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Novel Process of Reduction Roasting Manganese Ore with Sulfur Waste and Extraction of Mn by Acid Leaching. METALS 2022. [DOI: 10.3390/met12030384] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Manganese dioxide is typically reduced to a bivalent state before being extracted; here, sulfur is considered an efficient reductant and sulfur–based reduction has been industrialized in China. In this study, the reaction mechanism between MnO2 and gaseous sulfur was investigated. Thermodynamically, the reduction of MnO2 by gaseous sulfur is feasible. The predominant phase diagram as functions of temperature and input S2(g) fraction in the S2–MnO2 system was calculated. Experimental validation showed that MnO2 was reduced stepwise to low-valence manganese oxides and manganese sulfate. The phase composition of the roasted products was complex, and MnS was inevitably formed. The valence state as well as microstructure of manganese dioxide during reduction roasting were also investigated by X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy–energy-dispersive spectroscopy (SEM–EDS). The reaction process could be described by an unreacted nuclear model. Manganese was extracted by sulfuric acid solution after reduction by sulfur waste. In sulfuric acid, 95.2 wt% Mn extraction was achieved, using a roasting temperature of 450 °C, roasting time of 30 min, and S2/MnO2 molar ratio of 0.40. With the same conditions, low Fe extraction was achieved. On the other hand, in deionized water, 24.3 wt% Mn extraction was achieved, confirming the formation of MnSO4.
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Ji T, Yang B, Su SJ, Ding S, Sun WY. Leaching characteristics and kinetics of iron and manganese from iron-rich pyrolusite slag in oxalic acid solution. SEP SCI TECHNOL 2021. [DOI: 10.1080/01496395.2020.1786700] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Tao Ji
- Department of Environmental Science and Engineering, College of Architecture and Environment, Sichuan University, Chengdu, China
| | - Bo Yang
- Department of Environmental Science and Engineering, College of Architecture and Environment, Sichuan University, Chengdu, China
| | - Shi-jun Su
- Department of Environmental Science and Engineering, College of Architecture and Environment, Sichuan University, Chengdu, China
| | - Sanglan Ding
- Department of Environmental Science and Engineering, College of Architecture and Environment, Sichuan University, Chengdu, China
| | - Wei-yi Sun
- Department of Environmental Science and Engineering, College of Architecture and Environment, Sichuan University, Chengdu, China
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Efficient enrichment of low-grade refractory rhodochrosite by preconcentration-neutral suspension roasting-magnetic separation process. POWDER TECHNOL 2020. [DOI: 10.1016/j.powtec.2019.11.082] [Citation(s) in RCA: 50] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Jin J, Han Y, Li H, Huai Y, Peng Y, Gu X, Yang W. Mineral phase and structure changes during roasting of fine-grained carbonaceous gold ores and their effects on gold leaching efficiency. Chin J Chem Eng 2019. [DOI: 10.1016/j.cjche.2018.08.006] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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