高温固硫物相硫铝酸钙的生成过程研究

Sulphoaluminate calcium is not only a very desulfuration product at high temperature，but also a primary material of a new special type of cement. The formation process of sulphoaluminate calcium at different temperatures and the influence of additive on the formation of sulphoaluminate calcium were studied by XRD, SEM and intelligent sulfur measuring apparatus(KZDL4M). The results indicate that the sulphoaluminate calcium can be formed at the temperature ranging from 1150℃ to 1450℃，12CaO·7Al2O3 can be produced simultaneously. When the temperature is higher than 1400℃， the sulphoaluminate calcium decomposing to 3CaO·Al2O3. MgO promotes the formation of sulphoaluminate calcium. Fe2O3 can promote the formation of sulphoaluminate calcium under low temperature， whereas it will promote its decomposition under high temperature. SiO2 will restrain the decomposition of CaSO4 effectively under high temperature， which makes against the formation of sulphoaluminate calcium.