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Leaching of a low grade Egyptian chromite ore ScienceDirect

ELSEVIER Hydrometallurgy 43 (1996) 307316 hydrometallurgy Leaching of a low grade Egyptian chromite ore Amer a,*, Ibrahim b a Geology Department, Faculty of Science, Alexandria University, Alexandria 21526, Egypt b Central Metallurgical RD Institute, Helwan, Cairo, Egypt Received 15 September 1995; accepted 16 December 1995 Abstract Hydrometallurgical processing of low …

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Caustic Leaching of Montana Chromite

The Montana chromite from the Stillwater and Sweetgrass deposits is of relatively low grade. The ; is co~posed of massive and disseminated ore occuring in juxaposition with a differentiated igneous sheet of preCambrian These deposits are continuous with an esti ated 10,000,000 tons of possible ore.

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Mineral processing: leaching process of chromium and ...

The percent of reacted chromite ore can be maximized by increasing the roasting time of chromite ore with Na 2 CO 3 and also by raising the annealing temperature up to 1400 °C . Antony et al. have reported that, maximum percent formation and leaching of sodium chromate generally did not exceed 80–82%.

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Effect of mechanical activation on alkali leaching of ...

Key words: mechanical activation; chromite ore; leaching 1 Introduction Chromite ore is widely used in metallurgical and chemical industries for the production of ferrochrome and chromium chemicals, such as sodium dichromate[1]. The production of chromate from chromite ore usually suffers from low extraction ratio and high environmental pollution.

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MODELING CHROMIUM LEACHING FROM CHROMITE ORE …

Chromium has been widely used in many industrial applications. As a result of chromite ore processing, large amounts of chromite ore processing waste (COPW) material that can be classified as hazardous have been produced and released into the environment. Therefore, knowledge of migration behavior and leaching rates of chromium through

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leaching plant chrome ore benefiion process efficient

(Bio) leaching Behavior of Chromite Tailings. 20 Jun 2018 . Both in the mining and in the beneficiation process, a variety of waste . quality during the beneficiation process results in a loss of efficiency and an .. the leaching of the concentrated ore coming from the beneficiation plant.

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Modeling Chromium Dissolution and Leaching from Chromite ...

Dec 30, 2005· As a result of chromite ore processing, large amounts of chromite ore processing residue (COPR) material that can be classified as hazardous have been produced and released into the environment. Therefore, knowledge of migration behavior and leaching rates of chromium through waste materials are of primary concern for environmentally sound ...

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US7670576B2 Methods of treatment of chromite ore ...

ore processing chromite ore Prior art date 20040910 Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Active Reinstated, expires 20260425 Application number US11/578,621 Other versions ...

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(PDF) Mineral processing: leaching process of chromium and ...

for leaching experiments of the chromite ore–Na 2 CO 3. roast with the leaching agents (H 2 O, HCl, H 2 SO 4). A stock . solution (% w/v) of the reagent ammonium pyroli

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Chromite Wikipedia

Chromite ore can be mined to produce chromite concentrate. It can also be crushed and processed. Chromite concentrate, when combined with a reductant such as coal or coke and a high temperature furnace can produce ferrochrome. Ferrochrome is a type of ferroalloy that is an alloy in between chromium and iron.

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leaching process for chromite

chromite production process . chromite is an iron chromium oxide fecr o .it is an oxide mineral belonging to the spinel for the production of ferrochromium the chromite ore fecr o is reduced with either aluminium or silicon in an of pure chromium the iron has to be separated from the chromium in a two step roasting and leaching process.

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Chemistry and Leaching Behavior of Chromite Ore Processing ...

Abstract This study presents chemical, mineralogical, and leaching characterization of chromite ore processing residue (COPR) derived from the soda ash process, which is currently replacing the limebased process in China, the world's largest chromite processor. Results indicated that, while soda ash COPR had 8,500 mg/kg Cr(VI), 90% of that was readily available in deionized water and thus the ...

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Microwave Thermal Prereduction with Carbon and Leaching of ...

Microwave Thermal Prereduction with Carbon and Leaching of Chromite Ore Fines. ... prereduction, and smelting of Greek chromite ores and concentrates [J]. Ironmaking and ... Guo S., Peng J., Zhang L. (2016) Microwave Thermal Prereduction with Carbon and Leaching of Chromite Ore Fines. In: Hwang JY. et al. (eds) 7th International Symposium on ...

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leaching process for chromite Minevik

leaching process for chromite A clean and efficient leaching process for chromite ore. A clean and efficient leaching process for chromite ore.. In order to improve the chromate salts cleaner production technology, a pressure leaching process for chromite ore in 50. and a clean and efficient leaching process for chromite ore was developed.

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Leaching and recovery of platinum group metals from UG …

Existing processes for the recovery of platinum group metals (PGM) from UG2 ores place stringent requirements with regard to chromite content upon feed material to the plant. An alternative hydrometallurgical process for which this is not an issue is proposed that involves reductive roasting of the ore followed by leaching with

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(PDF) Sulfuric acid leaching of Turkish chromite concentrate

A new leaching process for preparing chromium oxide from chromite was studied for this paper, using Cr(VI) extracted from the remediation treatment of chromite ore processing residue (COPR) as an ...

