Reductive roasting of ironrich manganese oxide ore with. Stone 1987 reported leaching of manganese ore using oxalic acid along with producing microorganisms 21. Manganese ore leaching by dissolved sulphur dioxide. A good number of works have been reported on the hydrometallurgical leaching of iron and manganese from their ores using various leachants such as chloride media, mineral acids with or without oxidants 15. Kinetic study of the leaching of lowgrade manganese ores by. Separation of manganese from iron in the reductive leaching iron. The effects on manganese extraction of leaching reagents without reductant, leaching temperature of nonreducing leaching, and reducing agents of sulfuric acid. The mineral contents of the ores significantly affected the leaching performances and mineral dissolution behaviors of the samples. Pdf manganese extraction from a lowgrade ore was investigated using cane molasses. The mn content of these ores varied from 15 to 39%. When manganese ore is converted into manganese alloy, there is a loss of about 15% of manganese as slag. Manganese mn extraction from ironrich pyrolusite ore with cheap sulphur dioxide is considered to be the most promising. It appears, therefore, that leaching mn opens up the pores, allowing penetration of the leach solution into the ore pieces.
Leaching of pyrolusite ore using sulfuric acid medium and in presence of sawdust as a reductant to produce manganese sulfate could be. In some references, it was found that reducing agent was required in the leaching of manganese from manganese ore due to the stability of manganese in the manganese ore. Finally, it was used for bioleaching of low grade manganese ore. Study of the leaching of a manganese mining residue by na2so3. Pdf reductive acid leaching of low grade manganese ores. Our study on acid leaching of manganese ore with oxalic acid and citric acid gives a comparative data about. Reductive acid leaching of low grade manganese ores. Pdf leaching of manganese ore from northeastern vietnam. Acharya and others published fungal leaching of manganese ore find, read and cite all the research you need on. Dissolution of manganese dioxide ore in sulfuric acid in the presence of ferrous ion. From the results shown in table 1, it can be observed that a minimum of 5 g of sawdust per 10 g of ore is required for quantitative extraction of manganese. Manganese extraction from a lowgrade ore was investigated using cane molasses as a reducing agent in dilute sulfuric acid medium. A kinetic model of the leaching process was studied and ore and black locust materials before and after leaching were also analyzed. The grade of manganese concentrate should be increased by 24% 25% to 36% 40%.
The extraction of manganese from a semioxidized manganese ore was investigated with sucrose as the reducing agent in dilute sulfuric acid medium. The effects of stirring speed, liquidsolid ratio, sawdust ore mass ratio, sulfuric acid concentration, reaction temperature, and time on the manganese extraction were examined. In the absence of added acid, the optimum conditions are. It was found that when the stirring speed was higher than 200 rmin, the effect of gas film diffusion on manganese extraction efficiency could be neglected, and the kinetic behavior was investigated. The effects of various parameters such as pulp density, particle size, sucrose. The leach slurry obtained under the above conditions was gelatinous and difficult to filter. In order to study the factors affecting leaching, a screening step was used involving a full. The kinetics of reductive leaching of manganese ore with dioxide ore by ferrous sulphate in the presence of sulphuric acid was examined zakeri et al. Positive growth in iron and steelmaking has caught an attention to recover manganese 1. Leaching process and kinetics of manganese in lowgrade. Reduction leaching of manganese dioxide ore using black. This investigation showed that treatment of the slag in hydrogen prior to leaching enhanced manganese extraction.
