Study on Treatment of Smelting Contaminated Acid by Evaporation Condensing Process

Abstract:

Copper smelting gas producing sulfuric acid process produces contaminated acid which contains high concentration of fluorine, chlorine, arsenic and copper, zinc, lead, cadmium and other metals. The sulfide precipitation and lime neutralization methods have been used at present. Those methods have some deficiencies as which produces a lot of hazardous and unwieldy solid wastes, spends huge processing cost, reuse difficultly the water after treatment. In this paper, according to characteristics of this kind of smelting contaminated acid, evaporation condensing process and the feasibility of recycling arsenic, sulfuric acid and valuable metals were studied. Under the condition of atmospheric heating evaporation, this study explored the distribution characteristics of fluorine, chlorine, sulfate radical, arsenic in condensate and in concentrate and the crystallization removal rates of arsenic trioxide in concentrate at different temperatures and different enrichment ratios. The results show arsenic, fluorine and chloride have good removal rates from contaminated acid by evaporation condensing process. Temperature at 130°C, enrichment multiple in 6~7, the removal rate of arsenic, fluorine and chlorine reached 62%, 88%, 77%. The results also show evaporation condensing process has good application prospects to treat smelting contaminated acid.

• Periodical: Advanced Materials Research (Volumes 881-883)
• Pages: 564-569
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.881-883.564
• Online since: January 2014
• Authors: Da Chao Zhang*, Xiao Lai Liu, Da Ming Guan, Xiao Yi Xu, Su Ying Wu
• Keywords: Arsenic, Chlorine, Evaporation Condensing Process, Fluorine, Smelting Contaminated Acid

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