氧化铝熟料溶出过程二次反应的热力学讨论

对氧化铝熟料溶出过程涉及的二次反应进行了热力学计算和讨论。对原硅酸钙在铝酸钠溶液中的稳定性、硅酸钙与铝酸钠溶液的反应、水化石榴石与NaOH和Na₂CO₃作用和原硅酸钙水化反应分别进行了热力学分析。结果表明，原硅酸钙、硅酸钙在NaOH、Na₂CO₃和NaAl(OH)₄这3种溶液成分中的稳定性是不同的；温度升高，NaOH、Na₂CO₃溶液分解水化石榴石的趋势变大，饱和系数较大的水化石榴石稳定性好于饱和系数较小的，水化石榴石在NaOH中的稳定性强于在Na₂CO₃溶液中的；低温下原硅酸钙最有可能水化成2CaO·SiO₂·1.17H₂O和4CaO·3SiO₂·1.5H₂O。

Thermodynamic analysis of secondary reactions in the clinker leaching process

Thermodynamic computations and discussion of some reactions involved in the clinker leaching process are described. The stability of 2CaO·SiO₂ in sodium aluminate liquor, the reactions between calcium silicate and sodium aluminate liquors, the reactions between hydrogarnet and NaOH and Na₂CO₃, and the hydration of 2CaO·SiO₂ have all been analyzed in thermodynamic terms. The results indicate that the stability subsequences of 2CaO·SiO₂ and calcium silicate in the three alkaline solutions are dissimilar. The decomposition tendency of hydrogarnet in NaOH and Na₂CO₃ solutions increases with elevation of temperature. The stability of hydrogarnet with large saturation coefficient is higher than that with smaller saturation coefficient. Hydrogarnet is more stable in NaOH solution than in Na₂CO₃ solution. At low temperatures, hydration of calcium orthosilicate to afford 2CaO·SiO₂·1.17H₂O and 4CaO·3SiO₂·1.5H₂O is thermodynamically most favorable. 