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Zhang Y.,Inner Mongolia Agricultural University | Yang X.,Inner Mongolia Agricultural University | Kang X.,Inner Mongolia Agricultural University | Yang X.,The Fourth Engineering Co. | Qin H.,Inner Mongolia Agricultural University
Yingyong Jichu yu Gongcheng Kexue Xuebao/Journal of Basic Science and Engineering | Year: 2014

Coal gangue (CG) samples were immersed by different acid solutions which simulated different acidic and alkaline environment. The pH values of the immersion solutions were determined after immersion. XRD and shear strength tests were used to measure the change of chemical composition and strength of the coal gangues. The results showed that, the main factors effecting on pH value of the immersion solutions were the origin of the samples, soaking time, solid-liquid ratio and pH value of prepared solution. The pH value of the immersion solutions were changed with immersion time. The values were reached the highest point on the end of first day. The pH values of D-CG, X-CG and AGG were increased with the decreasing of solid-liquid ratio when treated by neutral solution; When with acid solution, the pH values of D-CG and AGG were decreased with the decreasing of solid-liquid ratio; The pH values of W-CG were increased with the decreasing of solid-liquid ratio after soaked by alkaline solution. When treated with neutral, acid and alkaline solution, α-Quartz, Kaolinite and Anorthite crystal were dissolved from D-CG and AGG; α-Quartz crystal were dissolved, Kaolinite and Anorthite crystal were disintegrated from X-CG; Kaolinite crystal was disintegrated, α-Quartz and Anorthite crystal were disintegrated from W-CG. As soaked with solutions, α-Quartz crystal were separated from D-CG; The shear strength of D-CG samples mixed with clay were enhanced owing to activity of α-Quartz; The shear strength of X-CG and W-CG samples were weakened as a result of the disintegration α-Quartz, Kaolinite and Anorthite crystal. Therefore, the performance of D-CG in resistance to acid and alkaline corrosion was higher than that of W-CG and X-CG. Source

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