摘要
在硫酸钙高温分解行为的研究基础上,探讨了氧化物SiO_2、Fe_2O_3、ZnO和SiO_2_Fe_2O_3、CaCO_3-Al_2O_3复合添加剂对硫酸钙分解的影响。结果表明ZnO、SiO_2、SiO_2-Fe_2O_3均有利于固硫,这分别与反应过程中形成能起包覆作用的Ca_2SiO_4和耐热含硫物相Ca2Fe2S2O3有关;复合添加剂CaCO3_Al2O3固硫效果更佳,当CaCO3∶Al2O3∶CaSO4摩尔比为3∶3∶1时,固硫作用最理想,1400℃时CaSO4的分解率从87.5%降低到21.2%,这与形成大量高温耐热物相硫铝酸钙有关。
The decomposition behavior of calcium sulfate and the influence of various additives at high temperature were investigated in this paper. The results show that SiO2, ZnO and the compound of SiO2-Fe2O3 can effectively restrain the decomposition of calcium sulfate, attributed mainly to the formation of new products Ca2SiO4 and Ca2Fe2S2O3. A high sulfur retention rate can be achieved by incorporating compound AlzO3-CaCO3 into CaSO4 at the molar ratio of CaCO3 ： Al2O3 ： CaSO4 = 3 ： 3 ： 1, and XRD proves that large amounts of sulfoaluminates occur in the slag.
出处
《岩石矿物学杂志》
CAS
CSCD
北大核心
2005年第6期587-590,共4页
Acta Petrologica et Mineralogica
基金
中国地质大学(北京)校内基金资助项目(51900961008)
关键词
氧化物
复合添加剂
固硫产物
硫酸钙
硫铝酸钙
oxide
compound additives
sulfur retention products
calcium sulfate
sulfoaluminate
