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对安徽官山地区沉积型、热液型坡缕石进行碱性溶液中水解作用的动力学实验研究。结果表明:沉积型坡缕石较热液型更耐碱,且两种坡缕石均存在明显的差异溶解现象,即四面体硅的溶解速率要略大于八面体铝阳离子的溶解速率。碱溶液中沉积型、热液型坡缕石水解动力学均适宜采用圆柱体扩散控制模型模拟,其浸出率x对反应时间t的关系可表示为(1-x)+xlnx=kt。在实验条件下沉积型坡缕石水解过程中,A l3+和Si4+反应表观活化能分别为18.16 kJ/mol和18.53 kJ/mol。热液型坡缕石水解过程中,A l3+和Si4+反应表观活化能分别为31.2 kJ/mol和32.95 kJ/mol。
Kinetics experiment on the hydrolysis of sedimentary and hydrothermal palygorskite in Guanshan area in alkaline solution. The results show that the depositional palygorskite is more alkali-resistant than the hydrothermal solution, and both of the two palygorskites have obvious dissolution phenomena. That is to say, the dissolution rate of tetrahedral silicon is slightly greater than the dissolution rate of octahedral aluminum cations. Hydrolytic kinetics of depositional and hydrothermal palygorskite in alkali solution are all suitable to be simulated by cylinder diffusion control model. The relationship between leaching rate x and reaction time t can be expressed as (1-x) + xlnx = kt. Under the experimental conditions, the apparent activation energy of the reaction between Al 3+ and Si 4+ was 18.16 kJ / mol and 18.53 kJ / mol, respectively. During hydrothermal palygorskite hydrolysis, the apparent activation energies of A l3 + and Si4 + reaction were 31.2 kJ / mol and 32.95 kJ / mol, respectively.