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chromite processing cr fe

In this study, the long-term stability of Cr(VI) in the FeSO 4 and H 2 SO 4 (FeSO 4-H 2 SO 4) treated chromite ore processing residue (COPR) after 400 curing days and the stabilization mechanisms were investigated.FeSO 4-H 2 SO 4 treatment significantly reduced toxicity characteristic leaching procedure (TCLP) and synthetic precipitation leaching procedure (SPLP) Cr(VI) concentrations to lower ...

Leaching of hexavalent chromium from young chromite ore processing residue Katrin Matern1 Harald Weigand2 Ruben Kretzschmar3 Tim Mansfeldt1 1Faculty of Mathematics and Natural Sciences, Dep. of Geosciences, Institute of Geography, Univ. of Cologne, Albertus-Magnus-Platz, Köln, D-50923, Germany 2ZEuUS, THM Univ. of Applied Sciences,

The highest Cr extraction obtained was 7.0%. Further test work entailed exploring the effect of solid to liquid ratio using optimized conditions. The results showed a substantial increase of Cr extraction of up to 37%. This represents 1.33% decrease in chrome content, from 3.63% to 2.30%, in UG-2 …

Chromite ore processing residue (COPR) contains very high levels of chromium as Cr(III) and Cr(VI) and has a pH of ?11.5 to 12.Twenty nine elements, such as Cr, Fe, Al, Mg, Zn, Ca and Ni, were contained in the chromite sample based on the qualitative analysis.

become imperative to improve the Cr/Fe ratio along with Cr content of low/medium grade ore resources [3-4]. Various attempts have been made to improve the Cr/Fe ratio of Indian chromite ores. The Cr/Fe ratio of chromite concentrate was investigated by Murthy et al. and found that it can be improved up to 2.8 by using wet high intensity

Suitable products for Chromite ore processing as Cr Cr 2 FeO 4. Whether portable gas detectors, gas detection tubes or personal protective equipment - Dräger offers a comprehensive portfolio to protect you when handling hazardous substances. Quick navigation.

Chromite ore processing residue (COPR) containing measurable levels of hexavalent and trivalent chromium. [Cr(VI) and Cr(III), respectively] has been used to fill in low-lying areas in Hudson County, N.J.

We investigated a method for delivering ferrous iron into the subsurface to enhance chemical reduction of Cr(VI) in chromite ore processing solid waste (COPSW) derived from the production of ferrochrome alloy. The COPSW is characterized by high pH (8.5-11.5) and high Cr(VI) concentrations in the sol …

Chromite ore processing residue (COPR) was obtained from a chemical plant in Chongqing, China. Because of the different raw materials, production processes and formulas, the composition of COPR varies but typically contains Ca, Mg, Cr, Al, Si and Fe.

Chromite ore processing residue (COPR) is a waste derived from the chromate extraction from roasted ores and is deposited in some countries in landfills. The objective of this study was to investigate the leaching characteristics of hexavalent Cr [Cr(VI)] from two COPR samples obtained from unlined landfills in the Kanpur area of northern India.

General Chromite Information : Chemical Formula: Fe++Cr2O4 : Composition: Molecular Weight = 223.84 gm Chromium 46.46 % Cr 67.90 % Cr 2 O 3: Iron 24.95 % Fe 32.10 % FeO: Oxygen 28.59 % O: 100.00 % 100.00 % = TOTAL OXIDE

Chrome Ores Chromite ores and concentrates smelted at Mintek were characterized by the Cr grade, Cr/Fe ratio and gangue elements as presented in Table 1. The chromite ore Cr/Fe ratio is of importance as it directly affects the alloy Cr grade whilst the gangue elements affect the melting energy and rate as well as the slag chemistry.

The chromite ore Cr/Fe ratio is of importance as it directly affects the alloy Cr grade whilst the gangue elements affect the melting energy and rate as well as the slag chemistry. The chromite spinel ore morphology can be described stoichiometrically as (Fe, Mg)(Cr,Al,Fe)2O4 and chromite ores often contain gangue elements of SiO2 and MgO.

The chromite is associated with magnesium and as a result, it is expected that separation of chromite by magnetic separation will be easier and will occur at a higher magnetic strength as compared to the ferruginous ores [8]. Further studies need to target recovery of these fine chromite using high intensity magnetic separation. Mg Si Al Cr Fe Ca

(2010). The salt extraction process: a novel route for metal extraction Part I – Cr, Fe recovery from EAF slags and low grade chromite ores. Mineral Processing and Extractive Metallurgy: Vol. 119, No. 1, pp. 27-32.

