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ferrochrome slag trivalent and hexavalent chromium

Hexavalent chromium removal by ferrochromium slag.

Nov 11, 2005 Hexavalent chromium removal by ferrochromium slag. Erdem M(1), Altundoğan HS, Turan MD, Tümen F. Author information: (1)Department of Environmental Engineering, Firat University, 23279 Elaziğ, Turkey. The aim of this study is to demonstrate the potential of Cr(VI) generation during jigging operation applied for ferrochrome recovery from slag.

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(PDF) Hexavalent chromium removal by ferrochromium slag

Efficient adsorption of hexavalent chromium ions onto novel ferrochrome slag/polyaniline nanocomposite: ANN modeling, Isotherms, kinetics and thermodynamic studies

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Hexavalent chromium removal by ferrochromium slag

Chromium contamination of soil and water is a sig-nificant problem since hexavalent form of chromium is highly toxic, mutagenic and potentially carcinogenic to liv-ing organisms [17,18]. The most stable oxidation states of chromium are Cr(III) and Cr(VI) in aqueous systems. The trivalent chromium is quite immobile in the water environ-

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Recovery of Chromium from Ferrochrome Slag JOCPR

Ferrochrome slag may contain chromium in +3 and +6 oxidation states along with elemental chromium[5].Earlier studies reported the extraction of chromium (VI) [6-8] as well as microbial activity of different metals[9].

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Long-term leaching characterization and geochemical

Dec 09, 2019 Chromium released from the AOD slag was primarily presented as trivalent chromium (Cr(III)). The eluate exhibited low hexavalent chromium (Cr(VI)) concentration. As the L/S ratio increased to 115 L kg-1, the accumulated release quantity of Cr(III) and total chromium per AOD slag mass reached 1549.68 and 1613.67 μg kg-1, respectively.

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Chromium Compounds US EPA

Chromium is a naturally occurring element in rocks, animals, plants, soil, and volcanic dust and gases. (1) Chromium occurs in the environment predominantly in one of two valence states: trivalent chromium (Cr III), which occurs naturally and is an essential nutrient, and hexavalent chromium (Cr VI), which, along with

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(PDF) Hexavalent chromium removal by ferrochromium slag

Efficient adsorption of hexavalent chromium ions onto novel ferrochrome slag/polyaniline nanocomposite: ANN modeling, Isotherms, kinetics and thermodynamic studies

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Hexavalent chromium removal by ferrochromium slag

Nov 11, 2005 The chromium content in slags is 2–12%, in oxide and metal form. The slag/metal amount ratio in smelting varies from 1.0 to 1.8, depending on raw materials . Slag is discarded as a waste material in enormous quantities during the ferrochrome production.

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Recovery of Chromium from Ferrochrome Slag JOCPR

Ferrochrome slag may contain chromium in +3 and +6 oxidation states along with elemental chromium[5].Earlier studies reported the extraction of chromium (VI) [6-8] as well as microbial activity of different metals[9].

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Hexavalent Chromium niehs.nih.gov

May 14, 2020 Hexavalent chromium is a form of the metallic element chromium. Chromium is a naturally occurring element found in rocks, animals, plants, soil, and volcanic dust and gases. It comes in several different forms, including trivalent chromium and hexavalent chromium. Trivalent chromium is often referred to as chromium (III) and is proposed to be

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MEDICAL EVALUATION OF CHILDREN AND ADULTS OF THE

chromium and other metals. This slag was used as fill dirt at over 100 known locations in Hudson County, including sites in trivalent and hexavalent, which occur in a variety of chemical compounds. Serious health effects are linked to exposure to and ferrochrome processing (6, 11, 12).

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Toxicological Review of Trivalent Chromium (CAS No. 16065

Chromium (Cr) is a metallic element belonging to the first transitional series of the periodic table. Elemental chromium has a CAS Registry Number of 7440-47-3. The three most stable forms in which chromium occurs in the environment are the 0 (metal and alloys), +3 (trivalent chromium), and +6 (hexavelent chromium) valence states.

