Recovery of valuable metals from jarosite by sulphuric acid roasting using microwave and water leaching |
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| Authors: | C Liu L B Zhang C Srinivasakannan J H Peng T Q X Le |
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| Affiliation: | 1. Yunnan Provincial Key Laboratory of Intensification Metallurgy, Kunming, Yunnan 650093, China;2. National Local Joint Laboratory of Engineering Application of Microwave Energy and Equipment Technology, Kunming, Yunnan 650093, China;3. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China;4. Chemical Engineering Program, Petroleum Institute (UAE), Abu Dhabi, United Arab Emirates |
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| Abstract: | In this paper, jarosite residue (JR) blended with concentrated H2SO4 was subjected to a process comprising microwave roasting and water leaching. The effects of H2SO4/JR weight ratio, microwave roasting temperature and time, water leaching conditions on the recovery of Fe, Zn, In, Cu, Cd, Ag and Pb were investigated utilising a series of experiments.Based on energy conservation and environmental protection, optimum conditions for metals recovery from JR were determined as: H2SO4/JR weight ratio?=?0.36, microwave roasting temperature, 250°C; roasting time, 30?min; leaching temperature, 50°C; leaching time, 1?h; and liquid–solid ratio, 4:1 (mL/g), thus, the extraction of Fe, Zn, In, Cu, Ag and Cd were 89.4, 80.7, 85.1, 90.7, 61.3 and 48.8% respectively, while the Pb was concentrated in the final residue. Scanning electron microscope-energy dispersive spectrometer (SEM-EDS) patterns were used to characterise and analyse the transformation of valuable metals in the residue after roasting and leaching. |
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| Keywords: | Jarosite residue Microwave Sulphuric acid roasting Valuable metals |
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