碱-碳酸盐反应热力学讨论

Thermodynamics of alkali-carbonate reactions

应用热力学方法探讨了温度对碱 碳酸盐反应的影响 ,反应温度升高时 ,反应的推动力减弱。对碱与碳酸盐发生反应生成沉淀时所需碱的浓度以及温度的影响进行了讨论。 2 98K ,pH≥ 10 .6时 ,碱 碳酸盐反应能发生 ,反应温度升高 ,碱 碳酸盐反应所需碱的浓度相应增大。对氢氧化锂与碳酸盐反应可能生成碳酸锂沉淀时溶液的碱的浓度作了计算 ,2 98K ,pH≥ 13.1时 ,氢氧化锂与碳酸盐反应除生成水镁石和方解石外还能生成碳酸锂沉淀 ,反应温度升高时 。

The influence of temperature on alkali carbonate reaction (ACR) was studied by thermodynamics. The driving force of the reaction weakens when reaction temperature rises. Alkalinity and temperature influence were discussed when ACR happens and forms precipitation. At 298 K, pH ≥ 10.6, ACR can take place, alkalinity which ACR needs increases as temperature rises. pH value of alkaline solution was detected when lithium hydroxide carbonate reaction may form lithium carbonate sediment. At 298 K, pH ≥ 13.1, lithium hydroxide carbonate reaction can produce lithium carbonate precipitation besides brucite and calcite, OH concentration which ACR needs does not basically change as temperature rises when forming lithium carbonate crystal.