Background

ferrochrome slag trivalent and heand avalent chromium

Exploring beneficial uses of ferrochrome slag: A case ...

ferrochrome slag: A case study of a South African Ferrochrome industry FF Mugivhi Orcid.org 0000-0003-3289-4056 ... Trivalent Chromium Cr(VI) Hexavalent chromium DEA Department of Environmental Affairs (now DEFF) DEFF Department of Environment, Forestry and Fisheries DWAF Department of Water Affairs and Forestry (now DWS) ...

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Hexavalent chromium removal by ferrochromium slag

Hexavalent chromium removal by ferrochromium slag ... trivalent chromium is quite immobile in the water environ- ... the use of ferrochrome slag for the reduc-tion of Cr(VI) in the outlet water of ...

Potential Toxic Effects of Chromium, Chromite Mining and ...

Smelting also produces Cr-VI contaminated slag, with estimated total chromium contents of 2 to 12%. The discovery that dry pulverizing of slag and ore converts Cr-III to Cr-VI may be very important during steps such as ferrochrome recovery from slag and end-uses of crushed slag.

ferrochrome slag trivalent and hexavalent chromium

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)].

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.

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

Recovery of Chromium from Ferrochrome Slag | Open Access ...

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 chromium ion was extracted with water and is subsequently separated …

origins of chromium vi in ferrochrome mining

Release behaviour of chromium from ferrochrome slag It exists in the common oxidation states as hexavalent Cr VI and trivalent Cr III Chromium as Cr III Residual chromium in the ferrochrome slag mostly remains entrapped in immobile spinel phase like Chromite or Magnesiochromite Magnesium Aluminium Dapatkan harganya.

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

Hexavalent chromium removal by ferrochromium slag ...

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 (FeO·Cr 2 O 3).The main slag additives used are quartzite and aluminium oxide containing materials to compensate for the high magnesium …

v118n5a10 Effect of cooling conditions on the leachability ...

The transition metal chromium (Cr), which is an essential alloying element in stainless steel, is prone to oxidation because of its high reactivity during melting (Li et al., 2013), and chromium oxides float in the molten slag phase. Trivalent and hexavalent chromium are the most common oxidation states in chromium compounds. Trivalent chromium is

Environmental impact of ferrochrome slag in road ...

The hexavalent chromium is a strong oxidising agent that reacts with organic matter and is reduced to trivalent chromium. The pH -redox potential relationship in the groundwater samples indicated a predominance of the triavalent form of chromium, with relatively low mobility (Brookins 1988).

(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 …

release behaviour of chromium from ferrochrome slag

Release behaviour of chromium from ferrochrome slag. 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 chromium oxide and it has the potentiality of releasing hazardous chromium compounds.

Hexavalent chromium removal by ferrochromium slag

Journal of Hazardous Materials B126 (2005) 176–182 Hexavalent chromium removal by ferrochromium slag Mehmet Erdema, H. Soner Altundogan˘ b, M. Deniz Turanb, Fikret Tumen¨ b,∗ a Department of ...