Sulfurizing reduction and roasting and voltizing dearsenication method for copper-zine-cobalt material

Abstract

The present invention relates to the dearsenication method of Cu-Zn-Co mineral in non-ferrous metal smelting developed for dearsenication at high efficiency. The present invention features that Cu-Zn-Co mineral in 36-58 wt%, chalocotie as sulfurizing agent in 36-58 wt% and carbon material as reductant in 4-8 wt% are crushed, mixed and pelletized before reducing roasted at 700-900 deg.c. The present invention has the advantages of reasonable technological process, less pollution and high dearsenication rate.

Description

technical field [0001] The invention relates to the technical field of mineral pretreatment in non-ferrous metal smelting, in particular to the technical field of arsenic removal from copper ore smelting materials. Background technique [0002] Cobalt recovery from traditional copper-cobalt ore or cobalt-containing nickel ore is obtained by sulfuration reduction smelting of cobalt in converter slag. Due to the dispersion of cobalt in the process, part of the cobalt is lost in the smelting slag. At the same time, a large amount of quartz flux is added to the converter blowing process. The enrichment factor of cobalt in converter slag is low, that is to say, the traditional method has problems such as low cobalt recovery rate, low cobalt grade in cobalt-rich slag, and high cost for further processing. For this reason, the present inventors have invented a new fire smelting method, which uses metallurgical coke or other reducing agents to smelt in a special blast furnace or ele...

AI Technical Summary

Problems solved by technology

The process method has the characteristics of simple process, thorough separation, good comprehensive recovery of valuable metals in materials, high metal recovery rate, low recovery cost, and good economic benefits. It opens up a new way for the effective treatment of complex copper, zinc and cobalt materials. However, its process has strict requirements on the impurities such as arsenic, antimony, lead, tin, bismuth in the materials, especially the arsenic content. Most of the materials can meet this requirement, and can be directly added to the furnace for processing. smelting, however, there are quite a few such materials that contain more of the above-mentioned impurities and must be pre-treated before they can be loaded into the furnace for smelting

[0003] The traditional sulfide roasting method is to add a large amount of pyrite or arsenic sulfide ore to the material and roast together to make the arsenic volatilize in the form of arsenic sulfide. The increasingly stringent environmental protection requirements are not suitable, especially for some materials with high arsenic content. Since arsenic and copper coexist, and the material contains low sulfur and high copper content, the copper oxide separated from copper arsenate is easily reduced to metallic copper. Then the reduced arsenic is extremely easy to combine with copper to form a non-volatile copper-arsenic alloy phase, which makes the traditional redox roasting unable to remove arsenic well.