煤矸石在不同酸溶液中的溶出特征研究

发布时间：2019-06-19 17:35

【摘要】：模拟酸雨环境,用不同pH值溶液浸泡东胜煤矸石(D-CG)、薛家湾煤矸石(X-CG)、乌海煤矸石(W-CG)和对照集料(AGG),测定浸泡液的pH值和煤矸石的质量损失率,并采用X射线衍射XRD进行成分测定和结晶分析,探讨煤矸石被酸化腐蚀的机理.结果表明:浸泡液pH值的主要影响因素有浸泡时间、固液比、试样化学成分、浸泡溶液的酸度,在1d内浸泡液pH值的变化幅度最大,之后趋于稳定;固液比越大,pH值变化越大;D-CG和AGG酸性浸泡液的pH值变化规律一致,X-CG和W-CG的变化规律相似;各样品在酸性浸泡条件下的质量损失率较大的主要原因是其晶体结构遭到了不同程度的破坏,同时也使其抗剪强度降低.
[Abstract]:simulating the acid rain environment, soaking the Dongsheng coal stone (D-CG), the Xujiawan coal stone (X-CG), the Wuhai coal stone (W-CG) and the control aggregate (AGG) in different pH value solutions, and determining the pH value of the soaking solution and the mass loss rate of the coal-fired stone, X-ray diffraction (XRD) was used to carry out the component measurement and the crystallization analysis, and the mechanism of the acid corrosion of the coal-fired stone was discussed. The results show that the main influencing factors of the pH value of the soak solution include the soaking time, the solid-liquid ratio, the chemical composition of the sample, the acidity of the soaking solution, the change of the pH value of the soaking solution in the first day is the largest, and then it is stable; the larger the solid-liquid ratio, the greater the change of the pH value; The change of the pH value of the D-CG and the AGG acidic soaking solution is consistent, and the variation of X-CG and W-CG is similar. The main reason for the large mass loss rate of each sample under the condition of acid soaking is that its crystal structure is damaged by different degree, and the shear strength is also reduced.
【作者单位】：内蒙古农业大学能源与交通工程学院;呼和浩特铁路局集宁工务段;
【基金】：内蒙古自治区科技计划项目(20110518) 内蒙古自然科学基金资助项目(2012MS0613) 内蒙古农业大学学生科技创新基金资助项目
【分类号】：U414

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