Ferrochrome Slag Trivalent And Hexavalent Chromium

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Hexavalent chromium removal by ferrochromium slag

02/06/2016· Hexavalent chromium removal by ferrochromium slag ... trivalent chromium is quite immobile in the water environ-ment because of limited solubility of its hydroxide, which is readily formed in the pH range of natural waters. Because of the benign character of Cr(III), detoxification and immo-bilisation processes of Cr(VI) is based on its reduction to Cr(III). Conventionally, the reduction of ...

Hexavalent chromium removal by ferrochromium slag.

11/11/2005· 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. The Cr(VI) concentrations of water contacted with ferrochromium slag …

[PDF] MODELING OF CHROMIUM LEACHING FROM …

The key characteristic of a solid waste is the degree to which contaminants will leach from the waste form. The waste in this study is ferrochrome slag from ferrochrome industry. The pollutant of concern is chromium in the form of hexavalent and total chromium. Varieties of tests have been developed to measure leaching of chromium species under different conditions.

Hexavalent Chromium in the Recovery of Ferrochromium …

AbstractA successful jigging process has been developed to recover ferro chromium metal from waste dumps. The potential for generating Cr(VI) during this operation has been investigated. The tests conducted indicate that there is no evidence for the continual release of Cr(VI) during the jigging operation. For instance, where Cr(VI) was detected it more likely occurs from the slag than from ...

Table 1 from In situ bioremediation of chromium (vi) in a ...

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). In this study, microbial… Expand

Chromium - PubMed

Hexavalent chromium (VI) contaminated local soil when chromium waste slag was part of the fill material present in residential, public, and industrial areas. In some urban areas, about two-thirds of the chromium in air results from the emission of hexavalent chromium from fossil fuel combustion and steel production. The remaining chromium in air is the trivalent form. The residence time of ...

Release of hexavalent chromium from corrosion of stainless ...

We used salts of chromium as trivalent chromium (chromic chloride) and hexavalent chromium (potassium dichromate) to verify that the amberlite separation technique separates hexavalent Cr into the upper phase and trivalent Cr into the lower phase. The use of the salts also verified that only the hexavalent Cr became red blood cell-associated and that most of this was intracellular rather than membrane bound. The use of the amberlite separation technique demonstrated that the hexavalent …

Chromium adsorption and Cr(VI) reduction to trivalent ...

Chromium as Cr(VI) is a industrially produced pollutant. Hexavalent chromium can be reduced to the trivalent state using various reductive agents or it can be removed from solution by surface-active adsorbents. In this study, both of these methods were evaluated using soya cake. A high efficiency for reduction of Cr(VI) to trivalent chromium was observed at pH < 1. Increasing the temperature, also …

Chromium Compounds - EPA

Chromium occurs in the environment primarily in two valence states, trivalent chromium (Cr III) and hexavalent chromium (Cr VI). Exposure may occur from natural or industrial sources of chromium. Chromium III is much less toxic than chromium (VI). The respiratory tract is also the major target organ for chromium (III) toxicity, similar to chromium (VI). Chromium (III) is an essential element ...

Table 2 from In situ bioremediation of chromium (vi) in a ...

DOI: 10.3303/CET1761007 Corpus ID: 54586304. In situ bioremediation of chromium (vi) in a simulated ferrochrome slag @article{Bansal2017InSB, title={In situ bioremediation of chromium (vi) in a simulated ferrochrome slag}, author={Nikky Bansal and J. Coetzee and E. Chirwa}, journal={Chemical engineering transactions}, year={2017}, volume={61}, pages={55-60} }

Hexavalent chromium removal by ferrochromium slag ...

11/11/2005· 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. A relatively small percentage of this material finds application, but the vast majority of ...

Journal of Chemical and Pharmaceutical Research, 2013, 5(5 ...

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]. The aim of the present investigation is to separate and estimate the chromium content (as chromium(VI) by oxidation) of the slag samples (Jindal Ferro Alloys Corpn., Kottha ...

INJECTION OF A FERROUS SULFATE/SODIUM …

07/05/2008· The hexavalent source area, consisting of slag and other solid wastes generated in the production of ferrochrome alloy, is located near a saltwater tidal marsh. A dissolved-phase hexavalent chromium plume, originating from the source area, is migrating toward the tidal marsh. Groundwater and aquifer solids in the source area are highly alkaline with groundwater pH values measured as high as …

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

Chromium adsorption and Cr(VI) reduction to trivalent ...

