Förfarande för att förbättra kvaliteten på kopparslig

摘要

The invention relates to a method for the preparation of a copper concentrate suitable for pyrometallurgical treatment from a concentrate in which zinc is present as an impurity. In accordance with the method, zinc is leached from the concentrate with a solution containing sulphuric acid in oxidising conditions at atmospheric temperature and pressure. At the end of the leach, the conditions are regulated to be such that any copper that may have dissolved will be precipitated.