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Treatment of chromite ore processing residue by pyrolysis
Chromite Ore Processing Residue (COPR) is the byproduct of chromate production process, which contains a large amounts of Cr(VI). The present work developed a new technique to treat COPR, and the process involved mixing the COPR with limestone straw followed by pyrolysis. It was found that the gaseous or
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Treatment of Chromite Ore-Processing Solid Waste Using a
Treatment of Chromite Ore-Processing Solid Waste Using a Ferrous Iron-Based Reductant Problem Definition . Chromite ore-processing solid waste generated from ferrochrome alloy production can act as a major source of hexavalent chromium (Cr[VI]) to ground water. A large volume of chromite ore-processing solid waste, consisting
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A new method for the treatment of chromite ore
Chromite ore processing residue (COPR), derived from the so-called high-lime processing of chromite ore, contains a significant fraction of a leachable Cr(VI) which is harmful to human being and other organisms. In recent years, the concern over environmental pollution from the waste residue contain
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Methods of treatment of chromite ore processing residue
US-8192705-B2 chemical patent summary.
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A new method for the treatment of chromite ore
Oct 22, 2007A new method for the treatment of COPR was investigated. By mixing COPR with the solution of sucrose, starch or slurry and calcinating the mixers at 500–600 °C under inertial gas CO 2 protection, Cr (VI) in COPR can be reduced completely into Cr (III).
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TREATMENT OF HEXAVALENT CHROMIUM IN CHROMITE ORE
Nov 01, 2005Description: We developed a method for disseminating ferrous iron in the subsurface to enhance chemical reduction of hexavalent chromium (Cr (VI)) in a chromite ore processing solid waste derived from the production of ferrochrome alloy.
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US 7670576 B2 Methods Of Treatment Of Chromite Ore
The Lens serves almost all the patents and scholarly work in the world as a free, open and secure digital public good, with user privacy a paramount focus.
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US Patent for Methods of treatment of chromite ore
Justia Patents Forming Insoluble Substance In Liquid US Patent for Methods of treatment of chromite ore processing residue Patent (Patent # 7,670,576) Methods of treatment of chromite ore processing residue . Sep 7, 2005 Redox Solutions, LLC. Methods to reduce hexavalent chromium (Cr(VI)) in chromite processing wastes include one or more of
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Long-term treatment issues with chromite ore processing
May 17, 2007A pugmill treatability study was conducted to remediate chromite ore processing residue (COPR) using ferrous sulfate heptahydrate (FeSO 4 7H 2 O) as a reductant. Two different types of COPR, with respect to particle size and mineralogy, were tested in this study.
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A new method for the treatment of chromite ore
Chromite ore processing residue (COPR) is a waste produced in 12 high lime chromium salt production process using chromite ( (Mg, 13 Fe) (Cr, Al) 2
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Treatment of chromite ore processing residue by pyrolysis
Chromite Ore Processing Residue (COPR) is the byproduct of chromate production process, which contains a large amounts of Cr(VI). The present work developed a new technique to treat COPR, and the process involved mixing the COPR with limestone straw followed by pyrolysis. It was found that the gaseous or
Contact
A new method for the treatment of chromite ore processing
Chromite ore processing residue (COPR), derived from the so-called high-lime processing of chromite ore, contains a significant fraction of a leachable Cr(VI) which is harmful to human being and other organisms. In recent years, the concern over environmental pollution from the waste residue contain
Contact
Treatment of Chromite Ore-Processing Solid Waste Using a
Treatment of Chromite Ore-Processing Solid Waste Using a Ferrous Iron-Based Reductant Problem Definition . Chromite ore-processing solid waste generated from ferrochrome alloy production can act as a major source of hexavalent chromium (Cr[VI]) to ground water. A large volume of chromite ore-processing solid waste, consisting
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(PDF) Treatment of chromite ore processing residue using
PDF On Jan 1, 2010, J.A. Velasco and others published Treatment of chromite ore processing residue using sodium sulfide. Hazardous and industrial waste
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Methods of treatment of chromite ore processing residue
US-8192705-B2 chemical patent summary.
