Abstract
Results obtained in a kinetic study of nonoxidative leaching of cinnabar ore in aqueous hydrochloric acid-potassium iodide solutions and the basic reactions in a new process of cinnabar treatment for obtaining mercury are presented. Experiments were performed at stirring speeds fast enough to eliminate the effect of this variable in the overall reaction rate. Under these experimental conditions the dissolution rate appears to be controlled by chemical reaction on the cinnabar surface. An activation energy of 42.3 kJ/mole was found. The dissolution rate is of the first order with respect to hydrochloric acid activity and of second order with respect to potassium iodide activity. The reaction rate in the different leaching conditions was established through weight loss of very pure cinnabar spheres submerged in the attack solution for known periods of time.
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