Smelting method for treating zinc leached residues in mixed manner by using oxygen leached residues

Abstract

The invention belongs to the technical field of smelting of zinc, in particular to a smelting method for treating zinc leached residues in a mixed manner by using oxygen leached residues, which comprises the following steps of: generating underflow after directly leaching zinc sulphide concentrate, directly filtering the underflow without carrying out floatation of the underflow to obtain oxygen leached residues with high sulphur content and low zinc content; mixing the oxygen leached residues with the zinc leached residues to obtain a mixed material; and smelting the mixed material by adopting two sections of oxygen-enriched smelting pools to obtain smoke and smelted residue, the sulphur content of which is less than 1% and the zinc content of which is less than 1%, recycling afterheat in smoke and collecting dust to obtain zinc oxide smoke fed into a zinc system, and carrying out acid treatment of smoke, the dust of which is collected. According to the invention, oxygen pressure leached underflow is directly filtered to obtain the oxygen leached residues with high sulphur content and low zinc content; the zinc leached residues are treated in a mixed manner by using the oxygen leached residues; the property for treating materials is changed; coke or coal as a reducing agent is replaced by sulphur in the oxygen leached residues; a lot of fuel is saved; the environment is improved; and the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of zinc smelting, and in particular relates to a smelting method for mixing zinc leaching slag with oxygen leaching slag. Background technique [0002] A large amount of zinc leaching slag is produced in the process of wet zinc smelting, which mainly includes medium leaching slag, high leaching slag, and iron slag (jarosite slag, goethite slag and hematite slag). The general wet zinc smelting method produces medium leaching slag; the high temperature and high acid method produces two kinds of slag, one is high leaching slag, and the other is iron slag produced during the iron removal process; iron slag is produced according to different iron removal processes. Three types of jarosite slag, goethite slag and hematite slag are produced. [0003] The leaching slag produced by the conventional method has a high zinc content, so it must be treated by pyrolysis to recover zinc, and the leaching slag is sold outsi...

AI Technical Summary

Problems solved by technology

[0007] Combined with zinc sulfide concentrate leaching treatment technology, the present invention provides a smelting method for mixing zinc leaching slag with oxygen leaching slag to overcome the traditional volatilization method with high energy consumption, poor environment and low concentration of SO 2 The flue gas needs to be treated, and the production cost is high

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