At present, the pyrolusite-pyrite reduction system is used for acid leaching of manganese ore on an industrial scale, namely the "two-ore method", where pyrite is used as a reducing agent [23, 27, 30].During the leaching process, the process of converting S 2− to SO 4 2− occurs, which involves multiple transfers of electrons and subsequently generates many …
Ni extraction from laterite ore has progressively intensified via various hydrometallurgical methods. One of the by-products of the leaching process is Mn, which can increase the resilience of this metal supply on the market. By observing the effects of the laterite roasting temperature and the effects of the Mn leaching temperature and duration, we can …
The Bureau of Mines conducted column-leaching tests on 25 domestic Mn ores to determine the feasibility of extracting Mn by in situ or heap leaching with dissolved sulfur …
Through optimization and mechanism study, this paper provides an opportunity to co-leach the manganese–silver ore and silver-bearing pyrite process in a more economical …
In this work, bio-hydrometallurgy technology was employed and a novel two-stage method based on successive chemical and bio treatments was proposed to collaboratively utilize manganese–silver ore and silver-bearing pyrite. In the optimization research of the chemical leaching stage, the sensitive factors for the Mn leaching efficiency were screened by …
The recovery of manganese from manganiferous ores by bioleaching with different kind of microorganisms have been extensively investigated by many workers and microbiological processes have been proposed to be less hazardous (Ehrlich, 1987; Silverio and Madgwick, 1985).The present study was initiated with the isolation of a fungus, Penicillium citrinum …
Leaching studies of low-grade Joda manganese ore containing 24.7% Mn and 28.4% Fe were carried out at high temperature and atmospheric pressure using oxalic acid as reductant in sulphuric acid medium. The experiments were designed according to 2 4 full factorial design, and regression equations for extraction of manganese, iron and aluminum were …
Meanwhile, a comprehensible understanding of the leaching kinetics is necessary for an efficient design of leaching manganese ore [17].Previous research on the leaching efficiency of MnO 2 with Fe 2+ in H 2 SO 4 solution is controlled by chemical reaction with the apparent activation energy (E a) of 28 kJ·mol −1 [18].Vegliò et al. [19] investigated leaching in lactose …
Manganese leaching from a low-grade ore (8.52% Mn) from Sinai was investigated by using hydrochloric acid in the presence and absence of hydrogen peroxide as a reducing agent. Sample characterization by XRD showed the presence of a variety of manganese minerals mainly cryptomelane, chalcophanite, pyrolusite, and crednerite. ...
Mn contents of these ores ranged from 2 to 30 pct. Column-leaching of 11 ore samples containing primarily pyrolusite, psilomelane, and/or wad resulted in 73- to 97-pct Mn extraction, with an average extraction of 86 pct. Column leaching of three ore samples containing primarily manganese carbonates, two ore samples containing primarily ...
A study by Das et al. (1982) showed that the reaction of MnO2 in the low manganese ore with ferrous sulfate could occur in three ways: More than 90% of manganese could be extracted by leaching the low manganese ore with a stoichiometric amount of ferrous sulfate at 90 °C for 1 h with solidliquid ratio of 1:10.
Leaching studies of low-grade Joda manganese ore containing 24.7% Mn and 28.4% Fe were carried out at high temperature and atmospheric pressure using oxalic acid as reductant in sulphuric acid medium.
The extraction of manganese from a semi-oxidized manganese ore was investigated with sucrose as the reducing agent in dilute sulfuric acid medium. The kinetics of leaching manganese from the complex ore containing MnCO3 …
The increasing global demand for Mn necessitates cost-effective recovery methods applicable to low- and medium-grade ores. Reductive bioleaching has emerged as a promising technique for Mn extraction from low-grade ores. This study aimed to simultaneously bioleach both Cu and Mn from low-grade ore obtained from Boleo, Mexico, using …
Manganese ore was also analyzed by thermal analysis to observe their thermal decomposition character. In this study, sulphuric acid (H 2 SO 4, 6 M) was deployed as leaching agent. The leaching process was performed at 90 °C for two hours with the addition of NH 4 OH to control pH. Recovery percentage of leaching process yielded of 87 % Mn ...
