【作者】 翟坤明； 马家玉； 李志宝； 密建国；

【Author】 Zhai Kunming~1,Ma Jiayu~2,Li Zhibao~(2*),Mi Jianguo~1(1.Beijing University of Chemical Technology,Beijing 100029, China;2.Institute of Process Engineering.Chinese Academy of Sciences,Beijing 100190,China)

【机构】 北京化工大学化工学院； 中国科学院过程工程研究所；

【摘要】 要研究了二水硫酸钙对含硅的铝酸钠溶液脱硅动力学的影响。在90℃、苛性比（Na₂O和Al₂O₃的摩尔比）2.55、搅拌速度200r/min、二水硫酸钙用量40g/L、氢氧化钠浓度300g/L条件下脱硅460min后,溶液中约90%的硅被脱除。并用三参数指数方程y=aexp（-bx）+c关联了铝酸钠溶液中二氧化硅的浓度随时间的变化,建立了脱硅动力学及晶体增长动力学模型,得到二水硫酸钙脱硅反应级数为一级,晶体增长速率常数为10^5.34m/s。通过XRD分析知脱硅产物主要成份为水化石榴石。更多还原

【Abstract】 The effect of desilication kinetics of silicate-containing sodium aluminate solution with calcium sulfate dihydrate was studied.Under the condition of 90℃,α_k=2.55,stirring speed of 200r/min,CaSO₄·2H₂O dosage of 40 g/L and NaOH=300 g/L, about 90%silica from sodium aluminate solution was removed. The exponential equation with three parameters was used for correlating the relation between the concentration of SiO₂ and desilication time and the models of the desihcation kinetics and crystal growth were established.The order of desilication reaction was one and crystal growth rate constant was 10^5.34 m/s.In addition, the desilication product was mainly hydrogamet,identified by XRD.更多还原