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Hexavalent Chromium Overview Occupational Safety and

Hexavalent chromium [Cr (VI)] is one of the valence states (+6) of the element chromium. It is usually produced by an industrial process. Cr (VI) is known to cause cancer. In addition, it targets the respiratory system, kidneys, liver, skin and eyes. Chromium metal is added to alloy steel to increase hardenability and corrosion resistance.

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Journal of Cleaner Production Oulu

1.2. Relevance of hexavalent chromium Chromium can occur in several oxidation states, but only trivalent chromium, Cr(III), and hexavalent chromium, Cr(VI), are common in near surface environments, while metallic chromium, Cr(0), is mainly produced by human intervention (Motzer and Engineers, 2004; Bartlett, 1991).

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Processes affecting the remediation of chromium

May 01, 1991 Kassem T (2010) Kinetics and thermodynamic treatments of the reduction of hexavalent to trivalent chromium in presence of organic sulphide compounds, Desalination, 10.1016/j.desal.2010.03.011, 258:1-3, (206-218), Online publication date: 1-Aug-2010.

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Long-term leaching characterization and geochemical

Chromium released from the AOD slag was primarily presented as trivalent chromium (Cr(III)). The eluate exhibited low hexavalent chromium (Cr(VI)) concentration. As the L/S ratio increased to 115 L kg-1, the accumulated release quantity of Cr(III) and total chromium per AOD slag mass reached 1549.68 and 1613.67 μg kg-1, respectively. The long

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Long-term leaching characterization and geochemical

Dec 09, 2019 Chromium released from the AOD slag was primarily presented as trivalent chromium (Cr(III)). The eluate exhibited low hexavalent chromium (Cr(VI)) concentration. As the L/S ratio increased to 115 L kg-1, the accumulated release quantity of Cr(III) and total chromium per AOD slag mass reached 1549.68 and 1613.67 μg kg-1, respectively.

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Chromium: a review of environmental and occupational

Europe PMC is an archive of life sciences journal literature. The following topics are covered in this brief review on the environmental and occupational toxicology of chromium: occurrence, production and uses of chromium and chromium compounds; experimental toxicology; chromium toxicity for man; hygienic and ecologic aspects of chromium contamination of the environment.

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Chemical and microbial remediation of hexavalent chromium

Chemical and microbial remediation of hexavalent chromium from contaminated soil and miningmetallurgical solid waste A review. Download. Chemical and microbial remediation of hexavalent chromium from contaminated soil and miningmetallurgical solid waste A review. Biswaranjan Dhal. hrudayanath Thatoi.

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Notions à connaître sur le chrome hexavalent Brouillards

Le chrome hexavalent est la forme de chrome la plus toxique. En lisant différents articles et publications, vous verrez le chrome hexavalent identifié sous différentes formes, dont les suivantes : chrome hex, chrome VI, CrVI et Cr 6+. Niveaux d’exposition tolérables selon l’OSHA

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Hexavalent chromium removal by ferrochromium slag

Nov 11, 2005 The chromium content in slags is 2–12%, in oxide and metal form. The slag/metal amount ratio in smelting varies from 1.0 to 1.8, depending on raw materials . Slag is discarded as a waste material in enormous quantities during the ferrochrome production.

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(PDF) Hexavalent chromium removal by ferrochromium slag

Efficient adsorption of hexavalent chromium ions onto novel ferrochrome slag/polyaniline nanocomposite: ANN modeling, Isotherms, kinetics and thermodynamic studies

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In situ bioremediation of hexavalent chromium in presence

May 15, 2019 Stability of chromium in the ferrochrome slag dumps and leachate are affected by pH, redox potential and the presence of other metallic species in the slag. It is desirable to keep chromium in slag dumps in the trivalent [Cr(III)] state because trivalent chromium is 1000 times less toxic to living organisms than the hexavalent form [Cr(VI)].

