Abstract

The dissolution kinetics and mechanisms of reaction of Batagbon Kaolin in sulphuric and fluosilicic acids were studied. Leaching temperature, acid concentration, particle size, solid-to-liquid ratio, and stirring speed were selected as process parameters. It is observed that the dissolution rate increases with decreasing particle size and solid-to-liquid ratio, and increases with stirring speed, acid concentration, and leaching temperature. The experimental results indicate that the dissolution rate is of mixed control via hydrogen ion [H+] action, with reaction order of 0.813 and the reaction kinetics can be expressed as K m t=[1-(1-x)1/3+y/6[(1-x)1/3+ 1-2(1-x)2/3]. The activation energy of the process is determined to be 21.6 kJ/mol. The level of the product quality is also evaluated.

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