THERMODYNAMICS AND KINETICS STUDIES OF ALUMINA LEACHING FROM KARAWORO CLAY USING OXALIC ACID SOLUTIONS
Publication Date : 01/03/2018
The leaching kinetics and mechanisms of reaction of Karaworo clay in oxalic acid was studied. Calcination temperature, leaching temperature, acid concentration, particle size and solid-to-acid ratio was selected as process parameters. It was observed that the dissolution rate increased with a decrease in particle size and solid-to-acid ratio, but increased with an increase in leaching temperature and acid concentration. The experimental results indicate that for dissolution rate chemical reaction controlled in hydrogen ion [H+] medium with reaction order of (0.32 ), the reaction kinetics can be expressed as: 1-(1-X)1/3 = 1.7275x 104 C (H2C2O4) 0.3113 dp -0.4102 (S/L) -0.3104 (W) 0.2709has exp (-2621/T) t. The activation energy of the process was determined to be 21.791kJ/mol. The experimental data was tested by graphical and statistical methods and it was observed that the above model best fitted the data.
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