Method of recycling zinc by comprehensively utilizing steelmaking dust

Abstract

The invention discloses a method of recycling zinc by comprehensively utilizing steelmaking dust. The method comprises the following steps that steelmaking dust is mixed with a reducing agent and an additive and is pressed into pellets, the pellets are fed into a vacuum carbon tube furnace to carry out vacuum roasting to obtain gaseous elementary zinc volatile matter, the gaseous elementary zinc volatile matter passes through a condensation collector to be condensed to a solid, and the solid is obtained as a high-purity zinc ingot. The method promotes the reduction of zinc in steelmaking dustand recycles the steel-making dust, so that the high-quality zinc ingot is obtained, energy consumption during the control of vacuum condition in the steelmaking dust treatment process is reduced, theprocess is simple, the operation is simple and convenient, the vacuum reduction can effectively evaporate the zinc in the steelmaking dust, the purpose of condensing and collecting elementary zinc isachieved, the recovery rate of the zinc in the steelmaking dust is up to 97. 76%, the problem that in the prior art, the cost is high, the pollution is heavy, the energy consumption is high and threewastes are large when zinc-containing steel-making dust is treated are solved is effectively solved, and finally, the purpose of waste recycling is achieved.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of secondary resources, and in particular relates to a method for comprehensive utilization of steelmaking dust to recover zinc. Background technique [0002] Iron and steel enterprises will generate a lot of dust in various processes such as ironmaking, steelmaking and steel rolling, accounting for about 10% of the total steel output. It is one of the main pollution sources of iron and steel plants, and it is also a potential secondary resource. Due to the different levels of raw materials and fuels in various iron and steel enterprises, the dust contains not only high iron content, but also high zinc content. If it is directly returned to sintering as an ingredient, zinc will be continuously circulated and enriched, which will bring about blast furnace results. The bad influences such as tumor, upturned tuyere damage, etc. seriously endanger the smooth operation of the steel sm...

AI Technical Summary

Problems solved by technology

This application promotes the reduction of zinc in steelmaking dust through the addition of additives, realizes the recycling of steelmaking dust, obtains high-quality zinc ingots, and reduces the energy consumption when vacuum conditions are controlled during the steelmaking dust treatment process. And the process is simple, easy to operate, vacuum reduction can effectively evaporate the zinc in the steelmaking dust, achieve the purpose of condensation and collection of elemental zinc, make the recovery rate of zinc in the steelmaking dust as high as 97.76%, and effectively solve the problem of zinc in the steelmaking dust in the prior art. The problems of high cost, heavy pollution, high energy consumption, and large output of three wastes existed in the treatment of zinc steelmaking dust, and finally realized the purpose of waste recycling