The Cr:Fe ratio is one of the important factors that decides the end-use of the chromite mineral. For ferro-chrome Cr:Fe should be 2.8:1; Cr2O3 48% (min) and for …

chromite processing cr:fe - hartza.eu A chromite concentrate with 45.29wt% Cr2O3 and a Cr:Fe mass ratio of 1.85 can be produced from these low-grade chromite …

About 40% of the Indian chromite ore reserves are suitable for metallurgical purpose due to higher Cr:Fe ratio. The present investigation emphasized on the liberation and beneficiation characteristics of Indian chromite oreto improve the Cr: Fe ratio. The off grade chromite sample ofSukinda region, India analysed 40.8% of Cr 2 O 3 > with Cr:Fe ratio of 1.7 and 5.8% of …

The processing cycle of Fe-Cr involves the chemical reduction of the chromite ore. Smelting of HC Fe-Cr ferro-alloy. HC Fe-Cr and charge chrome are normally produced by the conventional smelting process utilizing carbo-thermic reduction of chromite ore (consisting oxides of Cr and Fe) using an electric submerged arc furnace (SAF) or a DC ...

04/03/2015 · The Cr:Fe ratio (chromiumtoiron mass ratio) of chromite affects the production of chromebased ferroalloys. Although the literature contains numerous reports related to the magnetic separation of different minerals, limited work concerning the appliion of magnetic separation to fine chromite from the Sukinda region of India to ...

chromium processing, preparation of the ore for use in various products. Chromium (Cr) is a brilliant, hard, refractory metal that melts at 1,857 °C (3,375 °F) and boils at 2,672 °C (4,842 °F). In the pure state it is resistant to ordinary corrosion, resulting in its application as an electroplated protective coating for …

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 ...

chromite that contained a m1n1mum of 46 pct Cr203 with a Cr-Fe ratio >2.0:1. 2. High-iron (chemical-grade) chromite that contaIned 40 to 46 pct Cr203 with a Cr-Fe ratio of 1.5 to 2.0:1. 3. Marginal chromite that met either the grade or Cr-Fe ratio requirements for …

Chromite ores are the only source of chromium. The majority of chromite ores are processed into an intermediate product called high carbon ferro-chrome, or charge chrome, an alloy containing >50% Cr, about 6-8% C, varying amounts of Si (0-4%, depending on the process used), with the balance Fe.

Highly alkaline (pH 12.2) chromate contaminated leachate (990 μmol L(-1)) has been entering soils below a chromite ore processing residue disposal (COPR) site for over 100 years. The soil immediately beneath the waste has a pH of 11→12.5, contains 0.3→0.5% (w/w) chromium, and 45→75% of the microbially available iron is Fe(II).

A Box–Behnken design (BBD)-based set of experiments for sulfuric acid leaching of low Fe(II)-chromite was utilized in this work for generating an experimental dataset for revealing the functional relationships between the processing parameters and the extraction yields of Cr and Fe.

Highly reactive nano-scale biogenic magnetite (BnM), synthesized by the Fe(III)-reducing bacterium Geobacter sulfurreducens, was tested for the potential to remediate alkaline Cr(VI) contaminated waters associated with chromite ore processing residue (COPR).The performance of this biomaterial, targeting aqueous Cr(VI) removal, was compared to a synthetic alternative, nano-scale zero valent ...

To avoid the transformation from Cr(III) into Cr(VI) in the chromite processing, sulfuric acid leaching has been proposed and extensively studied [26,27,28,29].In this process, Cr(III) is extracted from the chromite in a heated sulfuric acid solution with the help of recovered dichromic acid, with Cr(III) salts as products [30,31].A lot of effort is presently being made to understand the ...

12%The smelting behavior of waste chromite ore fines containing Cr and Ni to produce crude Fe–Cr–Ni–N alloy was investigated in this study. In the experiments, for each heat, liquid steel melt (metal pool 1 kg) was prepared in a 3--capacity laboratory-scale electric arc furnace for the absorption of reduced metals like chromium, nickel, etc., under hydrogen and nitrogen plasma …

We investigated a method for delivering ferrous iron into the subsurface to enhance chemical reduction of Cr(VI) in chromite ore processing solid waste (COPSW) derived from the production of ferrochrome alloy. The COPSW is characterized by high pH (8.5−11.5) and high Cr(VI) concentrations in the solid phase (up to 550 mg kg-1) and dissolved phase (3−57 mg L-1).

12%The smelting behavior of waste chromite ore fines containing Cr and Ni to produce crude Fe–Cr–Ni–N alloy was investigated in this study. In the experiments, for each heat, liquid steel melt (metal pool 1 kg) was prepared in a 3--capacity laboratory-scale electric arc furnace for the absorption of reduced metals like chromium, nickel, etc., under hydrogen and nitrogen plasma …

The plant data obtained by shift to shift include feed grade, concentrate grade, tailing grade, Cr/Fe ratio in concentrate. All the chromite processing data were found stationary over time. The autocorrelation was high for feed grade and Cr/Fe ratio. Weaker autocorrelation was observed for …

The efficacious treatment and resource utilization of the chromite ore processing residue (COPR) is important for chromate salt production. In this study, the leaching of valuable elements from the waste COPR was investigated. X-ray diffraction (XRD) analysis showed that the COPR mainly contained periclase (MgCr2O4), magnesiochromite ((Fe, Mg) (Cr, Fe)2O4), Fe (Cr, Al)2O4, and MgFeAlO4.

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