秸秆灰制备硅酸钙板的研究

Preparation of calcium silicate board from biomass straw ash

以秸秆灰和石灰为主要原材料制备硅酸钙板。研究了秸秆灰与石灰比例、水泥用量、养护温度与成型压力对硅酸钙板抗折强度、导热系数的影响。采用XRD、SEM方法分析了硅酸钙板的矿物组成与微观形貌。结果表明,托贝莫来石和石英是硅酸钙板的主晶相,力学性能与导热系数取决于硅酸钙板中托贝莫来石含量和密实度。在最佳条件下秸秆灰用量可达36%,而水泥和纤维的用量分别为10%和3%。此条件下制备的硅酸钙板性能符合JC/T564.1—2008《纤维增强硅酸钙板第1部分:无石棉硅酸钙板》中A类的要求。

This paper aims to prepare the calcium silicate board using biamass straw ash(hereafter referred to as BSA) and lime as the main raw material. The effects of the ratio of straw ash to lime,the amount of cement,the curing temperature and the forming pressure on the flexural strength and thermal conductivity of the calcium silicate board were studied. The mineral phase and microstructure of calcium silicate board were analyzed by XRD and SEM methods. XRD results showed that tobermorite and quartz was the main crystalline phases. The mechanical properties and thermal conductivity largely depend on the content of tobe-morite and the densification of the microstructure of the calcium silicate board. The results showed that,under the optimal preparation conditions,the amount of BSA in the calcium silicate board can be as high as 36% by weight,while the amount of cement and pulp fiber is only 10% and 3% respectively. The properties of calcium silicate board can meet the requirement of the Chinese Standard JC/T 564.1—2008 "Fiber reinforced calcium silicate boards-part 1:Non-asbestos calcium silicate boards" for class-A.