Ferrochrome Slag Trivalent Dan Hexavalent Chromium
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Characteristics of ferrochrome slag aggregate and its uses as …
Characteristics of ferrochrome slag aggregate and its uses as a green material in concrete – A review. Author links open overlay panel Ali Issa Fares ... the leaching value of hexavalent chromium is generally below 0.5 mg/L, and a notable 14.4% reduction in environmental disturbance indicators according to life cycle assessment …
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Use of Ferrochrome Slags in the South African Context
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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Recovery of Chromium from Ferrochrome Slag | Request …
A systematic study of extraction of chromium(VI) with 2-octylaminopyridine (2-OAP) in xylene at room temperature has been conducted. Quantitative extraction of chromium(VI) was observed in the 0.4 ...
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Hexavalent vs. Trivalent Chrome Plating
Hexavalent chromium plating is the traditional method of chromium plating (most commonly known as chrome plating) and can be used for decorative and functional finishes. Hexavalent chromium plating is achieved by submerging substrates into a bath of chromium xide (CrO 3) and sulfuric acid (SO 4). This type of chromium plating …
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Recovery of chromium from chromium-bearing slags …
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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Fundamentals of Ferrochrome (FeCr) Alloy and Its Slag
Important consideration is also given to environmental issues. Chromium is present in two ionic forms, i.e., trivalent and hexavalent chromium, with the hexavalent form being detrimental to human health. Therefore, this chapter also discusses how unutilized chromium slag pollutes the environment, making it a human health hazard.
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In situ bioremediation of hexavalent chromium in presence …
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% SiO2 ...
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Hexavalent chromium removal by ferrochromium slag
The aim of this study is to demonstrate the potential of Cr(VI) generation during jigging operation applied for ferrochrome recovery from slag. The Cr(VI) concentration s of water contacted with ferrochromium slag (W/FS = 10) in a closed cycle after 50 batches were found as 0.61 mg/l. Also, reduction of Cr(VI) to Cr(III) and a …
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Hexavalent chromium removal by ferrochromium slag
The aim of this study is to demonstrate the potential of Cr(VI) generation during jigging operation applied for ferrochrome recovery from slag. The Cr(VI) concentrations of water contacted with ferrochromium slag (W/FS=10) in a closed cycle after 50 batches were found as 0.61 mg/l. ... Hexavalent chromium removal by …
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In situ bioremediation of hexavalent chromium in presence …
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 o …
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A critical review of the material characteristics, utilizations
In the environment, chromium exists in two stable forms: hexavalent chromium Cr (VI) and trivalent chromium Cr (III). Cr (III) is less toxic and insoluble, while Cr ... The residual chromium in ferrochrome slag is typically found in the form of Cr 2 O 3, and its content varies greatly due to differences in raw materials and production …
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Trivalent vs. Hexavalent Chromium
Decorative trivalent chromium processes Has been used in the decorative market globally for over 40 years. With the upgrading of the hazard level of hexavalent chrome processes as a CMR source, a comparison of the processes is of interest. The major benefit of Trivalent chromium processes is that they are much more versatile.
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The recovery of ferrochrome from slag at Zimasco
Ferro chrome slag may contain chromium in +3 and +6 oxidation states. Separation and determination of chromium content of the slag samples collected from Jindal Ferro Alloys Corporation, (Kottha…
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Environmental and technical assessment of ferrochrome slag …
Chromium is one of the most common toxic heavy metal found in the environment. It exists in the common oxidation states of hexavalent chromium Cr(VI) and trivalent chromium Cr(III). While chromium as Cr(III) is less mobile and less harmful, Cr(VI) is highly leachable and extremely toxic under all environmental conditions.
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Environmental and technical assessment of ferrochrome slag …
Above pH 5, chromium leaching is dominated by hexavalent chromium and in acid medium, that is below pH 5, total chromium in leachate is increased …
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Reflections on hexavalent chromium: health hazards of an …
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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Recovery of chromium from ferrochrome slag
Ferro chrome slag may contain chromium in +3 and +6 oxidation states. Separation and determination of chromium content of the slag samples collected from Jindal Ferro Alloys Corporation, (Kottha ...
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The preparation and formation mechanism of ferrochrome …
This research focuses on utilizing FCS as the primary raw material to produce a high-strength ceramic aggregate, referred to as FCS-HSCA. The impact of calcination …
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Hexavalent chromium removal by ferrochromium slag
Hexavalent chromium removal by ferrochromium slag Mehmet Erdem a, H. Soner Altundogan˘ b, M. Deniz Turan b, Fikret Tumen¨ b, ∗ a Department of Environmental Engineering, Fırat University ...
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Ferrochrome slag: A critical review of its properties
Ferrochrome slag (FCS) is a by-product of ferrochrome industries and is produced during the extraction of ferrochrome from chromite ore. The chemical …
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Study of chromium immobilization behavior in unbound and …
This long-term study establishes the chemical stability of ferrochromium slag precluding the possible oxidation to hexavalent chromium and the resultant low …
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Chromium in Environment, Its Toxic Effect from Chromite …
People who inhale the hexavalent chromium over long periods run the risk of contracting lung cancer. Repeated or prolonged exposure can cause sores and ulcers on the feet and in fingers. Hexavalent chromium can cause damage to the respiratory tract, lungs, kidneys, liver and the gastro-intestinal, immune and blood and reproductive systems.
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Chromium Stabilization in Ferrochromium Slag for its …
Ferrochromium slag is a by-product of ferrochromium production via the smelting of chromite ores. The mechanical properties of this slag make it a potential material to be used as an inexpensive construction material, the utilization of which can reduce the use of natural resources. Despite its potential use, ferrochromium slag is …
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In situ bioremediation of hexavalent chromium in presence …
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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Reducing Hexavalent Chromium to Trivalent Chromium with …
Aqueous hexavalent chromium, Cr(VI), is rapidly reduced to trivalent chromium, Cr(III), by exposure to (polystyrylmethyl)trimethylammonium borohydride and with Amberlite-supported mild bases in a heterogeneous environment. Post-reaction removal of the insoluble reagents leaves no remediation-based chemical footprint in the …
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Ferrochrome slag: A critical review of its properties, …
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 …
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In situ bioremediation of chromium (VI) in a simulated …
In situ bioremediation of chromium (VI) in a simulated ferrochrome slag. ... It is desirable to keep chromium in the dump site in the trivalent state since the hexavalent state, Cr(VI), is highly mobile and carcinogenicity to aquatic life forms and humans, whereas the trivalent state, Cr(III), precipitates easily and is less toxic than Cr(VI). ...
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Efficient adsorption of hexavalent chromium ions onto novel …
The present investigation is concerned with the use of a nanocomposite adsorbent synthesized by polyaniline modification of ferrochromium slag (FeCr-PANI) …
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Speciation Of Chromium In Soils, Plants And Waste …
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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Chromium: general information
Overview. Chromium is a metal that is widely distributed in the earth's crust (soil and rocks), air and water. It mainly occurs in the environment in 2 forms trivalent chromium (chromium III ...
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