Pyrite oxidation inhibition by organosilane coatings for acid mine drainage control
Pyrite oxidation inhibition by organosilane coatings for acid mine drainage control
复制标题
有机硅烷涂层抑制黄铁矿氧化用于酸性矿山排水控制
DOI：
10.1016/j.mineng.2014.12.020
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发表时间：
2015-03-01
影响因子：
4.8
通讯作者：
Liang, Libo
中科院分区：
文献类型：
--
作者：
Ouyang, Yuting;Liu, Yun;Liang, Libo
采用电化学方法和传统的化学浸出方法，研究了γ-巯丙基三甲氧基硅烷（PropS-SH）、γ-氨丙基三甲氧基硅烷（CAPS）和乙烯基三甲氧基硅烷（VTMS）等有机硅烷涂层在酸性条件下抑制黄铁矿氧化的潜力。采用傅里叶变换红外光谱（FT-IR）和X射线光电子能谱（XPS）对包覆后的黄铁矿样品进行了分析。电化学测试结果表明，所研究的涂料均能抑制黄铁矿的氧化，其抑制效果为PropS-SH > VTMS > APS。化学浸出试验结果表明，APS、VTMS和PropS-SH涂层分别使黄铁矿氧化降低了49.4%、71.4%和89.2%（以铁释放量计）。抑制作用的机理可能是在黄铁矿表面形成Si-O-Si和Si-O-Fe键的交联网络，抑制侵蚀性物种的渗透。(C)2014爱思唯尔有限公司版权所有。
By using electrochemical techniques and conventional chemical leaching approach, the potential of organosilane coatings to suppress the pyrite oxidation under acidic conditions was investigated, including gamma-mercaptopropyltrimethoxysilane (PropS-SH), gamma-aminopropyltrimethoxysilane CAPS) and vinyltrimethoxysilane (VTMS). The coated pyrite samples were analyzed by Fourier transforms infrared reflection (FT-IR) spectroscopy and X-ray photoelectron spectrometer (XPS). The results from electrochemical tests have indicated that all the studied coatings could suppress the oxidation of pyrite and the inhibition efficiency should follow the sequence of PropS-SH > VTMS > APS. The results of chemical leaching experiments have showed that pyrite oxidation was decreased by 49.4%, 71.4% and 89,2% (based on Fe release) respectively by using APS, VTMS and PropS-SH coatings. The mechanism of inhibition action could possibly be the formation of a cross-linking network of Si-O-Si and Si-O-Fe bonds on the pyrite surface which could restrain the permeation of aggressive species. (C) 2014 Elsevier Ltd. All rights reserved.