determination of chrome in chromite

determination of chrome in chromite

Determination of chromium in chromite | Analytical Chemistry

Rapid chromite dissolution using a manganese dioxide-lithium sulphate-sulphuric acid mixture for matrix-independent determination of chromium. Analytica Chimica Acta 1994 , 295 (3) , 325-330.

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Rapid Analysis of Chromite and Chrome Ore

Rapid methods for the determination of the major and of some minor constitu­ ents of chromite and chrome ore permit the complete analysis of a dozen or more samples to be performed in about 5 days with a precision comparable to that of the more conventional methods. The sample is fused with sodium peroxide in a zirconium crucible.

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Determination of chromium in chromite - ResearchGate

Download Citation | On May 1, 2002, G. Frederick Smith and others published Determination of chromium in chromite | Find, read and cite all the research you need on ResearchGate

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Determination of chromium in chrome ores - ScienceDirect

Feb 01, 1979 · RESULTS AND DISCUSSION Typical results for the determination of chromium in chrome ores using manganese dioxide and manganese ore of different grades are shown in Table 1. The results for the determination of chromium (III) in chromium (III) sulphate solution are given in Table 2. In acid medium chromite can be decomposed by heating with ...

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DETERMINATION OF FEO IN CHROMITE ORE – MSK

FeO analysis in chromite ores and chrome magnesite refractories involves difficulties on account of their high resistance to the reagents uses to decompose the samples. Under the present investigation, vanadate method has been used for determination of FeO as it is very less complicated and can be performed easily.

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Determination of chromium and trace elements in El-Rubshi ...

Sep 01, 2010 · Neutron activation analysis (NAA) is one of the most powerful analytical techniques for multielement determination of rocks. In the present work NAA and HPGe detector γ-spectroscopy was used to determine chromium and 15 minor and trace elements qualitatively and quantitatively from chromite rock samples collected from El-Robshi area in the Eastern Desert, Egypt.

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Chromite: The only mineral ore of chromium metal

What is Chromite? Chromite is an oxide mineral composed of chromium, iron, and oxygen (FeCr 2 O 4).It is dark gray to black in color with a metallic to submetallic luster and a high specific gravity. It occurs in basic and ultrabasic igneous rocks and in the metamorphic and sedimentary rocks that are produced when chromite-bearing rocks are altered by heat or weathering.

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XRF analysis of chromium ore | CRB GmbH

Chrome ores are used to produce high temperature and non-corrosive refractory materials like bricks made of magnesia chromite, chromite, picrochromite, corundum-chromite. Application Furnaces for the petrochemical and chemical industry, in carbon black reactors, glass kilns, incineration plants, blast furnaces, cement kilns.

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Determination of Chromium in Ferrochrome | Analytical ...

May 01, 2002 · Determination of 6-Ethoxy-1,2-dihydro-2,2,4-trimethylquinoline in Biological Materials. Analytical Chemistry 1956, 28 (3) , 376-378. DOI: 10.1021/ac60111a025. Scott Lynn and D. M. Mason. Determination of Chromium by Oxidation in Presence of Silver Nitrate. Analytical Chemistry 1952, 24 (11) , 1855-1855.

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Determination of chromium in chromite - ResearchGate

Download Citation | On May 1, 2002, G. Frederick Smith and others published Determination of chromium in chromite | Find, read and cite all the research you need on ResearchGate

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(PDF) Determination of Chromite Sands Suitability for Use ...

Determination of chromium oxide in the ore and chrome refractory materials containing chromium oxide. Ceramika -Polski Biuletyn Ceramiczny (88), 223-22. (in Polish).

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Precision spectrophotometric determination of chromium in ...

The chemical and manipulative variables have been examined in detail in order to develop a precise and direct spectrophotometric determination of chromium in chromite ores and in ferro-chrome. Samples are sintered with sodium peroxide in zirconium crucibles for

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Experimental determination of the activity of chromite in ...

Ronit Kessel, John R. Beckett, Edward M. Stolper, Experimental determination of the activity of chromite in multicomponent spinels, Geochimica et Cosmochimica Acta, Volume 67, Issue 16, 15 August 2003, Pages 3033-3044, ISSN 0016-7037, 10.1016/S0016-7037(03)00197-2.

