不同矿物组成煤的矸石泥化试验研究

Experimental Research on Coal Gangue Argillization of Different Minaral Composition

通过对枣庄、榆林、淮北3个不同地区的煤矸石进行泥化试验,结果表明,枣庄矸石泥化现象最为严重,榆林矸石泥化次之,淮北矸石泥化较轻。经XRD分析发现,枣庄煤矸石含有大量高岭土,榆林煤矸石含有高岭土、方解石、石英等矿物,而淮北煤矸石主要矿物为石英,得出含有大量高岭石和蒙脱石是枣庄矸石泥化程度高的重要原因。经过XRF分析发现,煤矸石中的硅铝比分别为1.49、1.77、1.96,依次增加,并从烧失量的变化进一步验证了3种煤矸石中石英或类石英矿物的含量依次增加,从而推断出矿物组成的差异是造成矸石泥化程度不同的主要原因。在选煤厂实际生产过程中,可以预先对煤矸石的矿物组成进行测定,得出矸石泥化程度,通过采用各种手段,降低其对煤泥水的影响,保证选煤厂正常生产。

The coal gangue argillization tests are conducted from ZaoZhuang,YuLin and HuaiBei coal mine areas,and the results show that the argillization degree of coal samples from the three places is list in a decreasing order：ZaoZhuang,YuLin and HuaiBei.According to the XRD results,there is a large content of kaolin mineral in the sample from ZaoZhuang,and kaolin,calcite and quartz mineral in that from YuLin,and the primary mineral of coal gangue from Huaibei is quartz.It concludes that the important reason of high degree argillization for Zaozhuang coal gangue is contains a lot of kaolin and montmorillonite,The silica-alumina ratio obtained by XRF test is 1.49,1.77,1.96 for the three samples,which is an increasing order.It is also confirmed by the Ignition loss test which indicates an increasing order of quartz or similar minerals.From the above tests,it deduces that the difference in mineral composition is the primary cause for the difference in argillization degree.In actual production process of coal preparation plant,the mineral composition of coal gangue can been determined in advance,it can obtain the argillization degree of coal gangue,and then by using all kinds of methods,reduces the influence to coal slime water,and maintains the normal production of coal preparation plant.