| 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. |
| 关键词: 煤矸石 酸雨 浸泡试验 X射线衍射 强度 |
| DOI：103969/j.issn1007 9629201402026 |
| 分类号: |
| 基金项目: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 |
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| Research on Dissolution Characteristics of Coal GangueImmersed in Different Acid Solutions |
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ZHANG Yan1, YANG Xiaoyun1, GUO Liyong1, HAN Chao1, ZHOU Tianping2
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1.Energy and Traffic Engineering College, Inner Mongolia Agricultural University, Huhhot 010018, China;2.Jining Track Division, Hohhot Railway Bureau, Jining 012000, China
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| Abstract: |
| Four kinds of coal gangue, which were sampled from Dongsheng(D CG), Xuejiawan(X CG), Wuhai(W CG) and the aggregate from practical road construction(AGG), were immersed in different acid solutions to simulate acid rain in lab. The pH values of the immersion solutions were measured and mass loss rate of the coal gangue was calculated after immersion. XRD and shear strength tests were used to measure the change of chemical composition and strength of the coal gangue. The results show that the effect of soaking time, ratio of solid to liquid, chemical constituents of the coal gangue, and acidity of soaking solution on the pH value is significant. Immersed in acid solution, pH values of D CG and AGG increase, X CG and W CG decrease, while immersed in neutral solution, pH values of D CG, X CG and W CG decrease more than that of AGGs. The mass loss rate of the coal gangue in acid solutions is higher than that in neutral solution. The strength of the coal gangue in acid solutions is lower than that in neutral solution. The results of XRD spectrum indicate that the structure and mineral constituent of samples are decomposed and the crystal structures are damaged in acid solutions, with the result that mass loss rate of the coal gangue increases. |
| Key words: coal gangue acid rain soaking test X ray diffraction(XRD) strength |