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Standard Test Method for Determination of Chromium Oxide ...

1.1 This test method covers the determination of chromium oxide (Cr 2 O 3) in chrome ores in the compositional range from 25 % to 60 %. Note 1: As used in this test method, “%” refers to a mass fraction (wt/wt %) (g/100g).

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Mineral processing: leaching process of chromium and ...

May 06, 2019 · Experiment #1: determination of chemical composition of chromite ore Different methods have been used for the dissolution of chromite, e.g. lithium tetraborate flux [ 23 ], sodium peroxide fusion and mixtures of HNO 3 , HF and HClO 4 [ 21 ], MnO 2 –LiSO 4 –sulphuric acid mixtures [

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Process optimization of a chrome ore gravity concentration ...

Chromite deposits occur in the form of discontinuous bands, lenses, and pockets in different host rock associations. Chrome ore beneficiation Most of the chrome ores around the world are beneficiated by gravity concentration techniques. A conventional chromite ore beneficiation process plant (Figure 3) consist of two sections:

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IS 12667-1: Methods of chemical analysis of chromite sand ...

IS 12667-1: Methods of chemical analysis of chromite sand, Part 1: Determination of silica Item Preview remove-circle Share or Embed This Item. Share to Twitter. Share to Facebook. Share to Reddit. Share to Tumblr. Share to Pinterest. Share via email.

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Determination of Chromium in Ferrochrome | Analytical ...

May 01, 2002 · Determination of 6-Ethoxy-1,2-dihydro-2,2,4-trimethylquinoline in Biological Materials. Analytical Chemistry 1956, 28 (3) , 376-378. DOI: 10.1021/ac60111a025. Scott Lynn and D. M. Mason. Determination of Chromium by Oxidation in Presence of Silver Nitrate. Analytical Chemistry 1952, 24 (11) , 1855-1855.

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Uses of Chromium | Supply, Demand, Production, Resources

Chromite, an oxide of iron, magnesium, aluminum, and chromium, is the only ore mineral of chromium. In nature, chromite deposits are generally of two major types: stratiform (layered) and podiform (pod shaped). Both types are associated with ultramafic igneous rocks. The world's largest stratiform chromite deposits are found in South Africa, in ...

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Chromite: The mineral Chromite information and pictures

Chromite, the principle ore of the element chromium, is a commercially valuable mineral. However, due to mining restrictions and the fact that Chromite is not commonly found in crystallized form, it is not well-represented in mineral collections.

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Chromite in Komatiites, 1. Magmatic Controls on ...

Each determination for Belingwe, Mt Clifford and ‘Walter Williams (pairs)’ is a single pair of olivine and chromite grains, each probed 10–15 μm from the mutual grain boundary. Each determination for ‘Walter Williams (avs)’ is based on an average of cores of

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Chapter 6.4 Chromium

Chapter 6.4 Chromium Air Quality Guidelines - Second Edition WHO Regional Office for Europe, Copenhagen, Denmark, 2000 2 great difficulties associated with the analysis of the various chromium compounds(8), the results obtained during the last 10–15 years

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SODIUM DICHROMATE LISTING BACKGROUND

Chromite ore is dried and ground and then fed into the hearth system where it is mixed with soda ash (sodium carbonate) and then heated to approximately 2000°F. This treatment oxidizes the chromite ore, converting the majority of the chromium in the ore from trivalent to hexavalent chromium.20 The basic reaction taking place is: 4FeCr 2 O 4 ...

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Determination of ferrous oxide in chromite and chrome ...

In exact analyses of chromite and chrome-magnesite refractories for the ferrous oxide content, current-flow methods of titration using either Mohr's salt or permanganate can be used. The results are better in the first case.For wide-scale visual titration methods Mohr's salt can be used with strict proportioning of the indicator sodium diphenylamine sulphonate or phenylantranil acid.If there ...

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Chromite mining - The Oregon Encyclopedia

Chromite is a mineral that contains chromium. It is considered a strategic mineral, which generally means that it is necessary for military and industrial use during periods of national emergency. The strategic mineral concept was created during World War I and became law just prior to World War II with the passage of the Strategic Minerals Act ...

