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  • Methods for the Analysis of Mineral Chromites and ...

    This report describes the elemental characterization of chromite and related materials at the Bureau of Mines, Albany Research Center. Analytical methods for determining the major constituents, representing extensive experience, refinement, and development, are described and fully annotated.[...]

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    Chromite Ore Processing. Low-grade ore obtained from an open cut trench at a chromite deposit near Auburn, Calif., was treated in the laboratory using gravity-magnetic separation and flotation beneficiation techniques. Flotation using known methods, however, gave very poor results and will not be discussed further in this report.[...]

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    We present a comprehensive study on optimization of wet preparation routes yielding well-crystalline spinel chromite, ACr 2 O 4 nanoparticles (A = Cu, Fe, Ni, Mn and Mg). The auto-combustion and co-precipitation methods in the presence of nitrate or chloride ions and under different atmospheres, followed by annealing of final products at different temperatures were tested.[...]

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    Collected papers presented at the 59th Brazilian Ceramic Conference (CBC59, 17 - 20 May, 2015) covers the wide spectrum of research and examples of applied use of ceramics and related materials, starting from conventional ceramics, bioceramics, semiconductors and finishing to materials in construction and in environmental engineering.These results of scientific and engineering research …[...]

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    h hour nm nanometer L liter pet percent meq wt milliequivalent weight ppm part per million mg milligram s second min minute METHODS FOR THE ANALYSIS OF MINERAL CHROMITES AND FERROCHROME SLAG By D. A. Baker^ and J. W. Siple^ ABSTRACT This report describes the elemental characterization of chromite and related materials at the Bureau of Mines ...[...]

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  • Crystal structures and cation distributions in simple ...

    and whole-pattern (or Rietveld) refinement methods. The chromite spinels are expected from crystal chemical considerations to have an almost completely normal ca- tion distribution (inversion parameter, x, equal to zero). In agreement with this expectation, three samples of MgCr204 annealed at 900, 1100 and 1300 ~ C, and ...[...]

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    Chromite mining - The Oregon Encyclopedia. Chromite is used as an alloy of steel for hardening cutting tools, ordnance, and armor plate. The story of chromite in Oregon begins during the Jurassic Period, approximately 150 million years ago, when both the Klamath and Blue mountains were part of Oregon's early Coast Range.[...]

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    Vol.6, No.2 Characterization and Beneficiation of Anka Chromite Ore 145 reaction in the presence of suitable oxidizing agents such as calcium chromate CaCrO 4, sodium nitrate NaNO 3, or manganese dioxide MnO 2 in an exothermic reaction. It can[...]

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    Optical and Structural Properties of Lanthanum Chromite Synthesized by Microwave Assisted Self-Combustion Method ... followed by Rietveld refinement, UV-Visible and colorimetry. ... This method ...[...]

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    This report describes the elemental characterization of chromite and related materials at the Bureau of Mines, Albany Research Center. Analytical methods for determining the major constituents, representing extensive experience, refinement, and development, are described and fully annotated.[...]

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  • Rietveld refinement of Al0.492Cr1.133 Fe0.78 Mg0.499 Ni0 ...

    Aug 29, 2019· Here we report the synthesis of Al 0.492 Cr 1.133 Fe 0.78 Mg 0.499 Ni 0.007 O 4 Si 0.001 Ti 0.082 Zn 0.005 (chromite) using a wet chemical approach i.e Coprecipitation method. The prepared powdered composite was structurally characterized through X-ray diffraction analysis. The XRD data was refined by MAUD and Fullprof suit software.[...]

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    Chrome Ore Beneficiation Process | Chromite Processing . May 16, 2019 · Chrome process equipment is wet type strong magnetic separator, and spiral chute (chrome spiral plant) of gravity separator 3 Experimental results and discussion 31 Chrome magnetic separation process The chrome raw ore is a flotation tail ore, which is mainly formed in the chromite, and the chromite is the target ...[...]

  • Application of the Rietveld method to assess chromium(VI ...

    Mar 15, 2007· The method assists in determining the speciation of contaminants in solid matrices both qualitatively and quantitatively in a statistically defensible approach, as it does not focus on a microscale. Rietveld was applied to chromite ore processing residue (COPR), a cementitious waste containing hexavalent chromium.[...]

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