history of chromite ore processing

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Green manufacturing process of chromium compounds - Zhang ,

Green manufacturing process of chromium compounds - Zhang ,

Nov 19, 2004· In addition, aluminum in chromite ore can be extracted and recovered in the green process as aluminum hydroxide [Al(OH) 3] Thus, the comprehensive use of all valuable elements (Cr–Al–Mg–Fe) in chromite ore and the zero emission of chromium‐containing toxic waste are achieved in the green process Production of Chromic Oxide

Extraction of Chromium from Chromite Ore

Extraction of Chromium from Chromite Ore

Jul 20, 2017· Chromite Ore Processing Low-grade ore obtained from an open cut trench at a chromite deposit near Auburn, Calif, was treated in the laboratory using gravity-magnetic separation and flotation beneficiation techniqu Flotation using known methods, however, gave very poor results and will not be discussed further in this report Tabling of the .

Chromium Cleanup Partnership

Chromium Cleanup Partnership

Chromite mining - The Oregon Encyclopedia

Chromium Ore Processing Residue - Maryland

Chromium Ore Processing Residue - Maryland

Chromium Ore Processing Residue (COPR) Site Initiative Background and Site Location The reduction of chrome bearing ores in the production of industrial grade chromium compounds results in a waste rich in metals contamination This byproduct is variously referred to as chromite ore processing

Leaching of Valuable Elements from the Waste Chromite Ore ,

Leaching of Valuable Elements from the Waste Chromite Ore ,

chromite ore processing residue (COPR) is an inevitable solid emission in chromite salt production It is an industrial waste produced during the extraction of Cr(VI) from a chromite ore using the high-temperature roasting process11 In general, the COPR is alkaline (pH >12),5 ,7 and because of the presence of partially water-soluble .

Thermodynamics of chromite ore oxidative roasting process ,

Thermodynamics of chromite ore oxidative roasting process ,

The results indicate that Na 2 CrO 4 can be formed easily via the reaction of Na 2 CO 3 with chromite ore Na 2 OFe 2 O 3, Na 2 OAl 2 O 3 and Na 2 OSiO 2 can be formed as intermediate compounds in the roasting process and they can further react with chromite ore to form Na 2 CrO 4

Technology Innovations in the Smelting of Chromite Ore

Technology Innovations in the Smelting of Chromite Ore

chromite ore have spurred the innovations in the technologies used for smelting chromite ore These technologies (Conventional smelting process, Outokumpu process, DC arc route, and Premus process) have been reviewed in this work Premus process has been found to be the lowest-cost and most energy-efficient ferrochrome smelting

Chromite Ore - Characterisation Through to Processing

Chromite Ore - Characterisation Through to Processing

A South African chromite sample was subjected to characterisation and physical beneficiation testwork in order to assess its suitability to produce an upgraded chromite product with a silica level of 12),5 ,7 and because of the presence of partially water-soluble .

Case Study: Chromite mining and processing

Case Study: Chromite mining and processing

Chromium mining and processing In nature, chromium is found as chromite ore, composed of elemental iron, oxygen and chromium (FeOCr 2 O 3) 1,2 heavily in about a 700 m vicinity around the Countries with commercially significant chromite mines include Russia, South Africa, Zimbabwe, Turkey, the Philippines and India2 Chromite ore is initially

The soda-ash roasting of chromite ore processing residue ,

The soda-ash roasting of chromite ore processing residue ,

Sodium chromate is produced via the soda-ash roasting of chromite ore with sodium carbonate After the reaction, nearly 15 pct of the chromium oxide remains unreacted and ends up in the waste stream, for landfills In recent years, the concern over environmental pollution from hexavalent chromium (Cr6+) from the waste residue has become a major problem for the chromium chemical industry

PGM Ore Processing at Impala's UG-2 Concentrator

PGM Ore Processing at Impala's UG-2 Concentrator

whole had developed improved processing practic Strategically it became apparent that an increased amount of UG2 ore would have to be processed to maintain overall PGM output, as the existing reserves of Merensky reef low in chromite were slowly being depleted while ,

Leaching of hexavalent chromium from young chromite ore ,

Leaching of hexavalent chromium from young chromite ore ,

Mar 18, 2020· 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

Chromite - Wikipedia

Chromite - Wikipedia

Aug 01, 2006· 1 IntroductionChromate production from chromite ore is an important basic metallurgical process but is usually a source of severe pollution The traditional chromate production process used in China presently consists of three procedures: roasting of chromite ore, water leaching, and multi-stage evaporation and crystallization

Mineral processing - Wikipedia

Mineral processing - Wikipedia

In the field of extractive metallurgy, mineral processing, also known as ore dressing, is the process of separating commercially valuable minerals from their ores Contents 1 History

Chromium Cleanup Partnership

Chromium Cleanup Partnership

1905-1911 Chromite ore processing begins in Hudson County With its proximity to one of America's busiest ports, Hudson County becomes a center for chrome production because most of the world's chrome reserves are located outside the United Stat

Identification and Description of Mineral Processing ,

Identification and Description of Mineral Processing ,

Chromite ore is prepared for processing using several methods, depending on the ore source and the end use requirements Course clean ore is hand sorted, while fine clean ore is gravity separated Lumpy ore mixed with host rock may require heavy-media separation If the chromite mineral occurs in fine grains intermixed with host rock, crushing.