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Chromite Sand Testing - Minerals Tech

Typical Chromite Sand Testing • South African Chromite Sand is the world standard for metalcasting and foundry applications, however there can be variations in the quality of chromite sand depending on grade, location, mining and beneficiation methods. ... • Moisture determination - important for compatibility with chemical binders

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Atomic-absorption determination of rhodium in chromite ...

Rhodium is determined in chromite concentrates by atomic absorption after concentration either by co-precipitation with tellurium formed by the reduction of tellurite with tin(II) chloride or by fire assay into a gold bead. Interelement interferences in the atomic-absorption determination are removed by buffering the solutions with lanthanum sulphate (lanthanum concentration 1%).

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Chromite Mineral Data

Chrome iron ore : Chromic iron : Ferrichromite - magnetic, altered : ICSD 20819 : PDF 34-140 : Chromite Image: Images: Chromite Antigorite. Comments: Chromite veins in yellow to green antigorite with picrolite, chromian antigorite and dolomite (polished section). Location: Wood's ...

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Chromite in Komatiites, 1. Magmatic Controls on ...

Each determination for Belingwe, Mt Clifford and ‘Walter Williams (pairs)’ is a single pair of olivine and chromite grains, each probed 10–15 μm from the mutual grain boundary. Each determination for ‘Walter Williams (avs)’ is based on an average of cores of

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A COMPARATIVE STUDY ON RECOVERY OF CHROMIUM

chromite. Determination of total chromium concentration Determination of total Cr by the diphenyl carbazide (DPC) method was used in this study (Lenor et al., 1999). Calibration curve in the range of 0.02-5 mg/dm3 were prepared by submitting Cr standard solutions to the

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Chromite | A Northern Blog

Feb 25, 2013 · The drilling program was managed by Cliffs Chromite Far North Inc. who are also developing the Black Thor chromite mine. The results show that at a 15% cutoff, the measured resource is 29.5 MT (megaton), grading 29% chromium oxide (Cr 2 O 3) the indicated resource is 7.9 MT grading 26.7% Cr 2 O 3, and the inferred resource is 4.8 MT grading 25 ...

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Determination of Hexavalent Chromium (Cr(VI ...

The concentration of hexavalent chromium (Cr(VI)), a toxic environmental pollutant and carcinogen, was determined in samples collected from Nacogdoches Wastewater Treatment Plant (NWWTP) using ion chromatography and UV-visible spectrophotometry (IC, UV-Vis). On reaction with 1,5-diphenylcarbazide (DPC) Cr +6 forms a 1,5-diphenylcarbazide-Cr(VI) complex, which is then analyzed at 530 nm and

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A Guide to Hexavalent Chromium Cr(VI) for Industry

tion metals, and is mined as the principal ore chromite (chrome iron ore), FeCr2O4. Chromium has oxidation states ranging from −2 to +6, of which the divalent (+2, chromous), trivalent (+3, chromic) and hexavalent (+6) are the most important. Trivalent chromium, Cr(III), which is the most stable form of chromium, is found in trace amounts in the

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chromium processing | Britannica

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

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CHROMIUM AND CHROMIUM COMPOUNDS - Chromium, Nickel

(a) Chromite ore. Chromite ore consists of varying percentages of chromium, iron, aluminium and magnesium oxides as the major components. It has been classified into three general grades associated with their use and chromic oxide content: metallurgical (greater than 46%), chemical (40–46%) and refractory (less than 40%) grades ().During the past two decades, technological advances have ...

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Air Pollution Aspects of Chromium and its Compounds

In addition to their use as chromite bricks or magnesia- chrome bricks, chrome refractory materials may be used as coatings to close pores and for joining bricks within the fur- 101 nace. Studies of chromium air pollution from this source have not been found. ... Determination of the concentration and valence of chromium adjacent to chrome ...

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Manual of Procedure for Chemical and Instrumental Analysis of

1.2 determination of major and minor constituents from stock solution 5 aluminium ores 22 alumino silicate & other silicates 24 antimony ores 26 arsenic ores 28 barium ores 28 bismuth ores 34 chrome ores 36 cobalt ores 39 fluorspar ores 41 gypsum 44 iron ores 46 limestone, dolomite, magnesite and allied materials 47 manganese ores 48 molybdenum ...

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