氢氧化铝在苛性碱中溶解动力学研究  

Study on dissolution kinetics of the aluminium hydroxide in the caustic soda

作　　者：孟令利 

机构地区：[1]中国铝业山东分公司研究院,山东淄博255061

出　　处：《轻金属》2012年第9期23-27,共5页Light Metals

摘　　要：实验研究了氢氧化铝在苛性碱中溶解的表观动力学方程,在氢氧化铝溶解过程中存在着一对可逆过程,最终建立两相平衡体系。从动力学方程推测了氢氧化铝在苛性碱中溶解的机理,在溶解过程中没有发生化学反应。仅是氢氧化铝晶体的氢键断裂。氧化铝在苛性碱溶液中以Al(OH)3单分子形态存在。在溶解结束或者种分过程结束时,在苛性碱溶液中,液相中的Al(OH)3与固相通过氢键的生成或断裂构成的两相吸附平衡。实验得到了在平衡状态下,液相中氧化铝的平衡浓度与苛性碱浓度、温度以及固相量的关系,与经验公式数值吻合较好。During the aluminium hydroxide dissolution, there is a pair of reversible processes, finally the equilibrium system between two phases is found. The apparem kinetics equation of the aluminium hydroxide in the caustic soda was studied in the laboratory, and the dissolution mechanism of the aluminium hydroxide in the caustic soda was inferred. There were no chemical reactions, hydrogen bonds of aluminium crystals ruptured during the dissolution process, and the alumina existed in the aluminium hydroxide in the form of single molecule of A1 （OH） 3. By the end of dissolution or seed precipitation, equilibrium between the liquid phase and the solid phase was formed by generation and rupturing of hydrogen bonds. Under the equilibrium condition, some numerical values were coincided with numerical values of the empirical formula, such as equilibrium concentration of alumina and caustic soda in the liquid phase and the relationship between the temperature and solid content.

关 键 词：氢氧化铝 溶解度 氢键 两相平衡 动力学 

分 类 号：TF821[冶金工程—有色金属冶金]