Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 18    No. 5    October 2008

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Purification mechanism of copper electrolyte by As(Ⅲ)
XIAO Fa-xin(肖发新)1, 2, ZHENG Ya-jie(郑雅杰)1, WANG Yong(王 勇)1,
JIAN Hong-sheng(简洪生)1, HUANG Xing-guan(黄兴远)2, MA Yu-tian(马玉天)1

1. School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China;
2. School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471003, China

Abstract:A new kind of precipitate, antimony arsantimonate, was found during the precipitation reactions in acidic solution containing As(Ⅲ), Sb(Ⅲ) and Sb(Ⅴ) by means of chemical analysis, SEM, XRD and IR spectrometry. The results show that the As content in antimony arsantimonate increases with the increase of n(As(Ⅲ))/n(Sb) in solution and the content of component Sb(Ⅲ) and Sb(Ⅴ) remains almost constant with the variation of n(Sb(Ⅲ))/n(Sb(Ⅴ)) in solution. The antimony arsantimonate is a kind of floccules with size of 1−5 μm. The crystal performance of the compound gets better with the decrease of n(As(Ⅲ))/n(Sb), the cell parameter of which is near to 10.33×10−10 m under different n(As(Ⅲ))/n(Sb) and As atom locates on the surface, not in the inner of the grain. The chemical bonds of As—OH, Sb—OH, As—O—Sb, Sb—O—Sb and O—H of the precipitate are included in the precipitate. The chemical structure of precipitate is described as Sb(OH)2—O—[Sb(OH)3—(O—As(OH)—O—Sb(OH)3)3]—O—Sb(OH)2•xH2O. The structure analysis shows that the copper electrolyte can be purified by As(Ⅲ) because the antimony arsantimonate precipitate forms.

 

Key words: arsenic; purification; copper electrolyte; mechanism; antimony arsantimonate

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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