Effect of sintering system on properties of coal gangue based support
The low-cost tubular gangue based ceramic membrane support was prepared by extrusion molding and solid particle sintering,using the solid waste gangue produced in the production and processing of coal mine as aggregate,Na2CO3 as sintering aid,hydroxypropyl methylcellulose(HPMC)as binder and carbon powder as pore forming agent.The effects of sintering temperature and heat preservation time on the physical and chemical properties of the support were studied.Scanning electron microscopy(SEM),X-ray diffraction(XRD),mercury intrusion method and other methods were used to systematically characterize the surface micro morphology,crystal phase composition,physical and chemical properties of coal gangue based support.The results show that the crystal phase of the support is mainly composed of quartz,albite and muscovite;On the basis of adding 4％,3％and 15％Na2CO3,HPMC and carbon powder respectively,under the conditions of 900 ℃ sintering temperature and 2 h holding time,the comprehensive performance of the prepared support is the best.At this time,the pure water flux of the support is 2 468 L/(m2·h·MPa),the flexural strength is 24.96 MPa,the porosity is 43.38％,and the acid and alkali corrosion resistance is 4.45％and 0.62％respectively.The coal gangue based ceramic membrane support with high performance and low cost can be prepared by taking the industrial solid waste as the aggregate and sintering at a relatively low temperature,so as to achieve the goal of recycling industrial solid waste and achieving maximum economic benefits.
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维普