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Preventing Chromium Leaching

In this case, high chromium leachability is desired and is aided by the addition of lime to a mixture of chromite ore and Na2CO3. The CaONa2CO3 ore mixture is roasted at 1,100° to 1,150° C in an oxidizing air atmosphere, followed by water leaching of the roasted material to extract the chromium as Na2CrO4 in solution.

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Sulfuric acid leaching kinetics of South African chromite ...

The sulfuric acid leaching kinetics of South African chromite was investigated. The negative influence of a solid product layer constituted of a siliconrich phase and chromiumrich sulfate was eliminated by crushing the chromite and by selecting proper leaching conditions.

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Miner. Eng. CORE

During the leaching process, other accompanying elements such as aluminum and silicon were extracted out from the chromite ore as well. However, their leaching products easily formed a compound of potassium aluminosilicate and therefore precipitated into the leaching residue.

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WO1997046724A1 Process for obtaining chromium enriched ...

A process for obtaining chromium enriched chromite from chromite ores comprising the steps of: dry chlorinating the ores at a temperature between 400 °C and 750 °C to produce a chlorinated substrate containing acid soluble ferric oxide, acid soluble ferric chloride and acid insoluble chromium enriched chromite; digesting the chlorinated substrate with hydrochloric acid to dissolve the ferric ...

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(PDF) Preparation of Potassium Dichromate Crystals from ...

It was also found that during the leaching process, the alkaline insoluble iron (Fe) and magnesium (Mg) in the chromite ore remains in the residue in the form of magnesium hydroxide (Mg(OH)2) and ...

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Chromate and dichromate Wikipedia

The primary chromium ore is the mixed metal oxide chromite, FeCr 2 O 4, found as brittle metallic black crystals or granules. Chromite ore is heated with a mixture of calcium carbonate and sodium carbonate in the presence of air. The chromium is oxidized to the …

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A clean and efficient leaching process for chromite ore ...

In order to improve the chromate salts cleaner production technology, a pressure leaching process for chromite ore in 50 wt% KOH solution was studied for the first time and the results were presented in …

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leaching process for chromite

Treatability of chromite ore processing waste by leaching. 20171030 · is subjected to a roasting process with sodium carbonate and calcium carbonate at high temperatures with excess oxygen. During the course of monochromate produc Treatability of chromite ore processing waste by leaching Waste Management Research.

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(PDF) Leaching Mechanisms of Cr(VI) from Chromite Ore ...

Batch leaching tests, qualitative and quantitative xray powder diffraction (XRPD) analyses, and geochemical modeling were used to investigate the leaching mechanisms of Cr(VI) from chromite ore ...

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Comparative study of alkali roasting and leaching of ...

Comparative study of alkali roasting and leaching of chromite ores and titaniferous minerals Stephen Parirenyatwa⁎, Lidia EscuderoCastejon⁎, Sergio SanchezSegado, Yotamu Hara, Animesh Jha Institute of Materials Research, Houldsworth Building, University of Leeds, Leeds LS2 9JT, UK

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(Bio)leaching Behavior of Chromite Tailings

Chromite beneficiation operations in Sukinda valley (India) produce large amounts of tailings, which are stored in open air. In this study, bioleaching experiments were carried out in batch reactors with Acidithiobacillus thiooxidans or Pseudomonas putida in order to determine the potential leachability of metals contained in these tailings due to biological activity.

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Comparative study of alkali roasting and leaching of ...

Comparison of alkali roasting and leaching of chromite ores and titaniferous minerals was carried out • Roasting temperature and time were studied using KOH and NaOH salts for both minerals • 95% of chromium recovery was achieved by roasting with NaOH and KOH at 1000 °C and subsequent water leaching •

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Extraction of Chromium from Chromite Ore

Table of ContentsOre SamplesChromite Ore ProcessingShaker Table Concentration of Dry Crushed OreChromium Ore MetallurgyConclusions Chromium has a wide variety of applications in the modern world. Its major uses are in stainless steels and the plating of metals. Other important uses include alloy steel, heating elements, pigments, leather processing, catalysts, and refractories. Of the chromite ...

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Acid leaching of chromite ScienceDirect

Pressure leaching using sulphurie acid to dissolve chromite ore was investigated. The most favourable conditions 605 606 E VARDAR ~'I dl for sulphuric acid leaching of chromite to extract chromium was at 250, lbr 30 rain., using 50% H2SO4 (by weight) and chromite ore of particle size less than 64 ~m.

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leaching process for chromite

A clean and efficient leaching process for chromite ore ScienceDirect. Mar 18, 2014 ... In order to improve the chromate salts cleaner production technology, a pressure leaching process for chromite ore in 50 wt% KOH solution...

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Chromium Wikipedia

For the production of pure chromium, the iron must be separated from the chromium in a two step roasting and leaching process. The chromite ore is heated with a mixture of calcium carbonate and sodium carbonate in the presence of air. The chromium is oxidized to the hexavalent form, while the iron forms the stable Fe 2 O 3.

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A clean and efficient leaching process for chromite ore ...

Request PDF on ResearchGate | On Jun 1, 2014, Gang Chen and others published A clean and efficient leaching process for chromite ore

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