A method for producing antimony white by removing arsenic from high antimony secondary soot

Abstract

A method for producing antimony white by removing arsenic from high-antimony secondary dust, which is to mix high-antimony secondary fume, soda ash, and low-temperature carbonization reducing agent into ingredients, mix, and press into material blocks, and then add one layer of coke and one layer of material blocks to the In the blast furnace with multi-layer tuyere and 3-4m high coke column, control the blast intensity of each layer of tuyere to realize reduction dearsenic and high coke column volatilization dearsenic, put the refined alloy into the refining furnace, add caustic soda for Refining to remove impurities in the alloy metal liquid, and then put it into an external hot pot type low-temperature antimony blowing furnace to blow antimony white, cool the antimony white flue gas, and collect dust with a cloth bag to obtain the antimony white product. This method removes most of the arsenic while reducing and smelting the alloy, which can save production costs and greatly increase the direct yield of antimony alloy refining. The quality index of the produced antimony white meets the requirements of the national standard for antimony trioxide. The production of high-grade antimony white from high-antimony secondary dust with high arsenic and lead content has become beneficial and feasible, and the production cost of high-grade antimony white has been reduced.

Description

technical field [0001] The invention relates to antimony nonferrous smelting technology and antimony white production technology, in particular to a method for producing antimony white by removing arsenic from high antimony secondary dust containing high arsenic and lead. Background technique [0002] In the non-ferrous smelting antimony industry, high-grade antimony white is mainly used as a flame retardant additive, and its quality index should meet the requirements of the national standard GB / T 4062-2013 of antimony trioxide. Generally, the national standard No. 1 antimony ingot is used as raw material and produced in a high-temperature antimony white furnace to meet the quality requirements. Therefore, high-grade antimony white has high technical requirements and high raw material costs. The products are gradually monopolized by companies with high-purity antimony ore resources. . Some people use fire method to treat lead anode slime (containing Sb 35-50% by weight), re...

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Problems solved by technology

[0004] Second, use reverberatory furnace to blow air and add alkali to refine arsenic, which is only suitable for alloy raw materials with relatively low arsenic content, such as As<0.5-1.0%. Leading to a sharp rise in production costs and a sharp drop in benefits;

[0005] Third, the low-temperature blowing antimony white production efficiency of the external heating pot type is low, which is related to comprehensive factors such as the antimony content of the alloy in the furnace, the temperature of the antimony white blowing furnace, the layout of the high-pressure gas nozzle, the scum covering and the slag removal method, etc.

[0007] The purpose of the present invention is: aiming at the problems existing in the above-mentioned prior art, propose a kind of method that utilizes high-antimony secondary fumes to remove arsenic to produce antimony white, to solve the problem of producing high-grade antimony with high-antimony secondary fumes containing higher arsenic and lead The problems of high cost and low benefit in Baizhong

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