Hexavalent chromium can be reduced to the trivalent state using various reductive agents or it can be removed from solution by surface-active adsorbents. In this study, both of these methods were evaluated using soya cake. A high efficiency for reduction of Cr(VI) to trivalent chromium was observed at pH < 1. Increasing the temperature, also increased the yield. Experimentally, the optimum ...

Chromium Compounds - EPA

Chromium occurs in the environment primarily in two valence states, trivalent chromium (Cr III) and hexavalent chromium (Cr VI). Exposure may occur from natural or industrial sources of chromium. Chromium III is much less toxic than chromium (VI). The respiratory tract is also the major target organ for chromium (III) toxicity, similar to chromium (VI). Chromium (III) is an essential element ...

Processes affecting the remediation of chromium ...

01/05/1991· 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.

Controlling Hexavalent Chromium Exposures during ...

Controlling hexavalent chromium levels • Product substitution. Use a less toxic substitute in place of Cr(VI). For example, trivalent chromium is less toxic than Cr(VI). There are a variety of alternatives available that provide similar characteristics to chrome electroplating. • …

Chromite - Wikipedia

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 ...

Behavior of Hexavalent Chromium in a Polluted …

This work describes the chemical mechanisms governing transport and reduction of hexavalent chromium in soils of a contaminated industrial waste landfill. Groundwater and soil analyses indicate that the main source of chromium is a slag heap essentially consisting of mill tailings. In the groundwater, downstream migration of Cr(IV) is limited thanks to a redox mechanism involving chromate ions ...

Environmental and technical assessment of …

01/12/2013· Chromium release from the ferrochrome slag limits its utilization/disposal. ... 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. As per Occupational Safety Health Administration (OSHA) , the major ...

Hexavalent chromium removal by ferrochromium slag ...

11/11/2005· 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. A relatively small percentage of this material finds application, but the vast majority of ...

Recovery of Chromium from Ferrochrome Slag

of chromium and renders the slag harmless. In this paper industrial waste was collected from GTS industries and used in the subsequent experimentation. Ferrochrome slag is treated with lime to conduct slag-lime solid-solid reaction. Chromium present in the slag reacts with lime to form mixed chromates. The reaction is conducted at 973K, soluble

Biological effects of chromium and ferrochrome alloys ...

@article{osti_5023917, title = {Biological effects of chromium and ferrochrome alloys. Final report}, author = {Stemmer, K L and O'Flaherty, E J}, abstractNote = {Results are presented of a research program regarding the biological effects of trivalent chromium and ferrochrome alloys. The following topics were investigated: solubility of trivalent chromium dust; interaction of chromium with ...

Long-term leaching characterization and geochemical ...

09/12/2019· 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. The long-term leaching toxicity of chromium …

Processes affecting the remediation of chromium ...

01/05/1991· 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.

(PDF) Treatment of Hexavalent Chromium in Chromite …

Treatment of Hexavalent Chromium in Chromite Ore Processing Solid Waste Using a Mixed Reductant Solution of Ferrous Sulfate and Sodium Dithionite. Environmental Science & Technology, 2005. Chunming Su. Ralph Ludwig. Chunming Su. Ralph Ludwig. Download PDF. Download Full PDF Package. This paper. A short summary of this paper . 37 Full PDFs related to this paper ...

The Letter The Sault Star Didn’t Want To Publish ...

08/06/2019· Hexavalent chromium (chromium-6) is the inevitable byproduct of chromium manufacturing. It is a known genotoxic carcinogen, potentially causing cancers of the lung and upper respiratory tract through inhalation and gastrointestinal cancers through ingestion of contaminated water. As well there are a myriad of other serious health problems related to hexavalent chromium exposure. Hexavalent ...

Behavior of Hexavalent Chromium in a Polluted …

This work describes the chemical mechanisms governing transport and reduction of hexavalent chromium in soils of a contaminated industrial waste landfill. Groundwater and soil analyses indicate that the main source of chromium is a slag heap essentially consisting of mill tailings. In the groundwater, downstream migration of Cr(IV) is limited thanks to a redox mechanism involving chromate ions ...

Kinetics and pH Dependence of Chromium(VI) …

29/04/1997· Reducing Hexavalent Chromium to Trivalent Chromium with Zero Chemical Footprint: Borohydride Exchange Resin and a Polymer-Supported Base. ACS Omega 2019, 4 (7) , 11554-11557. DOI: 10.1021/acsomega.9b01194. Xianfang Fan, Shiming Ding, Musong Chen, Shuaishuai Gao, Zhen Fu, Mengdan Gong, Daniel C. W. Tsang, Yan Wang, Chaosheng Zhang. Peak Chromium Pollution in …