ABSTRACT
A more convenient way would be to add to the sulfide a reagent that has a strong affinity for H2S. Calcium oxide fulfills such a requirement; it reacts readily with H2S to form CaS. Separation of CaS from the reaction product was achieved by pelletization of chalcopyrite before reduction. When reduction was conducted at high CaO addition the pellets retained their form after reduction but were greatly swollen due to the formation of metallic whiskers. They were composed mainly of copper, iron and the gangue minerals. Due to the presence of metallic iron they are magnetic and can be separated by a magnet.
