Leaching Of Ore Of Iron

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The Extraction of Iron

Iron ore is not pure iron oxide - it also contains an assortment of rocky material that would not melt at the temperature of the furnace and would eventually clog it up The limestone is added to convert this into slag which melts and runs to the bottom The heat of the

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iron ore leaching

REMOVAL OF SULFUR AND PHOSPHOROUS FROM IRON ORE Keywords sulfur removal chemical leaching iron ore concentrate Introduction A high-grade magnetite-hematite iron ore deposit is located in the Gole-gohar mine Sirjan Kerman province in Iran The geological proven reserve is about 1200 Tg (teragram) and the Gole-gohar complex provides the production of 5 Tg concentrates per year

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Upgrading of Koton Karfe Iron Ore through Roasting and

iron ore by atmospheric organic acid leaching with the aim of upgrading the iron ore to concentrate and super-concentrate for use in indirect and direct iron making processes respectively The work involved chemical and mineralogical characterization

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(PDF) Quantitative leaching of a Nigerian iron ore in

Abstract A study on the quantitative leaching of iron ore in hydrochloric acid solution has been undertaken The elemental composition of the iron ore was also carried out using ICP-MS technique The major elements in the iron ore include Fe

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Iron Control in Atmospheric Acid Laterite Leaching

acid leaching of nickel cobalt copper or zinc Iron dissolved in the atmospheric leaching precipitates and acid generated during the iron precipitation reaction is used for nickel dissolution from poor nickel ore Jarosite precipitation is widely applied in hydrometallurgy to remove iron from the pregnant leach

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iron III

Iron Ore vs Iron Formations This leaching of silica amounted to removal of nearly 50% of the original volume of the rock As a result the ore was very porous and unable to support the weight of overlying rock layers which slumped into ore bodies The removal of silica thus allowed an increase in the iron content from an initial 25 to 35

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Bioleaching Introduction Methods Application Copper

For instance thousand tons of uranium ore must be handled in other than bioleaching processes to obtain one ton of uranium This is an indirect leaching process since the microbial attack is not on uranium ore directly but on the Iron oxidant Ferric sulphate and sulfuric acid can be produced by T ferrooxidans from the pyrite within the

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process of mining iron ore leaching process

EP1325164B1 Pressure leaching process for zinc recovery A process for the recovery of zinc from a zinc sulphate ore orprises the steps of subjecting the concentrate to pressure leaching with an acidic solution containing at least about 15 g/l iron in solution to produce a zinc solution and a solid leach residue containing iron

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The leaching of sulfide iron (II) with sulfuric acid

Aug 25 2015The leaching of iron (II) sulfate concentrate from Chaabet El Hamra Algeria bulk sulphide ore with sphalerite concentrate in presence of sulfuric acid and hydrogen peroxide at low stirring rates (100 rpm) The influence of leaching temperature leaching time particle size and sulfuric acid concentration were studied

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Iron Control in Zinc Pressure Leach Processes

If sodium potassium or ammonium ions are present in the leach solution the corresponding jarosite species will be precipitated in the low-acid leach The precipitation of iron in the pressure-leach autoclave may be minimized by maintaining a relatively high residual acid concentration in the pressure-leach

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Leaching of Pyrite by Acidophilic Heterotrophic Iron

Pyrite leaching by strain T-23 grown in an organic compound-rich medium and incubated either shaken or unshaken was also assessed The potential environmental significance of iron-oxidizing heterotrophs in accelerating pyrite oxidation is discussed

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CHLORIDE HYPOCHLORITE OXIDATION AND LEACHING OF

(Fig 4) Major elements composition of the ore and floated concentrate are presented in Table 1 As shown in this table by flotation of the ore with 3 770 g/Mg gold a con-centrate containing 20 451 g/Mg gold was obtained After 24 hours direct cyanide leaching of the initial ore resulted in

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The Construction of Bakırtepe Heap Leaching Area

Demir Export A Ş has been operating iron ore mines since its foundation in 1957 Later DE also produced zinc lead silver copper and gold concentrates Along with production of the above mentioned ores our Company has an important place in other mining activities such as ore enrichment mine production and haulage contract works

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Kinetics of Leaching of Iron Oxide in Clay in Oxalic Acid

Iron oxide in samples of clay containing 8 15% iron oxide was leached in aqueous oxalic acid and hydrochloric acid solutions Leaching experiments were conducted in the temperature range of 40–80C for times up to 90 minutes in 0 2 M to 2 M acid solutions The mixed kinetic mechanism seemed to be the most appropriate model to fit the kinetic data of leaching in oxalic acid while product

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Comparative Kinetics of Iron Ore Dissolution in Aqueous

It was determined that the dissolution rate increased with increased solution concentration temperature time and decreased particle size of the ore The optimum conditions for effective dissolution of 88% of the iron ore were found to be 8 Mof the solution 353 K 100 min and ore particle size of less than 75 μm

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Bioleaching

Apr 30 2015Microbial leaching of refractory process metal ores to enhance gold and silver recovery is one of the promising applications Gold is obtained through bioleaching of arsenopyrite/pyrite Silver is also obtained by bioleaching of arsenopyrite but it is more readily solubilized than gold during microbial leaching of iron sulphide 19

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Bacterial leaching of ores and other materials

The technical set-up of uranium ore leaching may be the dump method but sometimes a variation of this so-called heap or basin leaching is applied The ore is set up in basins The mode of operation is preferably a two stage leaching the out-flowing liquor in which the iron is largely in the ferrous form is treated in an oxidation pond

