›› 2013, Vol. 13 ›› Issue (1): 0-0.
• 反应与分离 • 下一篇
王为振 陈启元 胡慧萍 谭力铭 陈辉煌
WANG Wei-zhen CHEN Qi-yuan HU Hui-ping TAN Li-ming CHEN Hui-huang
摘要: The zinc-containing dust was oxidatively pretreated with calcium hypochlorite, subsequently leached with ammonia/ammonium bicarbonate solution to obtain the ammoniacal leaching solution, and zinc oxide was produced by ammonia distillation of the ammoniacal leaching solution and subsequent calcination. The elements of iron and manganese could not be detected in ammoniacal leaching solution, and the extraction rate of zinc was 98.2% in ammoniacal leaching process. The zinc oxide content in the product is 99.5%(w), and the contents of iron and manganese in the product were 0.0028‰ and 0.00084‰(w), respectively. The analyses of the valence states of iron and manganese in the zinc-containing dust with and without pretreatment were performed by chemical analysis and XPS, and the possible oxidation mechanism of the oxidative pretreatment of the dust was discussed. It is concluded that Fe2+-oxide and Mn2+-oxide in the dust were oxidized to Fe3+-oxide and/or its hydrate and Mn4+-oxide and/or its hydrate by calcium hypochlorite during the oxidative pretreatment process, respectively.
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