chromite ore reducing

  • Solid State Reduction of Preoxidized Chromite-iron Ore ...

    1) School of Minerals Processing and Bioengineering, Central South University The present investigation is to reveal the reduction behaviors of pre-oxidized chromite-iron ore pellets by coal. The effects of reduction parameters (temperature, time and dosage of reducing agent) on solid reduction of ...

  • Microwave reduction of Black Thor chromite ore: Canadian ...

    ABSTRACTBlack Thor chromite ore from the Ring of Fire deposit in Northern Ontario was carbothermically reduced in a microwave system to produce a ferrochromium alloy. The as-received ore contained 43.0% Cr2O3, 19.9% Fe2O3, 14.5% MgO, 13.4% Al2O3, and 7.0% SiO2. Activated charcoal was utilised as the reducing agent.


    3.1 Preoxidation of Chromite Ore The raw chromite ore is oxidized in air for 2h duration at 900 0C using the chamber furnace. This pre-oxidized chromite ore is used as base material for the reduction studies. As the iron is present in the form of FeO in Indian chrome spinel, during oxidation reaction, the FeO present in spinel gets


    pre-reduction of chromite ore at 1 400-1500 ° C. It is obvious that the presen t study has demon strated that high levels of pre-reduction of chrom ite ore can be obtain ed at relatively low ...

  • Ball mill to reduce hexavalent chromium to trivalent

    It is claimed by a company producing chromate chemicals that it is pretreating the chromite ore processing residue from a high lime-soda process in a ball mill using ferrous chloride as a reducing agent.

  • CoM 2014 Reducing Risk through Testwork PILOT SMELTING .

    Reducing Risk through Testwork . PILOT SMELTING OF RING OF FIRE CHROMITE ORES. Rajan Pandher, ... • About 75% of chromite ore mined is processed via high carbon ferro-chrome usually as "charge chrome", feedstock for the AOD or NOD conversion process to stainless steel.

  • Coal Based Direct Reduction of Preoxidized Chromite Ore at ...

    Reduction of preoxidized chromite ore composite pellets using coal reductant is investigated at high temperature (1500 0C). Chromite ore oxidized in air at 900 0C for 2h duration is used as base material for carrying out the reduction studies.

  • Reduction and immobilization of hexavalent chromium in ...

    Mar 25, 2019 · In this work, a series of long-term treatment trials were conducted to evaluate the remediation performance of amorphous iron pyrite (FeS 2(am)) toward hexavalent chromium (Cr(VI)) in chromite ore processing residue (COPR).The effectiveness of FeS 2(am) was assessed using alkaline digestion, the synthetic precipitation leaching procedure (SPLP) and the physiologically based .

  • Chromite Ore Processing Residue (COPR): Hazardous ...

    Mar 31, 2005 · Chromite ore processing residue (COPR), which contains hexavalent chromium (Cr 6+) at concentrations typically in the range of thousands of milligrams/kilograms, was deposited over a timeframe of 50 years as fill at a site referred to as SA7 in New Jersey.Significant surface heaving associated with COPR weathering-induced mineralogical expansion has been observed at the site over .

  • Chromite - Wikipedia

    90% of mined chromite ore is used for stainless steel production. Chromite ore production has been on a steady incline, which causes a rise in demand for the stainless steel markets. Nichrome alloys. Chromite, when alloyed with iron and nickel creates an alloy called nichrome. Nichrome is described as being 80% nickel and 20% chromium.