FUNGAL LEACHING OF MANGANESE ORE C. Acharya, R.N. Kar, L.B. Sukla and Vibhuti N. Misra Regional Research Laboratory, Bhubaneswar-751 013. Email [email protected] (Received 16 April 2004 in revised form 30 June 2004) ABSTRACT Bioleaching is technologically feasible for extraction of manganese from low grade ores (containing manganese.Read More
Leaching of various types of ores, containing 12-30 manganese, by the thiobacterium Acidithiobacillus ferrooxidans was studied. Leaching of reduced ores (manganocalcite and manganiferous limestone) was mediated mainly by degradation of manganiferous minerals (by sulfuric acid produced in the course of bacterial oxidation of pyrite or sulfur).
Abstract Manganese is a strategically important metal that is widely used in industrial applications such as steel, catalysts, and batteries. Manganese generally presents as manganese dioxide (MnO2) in most of the ores. As MnO2 is stable in acid or alkaline oxidizing conditions, manganese extraction must be performed under reducing conditions to convert the insoluble Mn(IV) to soluble Mn(II.
When an aqueous suspension of pyrite and a manganese ore reacts with oxygen, manganese is dissolved by the ferrous sulphate and sulphuric acid produced in situ by oxidation of pyrite. In the absence of added acid, the optimum conditions are a molecularratio of Mn02 FeS2 of about 10, a temperature of about 1400 C., and an oxygen pressure between 25 and 90 lb. sq. in.
This study discussed the effects on leaching rate of from low-grade manganese ore using three reductants (Hydrogen peroxide, Glucose, Cellulose). The results showed great increase of extracting rate can be obtained in the process of leaching by adding a small amount of reductant. the leaching rate of two valence manganese can reach a maximum of 90.76 , using hydrogen peroxide as the reductant.
A process flowsheet was developed that incorporated hcl-caf2 leaching, excess leach acid utilization, fluoride (f) recycle, and mn recovery. When the domestic manganese silicate ore was processed, 98 pct of the mn was extracted, 99 pct of the caf2 was reclaimed, and a leach residue was produced that passed the Environmental Protection Agency.
The process of leaching manganiferous ocean nodule ores with HCl whereby the manganese and other metals present, such as iron, zinc, cobalt, nickel, copper, and like are converted from oxides, silicates or other insoluble forms to water soluble chlorides, and are thereafter separated, purified, and the manganese recovered as MnO 2 by oxidation with chlorine to provide a material suitable for.
Manganese was obtained for Gabonese manganese oxide ore, while over 90 manganese was leached with further increase to 10 1 for Xiangxi manganese oxide ore, and the leaching efficiency reached over 99 when the mass ratio of manganese oxide ore to waste tea was 10 1.5. The amount of waste tea was dependent on the.
Manganese metallurgy review. Part I Leaching of ores secondary materials and recovery of electrolytic chemical manganese dioxide.
Leaching except for acid leaching of Mn(II) ores. Puri-fication, separation and final recovery processes such as solvent extraction, electrolysis and electrowinning, and other recovery processes are then used. 3.1. Reductive leaching with ferrous iron solution Treatment of manganese ore or manganese bearing.
Leaching of manganese ores using corncob as reductant in H 2 SO 4 solution 57 of reducing agents and acids (Pagnanelli et al., 2004). Coal is used as a reductant in traditional technology in order to convert manganese dioxide to manganese oxide which can be leached by sulfuric acid. This method produces smoke, dust, oxysulfide,.
Leaching of Manganese ore from Northeastern Vietnam by Reduction with SO2 gas in an H2SO4- rich Solution. Duy Anh. Related Papers. Manganese metallurgy review. Part I Leaching of ores secondary materials and recovery of electrolytic chemical manganese dioxide. By Chu Cheng.
The Manganese ore leaching was carried out with pulp density of ore 2 , 150 rpm at room temperature. The experiment was carried out for 6 days and reading of percentage of leaching was noted at every 3 days interval by titrating with EDTA. To calculate leaching percentage the standard graph was prepared.
The leaching of manganese dioxide ore, the experimental data were analyzed on the basis of the shrink ing core model [13,21]. If the reac-tion rate is controlled by inner diffusion, its rate equation is as fol-lows (3) If the reaction is controlled by the surface reaction, the rate equa-.
May 15, 2014 The kinetics of reductive leaching of manganese from a low-grade manganese oxide ore were studied using cellulose as reductant in dilute sulfuric acid medium. It was found that when the stirring speed was higher than 200 r min, the effect of gas film diffusion on manganese extraction efficiency could be neglected, and the kinetic behavior was investigated under the condition of.
CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda) The sulfur dioxide process was first patented by Van Arsdale and Mair in 1918 , but in recent time it caught the attention of manufacturers of electrolytic manganese dioxide (EMD). Compared to a conventional process, where Mn ore is heated to about 1,000 oC to convert MnO2 to MnO dissolved in hot sulfuric acid.
Nov 21, 2018 The kinetics of reductive leaching of manganese from iron-rich manganese dioxide ore (IRMDO) using bagasse pith as a reductant in the presence of sulfuric acid was investigated. The effects of reductant type, stirring speed, ore particle size, leaching temperature, sulfuric acid concentration and weight rati.
3.6. Influence of Time on Leaching of Manganese Ore. Three sets of experiments were performed in order to study the influence of time on leaching efficiency of manganese ore. The ore sample was treated for 1 h, 2 h and 3 h at constant sawdust amount 5 g, sulfuric acid concentration 5 (v v), leaching temperature 90˚C and 200 mesh size Mn-ore.
May 10, 2006 Leaching of various types of ores, containing 12–30 manganese, by the thiobacterium Acidithiobacillus ferrooxidans was studied. Leaching of reduced ores (manganocalcite and manganiferous limestone) was mediated mainly by degradation of manganiferous minerals (by sulfuric acid produced in the course of bacterial oxidation of pyrite or sulfur). Bacterial treatment of the ores.
When an aqueous suspension of pyrite and manganese ore reacts with oxygen, manganese is dissolved by the ferrous sulphate and sulphuric acid produced by the oxidation of pyrite. The kinetics of certain steps in the overall reaction were studied. A rate equation for the oxidation of ferrous sulphate by gaseous oxygen was derived for the temperature range from 1000 to 200 C.
May 15, 2018 The aims of this research were to study the leaching process of manganese ore which originated from Sumbawa, Indonesia and its characterization. A high grade Indonesian manganese ore from Sumbawa, West of Nusa Tenggara was characterized by X-Ray Fluorescence (XRF). The result showed composition of 78.8 Mn, 17.77 Fe and the rest were trace.
Jul 18, 2013 T he feasibility of recovering manganese by leaching low grade ore with aqueous sulphur dioxide has been investigated. Successful extraction was achieved at atmospheric pressure and room temperature. The concentration of manganese in the leach liquor increased with increase in pulp density. At higher pulp densities (e.g. 40 and 50 ), the.
A kinetic study of the leaching of iron and manganese from powdered tantalite-columbite ore by Hydrochloric Acid (HCl) and Sulphuric Acid (H 2 SO 4) solutions has been carried out.The effects of (a) particle size ranging from 63 to 250 μm (b) stirring speed ranging from 180 to 540 min-1 (c) acid concentration ranging from 4.0 to 10.0 M (d) temperature ranging from 30 to 90 on the leaching.
Leaching of manganese ore with aqueous sulphur dioxide solutions PRAFULLA R RAISONI and SHARAD G DIXIT Department of Chemical Technology, University of Bombay, Matunga, Bombay 400 019, India Abstract. Manganese can be easily leached from chemically inert manganese ore by aqueous solutions of SOz.
Manganese recovery from industrial ore processing waste by means of leaching with sulfuric acid was the objective of this study. Experimental conditions were optimized by multivariate experimental design approaches. In order to study the factors affecting leaching, a screening step was used involvin.
Mar 24, 2021 Manganese ore also can be recovered by acid leaching for production of battery grade manganese dioxide for low-manganese ores. Leaching of manganese ore was carried out with diluted sulphuric acid in the presence of pyrite in the temperature range from 323 to 363 K. Equipment for the Manganese Ore Processing Plant The main crushing equipment.
Manganese recovery from industrial ore processing waste by means of leaching with sulfuric acid was the objective of this study. Experimental conditions were optimized by multivariate experimental design approaches. In order to study the factors affecting leaching, a screening step was used involving a full.
Tian X, Wen X, Yang C, Liang Y, Pi Z, Wang Y. Reductive leaching of manganese from low-grade manganese dioxide ores using corncob as reductant in sulfuric acid solution. Hydrometallurgy 2010 100(3-4) 157-60.
Aug 04, 2001 A kinetic study of a manganiferous ore leaching in acid media by glucose as the reducing agent is here reported. The shrinking-core model opportunely modified was used to describe the kinetics of the manganese dissolution. Considering the complex network of chemical reaction involved in this process, a variable activation energy term was introduced in the kinetic model to take into.
Jul 15, 2019 The purpose of manganese ore calcination process is First, the high-priced manganese oxide is reduced to low-priced manganese oxide, which facilitates the dissolution of manganese into an ionic state during wet leaching process Second, the weak magnetic iron minerals is reduced into ferromagnetic magnetite or maghemite (γ-Fe203), thereby.
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 at 80 C.