Research status on composition, structure, and leaching stability of an arsenic solidification mineral scorodite

doi:10.11949/j.issn.0438-1157.20160556

Abstract

Abstract:

The research status on the composition, structure and leaching stability of scorodite, a well known arsenic solidification mineral, was reviewed. The scorodite samples prepared under different conditions had varying compositions due to the inclusion of sulfate together with the change of crystal water amount. Two structure models of scorodite were proposed as bidentate binuclear model and bidentate mononuclear model separately, but there was controversy on which one being true. The solubility product of scorodite fluctuated between 10^-21.17and 10^-25.83. The leaching stability of scorodite was higher in weak acidic (pH 2-6) solutions under oxidative conditions than that in strong acidic and alkaline solutions or under reductive conditions. Thus, it was concluded that scorodite could be stockpiled safely but in weak acidic (pH 2-6) and oxidative environment.

Key words: scorodite, composition, structure, solubility, leaching stability, oxidation, reduction, equilibrium

摘要：

综述了固砷矿物臭葱石的组成与结构性能，及其浸出稳定性研究现状。不同条件下制备的臭葱石样品，会因SO₄^2-夹杂和结晶水量变化，具有不同的组成。已提出双齿双核和双齿单核两种臭葱石结构模型，两者是否属实尚存在争议。臭葱石的溶度积介于10^-21.17~10^-25.83之间波动。在弱酸性（pH 2~6）、氧化条件下，臭葱石浸出稳定性较高，能较好满足长期堆存要求；而在强酸性或碱性区域，或在还原性条件下，其浸出稳定性较差。

关键词: 臭葱石, 组成, 结构, 溶解度, 浸出稳定性, 氧化, 还原, 平衡

CLC Number:

TF811

KE Pingchao, LIU Zhihong, LIU Zhiyong, LI Yuhu, LIU Fupeng. Research status on composition, structure, and leaching stability of an arsenic solidification mineral scorodite[J]. CIESC Journal, 2016, 67(11): 4533-4540.

柯平超, 刘志宏, 刘智勇, 李玉虎, 刘付朋. 固砷矿物臭葱石组成与结构及其浸出稳定性研究现状[J]. 化工学报, 2016, 67(11): 4533-4540.

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