Pyrite oxidation inhibition by organosilane coatings for acid mine drainage control

被引：70
作者：
Ouyang, Yuting [1 ]
Liu, Yun [1 ]
Zhu, Runliang [1 ]
Ge, Fei [1 ]
Xu, Tianyuan [1 ]
Luo, Zan [1 ]
Liang, Libo [1 ]
机构：
[1] Xiangtan Univ, Dept Environm Sci & Engn, Xiangtan 411105, Hunan, Peoples R China
来源：
MINERALS ENGINEERING | 2015年 / 72卷
基金：
中国国家自然科学基金;
关键词：
Pyrite; Acid mine drainage (AMD); Inhibition; Organosilane coating; CORROSION PROTECTION; WASTE ROCK; IRON; SURFACES; PH; ENVIRONMENT; MECHANISM; PRODUCTS; SILICATE; BINDING;
D O I：
10.1016/j.mineng.2014.12.020
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
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.
引用
收藏
页码：57 / 64
页数：8
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