The materials of mass transfer kinetic analysis of complicated by the establishment of adsorption equilibrium, during alumina liquor precipitation of alumina production. It is shown that the presence of strongly adsorbing impurities is one of the determinants of the intensity of the aluminum hydroxide chemical precipitation. The results of experimental studies on the alumina liquor precipitation with the participation of adsorption active components.
The materials of the pilot study, which establishes the dependence of the kinetics of mass crystallization of aluminum hydroxide on the extent of metastable alkaline aluminate solutions. Shown that changes in the level of metastability of the environment of crystallization is the lag in time from changes in state parameters of physico-chemical system. The theoretical a justification of the transition from one level of the metastable state to another due to time constraints, changing the structure of unstable solutions.
The materials of experimental research on alumina liquor precipitation kinetics in system Na 2 O – K 2 O – Al 2 O 3 – H 2 O using carbonated alumina hydroxide as a seed are presented. Particle size distribution (PSD) analyses of settling products are given. Correlation link of alumina liquor decomposition degree and average median diameter of received aluminum hydroxide are shown.
