Abstract
Reduction smelting forming a soda base slag by addition of sodium salt is applied to the extraction of oxide ore or smelter recycles. To get a fundamental data on the reduction smelting of antimony, Na2O-SiO2 or FeOn-Na2O slag was equilibrated with metallic antimony containing small amount of impurities such as Fe, As, Sn, Pb, Cu at 1423 K. Dependences of the antimony solubility in slag and the distribution ratios of impurities upon oxygen potential and slag composition were clarified.The solubility of antimony in slag increases with increase of oxygen potential and the soda-ratio of nNa2O/(nNa2O+nSiO2). The activity coefficient of SbO1, 5 (1) in the basic slag of high soda-ratio varies from 1 to 0.001 depending on oxygen potential.Iron and arsenic are removable from crude antimony to soda base slag by control of oxygen potential and slag composition. While the acidic slag of low soda-ratio is suitable for removal of iron, the basic slag of high soda-ratio is effective to eliminate arsenic from crude antimony.
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