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(PDF) HEXAVALENT CHROMIUM ANALYSIS OF A FERROCHROME SLAG
2021.5.14 In this study, a slag sample resulted from a ferrochrome production process was analyzed for its hexavalent chromium content. Within this scope, in addition to the main material...
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Ferrochrome slag: A critical review of its properties,
2023.1.15 More investigations are required towards modifying the slag chemistry/re-engineering of slag phase, better slag-metal separation, and immobilization of hexavalent chromium to overcome these limitations and improve the physico-chemical and thermo-mechanical characteristics of FCS for its possible application in emerging areas.
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Characteristics of ferrochrome slag aggregate and its uses as
2021.8.2 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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Hexavalent chromium removal by ferrochromium slag
2005.11.11 In this study, the use of ferrochrome slag for the reduction of Cr(VI) in the outlet water of ferrochrome reclaiming process was explored. For this purpose, firstly, chromium dissolution from ferrochromium slag contacted with water was tested.
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Ferrochrome slag: A critical review of its properties,
2022.11.22 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, 15-25% Al Keywords: Coating; Construction materials; Ferrochrome slag; Geopolymer; Hexavalent chromium; Refractory. Copyright © 2022
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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 during chromium salt production is hazardous to nature and living organisms. Furthermore, CS discharge leads to considerable resource wastage.
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In situ bioremediation of hexavalent chromium in presence
2019.5.15 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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Hexavalent chromium removal by ferrochromium slag
2005.11.11 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. Also, reduction of Cr(VI) to Cr(III) and a subsequent precipitation of Cr(III) by using ferrochrome slag (FS) in a model solution has been aimed.
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Investigating the hexavalent chromium removal from aqueous
2021.9.27 Hexavalent chromium is one of the most significant heavy metals. In this research for the first time, eliminating the hexavalent chromium from the aqueous medium/aquedia applying bee...
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Research on the use of Ferro-Chrome slag in civil
use of ferrochrome slag in various civil engineering applications such as road construction, and cement and concrete industries. 2 Ferrochrome (FeCr) Slag Ferrochrome (FeCr) slag is by product from the production of Ferrochrome, an essential component in stainless steel industry [2]. An amount of 1.1 to 1.6 ton
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Magnetic separation and extraction chrome from high carbon ferrochrome slag
2015.5.1 Abstract High carbon ferrochrome slag (HCFS) is a byproduct from the production of ferrochrome, and there is no effective method to deal with it. In this paper, aiming at comprehensive utilization of HCFS, magnetic separation is determined to separate and extract chromium materials from HCFS. The investigation and characterization show
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Hexavalent chromium removal by ferrochromium slag
2005.11.11 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 ferrochromium
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Efficient adsorption of hexavalent chromium ions onto novel ferrochrome ...
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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Chromium in Environment, Its Toxic Effect from Chromite
2018.7.6 Ferrochrome industry is one of the biggest contributors of the chromium pollution to the water bodies. South Africa has the world’s largest chromium reserve. The waste materials produced by ferrochrome industry are slag, dust and processed water. These wastes have high chromium concentration that can cause pollution to the
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CHROMITE Indian Minerals Yearbook 2020 - IBM
2022.4.27 grade (25%), Ferrochrome grade (18%) and Refractory grade (14%). Low, Others, Unclassified and Not- ... sulphate solution converts the hexavalent into trivalent form which is non-carcinogenic. Incidentally, Mining Research Cell, Indian Bureau of Mines, during 2008-09 undertook a study for attenuation of hexavalent chromium in Sukinda
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Genotoxicity of Tri- and Hexavalent Chromium Compounds
2014.8.11 Chromium occurs mostly in tri- and hexavalent states in the environment. Hexavalent chromium [Cr(VI)] compounds are extensively used in diverse industries, and trivalent chromium [Cr(III)] salts are used as micronutrients and dietary supplements. In the present work, we report that they both induce genetic mutations in yeast cells. They both
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Oxidation and electrical properties of chromium–iron alloys
2020.9.9 The anodes studied were binary chromium–iron alloys; Cr 1−x Fe x with x ranging from 0.1 to 0.3, supplied as strips produced using arc melting by Ames National Laboratory, Iowa, USA.
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Case Study: Chromite mining and processing - Public
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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Inhibition of Hexavalent Chromium Release from Drinking
Chromium exists in one of three stable oxidation states in the environment, including zerovalent chromium, Cr(0), trivalent chromium, Cr(III), and hexavalent chromium, Cr(VI). In drinking water with a pH above 6.5, Cr(VI) in the form of carcinogenic CrO 4 2– is the dominant dissolved Cr species (chromic acid: pK a1 = 0.7 and pK a2 = 6.5).
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Genotoxicity of Tri- and Hexavalent Chromium
Chromium (Cr) is a heavy metal and a well-known environ-mental contaminant mainly exists in hexavalent [Cr(VI)] and trivalent [Cr(III)] states [1]. High levels of exposure to Cr(VI) occurs in chromate manufacturing, chrome plating, ferrochrome production and stainless steel welding. Occupational exposure to
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Chromium Compounds - U.S. Environmental Protection
2021.6.25 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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Effect of Phase Composition on Leaching Behavior and
2022.3.8 Ferrochrome slag (FS) and tundish slag (TS) are two typical slags with high contents of heavy metals. FS is a bulky by-product of the ferrochromium industry. Global FS production was approximately 11.7 million tons in 2017, and it has also been expected to increase by about 3.6% annually [ 1 ].
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Environmental impact of ferrochrome slag in road
2001.6.1 Comprehensive Characterization of Ferrochrome Slag and Ferrochrome Ash as Sustainable Materials in Construction. 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.
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Sources and toxicity of hexavalent chromium Semantic
2011.5.19 Hexavalent chromium is known to have 100-fold more toxicity than trivalent chromium, for both acute and chronic exposures because of its high water solubility and mobility, as well as easy reduction. The respiratory tract is the major target organ for hexavalent chromium following the inhalation exposure in humans.
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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 during chromium salt production is hazardous to nature and living organisms. ... Recovery of trivalent and hexavalent chromium from chromium slag using a bipolar membrane system combined with oxidation J Colloid Interface Sci. 2022 Apr 1;619:280-288. doi ...
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Chromium - PubMed
Trivalent compounds generally have low toxicity and the gastrointestinal tract poorly absorbs these compounds. Hexavalent chromium is a skin and mucous membrane irritant and some of these hexavalent compounds are strong corrosive agents. Hexavalent chromium compounds also produce an allergic contact dermatitis characterized by eczema.
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Hexavalent Chromium - National Institute of Environmental
2023.1.4 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
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Toxicological Review of Trivalent Chromium (CAS No.
2020.6.11 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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