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《Chinese Journal of Environmental Engineering》 2012-01
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Study on preparing active zinc oxide using zinc of blast furnace sludge

Luo Wenqun1 Liu Xian2 Yang Yunquan1 He Heng1 Gao Bo1(1.School of Chemical Engineering,Xiangtan University,Xiangtan 411105,China; 2.Energy and Enviroment Department,Xiangtan Iron and Steel Corporation of Hunan Hualing Group,Xiangtan 411101,China)  
Active zinc oxide was prepared by pyrometallurgy enrichment and followed by wet leaching using zinc-containing blast furnace sludge as raw material.The effects of temperature and time on zinc volatilization efficiency and zinc oxide content from the sludge were studied in the pyrometallurgy enrichment process.The optimum condition was that the calcination temperature increased from room temperature to 1 000 ℃ with a rate of 10 ℃/min temperature programme and then remained for 1 h under nitrogen atmosphere.The zinc oxide content and zinc volatilization efficiency was high to 82.24% and 97%,respectively.The effects of temperature,the amount of ammonia and ammonium bicarbonate and the ratio of liquid to solid on the zinc oxide leaching efficiency in the wet leaching process were also investigated.The optimal conditions were that with 40 ℃ of leaching temperature,two times of theory amount of ammonia and ammonium bicarbonate,4∶ 1 ratio of liquid to solid and 2 h of leaching time,the zinc oxide leaching efficiency was high to 99.9%.The precursor basic zinc carbonate,obtained in the wet leaching,was calcined to produce active zinc oxide with a purity of 98.4%.The total recovery efficiency of zinc oxide was high to 95.3%.
【Fund】: 湖南省科技攻关项目(2009SK4020);; 湖南华菱湘潭钢铁有限公司合作项目
【CateGory Index】: X757
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