METHOD OF TREATING PYRITE BEARING POLYMETALLIC MATERIAL

摘要

A method of treating pyrite bearing polymetallic material comprising heating the material in the atmosphere of reducing gases at a temperature of 450 to 500.degree.C for a period of 30 to 60 min. Gases such as hydrogen, or products of conversion of natural gas or mazut can be used to provide the reducing atmosphere. The roasted copper-containing material is cooled at a rate of 2 to 4 deg. per min and is then subjected to magnetic separation. The operation of magnetic separation is carried out in two stages with the intensity of magnetic field ranging from 1000 to 2000 oersted, whereafter copper sulphides are removed from the roast, with the magnetic field intensity ranging from 4500 to 6000 oersted.