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 Kmt=[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.