Determination of arsenic speciation in secondary zinc oxide and arsenic leachability

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• 作者：Yu-hu LI ; ^{lyh_csu@163.com} ; Zhi-hong LIU ; Zhong-wei ZHAO ; Qi-hou LI ; Zhi-yong LIU ; Li ZENG
• 关键词：secondary zinc oxide ; arsenic species ; alkali leaching ; arsenic removal
• 刊名：Transactions of Nonferrous Metals Society of China
• 出版年：2012
• 期刊代码：12_10036326
• 类别：ms
• 出版时间：May, 2012
• 卷：22
• 期：5
• 页码：1209-1216
• 文件大小：986 K

摘要

The species of arsenic in secondary zinc oxide generated from fuming furnace were investigated. The results revealed that there are mainly three types of secondary zinc oxide based on three arsenic species. The main phase of As is As₂O₃ in type I, zinc arsenite (Zn(AsO₂)₂) in type II and lead arsenate (Pb(As₂O₆), Pb₄As₂O₉) in type III, respectively. Selective leaching of zinc oxide of type II was carried out. The leaching rate of As kept at 65%-70%with 30 g/L NaOH and L/S ratio of 3 at 20 掳C for 1 h, while the losses of Pb and Zn were both below 1%.