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In this study the dissolution of Colemanite in aqueous acetic acid solutions was investigated in a batch reactor employing the parameters of particle size, solid-to-liquid ratio, and temperature. It was found that the dissolution rate increases with increasing temperature and decreasing solid-to-liquid ratio and particle size. The most effective parameter was particle size with a power of −1.420 after temperature and solid-to-liquid had less effect than the other parameters. The conversion rate increased up to 3.365 M acid concentration and then decreased with increasing acid concentration. No important effect of stirring speed was observed. The activation energy of the process was determined to be 51.490 kJ mol-1. It was determined by graphical and statistical methods that the reaction fits a model in the form of −ln(1 − X) = kt. The following semiempirical mathematical model, which expresses the process well, was established:  −ln(1 − X) = 56 664(D)-1.42(S/L)-0.270 exp(−6193.0/T)t, where X is the conversion fraction, D the particle size, S/L, the solid-to-liquid ratio, and T the reaction temperature.

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