泥质岩在不同pH值溶液中的崩解特性试验研究

Expevimental analysis of slaking characteristics of mudstone in different pH solutions

为了研究泥质岩在不同pH值溶液中的崩解特性,为酸雨地区泥质岩的利用提供理论依据和技术指导,选取阜新海州露天矿泥质岩为例,进行室内浸水崩解试验。对泥质岩在不同pH值溶液中的崩解现象、崩解物的颗粒含量和崩解比进行分析、利用X射线衍射(XRD)、荧光光谱分析,测试岩样矿物化学成分。试验得到以下结论:不同pH值溶液中崩解强度大小关系是:酸>碱>中性;随着循环的进行,泥质岩的崩解程度不断加深,崩解速度先增大后逐渐减小甚至消失;泥质岩中许多不能溶于水的矿物成分可以和酸发生化学反应生成可溶性盐类,是泥质岩在酸中崩解最剧烈的主要原因;考虑泥质岩所处环境pH值不同对工程建设有重要意义。

In order to identify the slaking characteristics of mudstone in different pH solutions and provide some theoretical basis and technical guidance for utilization of mudstone in areas polluted by acid rain ,some laboratory tests of slaking were performed on mudstone from the open‐pit mine of Haizhou in Fuxin .The slaking phenomena in different pH solutions and changes in grain contents and slaking ratio of mudstone samples in slaking process were analyzed .Through X‐ray diffractometer（XRD）and fluorescence spectrum analysis system ,the mineral ＆amp; chemical composition of mudstone were made clear .The test results showed that the rank of these samples as slaking degree was acid〉alkali〉neutral .With an increase in the number of cycles ,the slaking degree decreased while the slaking rate increased at first two cycle ,and then it gradually slowed down . The slaking of mudstone in the acid solutions was the most severe . The fundamental reason was that most of the mineral composition of mudstone could not dissolve in water but chemical reaction between it and acid solutions produced soluble salts . It was significant to take into account the acidity of mudstone＇s surroundings in engineering construction .