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Extraction of Iron and Manganese from Pyrolusite Absorption Residue by Ammonium Sulphate Roasting–Leaching Process

College of Architecture and Environment, Sichuan University, Chengdu 610065, China
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Metals 2018, 8(1), 38; https://doi.org/10.3390/met8010038
Received: 21 December 2017 / Revised: 31 December 2017 / Accepted: 5 January 2018 / Published: 8 January 2018
The residue from desulfurization and denitrification of exhaust gas treatment process with pyrolusite ore as absorbent is regarded as a potential source of iron and manganese. In this study, an extraction process is proposed for recovery of iron and manganese with ammonium sulphate roasting followed by sulphuric acid leaching. Firstly, the conversion mechanism was analyzed through mineral phase analysis of roasting products at different roasting temperature by means of X-ray diffraction (XRD) technology. Then, the parameters of the roasting procedure such as roasting temperature and time, ammonium sulphate dosage, leaching temperature, leaching time, and sulphuric acid concentration are examined. The results implicate that the iron oxide and manganese dioxide in the residue are firstly converted into the water-soluble ( NH 4 ) 3 Fe ( SO 4 ) 3 and ( NH 4 ) 2 Mn 2 ( SO 4 ) 3 at 200–350 °C, and then the more stable NH 4 Fe ( SO 4 ) 2 and MnSO 4 are formed, at temperature higher than 350 °C. Under optimum conditions, 95.2% Fe and 97.0% Mn can be extracted. Reactant diffusion through inert layer of silicon dioxide was considered as the rate-limiting step for iron extraction with an activation energy of 20.56 kJ/mol, while, the recovery process of Mn was controlled by both reactant diffusion and chemical reaction with an activation energy of 29.52 kJ/mol. View Full-Text
Keywords: pyrolusite absorption residue; recovery; iron; manganese; ammonium sulphate; roasting pyrolusite absorption residue; recovery; iron; manganese; ammonium sulphate; roasting
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Deng, L.; Qu, B.; Su, S.-J.; Ding, S.-L.; Sun, W.-Y. Extraction of Iron and Manganese from Pyrolusite Absorption Residue by Ammonium Sulphate Roasting–Leaching Process. Metals 2018, 8, 38.

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