利用固废煤矸石制备陶粒支撑剂的研究

Preparation of Ceramic Proppant Using Solid Waste Coal Gangue

为了降低支撑剂的生产成本,利用煤矸石制备出莫来石基陶瓷支撑剂。实验主要涉及强力混合机内支撑剂的成球造粒工艺和后续不同温度下的烧结过程。通过研究所制备陶粒支撑剂的物相组成、微观结构、密度及破碎率发现:随着烧结温度的升高,支撑剂主要物相转变为棒状莫来石,并形成交联穿插结构,有助于提高支撑剂的致密度,从而造成在35 MPa闭合压力下支撑剂的破碎率呈下降趋势,当温度为1 450℃时,破碎率达到最低值6.76%。由于制备工艺简单,设计可行,支撑剂性能良好,因此,合理开发利用固废煤矸石制备陶粒支撑剂具有较好的应用前景。

Coal gangue is used to prepare a mullite-based ceramic proppant to reduce production cost.The experiment mainly involves the pelletizing granulation process of the proppant in the intensive mixer and the subsequent sintering process at different temperatures.The phase composition,microstructure,density and breakage rate of the ceramic proppant were studied.Results show that,with the increasing of the sintering temperature,the main phase of the proppant changed into rod-shaped mullite and a cross-linked interpenetrating structure formed,which could increase the density of the proppant.At a closing pressure of 35 MPa,the breakage rate of the proppant tends to decline.When the temperature is 1 450 ℃,the breaking rate reaches a minimum value(6.76%).Because of simplicity of the preparation process,the feasibility of the design,and ideal proppant performance,developing and using solid waste coal gangue to prepare ceramic proppant is promising.