Behaviour of a High-Antimony Concentrate (Tetrahedrite) in Flash Smelting Simulation Experiments

摘要

In the article the removal of sulfur and antimony from a tetrahedritic concentrate containing 25.4% Cu, 21.5% Fe, 20.5% S and 13.8% Sb was studied in a laboratory scale laminar flow furnace. The gas preheating temperatures were 500 -1100 C and the atmospheres were N2 and N2 with up to 50% O2 and up to 5% SO2. Two narrow particle size fractions were used with x = 20 -38 micrometers and x = 62 - 74 micrometers. Desulfurization was found to proceed continuously along with increasing gas preheating temperature and oxygen concentration. A minimum was, however, found in the antimony removal curve. Chemical and morphological analyses of the oxidation products and a thermodynamic approach to the prevailing reaction system was used to determine details of the reaction mechanisms in the flash oxidation of antimony bearing minerals.