煤矸石碳热还原氮化制备Sialon的研究

PREPARATION OF SIALON BY REDUCTION-NITRIDATION FROM COAL GANGUE

采用河北开滦地区的煤矸石为原料,加入一定量的碳和TiO2作为添加剂,通过碳热还原氮化法制备出了β-Sialon材料,并且β-Sialon为主晶相。实验结果经X射线衍射分析测定了反应生成物的物相组成,分析研究了C含量和Al2O3/SiO2的比例对产物组分的影响。研究结果表明,过量加入C,不利于β-Sialon相的生成或导致其有分解的趋势;适当过量加入Al2O3,有助于β-Sialon相的形成。对β-Sialon形成过程的分析表明,在实际生产工艺中可以通过控制CO的含量来控制β-Sialon生成反应进行的速度。

In this paper,Coal Gangue from Kailuan region of Hebei Province,adding a certain amount of C and TiO 2 as additive,make β-Sialon materials by reduction-nitridation method.And β-Sialon is the main crystal phase.The results of the phase composition of reaction products is measured by X-ray diffraction analysis,analyzing the impact of the C content and the ratio of Al 2O3/SiO2.The results show that adding excess C is not conducive to the generation of β-Sialon phase or cause a breakdown trend.And also,adding the appropriate excess Al 2O3 helps with the formation of β-Sialon.In the actual production process,the content of CO can be controlled to control formation speed for β-Sialon.