometallurgy process, which faces challenges due to many problems such as poor operating environment, serious pollution, long production cycle, and lack of comprehensive utilization of valuable metals. Especially for the silver-containing copper smelting slag, if it is directly treated by fire method, the direct recovery rate of silver will be very low, often less than 50%. Moreover, for small and medium-sized enterprises, the pyrotechnic process requires large investment, low equipment utilization rate, and difficult to solve lead damage. In addition, due to the large-scale use of high-arsenic ores, the content of arsenic in many smelting systems is getting higher and higher. Since arsen...

AI Technical Summary

Problems solved by technology

[0002] At present, the domestic and foreign smelting slag treatment is mainly based on the traditional pyrometallurgy process, which is facing challenges due to many problems such as poor operating environment, serious pollution, long production cycle, and lack of comprehensive utilization of valuable metals.

Especially for silver-containing copper smelting slag, if it is directly treated by fire method, the direct recovery rate of silver will be very low, often less than 50%.

Moreover, for small and medium-sized enterprises, the pyrotechnic process requires large investment, low utilization rate of equipment, and difficult to solve lead damage.

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