ferrochrome slag trivalent و hexavalent chromium

(PDF) HEXAVALENT CHROMIUM ANALYSIS OF A FERROCHROME SLAG
2021year5month14day In this study, a slag sample resulted from a ferrochrome production
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Environmental and technical assessment of ferrochrome slag
2013year12month1day Chromium is one of the most common toxic heavy metal found in the
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Chromium Stabilization in Ferrochromium Slag for its
2022year6month3day This study investigates the effect of heat treatment and composition
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Efficient adsorption of hexavalent chromium ions onto novel ferrochrome ...
2022year7month7day The present investigation is concerned with the use of a nanocomposite
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Comprehensive Characterization of Ferrochrome Slag and Ferrochrome
2022year7month15day The remnant chromium in ferrochrome slag is usually observed in the
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Implementation of industrial waste ferrochrome slag in
2014year6month1day The slag also includes Cr and Fe oxides and calcium oxide. Common
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Recovery of trivalent and hexavalent chromium from chromium slag
Chromium slag (CS) with large quantities of multivalent Cr species (III and VI) generated
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Release behaviour of chromium from ferrochrome slag
2012year9month26day Huge amount of ferrochrome slag, a solid waste is being generated
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In situ bioremediation of hexavalent chromium in presence
2019year5month15day 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 chromium-bearing slags
2021year5month10day SAF slag, EAF slag, and AOD slag are typical chromium-bearing SSS slags. The recovery of chromium from those slags via appropriate methods has significant economic and environmental benefits. The physicochemical features of SAF slag, EAF slag, and AOD slag were appraised in this study, including a relatively high content of
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(PDF) Use of Ferrochrome Slags in the South
2022year1month26day Two stable forms of chromium exist either as either trivalent, Cr (III), or hexavalent, Cr ... M. Altumdogen, H. S., 2005. Hexavalent chromium by ferrochrome slag. Journal of Hazardous ...
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Chromium Compounds - U.S. Environmental Protection
2021year6month25day Air emissions of chromium are predominantly of trivalent chromium, and in the form of small particles or aerosols. (1,2) The most important industrial sources of chromium in the atmosphere are those related to ferrochrome production. Ore refining, chemical and refractory processing, cement-producing plants, automobile brake
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Efficient adsorption of hexavalent chromium ions onto novel ferrochrome ...
2022year7month7day The current research is concerned with the adsorption behavior of chromium (IV) ions in an aqueous solution using a novel ferrochrome slag/polyaniline nanocomposite (FeCr-PANI) adsorbent. The effect of process parameters such as temperature, pH solution, initial Cr (VI) ions concentration, adsorbent dosage, and contact time on the adsorption
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Speciation Of Chromium In Soils, Plants And Waste
2013year12month21day Leaching of Cr (VI) from the ferrochrome slag causes sustainable contamination to the environment (Shah,1984). Lind et al., (2001) and Pillay et al., (2003) indicated that there is gradual oxidation of trivalent to hexavalent chromium when the slag is exposed to atmospheric oxygen. This releases the more mobile and toxic Cr (VI) into the ...
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Evaluation of Functional, Microstructural, Environmental
2022year9month6day This paper reports on the functional, economic, and environmental performance of sustainable concrete prepared from the waste materials like ferrochrome ash (FCA) and air-cooled ferrochrome slag (ACFS). FCA and ACFS are metallurgical waste materials from the ferrochrome industry, which contain residual chromium and face
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Comprehensive Characterization of Ferrochrome Slag and Ferrochrome
2022year7month15day Ferrochrome slag (FCS) and ferrochrome ash (FCA) are by-products generated during the production of ferrochrome alloy in the ferrochrome industry. The use of these by-products as construction materials appears to be an innovative strategy that could provide numerous environmental and socio-economic benefits. However, the residual
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Characteristics of ferrochrome slag aggregate and its uses as
2021year8month2day Typically, chromium forms about 6–12% of the FCS and usually exists in oxides as trivalent Cr (III) and hexavalent Cr (VI). The majority of residual chromium in FCS is in Cr (III) form [20] . Under adverse circumstances, there is a remote chance that Cr (III) will be converted to the higher oxidation form of Cr (VI).
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Removal of hexavalent Chromium-Industry treated water
2021year1month1day The prepared photocatalysts were applied for the reduction of hexavalent chromium ion (Cr(VI)) to the less toxic trivalent one (Cr(III)). The 1.6 gL −1 of 16 % CuO/WO 3 has reduced Cr(VI) to Cr(III) at a rate of 265.33 μmol min −1. In addition, CuO/WO 3 heterostructured photocatalyst has signified five-time reused stability. This superb ...
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Hexavalent chromium removal by ferrochromium slag
2005year11month11day Ferrochrome slag (FCS) is a by-product of ferrochrome industries and is produced during the extraction of ferrochrome from chromite ore. The chemical composition of FCS comprises of 27–33% SiO 2, 15–25% Al 2 O 3, 20–35% MgO, and 10–15% iron-chromium compounds.The high chromium content of FCS and the possibility of its
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In situ bioremediation of hexavalent chromium in presence
2019year5month15day 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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Waste Management Research Utilization of
2023year8month19day 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. FS possesses the required
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High Carbon Ferrochrome Technology - ScienceDirect
2013year1month1day These ores typically have Cr/Fe ratios of 1.5 to 1.6 and result in ferrochrome with a chromium content of 50% to 55% (and recently even below 50%) and carbon content typically between 6% and 8%. Ferrochrome produced from these ores is generally referred to as charge chrome and is often included in the broad category of high carbon
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Recent advances in hexavalent chromium removal from aqueous solutions ...
Abstract. Chromium exists mainly in two forms in environmental matrices, namely, the hexavalent (Cr(VI)) and trivalent (Cr(III)) chromium.While Cr(III) is a micronutrient, Cr(VI) is a known carcinogen, and that warrants removal from environmental samples.Amongst the removal techniques reported in the literature, adsorption methods are viewed as superior
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In situ bioremediation of hexavalent chromium in presence
2019year5month15day 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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Efficient adsorption of hexavalent chromium ions onto novel ferrochrome ...
2022year7month7day Therefore, according to the particle size distribution curve of GB/T 14684-2011 grading zone-II, the fine ferrochrome slag was optimized to belong to the zone-Ⅱ.
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Hexavalent chromium removal by ferrochromium slag
2005year11month11day 1.. IntroductionFerrochromium is a master alloy of iron and chromium, containing 45–80% Cr and various amounts of Fe, C and other elements. Ferrochromium is produced pyrometallurgically by carbothermic reduction of chromite ore (FeOCr 2 O 3).The main slag additives used are quartzite and aluminium oxide containing materials to
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Release behaviour of chromium from ferrochrome slag
2012year3month28day Huge amount of ferrochrome slag, a solid waste is being generated from submerged electric arc furnace during manufacturing of ferrochrome alloy. The waste slag contains about 6-12% chromium as ...
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Reflections on hexavalent chromium: health hazards of an
2000year9month1day Chromium has been used commercially in the United States for more than 100 years in metal alloys and other compounds, as a pigment, and in the tanning and metal plating industries, and many studies have looked at its effects in terms of occupational health. But, although scientists know that Cr(VI) is a human carcinogen and that it can
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