The crucial issue is the purification of leach liquors and the selective recovery of copper, nickel and cobalt is often difficult from solutions containing soluble iron and manganese. Recovery of manganese from steel plant slag by carbamate. Various direct reductive leaching processes have been studied and developed for processing low manganese ores and ocean manganese nodules, including leaching with ferrous iron, sulfur dioxide, cuprous copper, hydrogen peroxide, nitrous acid, organic reductants, and bio and electroreductions. The objective of this work is to establish a reductant which can be used for leaching mn from all types of ores. In this research work, sawdust was used as a reducing agent for sulphuric acid leaching of manganese ore from prang ghar, lower mohmand agency, pakistan. Leaching studies of lowgrade egyptian manganese ore containing 25. Chamberlainj abstract the bureau of mines has conducted research on a dual leaching. Leaching of manganese ore with aqueous sulphur dioxide solutions. Despite low water permeabilities of the ores as low as 102 to 104 darcy, greater than 90 pct of the mn was extracted from even the largest ore pieces tested approximately 10 cm in diameter. The leach pulp is agitated for a predetermined time period at predetermined temperatures. May 15, 2014 the kinetics of reductive leaching of manganese from a lowgrade manganese oxide ore were studied using cellulose as reductant in dilute sulfuric acid medium. Manganese ore 20122020 data 20212022 forecast price. Carbohydrates are nonhazardous and low cost reducing agents that may be used under mild conditions 22, 23.
Initial investigation into the leaching of manganese from. Leaching of manganese silicates, although slow, resulted in solubilization of 1 to 2 g of manganese per liter of leach. Study of the leaching of a manganese mining residue by na 2 so 3 in sulfuric acid solution written by a. Effect of various parameters on insitu leaching of manganese ore with p. Leaching behaviour of other manganese containing materials.
Manganese recovery from industrial ore processing waste by means of leaching with sulfuric acid was the objective of this study. Leaching of manganese ore from northeastern vietnam by reduction with so2 gas in an h2so4 rich solution. The apparent activation energy of the total manganese, mno2, and mnco3 leaching were 40. Selectivereductive leaching of manganese from lowgrade manganese ore using tannic acid as a reductant in acidic media was demonstrated by xrd, semedx ch the ph change in the liquid phase before and after leaching revealed that selectivity of manganese over iron was due to the hydrolysis of iron. A method of processing manganese ore by adding the ore to an aqueous solution of acid and h 2 o 2 to form a leach pulp. There are a large number of reports about using organics as reductants to leach manganese oxide ores 9,10. Leaching time was varied from 2 h to 8 h while keeping the sawdust as 3 and 5 g10 g of ore. The remaining 85% of manganese alloy is further divided and used into crude steel 90% and others 10%. However, manganese extraction from the leach liquor along with cobalt could not be avoided, thus increasing the cost of the process. Xinhai has already achieved many designation and reformation of the manganese ore project, a project of aboard is a great success. This page refers to the manganese ore with 32% manganese, and 20% iron in north china, tianjin port from south africa.
After leaching an amount of manganese that would simulate the recovery in a heap or in situ leaching operation 65 to 95 pct, the material rema1n1ng in the column was rinsed with a 0. Selectivereductive leaching of manganese from lowgrade. Manganese ore processing technology and equipment jxsc. A comparative study on acid leaching of low grade manganese. As a general rule, however, when oxides of manganese are present in a silver ore trouble may confidently be expected. Leaching these ores with solutions containing only 5wtpct so2 and no added h2so4 resulted in mn being selectively extracted over fe except when. Kinetic study of the leaching of lowgrade manganese ores. Manganese leaching efficiency from wk ore is always higher than that from tg ore under the same leaching conditions. Manganese ore is primarily used in steel and iron production among other uses like as an additive in unleaded gasoline and as pigments for the coloring of ceramics and glass.
Acid leaching is appropriate to be applied in extracting manganese due to the formation of sulfate. Pdf leaching of manganese ore from northeastern vietnam by. Reductive leaching of manganese from lowgrade manganese ore. The reductive leaching of manganese from a lowgrade manganese oxide ore was investigated by using pretreated sawdust as the reductant in a sulfuric acid medium. A method for leaching or dissolving gold from ores or. In addition, it was found that the leaching process of semioxidized manganese ore follows the shrinking core model and the leaching rate was controlled by chemical reaction and diffusion. To produce a good quality steel, manganese mn is added to make the steel more resistance and strength. Experimental conditions were optimized by multivariate experimental design approaches. Manganese was extracted from leaching lowgrade manganese ore in sulfuric acid medium. Paper open access effect of ore mineralogy on the reductive.
