Incorporation of arsenic into gypsum: Relevant to arsenic removal and immobilization process in hydrometallurgical industry

被引：86

作者：

Zhang, Danni ^{[1
]}

Yuan, Zidan ^{[1
]}

Wang, Shaofeng ^{[1
]}

Jia, Yongfeng ^{[1
]}

Demopoulos, George P. ^{[2
]}

机构：

[1] Chinese Acad Sci, Inst Appl Ecol, Key Lab Pollut Ecol & Environm Engn, Shenyang 110016, Peoples R China

[2] McGill Univ, Dept Min & Mat Engn, Montreal, PQ H3A 2B2, Canada

来源：

JOURNAL OF HAZARDOUS MATERIALS | 2015年 / 300卷

基金：

中国国家自然科学基金;

关键词：

Arsenic; Incorporation; Gypsum; X-RAY-DIFFRACTION; CRYSTALLINE SCORODITE; MINE; COPRECIPITATION; COORDINATION; FERRIHYDRITE; SOLUBILITY; ADSORPTION; SPECIATION; CHEMISTRY;

D O I：

10.1016/j.jhazmat.2015.07.015

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Gypsum precipitates as a major secondary mineral during the iron-arsenate coprecipitation process for the removal of arsenic from hydrometallurgical effluents. However, its role in the fixation of arsenic is still unknown. This work investigated the incorporation of arsenic into gypsum quantitatively during the crystallization process at various pHs and the initial arsenic concentrations. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray absorption near edge spectroscopy (XANES) and scanning electron microscopy (SEM) were employed to characterize the coprecipitated solids. The results showed that arsenate was measurably removed from solution during gypsum crystallization and the removal increased with increasing pH. At lower pH where the system was undersaturated with respect to calcium arsenate, arsenate ions were incorporated into gypsum structure, whereas at higher pH, calcium arsenate was formed and constituted the major arsenate bearing species in the precipitated solids. The findings may have important implications for arsenic speciation and stability of the hydrometallurgical solid wastes. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：272 / 280

页数：9

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