Zinc-containing solid waste treatment method and system

Abstract

The invention relates to the technical field of non-ferrous metal metallurgy, in particular to a zinc-containing solid waste treatment method and system. The treatment method comprises the following steps that zinc-containing solid waste, a flux and a reducing agent are dried, the dried zinc-containing solid waste, the flux and the reducing agent are molten, so that first molten slag and first flue gas are obtained, the first slag is subjected to reduction smelting in a reducing atmosphere, so that second slag and zinc-containing flue gas, or metal alloy and zinc-containing flue gas, or sulfonium and zinc-containing flue gas is obtained, the zinc-containing flue gas is subjected to cooling or oxidation treatment, so that a zinc-containing product is obtained, and the zinc-containing product comprises any one of zinc powder, zinc liquid or zinc oxide. The zinc-containing solid waste treatment method is short in technological process, less in related matching, small in occupied area and low in investment cost, reduces the use of a reducing agent and fuel, and reduces carbon emission and environmental pollution.

Description

technical field [0001] The invention relates to the technical field of nonferrous metal smelting, in particular to a method and system for treating zinc-containing solid waste. Background technique [0002] At present, the zinc-containing solid waste produced by the non-ferrous smelting industry and the iron and steel industry, except for some solid waste with high value, can be used in collaboration with lead and copper industries. Most iron-vanadium slag, goethite slag, sulfur slag, lead-silver slag, etc. are disposed of in the form of stockpiling, but long-term stockpiling will pollute groundwater sources. [0003] In related technologies, most zinc-containing solid wastes are treated by wet treatment or pyrolysis. However, the process of wet treatment has a relatively long process, a large consumption of reagents, impurity chlorine affects production, and the recovery rate is not high. However, pyrolysis has problems such as high energy consumption, high labor intensity...

AI Technical Summary

Problems solved by technology

Most iron-vanadium slag, goethite slag, sulfur slag, lead-silver slag, etc. are disposed of in the form of stockpiling, but long-term stockpiling will pollute groundwater sources

[0003] In related technologies, most zinc-containing solid wastes are treated by wet treatment or pyrolysis. However, the process of wet treatment has relatively long process, large reagent consumption, impurity chlorine affects production, and low recovery rate.

However, pyroprocessing has problems such as high energy consumption, high labor intensity, low operation rate, large smoke volume, and large carbon emissions.

The volatilization kiln process not only needs to consume crushed coke, which is costly, but generally the kiln slag cannot be directly applied to other industries, and it needs to be stockpiled or further recovered carbon and iron

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