Abstract
The dissolution kinetics and mechanisms of reaction of Udi clay in nitric acid have been studied. Leaching temperature, acid concentration, particle size, solid-to-liquid ratio, and stirring speed were selected as process parameters. It was observed that the dissolution rate increased with decreasing particle size and solid-to-liquid ratio and increased with stirring speed, acid concentration, and leaching temperature. The experimental results indicate that the dissolution rate is chemical reaction controlled via hydrogen ion [H+] action, with reaction order of 0.31 and the reaction kinetics can be expressed as: 1 – (1 – X) 1/3 = 1.7275 x 10 4 C [HNO3] 0.3113 (dp) -0.4102 (S/L) -0.3104 (w) 0.2709 exp (-2621/T) t. The activation energy of the process was determined to be 21.791kJ/mol. The experimental data were tested by graphical and statistical methods and it was found out that the above model best fitted the data.
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