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A new method for the treatment of chromite ore processing
Oct 22, 2007The chromite components are oxidized according to the following reaction: (1) 2FeCr 2 O 4 + 4Na 2 CO 3 + 3.5O 2 → 4Na 2 CrO 4 + Fe 2 O 3 + 4CO 2 (2) MgCr 2 O 4 + 2Na 2 CO 3 + 1.5O 2 → 2Na 2 CrO 4 + MgO + 2CO 2 The use of dolomite as a filler results in a large quantity of waste—chromite ore processing residues (COPR), sometimes as much as
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US 7670576 B2 Methods Of Treatment Of Chromite Ore
The Lens serves almost all the patents and scholarly work in the world as a free, open and secure digital public good, with user privacy a paramount focus.
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US Patent for Methods of treatment of chromite ore
Justia Patents Forming Insoluble Substance In Liquid US Patent for Methods of treatment of chromite ore processing residue Patent (Patent # 7,670,576) Methods of treatment of chromite ore processing residue . Sep 7, 2005 Redox Solutions, LLC. Methods to reduce hexavalent chromium (Cr(VI)) in chromite processing wastes include one or more of
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TREATMENT OF HEXAVALENT CHROMIUM IN CHROMITE ORE
Nov 01, 2005su, c. and r ludwig*. treatment of hexavalent chromium in chromite ore processing solid waste using a mixed reductant solution of ferrous sulfate and sodium dithionite. environmental science and technology. john wileysons, ltd.,
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Methods of Treatment of Chromite Ore Processing Residue
Methods of Treatment of Chromite Ore Processing Residue . United States Patent Application 20100087697 . Kind Code: A1 . Abstract: Methods to reduce hexavalent chromium (Cr(VI)) in chromite processing wastes include one or more of the following steps: contacting the chromite processing wastes with an oxygen scavenger or chemical reducer
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Chromium Ore an overview ScienceDirect Topics
The main component of the chromium ore is chromite FeCr 2 O 4. The ores extensively dispersed in natural deposits and generally contaminated with Mg, Si, Al, and O. The chromium metal commercially separated by oxidizing chromite ore to Cr 2 O 3, then the metal is attained by heating the Cr 2 O 3 in the presence of Al or Si [5,6].
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Methods of Treatment of Chromite Ore Processing Residue
Methods of Treatment of Chromite Ore Processing Residue. 8192705 12634728 USPTO Application Dec 10, 2009 Publication Jun 05, 2012 Steven A. Chisick Timothy Clark Heffernan Thomas P. McCullough Gary Joel Meyer. Abstract.
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Promoted electrokinetic treatment of Cr from chromite ore
1. Introduction. Chromite ore processing residue (COPR) is an industrial solid waste generated in chromium salt production, which is a hazardous waste because of the high content of Cr,.Chromium (Cr) pollution is a global environmental problem mainly due to inappropriate management and indiscriminate disposal, especially Cr(Ⅵ), with high toxicity and
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Long-term treatment issues with chromite ore processing
May 17, 20071.. IntroductionAlkaline (pH > 12) chromite ore processing residue (COPR) is derived from the roasting of chromite ore mixed with soda ash and slaked lime at ∼1200 °C to oxidize Cr 3+ and sequester impurities. The end products are soluble sodium chromate and the solid COPR that mainly consists of brownmillerite (Ca 2 FeAlO 5), periclase (MgO) and excess
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Treatment of chromite ore processing residue by pyrolysis
Chromite Ore Processing Residue (COPR) is the byproduct of chromate production process, which contains a large amounts of Cr(VI). The present work developed a new technique to treat COPR, and the process involved mixing the COPR with limestone straw followed by pyrolysis. It was found that the gaseous or
Contact
A new method for the treatment of chromite ore processing
Chromite ore processing residue (COPR), derived from the so-called high-lime processing of chromite ore, contains a significant fraction of a leachable Cr(VI) which is harmful to human being and other organisms. In recent years, the concern over environmental pollution from the waste residue contain
Contact
Treatment of Chromite Ore-Processing Solid Waste Using a
Treatment of Chromite Ore-Processing Solid Waste Using a Ferrous Iron-Based Reductant Problem Definition . Chromite ore-processing solid waste generated from ferrochrome alloy production can act as a major source of hexavalent chromium (Cr[VI]) to ground water. A large volume of chromite ore-processing solid waste, consisting
Contact
(PDF) Treatment of chromite ore processing residue using
PDF On Jan 1, 2010, J.A. Velasco and others published Treatment of chromite ore processing residue using sodium sulfide. Hazardous and industrial waste
Contact
Methods of treatment of chromite ore processing residue
US-8192705-B2 chemical patent summary.
