Abstract
This study explored a highly selective and efficient oxidation system for the recovery of rhenium resources from Re-rich arsenic sulfide slag containing significant quantities of arsenic. The effects of H2O2 dosage, initial H2SO4 concentration and leaching temperature on the Re, As and Bi extraction efficiency were investigated in detail. The results demonstrated that under the most favorable conditions of 20 mL H2O2, 70°C, 0.25 mol L−1 H2SO4 solution, the Re extraction efficiency can reach 99.2%. The phase transitions of the main constituents of the slag, Re, As and Bi were analyzed. ReS2 and Re2S7 in the Re-rich arsenic sulfide slag were transformed to ReO4−, impelling Re to enter the leachate. Bi and As were oxidized and entered the leachate in ionic form under a limited H2O2 dosage. As the H2O2 dosage increased, the concentration of Bi and As in the leachate reached a threshold value and transformed to stable BiAsO4, resulting in the attenuation of As and Bi extraction efficiency. This process considerably promoted the selective leaching of Re and the separation of Re from As and Bi. Kinetic analysis shows that the leaching process is controlled by chemical reaction with an apparent activation energy of 29.05 kJ mol−1.
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This work was supported by the National Natural Science Foundation of China (No. 51874257).
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Zhang, J., Feng, W., Cao, H. et al. Recovery of Re from Re-Rich Arsenic Sulfide Slag by Oxidative Leaching: Thermodynamic and Kinetic Mechanism Studies. JOM 75, 4910–4921 (2023). https://doi.org/10.1007/s11837-023-06101-0
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DOI: https://doi.org/10.1007/s11837-023-06101-0