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Recovery of Chromium from Ferrochrome Slag

Recovery of chromium from ferrochrome slag is 64% by treatment of slag with lime at 973K in solid phase. The soluble chromium ion was extracted with water. The chromium from liquid extract is separated with fly ash based zeolite which has 3000 mmol/gram and it

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(PDF) Utilization of ferrochrome wastes such as

Ferrochrome slag (FS) is another residue that is obtained as a solid waste by the smelting process during the production of stainless steel in Ferroalloy industries. etc. Trivalent chromium

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Case Study: Chromite mining and processing

hexavalent chromium.8 Sources of chromium emissions to air include coal and oil combustion (primarily trivalent), chrome plating (hexavalent) and industrial cooling towers (hexavalent).8 Chromium is removed from the atmosphere by fallout and precipitation over about 10 days.8 Smoking can contribute to chromium levels in indoor air as tobacco

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Field Method for the Determination of Insoluble or Total

he carcinogenic risks from chromium exposure are linked closely to the specific valence states of chro-mium compounds. (1) In the environment the most common chromium valences found are trivalent (Cr. III) and hexavalent (Cr. VI). While Cr. III . is an essential trace element for both animals and humans, (2, 3) Cr. VI . compounds

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Kinetics and pH Dependence of Chromium(VI) Reduction by

Apr 29, 1997 Iron(II) is one of the most important reductants of chromium(VI), a severe, toxic contaminant of natural waters, sediments, and soils. We studied the reaction kinetics between pH 2 and pH 7.2 with UV−VIS and multicomponent fitting, a method without the interference of added reagents. The reaction rate was minimal around pH 4. A rate increase with decreasing pH below 4 is

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Erin Brockovich

The case (Anderson, et al. v. Pacific Gas & Electric, file BCV 00300) alleged contamination of drinking water with hexavalent chromium (also written as "chromium VI", "Cr-VI" or "Cr-6") in the town of Hinkley, near Barstow in southern California.At the center of the case was a facility, the Hinkley compressor station, built in 1952 as a part of a natural-gas pipeline connecting to the San

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Chromite

Chromite is a crystalline mineral composed primarily of iron(II) oxide and chromium(III) oxide compounds. It can be represented by the chemical formula of FeCr 2 O 4.It is an oxide mineral belonging to the spinel group.The element magnesium can substitute for iron in variable amounts as it forms a solid solution with magnesiochromite (MgCr 2 O 4). A substitution of the element aluminium can

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Chromium(III) oxide Cr2O3 PubChem

The intestinal absorption of trivalent and hexavalent chromium (Cr) given orally (experiment I) or infused in the intestine (experiment II) was investigated in rats. The nonabsorbable form of chromium ((51)Cr2O3) and water-soluble and more absorbable Na2(51)CrO4 (the hexavalent form of Cr) were compared.Total retention of chromium given orally ranged around 15 percent of the dose, regardless

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Recovery of Chromium from Ferrochrome Slag Open Access

• Recovery of chromium from ferrochrome slag is 64% by treatment of slag with lime at 973K in solid phase. • The soluble chromium ion was extracted with water. • The chromium from liquid extract is separated with fly ash based zeolite which has 3000 mmol/gram and it can be regenerated to recover chromium.

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Conversion of Chromium Ore Processing Residue to Chrome

and 1150ºC under an oxidizing environment. Trivalent chromium in chromite ore was oxidized to hexavalent chromium. The highly soluble hexavalent chromium was then removed from the COPR (left over Chromium Ore Processing Residue) leaving un-oxidized trivalent chromium and slow-dissolving hexavalent chromium compounds [Burke et al., 1991].

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Magnetic Separation To Make Granulated Slag Less

Mar 14, 2020 The density of the ferrochrome slag is between 2.5- 3g/cm3 and that of ferrochrome 6.8 g/cm3. But slag particles associated with metal droplets shown density between 3

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