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Removal of phosphorus from iron ores by chemical leaching

Alkali-leaching and acid-leaching were proposed for the dephosphorization of Changde iron ore which contains an average of 1 12% for phosphorus content Sodium hydroxide sulfuriced hydrochloric and nitric acids were used for the preparation of leach solutions

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Processes for phosphorus removal from iron ore

2 2 1 Chemical Processes Acid leaching has been considered as an alternative to flotation for removing phosphorus from iron ore Technologically the leaching process is a simpler way to treat the fine-particle sinter feed without the restrictions that are necessary in flotation

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Metallurgic Processes

Leaching A widely used extractive metallurgy technique which converts metals into soluble salts in aqueous media Steelmaking is the second step in producing steel from iron ore where impurities are removed from the raw iron and alloying elements are added to produce the exact steel required

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Investigation of Chemical and Microbial Leaching of Iron

Abstract Investigations on the chemical and microbial leaching of a Nigerian Iron-ore in sulphuric acid have been carried out The influence of physico-chemical parameters such as acid concentration temperature particle size and stirring speed on

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PAPER OPEN ACCESS Effect of ore mineralogy on the

leaching reagents without reductant leaching temperature of non-reducing leaching and reducing agents of sulfuric acid leaching were determined to investigate the leaching performances of the two manganese ores Manganese leaching efficiency from WK ore is always higher than that from TG ore under the same leaching conditions

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Sulphuric acid leaching of zinc and copper from Nigerian

sulphuric acid for the leaching of zinc and copper in the presence of hydrogen peroxide considering influencing parameters such as concentration of hydrogen peroxide leaching time particle diameter and stirring speed Experimental mode Materials The complex sulphide ore used in this study was obtained

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Bioleaching

In slope leaching the ore is finely ground and kept in large pile in a slope which is subjected to continuous sprinkling of aqueous solution of microorganisms The leach liquor collected at the bottom of the ore is processed further for metal recovery II) In-situ Leaching In in situ leaching ore is subjected to bioleaching in its natural

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Microbial Bioremediation

It is performed by iron and sulfide oxidizing bacteria or acid producing fungus Bacteria recycle the major leaching reagent like ferric iron and perform further oxidation steps while gaining energy from the electron transfer Key Terms ore leaching The process of recovering metals from ores by using a number of different techniques

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A Kinetic Study of the Leaching of Iron and Manganese from

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

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US2805936A

US2805936A US450276A US45027654A US2805936A US 2805936 A US2805936 A US 2805936A US 450276 A US450276 A US 450276A US 45027654 A US45027654 A US 45027654A US 2805936 A US2805936 A US 2805936A Authority US United States Prior art keywords nitric acid slurry metal value dissolved arsenic Prior art date 1954-08-16 Legal status (The legal status is an assumption and is not

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Bioleaching

Bioleaching is the extraction of metals from their ores through the use of living organisms This is much cleaner than the traditional heap leaching using cyanide Bioleaching is one of several applications within biohydrometallurgy and several methods are used to recover copper zinc lead arsenic antimony nickel molybdenum gold silver and cobalt

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A Kinetic Study of the Leaching of Iron and Manganese from

The leaching rates were significantly dependent on the particle size of the ore stirring speed temperature concentration and the nature of the acids used Within the first 120 min of leaching iron and manganese were largely leached by HCl solution After 120 min more iron was leached by H

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Research on Reinforcing Acid Leaching of a Refractory

The characteristics of Yangla copper oxide ore and acid leaching of this copper ore were investigated The results indicate direct dump acid leaching of raw ore is not feasible for the treatment of this copper ore in practice Sieve sizing-warming-stirring-acid leaching process was employed for the treatment of the fine grain materials below 1m while 66 19% copper leaching efficiency and10 92

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8 Microbial Leaching of Metals

leaching operations were the height of the heap particle size initial ore washing with acid and temperature control to about 50C (SALKIELD 1987) Another critical factor was the supply of water for the leaching heaps Al-though usually acidic mine waters were used for ore

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Empirical Analysis of Iron Extraction Based on Phosphorus

Leaching Time of Iron Ore in Hydrogen Peroxide Solution T O Chime Department of Chemical Engineering Enugu State University of Science Technology Enugu Nigeria ABSTRACT Empirical analysis of iron extraction was carried out based on removed phosphorus concentration and leaching time of iron ore in hydrogen peroxide A model was derived

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Impact of leaching from iron ore mines on terrestrial and

Impact of leaching from iron ore mines on terrestrial and aquatic environment Verma S R Chaudhari P R Shanta Satyanaranyan International Journal of Environmental Sciences Volume 2 No 4 2012 2379 Therefore the present study was carried out to analyse the potential risk to the environment

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Producing Copper Nature's Way Bioleaching

Bioleaching does not recover the precious metals in the ore The precious metals are often an important component in the profitability of the operation The requirement for the smelter to produce acid for conventional leaching and to supplement bioleaching if the ore body is

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Pressure Acid Leaching of Nickel Laterites A Review

The mechanism of leaching involves acid dissolution of the host mineral lattice followed by hydrolysis and precipitation (transformation) of a variety of insoluble oxides and sulphates of iron aluminium and silica under the high temperature conditions Optimum leaching conditions and final liquor composition varies according to the ore mineralogy

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leaching gold from gold bearing iron ore

bearing refractory gold and silver ore by diagnostic leaching cyanide leaching tests showed that the extractions of gold and silver from the ore (d80 50 refractoriness of iron oxy/hydroxide bearing gold/silver ore and as a More details Get Price

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