浓碱高苛性比铝酸钠溶液中水合铝硅酸钠形成的动力学研究

The Kinetics of the Formation of Sodium Aluminosilicate Hydrate in Strong Caustic Solutions

研究了浓碱高苛性比铝酸钠溶液中水合铝硅酸钠形成的动力学行为 ,反应对 Al(OH) - 4 、Si O2 (OH) 2 - 2 均为一级反应 .结合溶液的结构和沸石形成机理 ,提出了五配位中间体形成机理 ;提高反应温度、降低碱浓度、加强搅拌或加入晶种 (或杂质 )均有利于水合铝硅酸钠的形成 .

The kinetics of the formation of sodium aluminosilicate hydrate in strong caustic solutions at high mole ratio(between Na\-2O and Al\-2O\-3) were studied. It was one order for \{Al(OH)\+-\-4\} and SiO\-2(OH)\+\{2-\}\-2 ion respectively. The value of apparent active energy was 86.42 \{kJ/mol\}. Based on the analysis of the structure of the aluminate solution and the mechanism of the formation of zeolite, the mechanism of five\|ligand intermediate state was set up. It was advantageous for the formation of sodium aluminosilicate hydrate to increase the temperature, or to decrease the caustic concentration, or to intensify the agitation, or to add the seed(or impurities) in the alumina production.