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Spectral dimension during the precipitation of gibbsite from the seeded caustic aluminate solutions

The kinetics of the second order reaction on fractals was used to study the precipitation of the seeded caustic aluminate solutions. The spectral dimensions of the precipitation reaction of aluminate sodium liquor when washed seeds and sodium containing seeds were determined. The results prove that the rate constant k t is correlated with time, as k t=kt d s/2-1 . The rates of the precipitation of aluminate sodium liquor with washed seeds at the beginning are faster than that of the sodium containing seeds. Experiment results show the precipitation rate can be activated by washed seeds and unactivated by sodium containing seeds at the beginning, which is in accordance with the spectral dimensions.