Comprehensive recovery process of low-grade matte slag metal resources

Abstract

The invention discloses a comprehensive recovery process of low-grade matte slag metal resources. The process comprises the following steps: 1) matte slag performs the crushing and the wet ball milling to reach 100% of particle sizes less than 0.074 mm, and is magnetically separated by a permanent magnetic separator; and magnetically separated tailing is dehydrated for metal leaching and extraction; 2) the magnetically separated tailing performs the oxide leaching to comprehensively leach and extract valuable metal; leaching liquid is extracted to recover Cu; and strip liquor passes through electrodeposition cathode copper plate; 3) copper raffinate removes iron by using a goethite method; after Fe is removed, supernatant is extracted to recover Zn, and the strip liquor is concentrated and crystallized to prepare zinc sulfate; the obtained raffinate is extracted to recover manganese; and the strip liquor is concentrated and crystallized to prepare manganese sulfate; 4) after the raffinate is absorbed by activated carbon to reduce COD, heavy metal is treated by sulfide precipitation; and 5) after leaching slag performs the alkali washing, elemental sulfur and a lead-silver sulfide ore are recovered by flotation. The process solves the difficulty of incomplete recycling of low-grade matte slag, realizes comprehensive recovery of low-grade matte slag resources, and is higher in environmental benefit and economic benefit.

Description

technical field [0001] The invention relates to a comprehensive recovery process of low-grade matte slag metal resources, which belongs to the field of solid waste resource recovery. Background technique [0002] Matte slag is a by-product produced in the process of pyro-recovery of lead secondary resources, which contains valuable metals such as iron, lead, zinc, copper, and silver. 30%-50% of the iron in the matte slag exists in the form of elemental iron, and the rest of the iron exists in the form of FeS. The composition of matte slag is roughly as follows: Cu2-5%, Pb3-10%, Zn3-10%, Ag0.01-0.06%, Fe35-60%, S10-20%, most of the matte slag contains a certain amount As. [0003] As a dangerous solid waste, matte slag contains relatively low content of valuable metals and sulfur, and also contains a certain amount of As. If it is treated by conventional pyrometallurgical methods, it will waste resources and cannot avoid the formation of secondary pollution. . If wet trea...

AI Technical Summary

Problems solved by technology

[0003] As a dangerous solid waste, matte slag contains relatively low content of valuable metals and sulfur, and also contains a certain amount of As. If it is treated by conventional pyrometallurgical methods, it will waste resources and cannot avoid the formation of secondary pollution.

If wet treatment is used, because the iron content is too high, the cost of iron removal in the smelting process remains high, and it is difficult to realize in industrial production

At present, matte slag is used as ballast stone in shipyards or raw materials in cement plants, and there is no effective recovery and treatment process for harmless resources.

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