PROCESS OF LEACHING A LATERITIC ORE FOR PREPARING METAL EXTRACTION

摘要

The starting material is lateritic ore which contains nickeloxide and/or cobalt oxide. From water and comminuted ore, ofwhich at least 80 wt-% have grain sizes of not more than 0.5mm, a pumpable suspension is formed. The ore-containing sus-pension is passed through an indirectly heated preheatingtube, the suspension being heated to 150 to 250°C. The heatedsuspension is passed through a mixing line in which an acidin a minimum amount of 10 kg per 100 kg ore, calculated anhy-drous, is admixed to the suspension, and the acid-containingsuspension is passed through a dwell time tube in which thedwell time of the suspension is at least 0.1 minutes. Pref-erably, sulfuric acid is introduced into the mixing line.