补连塔煤矸石提纯改性及机理分析

Purification and modification of coal gangue in Bulianta and analysis of its mechanism

利用小锥角水力旋流器对补连塔煤矸石进行提纯,采用3-巯丙基三乙氧基硅烷对提纯产品进行有机改性。通过X-射线衍射仪(XRD)、化学元素分析仪(XRF)、红外分析仪(FT-IR)、扫描电镜(SEM)等手段对煤矸石改性机理进行分析。结果表明,提纯前后煤矸石硅铝物质的量比分别为2.88和2.18,提纯效果明显;采用FT-IR、XRD、SEM分析证明二者结合成功,改性煤矸石与3-巯丙基三乙氧基硅烷是通过矿物表面作用而未进入层间;3-巯丙基三乙氧基硅烷以单齿缩合的方式在煤矸石外表面完成接枝。本研究得到的巯基化煤矸石可为其应用于重金属废水吸附材料提供理论支持,减少煤矸石排放造成的环境污染。

This article used a small cone angle hydrocyclone to purify coal gangue from the supplementary tower,and uses 3-mercaptopropyltriethoxysilane to organically modify the purified product.The modification mechanism of coal gangue was analyzed and studied using Xray diffraction(XRD),chemical element analyzer(XRF),infrared analyzer(FT-IR),scanning electron microscopy(SEM)and other methods.The results show that the silicon aluminum molar ratios of coal gangue before and after purification are 2.88 and 2.18,respectively,indicating a significant purification effect.FT-IR,XRD,and SEM analysis show that the combination of the two is successful.The modified coal series kaolin and 3-mercaptopropyltriethoxysilane do not enter the interlayer through mineral surface interaction.3-mercaptopropyltriethoxysilane is grafted onto the outer surface of coal gangue through monodentate condensation.The thiolated coal gangue obtained in this study can provide theoretical support for its application as a heavy metal wastewater adsorption material,reducing environmental pollution caused by coal gangue emissions.