A method for enhancing the dissolution of a sulfide concentrate

摘要

The invention relates to a method for improving the leaching of a sulphidic concentrate that contains valuable metals in a hydrometallurgical fabrication process of said valuable metal. The purpose is to accelerate the oxidation of sulphidic sulphur during leaching and thus the dissolving of the valuable metal. In order to achieve this, at least some of the solution formed in leaching containing divalent iron is oxidised in a separate, tube-like oxidation reactor equipped with static mixers to form trivalent iron. The invention is particularly suitable for the hydrometallurgical fabrication method of zinc, in which the raw material is zinc concentrate and the zinc concentrate is leached directly without roasting.