Demonstration of dry magnetic separation to upgrade the Mn:Fe ratio of a ferromanganese ore sample

IF 0.9 Q3 MINING & MINERAL PROCESSING Mineral Processing and Extractive Metallurgy-Transactions of the Institutions of Mining and Metallurgy Pub Date : 2023-06-17 DOI:10.1080/25726641.2023.2222909

M. Peterson, R. Karadkal, V. Nunna, S. Hapugoda, P. Austin

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Abstract

ABSTRACT Sighter Induced Roll Magnetic Separation tests were conducted on a ferromanganese ore sample to determine the potential to significantly upgrade the Mn content and Mn:Fe ratio. The sample had a Mn:Fe ratio of 1.3 and was comprised of hematite, cryptomelane, pyrolusite, quartz, goethite and braunite. Tests at 4.7, 2.3 and 1 mm top sizes revealed better separation of Fe from Mn at the 2.3 and 1 mm top sizes. This reflected the better liberation and separation characteristics of Fe oxides at 2.3 mm and both Fe and Mn oxides at 1 mm. A test on the −2.3 + 0.6 mm size fraction improved the Mn:Fe ratio to 4.6, the Mn content to 41.5 wt% with 69.4% mass recovery and 84.2% Mn recovery. Particle magnetic susceptibility was influenced by particle microporosity, and its effect on apparent density, resulting in some Mn oxides reporting to the magnetic concentrate and Fe oxides to the tails.

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