硅藻土煅烧处理及其孔隙性能研究

Study on the Pore Properties of the Diatomite by Calcining Treatment

硅藻土具有独特的多孔壳体结构,研究了不同温度以及添加助熔剂条件下煅烧处理对其孔隙性能的影响。通过XRD、SEM和BET等技术对材料的微观结构、颗粒孔隙形貌和孔径分布等性能进行分析。结果表明,在800℃和900℃处理下硅藻土的平均孔径增大,1000℃煅烧处理晶体结晶度增加,颗粒熔融液相产生,原始孔隙熔化缩小,比表面积和孔径分布呈现缩小趋势。硅藻土添加助熔剂煅烧处理,在950℃较低温度下材料形成熔融玻璃化产物,煅烧温度进一步提高颗粒开始严重熔融,孔隙特征损失明显。

The diatomite has a unique porous shell structure,and the effect of calcining treatment on the pore properties of the diatomite at different temperatures and flux additions was investigated. The microstructure,pore morphology and pore size distribution of the material were analyzed by XRD,SEM and BET techniques. The results show that the average pore diameter of diatomite increased at 800 ℃ and 900 ℃,and the crystallinity of calcined material at 1000 ℃ increased,the melted liquid phase of the particles is generated,the original pores melted and the specific surface area and pore size distribution tend to shrink. Calcining agent was added into the material. At a lower temperature of 950 ℃, the material forms a molten vitrification product. As the calcining temperature further increased,the particles began seriously melting,and the pore characteristics is lost significantly.