Efficient Bath-Smelting Reduction of Antimony Oxide in FeO-SiO2-CaO-Na2O Quaternary Slag with Low Melting Point
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An FeO-SiO2-CaO-Na2O quaternary slag with low melting point was developed for the bath-smelting reduction of Sb2O3. First, the optimum composition of the designed slag was determined through practical experiments to be 36.2% FeO, 31.9% SiO2, 12.0% CaO, and 20.0% Na2O, such that FeO/SiO2 was 1.14. The effects of the main variables influencing the yield and content of antimony in the smelting slag were investigated in detail for the content-optimized slag, and the following optimum smelting conditions were determined: smelting duration of 50 min, rate of coke, i.e., coke dosage of 12.5 wt.%, and smelting temperature of 1000°C. These conditions enabled high recovery of antimony, > 92.0%, and low antimony content in the slag of around 0.97%; the values of both these parameters are superior to those achieved by existing processes.
This project was supported financially by the National Nature Science Foundation of China (Grant No. 51604105) for which the authors are grateful. We also acknowledge the several helpful comments and suggestions from anonymous reviewers.
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