Leaching kinetics of Chevreul's salt in ammonium chloride

The study investigated the leaching kinetics of Chevreul's salt in ammonium chloride solutions by mechanical agitation

experimental system. Reaction temperature, the concentration of ammonium chloride, stirring speed, and the solid-liquid

ratio were selected as parameters. Experimental results were correlated using linear regression implemented in the

statistical package program. The effect of parameters on Chevreul salt solubility was examined, and integrated rate

expression of dissolution rate was found using kinetic models in solid-liquid heterogeneous reactions. The results

revealed that the dissolution rate of Chevreul's salt decreased. At the same time, reaction temperature, concentration of

ammonium chloride and stirring speed increased while dissolution rate decreased with the increase of the solid-liquid

ratio. Based on the result of the applications of the obtained experimental results to the kinetic models, we can deduce

that Chevreul's salt dissolution rate is controlled by diffusion through the ash (or product) layer. The activation energy

of the dissolution reaction was 17.83 kJ/mol. The integrated rate expression, along with the effects of parameters on

Chevreul's salt solubility, was found to be as follows:

1 - 3(1-X)2/3 + 2(1-X) = [2,96.1013.(CA)3,08 .(S/L)-0,38.(W)1,23 e -9001,2 / T ] . t