Treatment of Chromite Ore-Processing Solid Waste Using a

Treatment of Chromite Ore-Processing Solid Waste Using a

A large volume of chromite ore-processing solid waste, consisting of slag, conditioning tower sludge, and electrostatic precipitator dust and measuring approximately 20 acre-feet in size, is present in the saturated zone at the Macalloy Corporation site in Charleston, South Carolina

Green Manufacturing Process of Chromium Compounds

Green Manufacturing Process of Chromium Compounds

chromite ore The essence of the green process is that traditional oxidation roasting of chromite ore with so-dium carbonate at 1200° C is replaced by continuous liquid-phase oxidation of chromite ore in the submol-ten salt medium at 300° C in a multiphase reactor BRIEF DESCRIPTION OF THE TRADITIONAL PROCESS

Process optimization of a chrome ore gravity concentration ,

Process optimization of a chrome ore gravity concentration ,

Chromite deposits occur in the form of discontinuous bands, lenses, and pockets in different host rock associations Chrome ore beneficiation Most of the chrome ores around the world are beneficiated by gravity concentration techniqu A conventional chromite ore beneficiation process plant (Figure 3) consist of two sections:

Characterization of chromite ore processing residue — New ,

Characterization of chromite ore processing residue — New ,

N2 - This paper summarizes the characteristics of chromite ore processing residue (COPR) in terms of their chemical compositions, phases, and recycling potential of iron and chromium through preliminary magnetic separation COPR from nine hazardous waste sites in Hudson County, NJ, were analyzed using nondestructive instruments including .

Microstructural Analyses of Cr(VI) Speciation in Chromite ,

Microstructural Analyses of Cr(VI) Speciation in Chromite ,

The speciation and distribution of Cr(VI) in the solid phase was investigated for two types of chromite ore processing residue (COPR) found at two deposition sites in the United States: gray-black (GB) granular and hard brown (HB) cemented COPR COPR chemistry and mineralogy were investigated using micro-X-ray absorption spectroscopy and micro-X-ray diffraction, complemented by laboratory .

Chromite Ore Processing Residue (COPR): Hazardous ,

Chromite Ore Processing Residue (COPR): Hazardous ,

Dermatas, D, Bonaparte, R, Chrysochoou, M, and Moon, H," ChromiteOre Processing Residue (COPR): Hazardous Contaminated Soil or Solid Waste," Journal of ASTM International, Vol 3, No 7, pp 1-10 Chromite ore processing residue (COPR), which contains hexavalent chromium (Cr6+) at concentrations typically in the range of thousands of milligrams/kilograms, was deposited over a ,

Uses of Chromium | Supply, Demand, Production, Resources

Uses of Chromium | Supply, Demand, Production, Resources

Chromite, the only ore of chromium, was first discovered in the United States sometime about 1808 on the farm of Isaac Tyson, Jr, just north of Baltimore, Md Scattered deposits of chromium minerals in an area of northeastern Maryland and southeastern Pennsylvania were the source of nearly all of the chromium products in the world between 1828 .

Reducing energy consumption by alternative processing ,

Reducing energy consumption by alternative processing ,

The carbothermic reduction of chromite ore to produce high carbon ferrochromium is among the most energy intensive metal extraction processes performed, due not only to the highly endothermic nature of the reduction reactions but also the very high operating temperatures required for the smelting operation to separate the chrome-containing alloy from the discard slag

OVERVIEW OF PGM PROCESSING - Anglo American Platinum

OVERVIEW OF PGM PROCESSING - Anglo American Platinum

Union Chromite Recovery Plant PGM Concentrated Residues Tailings Purchased Concentrate Concentrate Furnace Matte Smelting Ore Anglo Converting Process (at Rustenburg) Our configuration differs from our competitors - we have a broad footprint across all 3 Bushveld limbs Consequently, our integrated production system is more complex (ie13

Chemistry and Leaching Behavior of Chromite Ore Processing ,

Chemistry and Leaching Behavior of Chromite Ore Processing ,

Nov 05, 2018· 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 lime-based 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 .

A Brief History of Chromite Smelting

A Brief History of Chromite Smelting

Chromite and FeCr: Leading producing countries (2014) • Chromite ore production –South Africa (12 Mt) –Kazakhstan (37 Mt) –India (35 Mt) –Turkey (26 Mt) •Most of the chromite ore production was smelted in electric-arc furnaces to produce ferrochromium for the metallurgical industry • Ferrochromium production –China (45 Mt)

Chromite: The only mineral ore of chromium metal

Chromite: The only mineral ore of chromium metal

Chromite is important because it is the only economic ore of chromium, an essential element for a wide variety of metal, chemical, and manufactured products Many other minerals contain chromium, but none of them are found in deposits that can be economically mined to produce chromium

Chromium - Wikipedia

Chromium - Wikipedia

Chromium is a chemical element with the symbol Cr and atomic number 24 It is the first element in group 6It is a steely-grey, lustrous, hard, and brittle transition metal Chromium is the main additive in stainless steel, to which it adds anti-corrosive propertiChromium is also highly valued as a metal that is able to be highly polished while resisting tarnishing

Green metallurgical processing of chromite - ScienceDirect

Green metallurgical processing of chromite - ScienceDirect

Aug 01, 2006· 1 IntroductionChromate production from chromite ore is an important basic metallurgical process but is usually a source of severe pollution The traditional chromate production process used in China presently consists of three procedures: roasting of chromite ore, water leaching, and multi-stage evaporation and crystallization

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