Behavior of calcium silicate in leaching process

来源期刊：中国有色金属学报(英文版)2003年第1期

论文作者：刘桂华 李小斌 彭志宏 周秋生

文章页码：213 - 216

Key words：sinter; leaching; β-2CaO·SiO₂; CaO·SiO₂

Abstract: Based on the thermodynamic calculation, the mole ratio of CaO to SiO₂, temperature and A/S of bauxite have a profound influence on the mole ratio of 2CaO·SiO₂ to CaO·SiO₂ in sinter. CaO·SiO₂ and β-2CaO·SiO₂ appear stable in caustic solution but unstable in soda solution, and CaO·SiO₂ is more stable than β-2CaO·SiO₂ under the same leaching condition. Compared with the conventional sinter, the rate of alumina extraction of the new sinter is large and the secondary reaction is restricted in the leaching, which might be mainly due to the more content of CaO·SiO₂ in sinter and better stability of CaO·SiO₂ in leaching.