A process for removing impurities from copper concentrate prior to smelting
is presented here. The concentrate is subjected to thermal decomposition i
n a vacuum chamber at temperatures of about 950 degrees C. This pretreatmen
t allows the complete removal of arsenic, antimony, bismuth, lead, zinc, as
well as of other impurities from the copper concentrate. (C) 1999 Publishe
d by Elsevier Science Ltd. All rights reserved.