ferrochrome slag trivalent and heand avalent chromium

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 ... 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 ...

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.

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)].

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 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

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 …

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.

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

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 …

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

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).

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. 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.

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 ...