In this work, the effect of temperature on the magnetic reduction roasting - magnetic separation of Fe-Mn ore was investigated firstly. Then the reduction behaviors of MnO2-Fe2O3 system and MnO2-Fe2O3-10 wt.% SiO2 system under 10 vol.% CO-90 vol.% CO2 at 600-1000 degrees C were investigated by XRD, XPS, SEM-EDS, VSM, DSC and thermodynamics ...
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DOI: 10.1016/J.APT.2018.11.006 Corpus ID: 105564100; A further investigation on the MnO2-Fe2O3 system roasted under CO-CO2 atmosphere @article{Bingbing2019AFI, title={A further investigation on the MnO2-Fe2O3 system roasted under CO-CO2 atmosphere}, author={Liu Bingbing and Yuanbo Zhang and Wang Jia and Wang Juan and Su Zijian and Guanghui Li …
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During the reductive roasting process, MnSO 4 as well as gaseous SO 2 were simultaneously generated. The reaction between MnS and Mn 3 O 4 occurred at temperatures …
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During the reduction and roasting process, the valence state of manganese in ore ranges from high to low state: MnO2 → Mn2O3 → Mn3O4 → MnO. The overall reaction for the process can be written as: Cn H y O 2 + MnO 2 → CO 2 + …
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Compared to traditional roasting, the proposed microwave-enhanced roasting process benefits from the superior kinetic conditions provided by the synergy between microwave enhancement and compact ...
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In this study, the reaction mechanism between MnO 2 and gaseous sulfur was investigated. Thermodynamically, the reduction of MnO 2 by gaseous sulfur is feasible. The predominant phase diagram as functions of temperature and input S 2 (g) fraction in the S 2 …
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The experimental validation for reduction roasting and H2SO4 leaching revealed that 98.2% of the extracted Mn was obtained when the mixture (Fe–P: MnO2 ore = 5:100, m/m) was roasted at 500 °C ...
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To understand the reduction process of MnO 2 by CH 4-H 2 gas mixture, the effects of various CH 4/(CH 4 +H 2) molar ratios ... 99.99 vol.%. A reduction-roasting experiment was
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The reduction kinetics of oolitic hematite at 1173–1473 K is investigated by the microwave direct reduction. The effects of reduction temperature and time on the reduction of oolitic hematite are investigated in terms of FeO concentration in metalised pellets. The reduced samples are characterised by XRD, SEM and EDS. The results indicate that the degree of …
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However, the main problems with the reduction roasting process are the low efficiency of recovery of Mn, high investment, intensive energy consumption and operating cost and CO 2, SO x, a great ...
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The mechanism involved in the phase transformation process of pyrolusite (MnO2) during roasting in a reducing atmosphere was systematically elucidated in this study, with the …
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The recovery of antimony from high arsenic-bearing flue dusts was carried out by a selective oxidation roasting process using MnO2, in which the arsenic was removed through a volatilization and ...
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An alternative process, viz., the reduction roasting of manganese oxide ore with elemental sulfur prior to acid leaching, has been successfully developed [11, 24,25]. Sulfur-based reduction has ...
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The experimental validation for sulfation roasting and water leaching revealed that 90.6% of manganese and only 3.5% of iron were extracted when sulfation roasting was conducted at 500 °C for 60 min with SO 2 partial pressure (SO 2 / (SO 2 + N 2)) of 0.5%–1.0% (Vol.), and the leaching process was performed at 50 °C for 15 min with liquid-to ...
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The major disadvantage of the reduction roasting process is the intensive energy consumption, high investment and operating costs as well as the occasional release of harmful gases. The hydrometallurgical reductive leaching method possesses the advantages of energy conservation and one-step leaching process. The reducing agents used for ...
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Reduction roasting-acid leaching process was utilized to process high-iron-content manganese oxide ore using black charcoal as reductant. The results indicate that, compared with the traditional reductant of anthracite, higher manganese extraction efficiency is achieved at lower roasting temperature and shorter residence time. The effects of roasting parameters on the …
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DOI: 10.1016/J.APT.2017.05.023 Corpus ID: 136042803; Investigations on the MnO2-Fe2O3 system roasted in air atmosphere @article{Bingbing2017InvestigationsOT, title={Investigations on the MnO2-Fe2O3 system roasted in air atmosphere}, author={Liu Bingbing and Yuanbo Zhang and Wang Juan and Manman Lu and Zhiwei Peng and Guanghui Li and Tao Jiang}, …
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To understand the reduction process of MnO 2 by CH 4-H 2 gas mixture, the effects of various CH 4 /(CH 4 + H 2) molar ratios (0–1) and temperatures (1100°C–1250°C) on the …
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It is very important to selectively reduce manganese oxide over iron oxide for extraction of Mn from iron-rich manganese ore. In this study, reductive roasting of an iron-rich manganese oxide...
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This work investigated the phase transformation of MnO2 and Fe2O3 system roasted at 500–1400 °C in air atmosphere to understand the formation process of manganese ferrite. ... The reduction of ...
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The experimental validation for reduction roasting and H 2 SO 4 leaching revealed that 98.2% of the extracted Mn was obtained when the mixture (Fe–P: MnO 2 ore = 5:100, m/m) was roasted at 500 °C for 5 h and the leaching process was performed using 2-mol/L H 2 SO 4 at 70 °C for 30 min with a liquid-to-solid ratio of 10 and a stirring rate ...
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The kinetics of the reduction of MnO 2 by Fe 2+ ions in H 2 SO 4 solution were investigated under well-defined hydrodynamic conditions. The reaction was monitored potentiometrically using a saturated calomel electrode and a Pt electrode. The effect of stirring rate, particle size, temperature, Fe 2+ and H + concentrations were studied. Under high …
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Another innovative technique explored is the pyrolysis reduction roasting process using sawdust as a reducing agent. This method allows for the extraction of manganese from low-grade pyrolusite by ...
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Semantic Scholar extracted view of "Cleaner extraction of vanadium from vanadium-chromium slag based on MnO2 roasting and manganese recycle" by Jing Wen et al. Skip to search form Skip to ... The HIsmelt smelting reduction process is an efficient direct reduction process for smelting vanadium titanomagnetite ores. About 80% vanadium is …
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Reduction roasting of manganese ores is a known process; however, it is not yet commercialized mainly due to various techno-economic issues. The current research work presents results of a large ...
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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.
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Since MnO 2 is stable in direct acid or alkali dissolution, the possible reduction of the insoluble tetravalent manganese (IV) to soluble bivalent manganese (II) is necessary to …
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In this study, a novel reduction method for MnO 2 ore was developed using Fe P slag as the reductant. MnO 2 ore can be adequately reduced by Fe P slag, and the product of …
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