• Comparative study of alkali roasting and leaching of ...

    Oct 01, 2016· At 1000 °C, chromite ore reacted to a significant extent with alkali and most chromium was extracted as sodium or potassium chromate by water leaching. The wt.% of Cr 2 O 3 decreased from % in the asreceived chromite sample to % and % in the water leached residues after roasting with sodium and potassium hydroxides, respectively.

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  • Bioleaching for Removal of Chromium and Associated Metals ...

    The ability of Acidithiobacillus ferrooxidans to remove chromium and other metals from LD slag was examined. Additionally the option to retrieve P from LD slag was evaluated. Due to the facts that A. ferrooxidans is a facultative anaerobic microorganism and LD slag is an alkaline and oxidic material, both oxidative and reductive bioleaching experiments were carried out.

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  • How to process Chrome ore with Mining equipment? JXSC ...

    The selection of chrome ore mining equipment is closely related to the physical and chemical properties of chromium ore. Because chromite is weakly magnetic, with the continuous improvement of high intensity magnetic separation technology, the technology of purifying chromium ore with high intensity magnetic separation has been very mature.

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  • Chemical Engineering Journal EURELCO

    Heap leaching Heap leaching is traditionally used in the mining industry to extract (precious) metals from lowgrade ores [25]. In the mining industry, these lowgrade ores are excavated, agglomerated and heaped on an impermeable liner. The ore is then sprinkled with a leach solution for a period of one month up to two years, depend

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  • Roasting And Leaching Processess For Chromium

    Heap heap leaching of chromium ore. Heap leaching is an industrial mining method to dig out precious metals and copper compounds from ore process of heap leaching the mined ore is crushed into tiny chunks and heaped on an impermeable plastic andor clay lined leach pad where it may be irri...

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  • Leaching of hexavalent chromium from young chromite ore ...

    Chromite ore processing residue (COPR) is a waste derived from the chromate extraction from roasted ores and is deposited in some countries in landfills. The objective of this study was to investigate the leaching characteristics of hexavalent Cr [Cr(VI)] from two COPR samples obtained from unlined landfills in the Kanpur area of northern India.

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  • Preventing Chromium Leaching

    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. The extract solution is acidified and purified, and the chromium is recovered by …

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  • The Development of Nickel Laterite Heap Leach Projects Rev 0

    More extensive development work on heap leaching and metal recovery from solution was undertaken by BHP Billiton, who applied acid agglomeration to a range of nickel laterite ores, including limonites, saprolites and fine clay bearing ores9. They also introduced the concept of twostage heap leaching, using a lead and a lag heap. An important

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  • Why South Africa Chrome Ore are Acclaimed in the Cast ...

    The series of chromium ore products mainly include South African foundry grade, chemical grade, refractory grade, metallurgical grade chromium ore, Indian refractory and metallurgical grade chromium ore, Philippines chromium ore and other ore products from many them, South African foundry grade chrome ore sells well in more than 20 provinces and cities across the China and has ...

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  • Microbial Leaching of Uranium Ore

    uranium heap leaching process on a commercial scale. This is an early turning point in the microbiological leaching of uranium ores. Harrison et al. (1966) reported the role of th e iron oxidizing Acidithiobacillus ferrooxidans in leaching of uranium. The uranium ore was st acked in heaps, similar to dump leaching of

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  • Leaching behaviour of a chromium smelter waste heap ...

    Jun 01, 2001· The dominant cations at the leachate emergence (Location 1) were Na + ( to mM) and Ca 2+ (– mM) and the dominant anions were SO 4 2− (– mM), CO 3 2− (– mM) and CrO 4 2−.The fluids were hyperalkaline ( the leachate emergence pH was between and ).The pH at the leachate emergence fell towards the end of the sampling period.

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  • Iran Pilot Copper Ore Heap Leach

    Heap Leaching Of Chromium Ore. Investigation into the heap leaching of copper ore from Heap leaching of malachiteatacamite ores with high silica gangue using process for mining of chromium . An alternative to heap Chromium was found to be pilot plant heap leach studies on alda ore . .

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  • Lateritic nickel ore deposits Wikipedia

    Heap leach treatment of nickel laterites is primarily applicable to claypoor oxiderich ore types where clay contents are low enough to allow percolation of acid through the heap. Generally, this route of production is much cheaper up to half the cost of production due to the lack of need to heat and pressurise the ore and acid.

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  • Leaching behaviour of a chromium smelter waste heap ...

    Jun 01, 2001· Leaching behaviour of a chromium smelter waste heap. Author links open overlay panel D Deakin a West a Stewart b B ... The residual ore is unreactive and it is likely that unleached chromate is the main source of chromate within leachates, although the chemical speciation of this solid phase chromate remains unknown. ... Cheng, P ...

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