低品位硅藻土的水热固化过程及其力学性能研究  

Hydrothermal Solidification of Low-grade Diatomite and Its Mechanical Property

作　　者：佟钰[1] 朱长军[1] 刘俊秀[1] 高见[1] 夏枫[1] 曾尤[1] 王晴[1] 

机构地区：[1]沈阳建筑大学材料科学与工程学院,沈阳110168

出　　处：《硅酸盐通报》2013年第3期379-383,共5页Bulletin of the Chinese Ceramic Society

基　　金：辽宁省硼行业高新技术研发项目(PYF233);辽宁省教育厅科学项目计划(L2010446)

摘　　要：以低品位硅藻土、氢氧化钙和水为主要原料,系统考察了焙烧活化制度、原料配比、水热反应条件、成型压力等工艺条件,对硅藻土水热固化体力学强度和微观结构的影响规律,并对其作用机制进行细致讨论。实验通过硅藻土的焙烧活化以及反应配比和水热反应参数的优化,控制形成结晶性水化硅酸钙即托勃莫来石相,所获样品具有轻质高强性能特征。研究结果可用于低品位硅藻土的强化固化,并将其转化为具有较高经济价值的建材制品,满足当前市场对高防火性无机建筑保温材料的迫切需求。Low-grade diatomite and calcium hydrate were used as the starting materials to produce tobermorite-based specimens by a process of hydrothermal solidification, in which the mechanical strength and X-ray diffraction （XRD） characteristics were investigated and discussed in details to reveal the effects of calcination processing, mixing ratio of the starting materials, temperature and time of the hydrothermal reaction and so on. The optimized conditions for the calcination processing and hydrothermal solidification were suggested to obtain the tobermorite-based products figured out with light weight and high strength. The results can be used to realize the hydrothermal solidification of diatomite, to upgrade the commercial benefits of low-grade diatomite, and to meet the urge demands of inorganic heat insulators for buildings.

关 键 词：硅藻土 水热固化 力学性能 托勃莫来石 

分 类 号：TQ172[化学工程—水泥工业]