煤矸石/黄土基陶瓷膜支撑体的制备及烧结特性

Preparation and sintering characteristics of coalgangue/loess-based ceramic membrane support

为了解决陶瓷膜成本过高的问题,以煤矸石和黄土为原料,CaCO 3为造孔剂,羧甲基纤维素(CMC)为黏结剂制备煤矸石/黄土基陶瓷膜支撑体,利用扫描电镜(SEM)、X射线衍射(XRD)及压汞法等方法对陶瓷膜支撑体的物化性质、表面微观形貌、物相组成等进行表征。结果表明:随着烧结温度的升高,支撑体内部形成新的晶相,导致支撑体的纯水通量和抗折强度增加。同时,随着保温时间的延长,颗粒熔融现象更加显著,进而降低支撑体的纯水通量但增加其抗折强度。在烧结温度为1125℃、保温时间为2 h条件下,制得的煤矸石/黄土基陶瓷膜支撑体综合性能较好。此时支撑体的纯水通量为9102.44 L/(m^(2)·h·MPa),抗折强度为12.317 MPa,酸/碱质量损失率分别为6.64%/0.35%,显气孔率为38.26%,孔隙率为49%。

To address the issue of high cost of ceramic membranes,this study utilized gangue and loess as the primary raw materials.CaCO 3 was used as the pore-making agent,and carboxymethyl cellulose(CMC)was used as the binder to prepare a gangue/loess-based ceramic membrane support.The physical and chemical properties,surface micro-morphology,and phase composition were characterized by SEM,XRD and pressed mercury method.The experimental results indicated that an increase in sintering temperature resulted in the formation of new crystalline phases within the carrier.This led to an increase in both the pure water flux and flexural strength of the support body.Meanwhile,with the extension of the holding time,the particle melting phenomenon is more significant,leading to a decrease in pure water flux but an increase in the flexural strength of the carrier.The gangue/loess-based ceramic membrane carrier showed excellent overall performance under the condition of sintering at a temperature of 1125℃ for 2 hours.The carrier showed a pure water flux of 9102.44 L/(m^(2)·h·MPa),a flexural strength of 12.317 MPa,an acid/base mass loss rate of 6.64%/0.35%,respectively,an apparent porosity of 38.26% and a porosity of 49%.