In the hydrometallurgical processing of manganese from its ore, the leach liquors often contain divalent ions such as iron, copper, nickel, cobalt and zinc along with other manganese impurities which make manganese very difficult to separate. Oxalic acid can also be used as a reducing agent for manganese extraction from manganese dioxide ore 5, 6. The leach pulp is then separated into a solid fraction and a liquid fraction containing solubilized metals. All of the materials used in heap leaching process and industry specifications of materials are. Take the liancheng manganese processing plant as an example, it mainly deals with leaching type manganese oxide ore, using am30 jig machine treat 30 3 mm cleaning ore, can obtain highquality manganese concentrate containing more than 40% manganese mineral. Hydrometallurgical process and kinetics of leaching manganese. Selectivereductive leaching of manganese from lowgrade manganese ore using tannic acid as a reductant in acidic media was demonstrated by xrd, semedx characterization, and batch leaching. Dissolved so2 was found to be effective for leaching mn.
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. In the present study, six process parameters were investigated i. Leaching of various types of ores, containing 1230% manganese, by the thiobacterium acidithiobacillus ferrooxidans was studied. This reduces all of the manganese ore to manganese oxide mno, which is a leachable form. Manganese mn leaching and recovery from lowgrade pyrolusite ore were studied using sulfuric acid h2so4 as a leachant and. Among these processes, the leaching with cheap sulfur dioxide or ferrous ion is most promising and has been operated in a pilot scale. Effects of specific parameters on the reductive leaching efficiency of manganese were investigated, respectivel y. Dual leaching method for recovering silver and manganese from domestic manganiferous silver deposits by john e. Kitane a published on 20830 download full article with reference data and citations. The effect of various reducing agents on the sulfuric acid leaching of pyrolusite ore from wk ore and tg ore was conducted using 1. Reductive acid leaching of low grade manganese ores author. Indian ocean manganese nodules, medium and low grade mn ores of gujarat, and low grade mn ore of orissa, india. A reductive leaching process for a lowgrade manganese ore has been successfully demonstrated using a mixture of sulfuric acid and cane molasses as reductants. Us4872909a process for acid leaching of manganese oxide.
Although batch tests on finer particles of ore conducted in flasks had earlier indicated minimal manganese leaching from carbonates and silicates, the percolating action of solutions in column leaching yielded recoveries from carbonate samples of greater than 90 pct. Optimization of the leaching conditions of cobalt and. These data were used to evaluate the growth kinetics. Thermophilic bacterial leaching of manganese dioxide. The ore then travels through a grinding circuit to reduce the particle size of the ore to between 150250. Effect of ore mineralogy on the reductiveleaching of manganese ores. Kinetics of reductive leaching of manganese oxide ore using.
Pdf a comparative study on acid leaching of low grade. Dual leaching method for recovering silver and manganese from. A kinetic study of the leaching of manganese mining residue by sulfuric acid and potassium oxalate has been investigated. Influence of fabric on aqueous so2 leaching of manganese ore p. 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. Manganese alloy used for steel making constitute of the following. Leaching of manganese ore from northeastern vietnam by reduction with so2 gas in an h2so4 rich solution dao, duy anh1 gier. Phase, microstructure and beneficiation of manganese ore. Various direct reductive leaching processes have been studied and developed for processing low manganese ores and ocean manganese nodules, including leaching with ferrous iron, sulfur dioxide, cuprous copper, hydrogen peroxide, nitrous acid, organic reductants. The manganese usually occurs as the dioxide but in what way, if at all, it is associated with the silver has never been determined.
Recovery of manganese from steel plant slag by carbamate leaching. The bureau of mines conducted columnleaching tests on 25 domestic mn ores to determine the feasibility of extracting mn by in situ or heap leaching with. The leaching rates are significantly influenced by the. Rate process of the reduction leaching of manganese nodules in dilute hcl in presence of pyrite. Manganese can be easily leached from chemically inert manganese ore by aqueous solutions of soz. The kinetics of leaching manganese from the complex ore containing mnco3 and mno2 was also investigated. Several authors have evaluated the use of cellulose as a reductant in manganese leaching 11,15. A kinetic study of the leaching of iron and manganese from a. Manganese recoveries from lowgrade ores using organic acids as reducing agents were investigated in the present work. Up to 80 pct of the manganese and 50 pct of the iron could be extracted from a silicon steel slag that had been pretreated in hydrogen at 7000 c. Influence of fabric on aqueous so leaching of manganese ore. Leaching of manganese ores using sawdust as a reductant. Reductive leaching of manganese from lowgrade manganese. Based on its efficiency for manganese solubilisation, it was utilized for the leaching of a lowgrade manganese ore.
