Sulfation roasting followed by water leaching has been proposed as an alternative route for recycling valuable metals from spent lithium-ion batteries (LIBs). In the present work, the reaction mechanism of the sulfation roasting of synthetic LiCoO2 was investigated by both thermodynamic calculations and roasting experiments under …
With the growth of the new energy industry, the requirements for manganese have increased significantly. In this paper, the method of manganese extraction from pyrolusite using ammonium sulfate roasting and water leaching was presented. At the optimal process parameters: mass ratio of (NH 4) 2 SO 4 to pyrolusite of 2:1, the …
In this regard, two processes are followed viz. reduction roasting followed by leaching and reductive leaching. 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.
Although calcination/roasting behavior of Mn ores/oxides was previously investigated, the studies were mostly about roasting in reducing atmosphere e.g. in CO gas. Furthermore, there is no significant research on the onset temperature of the reactions in the heating process, where several side-phases are simultaneously involved in the …
To understand the reduction process of MnO2 by CH4-H2 gas mixture, the effects of various CH4/ (CH4 + H2) molar ratios (0–1) and temperatures (1100°C–1250°C) on the reduction of pure MnO2 ...
A fresh thinking based on selective oxidation-reduction roasting was proposed to recover vanadium and manganese from vanadium slag (VS) and low-grade pyrolusite (LGP) simultaneously.
The results showed that the grinding and addition of the catalyst have a significant effect on lowering the MnO2 reduction temperature independently.
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 …
Semantic Scholar extracted view of "Extraction of tungsten and molybdenum from waste alloy assisted by a recyclable roasting additive: β-MnO2" by Yuanyuan Cai et al.
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 S 2 /MnO 2 molar ratio of 0.40.
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].
Iron and manganese both are important ferrous metals, and they usually need to be extracted separately for better usage. Ferromanganese ore from the Yunnan Province of China was investigated by subjecting it to reduction roasting, leaching, magnetic separation, hydrometallurgical separation process, X-ray diffraction (XRD), …
In this work, a novel method for extraction of manganese from low-grade pyrolusite by a sawdust pyrolysis reduction roasting-acid leaching process was explored. ... Extraction of manganese from iron rich MnO2 ores via selective sulfation roasting with SO2 followed by water leaching.
Study in reduction-roast leaching manganese from low-grade manganese dioxide ores using cornstalk as reductant
A recovery efficiency for chemical MnO2 of 36.6% was obtained via preparation from Pb-removed EMAS through the "roasting-pickling disproportionation" process, with an acid washing time of 100 min ...
Download Citation | On Nov 22, 2021, Yong Yang and others published Enhanced Leaching of Mn from Electrolytic Manganese Anode Slime via an Electric Field | Find, read and cite all the research you ...
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.
Request PDF | On Jul 1, 2023, Zhixing Wang and others published Preparation and characterization of MnFe2O4 by a microwave-assisted oxidative roasting process | Find, read and cite all the ...
In this study, a promising process has been developed for selective recovery of valuable metals from spent lithium ion batteries (LIBs). First, reduction roasting which used spent anode powder as reduction agent and water immersion are applied to preferentially recover lithium. Subsequently, an ammo …
In this study, an extraction process is proposed for recovery of iron and manganese with ammonium sulphate roasting followed by sulphuric acid leaching.
A study on separation of Mn and Fe from high-alumina ferruginous manganese ores by the carbothermal roasting reduction process
In this study, a modified sulfation-roasting-leaching process was performed at a lower temperature than the traditional sulfation roasting technique to recover selenium, copper, and silver from the copper anode slimes.
Reduction roasting of manganese ores is a known process; however, it is not yet commercialized mainly due to various techno-economic issues.
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.
Semantic Scholar extracted view of "Efficient enrichment of low-grade refractory rhodochrosite by preconcentration-neutral suspension roasting-magnetic separation process" by Shuai Yuan et al.
Simple and environment-friendly recovery of valuable metals from spent LIBs was explored. The experimental method, which included reduction roasting and hydrometallurgical recovery, is called a quasi-reversible process. The principle behind the quasi-reversible model could be used to assess the energy consumed during the …
Current reduction technologies employed for pyrolusite include roasting-acid leaching and direct reductive leaching utilizing various acids and reducing agents [ 3, 4 ]. The roasting method is limited due to the generation of noxious gases and high energy consumption, making the direct reductive leaching route more commonly preferred [ 6 ].
At <= 198 K, the presence of MnO2 promoted the reduction of Fe2O3 and the catastrophic swelling resulted from the formation of both metallic iron plates and whiskers was observed.
This study further investigated the MnO2-Fe2O3 system roasted under CO-CO2 atmosphere. Extensive investigations were concentrated on the reduction of simplex iron oxides or manganese oxides, and ...
MnO2 roasting was proposed as a suitable roasting method for vanadium extraction from vanadium-chromium slag (V–Cr slag). Acid leaching and vanadium p…
Semantic Scholar extracted view of "Synthesis and magnetism property of manganese ferrite MnFe2O4 by selective reduction and oxidization roasting process" by Lihua Gao et al.
The chemical composition of vanadium slag significantly affects its element distribution and phase composition, which affect the subsequent calcification roasting process and vanadium recovery.
The reduction temperature is relatively high (850-900°C). In this study, a kind of biomass, pine black charcoal, was used as a reductant to reduce low-grade manganese oxide ores.
The effect of β-MnO2 as a roasting additive on the phase evolution of Mo, W, and Mn elements and the optimal process conditions were evaluated by XRD, SEM-EDS, thermal analysis, and alkali ...
The thermodynamic simulation of the reaction in the roasting process was carried out by using HSC 6.0 software (Finland). The relationship between G and the reduction temperature of the pyrolusite ...
The reduction of MnO2, Fe2O3, Fe3O4 and MnFe2O4 were compared by TG and thermodynamic analyses. In addition, the morphology evolution and magnetism change of the MnO2-Fe2O3 system reduced under ...
Although roasting temperature is the most crucial factor for maintaining high Mn reduction efficiency, the reduction reaction is a critical process in MnO 2 ore metallurgy and strongly influences the recovery of Mn.
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].
The effects of mass ratio of CaS to ore, reduction temperature, reduction time, liquid to solid ratio (L/S ratio), stirring speed, leaching temperature, leaching time and H 2 SO 4 concentration on the leaching rates of Mn and Fe during the reduction–acid leaching process were discussed.
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].
