Magnetic tests for magnetosome chains in Martian …
· The chromite''s ≈90 K Curie point and an unusual magnetic transition at ≈55 K are marked (both reproducible in multiple measurement runs). As an independent test for chains, we reanalyzed the meteorite samples with X-band FMR (see Methods and Samples and ref. 14 ).
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. Chromite is isomorphous with the mineral Magnesiochromite and is easily confused with it, as they occur in the same environments.
Chromite Magnetic Information
Chromite has a Mohs hardness of 5.5 and a metallic luster making for very attractive faceted gems. Some Chromite specimens and gems may be weakly magnetic due to zones of Magnetite composition. Chromite was named in 1845 by Austrian mineralogist
Concentration of chromite from the Kempersayi deposit …
This procedure consists of magnetic separation in two stages, i. e. at a magnetic field strength of 5000 and at 11000 oersted. The concentration of chromite ore from the Kempersayi deposit according to the above procedure permits a decrease of SiO 2 (from 6.1 to 2.5% and CaO (from 1.3 to 0. 7%) and an increase of Cr 2 O 3 (from 51.7–52.3 to ...
Magnetic Gems : ClassicGems
Bornite. (magnetic after heating) Chalcopyrite. (magnetic after heating) Chamosite. (weakly magnetic) Chromite. (some are weakly magnetic)
Chromite Mineral Data
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
Chromite Beneficiation Process|Chromite Gravity …
Chromite Beneficiation Process Chromite is a mineral composed primarily of iron, magnesium and chromium oxide: (Fe, Mg) Cr 2 O 4 is a kind of spinel, the only chrome ore can be mined. The mineral composition is complex with uncertain magnesium …
Magnetic properties of rocks and minerals
magnetic susceptibility in experiments of up to 2 kbar [e.g., 76]. However, uniaxial stress will change the susceptibility both in amount and direction, dependent on the orientation of the applied stress relative to the magnetic field. When the applied stress is
Chromite Mineral Data
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 …
Structural, magnetic, magnetocaloric and specific heat …
· Author information: (1)Department of Physics, Central University of Rajasthan, Bandarsindri 305817, Ajmer, Rajasthan, India. We have synthesized PrCr0.85Mn0.15O3 (PCMO) chromite and investigated the influence of manganese (Mn) doping at Cr-sites on the structural, magnetic, magnetocaloric and thermal properties of PrCrO3 compound.
Geological and Geophysical Studies of Chromite Deposits in the Josephine Peridotite, Northwestern California and Southwestern …
(B) Geology and chromite in the Low Plateau area, Del Norte County, California, by John P. Albers _____ 39 (C) A magnetic interpretation of the Josephine Peridotite, Del Norte County, California, by Andrew (D) Geophysical studies
the corroded magnesia-chromite bricks are dissolved by rain and ground water. The risk of water contamination by heavy metal ions, mostly by Cu and Cr ions, is high. The toxicity of Cr3+/6+ compounds is in connection with their solubility. The Cr3+ than the Cr
Processing of Low-Grade Chromite Ore for Ferroalloy …
In view of difference in density and magnetic susceptibility between chromite and quartz, the Cr-ore processes through gravity and magnetic separator. The feed having 16% Cr 2 O 3 (Cr/Fe ratio 1.97) can be upgraded to 40.1% Cr 2 O 3 (Cr/Fe ratio 3.35) by gravity concentration [wet shaking table], whereas 42.5% Cr 2 O 3 (Cr/Fe ratio 3.02) is achieved by wet high-intensity magnetic separator ...
Ferrimagnetism of manganese ferrite-chromite
INTRODUCTION THE manganese ferrite-chromite system (MnFe2-(Cr(03) exhibits a complex magnetic be- havior with apparent discrepancies between moment values and the Neel model. These com- pounds have the spinel crystal structure with an almost normal distribution of ions: divalent manganese ions on the A or tetrahedral sites and trivalent chromium and iron on the B or octa- hedral sites.
Geophysical Methods, Exploration Geophysics » Geology …
Electromagnetic method. Geothermal method. Magnetic method. Electrical method. Radiometric method. Geophysical methods respond to the physical properties of the subsurface media (rocks, sediments, water, voids, etc.. ) and can be used Successfully when one region differs sufficiently from another in some physical property.
