Environment-friendly and high-efficiency production method of antimony white by using Sb and As-containing ash

Abstract

The invention relates to an environment-friendly and high-efficiency production method of antimony white by using Sb and As-containing ash, belonging to the fields of nonferrous metallurgy and chemical industry. The production method comprises the following steps: putting Sb and As-containing ash into a high-pressure reactor, adding sodium hydroxide and sodium carbonate and performing high-pressure alkaline oxygen bleaching; reacting leachate with copper sulfate to generate a copper arsenate product and preparing sodium sulfate by using waste liquid; burdening leaching residue and reducing coal and adding to an internal smelter for reduction smelting to generate lead-antimony alloy; and burdening the produced lead-antimony alloy in an oxidizing kettle and performing oxidizing blowing to obtain antimony white with purity of 99.5% or above, wherein reduction residue obtained through reduction smelting returns to a lead system to be subjected to burdening and bottom lead obtained through oxidizing blowing also returns to the lead system to be subjected to burdening. The production method has the beneficial effects that As comes into leachate and Sb comes into leaching residue so that As and Sb in the Sb and As-containing ash can be effectively separated; moreover, the Sb and As-containing ash can be converted into high-purity antimony white, harm of As in the Sb and As-containing ash can be eliminated and As can be converted into a valuable copper arsenate product; latent heat in the production process is used sufficiently. The production method has the advantages of high raw material adaptability, large handling capacity, high energy efficiency and the like; moreover, environment pollution is avoided and green production is realized.

Description

technical field [0001] The invention relates to a method for producing antimony white with antimony-arsenic soot green and high efficiency, belonging to the field of non-ferrous metallurgy and chemical industry. Background technique [0002] Antimony and arsenic soot is a mixture collected by dust collectors during the early stages of lead anode slime reduction smelting and oxidation blowing. It generally contains 50-75% antimony, 10-25% arsenic, and 1-5% lead. The content of other elements (silver, copper, bismuth, iron, etc.) is less than 1%. At present, there are generally two methods for smelters to deal with antimony and arsenic soot. One is to sell it directly as a finished product. Due to the high content of arsenic, its price is relatively low, and the price of its metal content is only 60% of the price of pure antimony metal. . The second is to produce refined antimony white through the fire method of "reduction smelting-adding alkali to remove arsenic-oxidative b...

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