Method for recovering antimony and solid arsenic from arsenic-containing crystal substance

Abstract

The invention discloses a method for recycling antimony through acid leaching of arsenic-containing crystal substances, fixing arsenic in arsenic-rich pickle liquor and recycling sodium salt through concentration and crystallization of liquor after arsenic fixing, and relates to the field of resource utilization of by-products in production of non-ferrous metal chemicals. According to the method, arsenic-containing crystal substances in sodium pyroantimonate production are leached through dilute sulphuric acid to obtain cubic crystal sodium pyroantimonate which meets the first-grade product of the Chinese nonferrous metal industry standard (YS / T 22-2010), and the technical problem of recycling antimony in the arsenic-containing crystal substances is solved. Ferrite is added into the arsenic-rich acid leaching solution, oxygen is introduced into the arsenic-rich acid leaching solution to synthesize the high-stability scorodite and goethite core-shell structure, the arsenic concentration in TCLP is lower than the specified value 5 mg / L of the national standard (GB5085.3-2007), and non-toxic and harmless arsenic in arsenic-containing non-ferrous metal resource utilization is achieved. And concentrating and crystallizing the arsenic-fixing liquid to recover the sodium salt, thereby completing the purification and regeneration of the solution and achieving the purpose of closed-loop cyclic utilization of the solution. The method has the advantages of simple operation, stable product components, high stability of the arsenic fixing material, good solution cycle performance and the like.

Description

A method for recovering antimony and solid arsenic from arsenic-containing crystals technical field The present invention relates to by-product resource utilization field in non-ferrous metal chemical production, be specifically related to a kind of from arsenic-containing Method for recovering antimony from crystals and synthesizing core-shell solid arsenic products. Background technique [0002] The abundance of arsenic in the earth's crust is 1.5 to 5 mg / kg, and more than 87% of it is associated or symbiotic with non-ferrous metal minerals. During the mining, beneficiation, smelting and product processing of metal mineral resources, the original mineral state is destroyed and released into the environment, causing great damage. ecological pressure. Arsenic enters the product in the smelting process and contains arsenic by-products [Hza B, Gla B, Lz C, et al. al.Strategies for arsenic pollutioncontrol from copper pyrometallurgy based on the study of arsenic source...

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Problems solved by technology

[0006] In order to solve the problems of antimony recovery in the existing arsenic-containing crystals, non-toxic and harmless high-arsenic solution and solution recycling, the first purpose of the present invention is to use dilute sulfuric acid solution to leach arsenic-containing crystals to dissolve sodium arsenate Generate arsenic acid (root) into the solution, and sodium pyroantimonate is insoluble in dilute sulfuric acid and remains in the precipitate to realize antimony recovery

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