Stability of calcium silicate in basic solution  

作　　者：刘桂华 李小斌 彭志宏 周秋生 

机构地区：[1]School of Metallurgical Science and Engineering Central South University, Changsha 410083, China

出　　处：《中国有色金属学会会刊：英文版》2003年第5期1235-1238,共4页Transactions of Nonferrous Metals Society of China

基　　金：Project(G19990 64 910 )supportedbytheNationalKeyFundamentalResearchandDevelopmentProgramofChina,project(5 0 2 74076)supportedbytheNationalNaturalScienceFoundationofChina

摘　　要：Mixture of CaO and SiO 2 was sintered at 1 200 or 1 400 ℃ according to the mole ratio of CaO/SiO 2 of 1 or 2, and then calcium silicate was leached in pure caustic or soda solution. The results indicated that calcium silicate exists much more stably in caustic solution than that in soda solution, and CaO·SiO 2 is more stable than β 2CaO·SiO 2 whether in caustic solution or in soda solution. The increase of sintering temperature favored the stability of calcium silicate in the leaching process. When β 2CaO·SiO 2 was leached in soda solution, the increase of leaching temperature and time resulted in decomposing of more calcium silicate. And when β 2CaO·SiO 2 was leached in caustic solution at high temperature, much 2CaO·SiO 2·H 2O but little CaO·SiO 2·H 2O appeared in slag.Mixture of CaO and SiO 2 was sintered at 1 200 or 1 400 ℃ according to the mole ratio of CaO/SiO 2 of 1 or 2, and then calcium silicate was leached in pure caustic or soda solution. The results indicated that calcium silicate exists much more stably in caustic solution than that in soda solution, and CaO·SiO 2 is more stable than β 2CaO·SiO 2 whether in caustic solution or in soda solution. The increase of sintering temperature favored the stability of calcium silicate in the leaching process. When β 2CaO·SiO 2 was leached in soda solution, the increase of leaching temperature and time resulted in decomposing of more calcium silicate. And when β 2CaO·SiO 2 was leached in caustic solution at high temperature, much 2CaO·SiO 2·H 2O but little CaO·SiO 2·H 2O appeared in slag.

关 键 词：硅酸钙 稳定性 腐蚀性溶解 碳酸钠溶液 氧化铝烧结 

分 类 号：TF827[冶金工程—有色金属冶金]