Leaching kinetics of polydisperse particles of different shapes

Abstract

Leaching – extraction of one or more components from solid bodies (ores, concentrates, intermediate products, production waste) with an aqueous solution containing alkali, acid or other reagent. Usually, leaching is accompanied by a chemical reaction, as a result of which the extracted component changes from a water-insoluble form to a soluble one. At the end of leaching, in contrast to dissolution, a solid phase always remains, that is, the degree of leaching is less than 100 %. As a rule, crushed material of different granulometric composition is received for leaching. In the process of leaching, the surface of such material changes, which, together with a decrease in the concentration of reagents and the accumulation of products, leads to a decrease in the rate of leaching.