Process and apparatus for hydrometallurgical treatment of metallurgical dust and the application of this process and apparatus to blast furnace flue dust

摘要

Method and device for hydrometallurgical treatment of metallurgical dust by acid leaching followed by solid-liquid separation. The invention is characterized in that the leaching phase (1) takes place by moderate acid attack (end of reaction pH close to 4 or 5) and in that an additional separation step (2) is carried out solid-solid either, according to the figure, before the operation (3.3 ′) of solid-liquid separation, or near. The invention applies to all dust from metal treatments, in particular steel dust and, in particular, that of blast furnaces, of which it allows the separation and recovery of the useful elements contained therein, such as iron, zinc and lead.