Contact
A new method for the treatment of chromite ore processing
Oct 22, 2007The chromite components are oxidized according to the following reaction: (1) 2FeCr 2 O 4 + 4Na 2 CO 3 + 3.5O 2 → 4Na 2 CrO 4 + Fe 2 O 3 + 4CO 2 (2) MgCr 2 O 4 + 2Na 2 CO 3 + 1.5O 2 → 2Na 2 CrO 4 + MgO + 2CO 2 The use of dolomite as a filler results in a large quantity of waste—chromite ore processing residues (COPR), sometimes as much as
Contact
US 7670576 B2 Methods Of Treatment Of Chromite Ore
The Lens serves almost all the patents and scholarly work in the world as a free, open and secure digital public good, with user privacy a paramount focus.
Contact
US Patent for Methods of treatment of chromite ore
Justia Patents Forming Insoluble Substance In Liquid US Patent for Methods of treatment of chromite ore processing residue Patent (Patent # 7,670,576) Methods of treatment of chromite ore processing residue . Sep 7, 2005 Redox Solutions, LLC. Methods to reduce hexavalent chromium (Cr(VI)) in chromite processing wastes include one or more of
Contact
TREATMENT OF HEXAVALENT CHROMIUM IN CHROMITE ORE
Nov 01, 2005su, c. and r ludwig*. treatment of hexavalent chromium in chromite ore processing solid waste using a mixed reductant solution of ferrous sulfate and sodium dithionite. environmental science and technology. john wileysons, ltd.,
Contact
Methods of Treatment of Chromite Ore Processing Residue
Methods of Treatment of Chromite Ore Processing Residue . United States Patent Application 20100087697 . Kind Code: A1 . Abstract: Methods to reduce hexavalent chromium (Cr(VI)) in chromite processing wastes include one or more of the following steps: contacting the chromite processing wastes with an oxygen scavenger or chemical reducer
Contact
Chromium Ore an overview ScienceDirect Topics
The main component of the chromium ore is chromite FeCr 2 O 4. The ores extensively dispersed in natural deposits and generally contaminated with Mg, Si, Al, and O. The chromium metal commercially separated by oxidizing chromite ore to Cr 2 O 3, then the metal is attained by heating the Cr 2 O 3 in the presence of Al or Si [5,6].
Contact
Methods of Treatment of Chromite Ore Processing Residue
Methods of Treatment of Chromite Ore Processing Residue. 8192705 12634728 USPTO Application Dec 10, 2009 Publication Jun 05, 2012 Steven A. Chisick Timothy Clark Heffernan Thomas P. McCullough Gary Joel Meyer. Abstract.
Contact
Promoted electrokinetic treatment of Cr from chromite ore
1. Introduction. Chromite ore processing residue (COPR) is an industrial solid waste generated in chromium salt production, which is a hazardous waste because of the high content of Cr,.Chromium (Cr) pollution is a global environmental problem mainly due to inappropriate management and indiscriminate disposal, especially Cr(Ⅵ), with high toxicity and
Contact
Long-term treatment issues with chromite ore processing
May 17, 20071.. IntroductionAlkaline (pH > 12) chromite ore processing residue (COPR) is derived from the roasting of chromite ore mixed with soda ash and slaked lime at ∼1200 °C to oxidize Cr 3+ and sequester impurities. The end products are soluble sodium chromate and the solid COPR that mainly consists of brownmillerite (Ca 2 FeAlO 5), periclase (MgO) and excess
Contact