Method for dezincification of zinc-containing dust through hydrogen reduction

Abstract

The invention discloses a zinc-containing dust hydrogen reduction dezincification method which comprises the following steps: S1, adding water into a zinc-containing dust material for wetting, stacking after wetting, covering, heating and curing to obtain a cured material; s2, a binder is added into the cured material, strong uniform mixing treatment is conducted, then high-pressure roller grinding and wet grinding combined treatment is conducted, and a uniformly mixed material is obtained; s3, pelletizing the uniformly mixed material, and then drying green pellets to obtain dry pellets; and S4, the dry balls are loaded into a gas-based shaft furnace for hydrogen reduction, the reduction temperature ranges from 800 DEG C to 950 DEG C, cooling is conducted under the protective atmosphere after reduction, and the reduced dezincified balls are obtained. According to the method, the advantages of low hydrogen reduction temperature, high reduction rate, low energy consumption, high efficiency and no carbon emission are utilized, the zinc-containing dust pellets are reduced, so that many problems existing in traditional carbon thermal reduction are solved, the reduction effect can be improved, the comprehensive utilization effect of the zinc-containing dust can be improved, and environmental protection is facilitated.

Description

A kind of method of zinc-containing dust hydrogen reduction dezincification technical field The invention belongs to the technical field of iron and steel metallurgy, be specifically related to a kind of method of zinc-containing dust hydrogen reduction dezincification. Background technique Iron and steel industry is an important basic industry of my country's economic development, and it is also a large solid waste discharger. In its smelting process A wide variety of difficult-to-handle dusts, such as zinc-containing dusts, are generated. According to statistics, the total amount of dust generated by iron and steel enterprises is generally 8% to 12% of the output, while zinc-containing dust accounts for 20% to 30%. Based on this calculation, the annual emission of zinc-containing dust from iron and steel plants in my country more than 20 million tons. Zinc-containing dust is rich in a variety of heavy metals and is a typical hazardous waste. If it cannot be effect...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of high energy consumption, high pollution, large carbon emissions and low product quality in the traditional carbothermal reduction method for zinc-containing dust, the purpose of this invention is to propose a method for hydrogen reduction and dezincification of zinc-containing dust, in order to Cleaner and more efficient dezincification and comprehensive utilization of zinc-containing dust

Images