Joint multinary inversion of gravity and magnetic data using …
Geophys. J. Int. (2018) 215, 1540–1557 doi: 10.1093/gji/ggy351 Advance Access publication 2018 August 23 GJI Gravity, geodesy and tides Joint multinary inversion of gravity and magnetic data using Gramian constraints Wei Lin 1,2 and Michael S. Zhdanov 3 1Department of Geology and Geophysics, University of Utah, Salt Lake City, UT 84112, USA. ...
Phys. Rev. B 1, 3116 (1970)
The magnetic structure of the normal cubic spinel Mg Cr 2 O 4 (a 0 = 8.335 H) structures belongs to the space group P 4 ¯ 2 ′ m ′. The H-structure reflections appeared with different intensities relative to the nuclear reflections in three samples and did not appear at all in two other samples. ...
GEO143 Mineral Webpages
Chromite is used as a refractory material in blast furnaces and crucibles, this means it is used as insulations, generally for metals. (1) First Notable Identification: The first deposits were found in Baltimore, Maryland in 1800. (1) Originally this was where all the world''s chromite …
A discussion of magnetic separation techniques for concentrating …
In some cases, chromite concentrates can be produced by wet gravity concentration alone. In other chromite beneficiation processes, magnetic separation by RED is an essential polishing step. Figure 3 shows a typical flowsheet for upgrading chromite where
Evaluation of Chromite Recovery from Shaking Table …
This study aimed to evaluate the chromite recovery from shaking table tailings of Forumad plant by a dry high-intensity magnetic separation. The average feed grade of chromium trioxide (Cr2O3) was 7.62% by XRF. Also, different mineral phases were determined by ...
Nickel iron chromite black spinel
Nickel iron chromite black spinel. This substance is identified in the Colour Index by Colour Index Constitution Number, C.I. 77504. The ''Substance identity'' section is calculated from substance identification information from all ECHA databases. The substance identifiers displayed in the InfoCard are the best available substance name, EC ...
Magnetic exploration for chromite : a summary of the …
Additional Physical Format: Print version: Hawkes, H.E. (Herbert Edwin), 1912-Magnetic exploration for chromite (OCoLC)7297571 Material Type: Document, Government publication, National government publication, Internet resource Document Type: Internet
ULTRAMAFIC ASSOCIATED CHROMITE AND NICKEL …
INFORMATION CHROMITE - THE MINERAL Chromite is a member of the spine1 group R''+O- R3+2 03. It has a theoretical composition of Fe00203 with a maximum of 68 per cent Cr2O3 and 32 per cent Fe0 by weight. However, it commonly
What is chromite ore magnetic separation equipment? …
· Magnetic separator PTMS magnetic separation what is magnetic separation ？ Chromite is actually a weak magnetic mine. The reason why many people feel that they are not magnetic is because, 1. The magnetic field strength of the magnetic block or equipment
JVP TRADING is located in philippines, we are the manganese ore, copper ore, chromite ore, magnetic sand, iron ore supplier. Contact Information Contact Person Mr. Joemarie Pingcale Telephone 63-825-8888 Fax Number 63 Website https:// ...
Magnetic properties of rocks and minerals
Table 1 lists the (initial) susceptibility for common rocks and minerals. In ferro-, ferri-, or canted antiferromagnetic materials, hysteresis and the presence of magnetic domains cause the initial susceptibility to become grain-size dependent. This dependence for magnetite is plotted in Figure 1.
Separation of Chromite From Magnetite
Looks to me like the specific gravities of chromite and magnetite are too close for gravity separation. Flotation collector 3418A was used for the nickel fraction and the grind is …
Phys. Rev. 126, 556 (1962)
· Below this temperature the magnetic contribution to the fundamental spinel peaks arising from aligned spins increases as the temperature is lowered and is effectively saturated at about 20 K. At 18°K, additional sharp peaks appear at positions which cannot be indexed either on the original unit cell or on any reasonably enlarged cell.
Magnesiochromite: The mineral magnesiochromite …
Magnesiochromite is the magnesium-dominating form in a series with Chromite, whereas Chromite is iron-dominating. Magnesium chromium oxide, often with some iron. Crystals, which are octahedral, are very rare. Usually grainy, massive, and as rounded embedded masses.
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