The effects of sucrose and sulfuric acid concentrations, leaching temperature and reaction time on the total mn tmn, mno2 and mnco3 leaching. Pdf effect of ore mineralogy on the reductiveleaching of. Dual leaching method for recovering silver and manganese. The kinetics of reductive leaching of manganese from a lowgrade manganese oxide ore were studied using cellulose as reductant in dilute sulfuric acid medium. The effects of concentrations of cane molasses and sulfuric acid, leaching temperature as well as reaction time were discussed.
Xray diffraction of the powdered sample indicated the presence of hausmannite mn3o4, calcium aluminum silicate hydrate, silica sio2 and hematite fe2o3. In addition, it was found that the leaching process of semioxidized manganese ore follows the shrinking core model and the leaching rate was. Pdf hydrometallurgical process and kinetics of leaching. A static culture system was used with cane molasses as the nutrient source. Leaching of oressecondary materials and recovery of electrolyticchemical manganese dioxide. Glucose, leaching, low grade manganese ore, response surface methodology. Xinhai can provide the whole epc service of mineral design and research, equipment manufacture, installation and commissioning, personnel training according to the property of the raw ore. 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. The experiments were designed according to 25 full factorial design, and regression equation for the extraction of mn was determined as a function of h 2 so 4 concentration c, h 2 so 4.
The effects of the reaction agitation speed, manganese ore particle size, acid concentration, oxalate concentration and temperature on manganese rate dissolved. Study of the leaching of a manganese mining residue by. Local pyrolusite ore from ombogma, sinai, has been treated by sulfuric acid leaching process using either sawdust c6h10o5n or lactose c12h22o11 as reducing agent to produce manganese sulfate. Manganese leaching amount were measured by using standard manganese curve and estimated by titration method. Phase, microstructure and beneficiation of manganese ore by. A kinetic study of the leaching of iron and manganese from. The acid leaching potential of both oxalic acid and citric acid were estimated. Kinetics of reductive leaching of manganese oxide ore. Therefore, a method for leaching or dissolving gold from ores or precious metal scrap. The effects of the sawdust ore mass ratio on the leaching efficiency of manganese were examined by varying the sawdust ore mass ratio from 0.
The results indicate that the leaching efficiencies of mn, fe and al increase as the h 2 so 4 concentration and reaction time increase. Heap leaching is bat for suitable ores because it allows the economical processing of ore that would otherwise be uneconomic under con ditions that can technically achieve regulatory acceptable levels of environmental risk mitigation. The effect of acid additions during ferrous sulphate leaching of the ore were also. Limited reports have, however, been published on the leaching of iron and manganese from tantalitecolumbite ore. The effects of granule diameter, leaching time, liquidsolid ratio vw and the concentration of sulfuric acid were investigated through. The pickle liquor completely extracted all the manganese from both the untreated manganese and reduced ore, but also introduced large amounts of iron in the leach solutions. Reductive leaching of manganese from lowgrade pyrolusite ore in. This process employs a relatively low roasting temperature which is considered as a cheap reductive method. Thermophilic bacterial leaching of lowgrade manganese oxide ore was, demonstrated at 50c and 70c. Misra regional research laboratory c sir, bhubaneswar, india received 4 october 2002. It was found that when the stirring speed was higher than 200 rmin, the effect of gas film diffusion on manganese extraction efficiency could be neglected, and the kinetic behavior was investigated under the condition of elimination of. Pdf selectivereductive leaching of manganese from low. Pdf effect of ore mineralogy on the reductiveleaching.
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