Manganese released from the piled manganese ore wastes is a great threat to the local ecosystem and human health. The mechanism and dynamic characteristics of manganese release from the manganese ore wastes were studied based on the static and dynamic experiments. The concentration of manganese in the leaching solution under the intensive …
For low-grade manganese oxide ores, leaching manganese is preferred when other impurity minerals are insoluble. Because MnO 2 is stable in acidic and alkaline conditions, it is necessary to transform insoluble Mn (IV) into soluble Mn (II) when leaching manganese from manganese oxide ores (Sinha and Purcell 2019).Available methods include: SO 2 reduction …
Manganese ore is an important raw material for production of steel, ferromanganese, non-ferrous alloys, dry cell batteries, paints and other chemicals. ... on well-characterized synthetic analogues of manganese and iron minerals in nodules for a better understanding of the leaching behaviour of manganese and iron.
The beneficiation of low-grade manganese ore is investigated using applied magnetics separation, multi-gravity separator, shaking table, flotation methods, and sulfuric acid leaching. …
In this research, EDTA/EDTA-2Na was firstly employed as both reductant and lixiviant in one-step reductive leaching of manganese oxide ores in an aqueous medium.
Effects of the mass ratio of manganese ore to sawdust, roasting temperature and time, leaching temperature and time, leaching agent concentration and liquid-solid ratio were studied. 97.71% of ...
Electrolytic metal manganese (EMM) is an essential strategic resource [1], [2].China is currently the largest producer and exporter of EMM with an annual production of over 0.81 million tons in 2022 [3].However, with the increasing consumption of manganese ore, the quality has gradually decreased [4].More and more companies have begun to try to use low …
Selective-reductive leaching of manganese from low-grade manganese ore using tannic acid as a reductant in acidic media was demonstrated by XRD, SEM-EDX …
In this study, corncob was used as reductant for sulfuric acid leaching of manganese ore from Daweezi, Upper Mohmand Agency, Pakistan. X-ray diffraction of representative powdered samples revealed the presence of manganese silicate MnSiO(SiO4), calcite (CaCO3), and -quartz (SiO2). X-ray diffraction and energy dispersive spectroscopy analyses indicated that the …
Electrolytic manganese residue (EMR) is a mixed filter slag generated during electrolytic metal manganese (EMM) production. It mainly consists of the leaching residue from the reaction between manganese ore and sulfuric acid, as well as the precipitation residue obtained from the impurity removal of manganese sulfate electrolyte.
The present study focuses on the leaching of MnO2 form manganese ore by acid leaching method using glucose as a reducing agent. The leached MnO2 was used to prepare nano LaxCa1-xMnO3 and LaxSr1 ...
The results indicated that manganese oxide ore can be reduced by alkali lignin by microwave roasting at a weight ratio of alkali lignin to ore 50% and a roasting temperature 150°C for 5 min, and under these roasting conditions, a leaching ratio of manganese of 97.43% was obtained from manganese oxide ore with Mn content of 27.78% using a ...
The reductive leaching of manganese from low-grade manganese ore( 20. 5% Mn) in dilute sulfuric acid in the presence of xanthan gum wastewater is investigated. The effects of solid-to-liquid … Expand
The current study provides a new technological process for leaching manganese from a low-grade ore from Um-Bogma, Sinai, Egypt utilizing HCl acid in presence of thiourea as decreasing agent. The sample was analyzed utilizing wet chemical, XRD, and SEM techniques. The XRD data indicated the presence of many manganese minerals, including pyrolusite and …
Leaching of manganese ore using oxalic acid-producing microorganisms has been reported (Stone, 1987). Chemical leaching of Mn ore using oxalic acid may give an insight into bioleaching. The dissolution of manganese is due to reduction of its dioxide by oxalic acid.
Abstract Manganese was extracted from leaching low-grade manganese ore in sulfuric acid medium. The effects of granule diameter, leaching time, liquid/solid ratio (V/W) and the concentration of sulfuric acid were investigated through orthogonal and single factor experiments. The experimental results showed that the optimal leaching condi-
Hydrometallurgy, 2001. Leaching studies of low-grade Joda manganese ore containing 24.7% Mn and 28.4% Fe were carried out at high temperature and atmospheric pressure using oxalic acid as reductant in sulphuric acid medium.
Cornstalk is usually directly used as a reductant in reductive leaching manganese. However, low utilization of cornstalk makes low manganese dissolution ratio. In the research, pretreatment for cornstalk was proposed to improve manganese dissolution ratio. Cornstalk was preprocessed by a heated sulfuric acid solution (1.2 M of sulfuric acid concentration) for 10 min …
SO2 leaching of manganese ore (A bbruzzese, 1990; Abbruzzese et al., 1990; Grimanelis et al., 1992; Naik et al., 2000) and manganese nodules (K halafalla and Pahlman, 1981; Kanungo and Das, 1998) have been studied by some authors. But the effect of mineral fabric on SO2 leaching of manganese ore has not