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new processing technology of chromite ore

A new metallurgical process for the clean utilization of ...

2014-9-10  In this new technology, chromite ore was dissolved in 80 wt.% KOH sub-molten salt solution at 320 °C, and the chromium extraction surpassed 99% after 8 h reaction. Moreover, the amount of discharged residue was further decreased to 0.5 ton per ton of chromate salts which was about 60% of the residue amount from the developed lime-free roasting ...

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Green metallurgical processing of chromite - ScienceDirect

2006-8-1  A new green metallurgical process for chromite ore has been proposed and developed to solve the serious environmental problem in the traditional production process of chromate. In the new process, the oxidation of chromite ore is carried out in sub-molten potassium hydroxide at 300 °C. Compared with the traditional roasting process in a rotary ...

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Development of a new cleaner production process for ...

2006-1-1  4. Improvements and innovations in the new cleaner process4.1.. Simpler reaction system for the oxidation of chromite oreIn the traditional process, the oxidation of chromite ore occurs in the presence of sodium carbonate (Na 2 CO 3) and other additives including limestone and dolomite.When the temperature increases as high as 1100 °C, these additives will decompose and react with sodium ...

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Towards holistic technology solution to chromite ore ...

2021-1-4  Overview of chromite ore processing. Chromite ore FeOCr 2 O 3 is a major ore for Chromium. India accounts for about 10% of world share of shipping grade Chromium ore reserves, having 45% Cr 2 O 3 content. South Africa and Zimbabwe and India are the Top five countries of Chrome ore processing industries in the Word (Indian Minerals Year Book 2016). ...

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S A Extraction Metallurgy Process For Chromite Ore Mining

Chromium Processing. 201981 Chromium processing, preparation of the ore for use in various products. Chromium Cr is a brilliant, hard, refractory metal that melts at 1,857 C 3,375 F and boils at 2,672 C 4,842 F. In the pure state it is resistant to ordinary corrosion, resulting in its application as an electroplated.

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Processing of Low-Grade Chromite Ore for Ferroalloy ...

2020-7-14  The low-grade siliceous chromite ore from Ghutrigaon, Odisha, India, containing ~ 16% Cr2O3, with Cr/Fe ratio of 1.97 and ~ 55% of SiO2, does not find any use in metallurgical industry and hence considered as waste. Mineralogical investigation indicates the presence of chromite and quartz as major minerals with minor fuchsite and kaolinite. The beneficiation studies reveal that the product can ...

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Chromite- mineralogy and processing - ScienceDirect

1988-1-1  Podiform chromite may occur as either high-grade massive, or low-grade Chromite--mineralogy and processing 237 disseminated ore, although the amount of massive ore mined has decreased during this century. Currently the grades vary from 28-30% Cr203 in Turkey to 43% Cr203 in Albania [4]. MINERALOGY Composition and texture Chromite belongs to the ...

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New aspect of chromite gravity tailings re-processing

Chromite ore processing tailing, a solid waste generated during the processing of chromite ore, is difficult to recover due to its ultra-fine size. The tailings generated from the process contains ...

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(PDF) Characterization of Chromite Ore Processing Residue

2007-10-1  John M Senko. Chromite ore processing residue (COPR) is a waste byproduct of chromate production that contains high levels of hexavalent chromium (Cr [VI]). Although the high temperature chromite ...

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Green metallurgical processing of chromite - ScienceDirect

2006-8-1  A new green metallurgical process for chromite ore has been proposed and developed to solve the serious environmental problem in the traditional production process of chromate. In the new process, the oxidation of chromite ore is carried out in sub-molten potassium hydroxide at 300 °C. Compared with the traditional roasting process in a rotary ...

More

New aspect of chromite gravity tailings re-processing

Chromite ore processing tailing, a solid waste generated during the processing of chromite ore, is difficult to recover due to its ultra-fine size. The tailings generated from the process contains ...

More

S A Extraction Metallurgy Process For Chromite Ore Mining

Chromium Processing. 201981 Chromium processing, preparation of the ore for use in various products. Chromium Cr is a brilliant, hard, refractory metal that melts at 1,857 C 3,375 F and boils at 2,672 C 4,842 F. In the pure state it is resistant to ordinary corrosion, resulting in its application as an electroplated.

More

Chromite- mineralogy and processing - ScienceDirect

1988-1-1  Podiform chromite may occur as either high-grade massive, or low-grade Chromite--mineralogy and processing 237 disseminated ore, although the amount of massive ore mined has decreased during this century. Currently the grades vary from 28-30% Cr203 in Turkey to 43% Cr203 in Albania [4]. MINERALOGY Composition and texture Chromite belongs to the ...

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Conversion of Chromium Ore Processing Residue to

2019-3-1  Conversion of Chromium Ore Processing Residue to Chrome Steel Introduction Chromium played an important role in the industrial development of New Jersey from 1905 to 1971. During that period, chromate (Cr6+) was produced from chromite ore at three facilities in Hudson County, NJ.

