A new mathematical model was developed for leaching of zinc ores containing silicates
such as hemimorphite which produce a gel during leaching with sulfuric acid. This model is
based on the shrinking core model in which the particle size and the reacting core shrink
simultaneously. It was shown that the actual dissolution time of the ore particles is longer
than the time corresponding to the dissolution of chemical zinc oxide itself. It was suggested
that because of the existence of silicates in the ore, a gelatinous layer was formed around …