CaCl_2-Ca(OH)_2-H_2O体系中氢氧化钙的平衡浓度  

Equilibrium concentration of calcium hydroxide in CaCl_2-Ca(OH)_2-H_2O system

作　　者：刘卫平[1] 徐徽[1] 石西昌[1] 杨喜云[1] 陈亚[1] 程俊峰[1] 李贵[1] 

机构地区：[1]中南大学冶金科学与工程学院,长沙410083

出　　处：《中国有色金属学报》2012年第9期2656-2661,共6页The Chinese Journal of Nonferrous Metals

基　　金：国家科技支撑计划"十一五"重大项目(2008BAB35B04);中央专项中南大学前沿研究计划重点项目(2010QZZD003)

摘　　要：绘制了25℃时CaCl2-Ca(OH)2-H2O体系的c(CaCl2)—c(Ca(OH)2)图和c(CaCl2)—pH值图。结果表明:体系中c(Ca(OH)2)和pH值随着c(CaCl2)的增加而不断减小,c(Ca(OH)2)变化趋势与Debye-Huckel计算值相符,当c(CaCl2)<3.78 mol/L时,体系pH值>10.4。当c(CaCl2)>2.57mol/L时,有沉淀物CaClOH生成。经计算,理论上CaCl2母液可以循环配制石灰水132次,研究结果为石灰水法制备氢氧化镁工艺中CaCl2母液循环配制石灰水提供了一定的理论依据。The c（CaCl2）-c（Ca（OH）2） chart and c（CaCl2）-pH value chart in CaC12-Ca（OH）2-H2O system under 25 ℃ were plotted. The results represent that c（Ca（OH）2） and pH value decrease with the increase of c（CaCl2）, the trend of c（Ca（OH）2） is supported by the calculation results of Debye-Huckel. When c（CaC12）〈3.78 mol/L, the pH value of the system is bigger than 10.4, and CaClOH is preciptated while c（CaCl2）〉2.57 mol/L. Through calculation, the CaCl2 mother liquor can reuse 132 times for collocating lime water in theory. The research results provide a theoretical basis for the treatment and reuse of calcium chloride mother liquor for collocating lime water which is the precipitant in the process of synthesizing magnesium hydroxide.

关 键 词：CaCl2-Ca(OH)2-H2O 石灰水 CaCl2母液 pH值 循环 

分 类 号：TF111.3[冶金工程—冶金物理化学]