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Extraction of Chromium from Chromite Ore

2017-7-20  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 techniques. Flotation using known

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A New Method (Ball Milling and Sodium Sulfide) for ...

2021-8-5  1. Introduction. The soda ash roasting process produces Chromite Ore Processing Residue (COPR) containing 1130–8500 mg/kg carcinogenic hexavalent chromium (Cr(VI)) due to the industrial incomplete leaching (Du and Chrysochoou, 2018, Chrysochoou et al., 2009).Compared with the lime-based roasting process, soda ash as the complexing agent generates 3 times less residue; thus, the new

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(PDF) Characterization of Chromite Ore Processing Residue

2007-10-1  John M Senko. Chromite ore processing residue (COPR) is a waste byproduct of chromate production that contains high levels of hexavalent chromium (Cr [VI]). Although the high temperature chromite ...

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Chromium steel from chromite ore processing residue — A ...

2011-5-7  As species we humans generate excessive amounts of waste and hence for sustainability we should explore innovative ways to recover them. The primary objective of this study is to demonstrate an efficient and optimum way to recover chromium and iron from chromite ore processing residues (COPR) for the production of chrome steel and stainless steel. In Hudson County, New Jersey, there are more ...

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Reductive Treatment of Chromite Ore Processing Residue ...

2012-6-20  A bench- and pilot-scale treatability study conducted on Chromite Ore Processing Residue (COPR) from a deposition site in New Jersey showed that regulatory compliance to 20 (current) or 240 (up to 2006) mg/kg Cr(VI) was not possible using several common reductants (zero valent iron, pyrite, ferrous sulfate) due to the slow release of Cr(VI) from the binding minerals and the competing

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Green Metallurgical Processing of Chromite Request PDF

A new green metallurgical process for chromite ore has been proposed and developed to solve the serious environmental problem in the traditional production process of chromate. In the new process ...

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Chromite ore processing residue in Hudson County, New ...

1991-5-1  Chromite ore processing residue occurs at over 130 sites in Hudson County, New Jersey. Many of these sites are in urban residential areas. This waste is a result of 70 years of chromate and bichromate chemical manufacturing. At least 15% of the sites contain total chromium concentrations greater than 10,000 mg/kg, with hexavalent content ranging from about 1 to 50%. Continuing leaching

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Chromite Beneficiation Process

2016-4-12  Chromite Grinding. The 36″x 8′ Adjustable Stroke Ore Feeder is used to accurately control feed of crushed ore to the grinding section. Before it is fed to the 4’x 8′ Peripheral Discharge Rod Mill, the minus ¼” chrome ore is removed from the grinding

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Chromium steel from chromite ore processing residue — A ...

2011-5-7  As species we humans generate excessive amounts of waste and hence for sustainability we should explore innovative ways to recover them. The primary objective of this study is to demonstrate an efficient and optimum way to recover chromium and iron from chromite ore processing residues (COPR) for the production of chrome steel and stainless steel. In Hudson County, New Jersey, there are more ...

More

(PDF) Characterization of Chromite Ore Processing Residue

2007-10-1  John M Senko. Chromite ore processing residue (COPR) is a waste byproduct of chromate production that contains high levels of hexavalent chromium (Cr [VI]). Although the high temperature chromite ...

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Identification and Description of Mineral Processing ...

2016-3-27  If the chromite mineral occurs in fine grains intermixed with host rock, crushing, gravity separation and magnetic separation may be used.9 Chromite ore is typically beneficiated before it is sold, hence many of these operations may not be conducted in the United States. 10 Exhibit 2 is a conceptual diagram of chromite ore processing.

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Characterization of Chromite Ore Processing Residue ...

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.

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Reductive Treatment of Chromite Ore Processing Residue ...

2012-6-20  A bench- and pilot-scale treatability study conducted on Chromite Ore Processing Residue (COPR) from a deposition site in New Jersey showed that regulatory compliance to 20 (current) or 240 (up to 2006) mg/kg Cr(VI) was not possible using several common reductants (zero valent iron, pyrite, ferrous sulfate) due to the slow release of Cr(VI) from the binding minerals and the competing

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chromium processing Britannica

2021-11-1  chromium processing, preparation of the ore for use in various products. Chromium (Cr) is a brilliant, hard, refractory metal that melts at 1,857 °C (3,375 °F) and boils at 2,672 °C (4,842 °F). In the pure state it is resistant to ordinary corrosion,

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Green Manufacturing Process of Chromium Compounds

technologies, as well as many other new technologies [8–12], of the chromium compounds production were developed, the pollution problem has not been thor-oughly resolved [4]. Recently, a green manufacturing process for chro-mium compounds has been developed by the Institute of Process Engineering, Chinese Academy of Sciences [13–16].

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