Wet-method recycling and harmless treatment process for antimony smelting arsenic alkali residue

Abstract

The invention belongs to the field of antimony smelting arsenic alkali residue treatment and particularly discloses a wet-method recycling and harmless treatment process for antimony smelting arsenicalkali residue. The process adopts a whole-wet-method treatment process and mainly comprises the eight working procedures of breaking, dissolving for leaching, oxidation for antimony outlet, purification for impurity removing, transition for crystallizing, reduction for arsenic sinking, evaporative crystallization and secondary residue harmless treatment. Recycling and harmless treatment of the arsenic alkali residue, zero emission of waste residue and waste water and up-to-standard discharge of exhaust gas are thoroughly achieved, the long-term plagued arsenic alkali residue environmental pollution problem in the antimony smelting industry in China is thoroughly solved, and the environmental risk caused by stacking the arsenic alkali residue is eliminated; and meanwhile, separation, enrichment and effective recovering of valuable elements are achieved.

Description

technical field [0001] The invention belongs to the field of antimony smelting arsenic-alkali slag treatment, and in particular relates to a wet-process recycling and harmless treatment process for antimony smelting arsenic-alkali slag. Background technique [0002] Arsenic-alkali slag is a kind of hazardous solid waste produced by antimony smelting enterprises. In the antimony smelting process of reverberatory furnace or blast furnace, crude antimony is refined by adding soda ash (sodium carbonate) and caustic soda (sodium hydroxide) , various types of refined antimony are produced, and the waste residue produced at the same time is called arsenic-alkali residue. The main components in arsenic-alkali slag are soda ash (sodium carbonate), arsenic and its compounds, and antimony and its compounds. Compounds account for 1 to 2%. The arsenic and its compounds in the arsenic-alkali slag are highly toxic and easily soluble in water. If they are not kept properly, it is easy to ...

AI Technical Summary

Problems solved by technology

[0008] Although the existing arsenic-alkali slag disposal production line in Xikuangshan can technically realize the reduction and recycling of arsenic-alkali slag, there are still the following problems in actual operation: 1. The secondary slag produced in the leaching section is toxic and leached It is unqualified and still belongs to hazardous solid waste. At present, no good solution has been found, and the harmlessness of arsenic-alkali slag has not been realized; 2. The equipment and pipelines are easy to block, which affects the continuity of production; 3. High energy consumption and high production costs 4. The sodium arsenate produced has a serious sales problem due to its small use range. The sodium arsenate produced by the enterprise cannot be sold and has to be stored in warehouses. As a highly toxic substance, sodium arsenate itself The storage, maintenance and management of hazardous chemicals are very strict

[0013] The arsenic-alkali slag disposal process of Chenzhou Mining Co., Ltd. treats the primary alkali slag produced by antimony pyrometallurgy. The antimony content in the primary alkali slag is about 25%. , the antimony content in the primary alkali slag is high (about 25%), and the antimony content in the leaching slag reaches more than 40%, which can be directly returned to the blast furnace for use without generating waste residue; but this process is not suitable for low-antimony secondary arsenic alkali slag (antimony 2. The valuable resource (sodium carbonate) in the leaching solution has not been effectively recycled, but is disposed of by simple sulfuric acid neutralization and lime removal of arsenic, resulting in a large amount of calcium sulfate The mixed slag with calcium arsenate does not meet the requirements of the circular economy advocated by the state. The mixed slag of calcium sulfate and calcium arsenate also needs to be landfilled after brick making; 3. After neutralization, the lime after arsenic removal The arsenic content in the leaching solution did not meet the national wastewater discharge standard (0.5mg / L), and it was necessary to return to the original sewage treatment system of Chenzhou Mining for further deep arsenic removal

Images