Experiment on Rare Earth Flotation from Hydrogen-based Mineral Phase Transformation-magnetic Separation Tailings for a Refractory Iron Ores in Bayan Obo
The medium-poor oxidized ore in Bayan Obo deposited for many years contains iron,rare earth and other com-position,which is difficult to be separated efficiently by conventional process,but the iron can be recovered efficiently by hydro-gen-based ore phase transformation-magnetic separation process.In order to understand whether the phase conversion process of hydrogen-based ore affects the floatability of rare earth minerals in rare-earth-rich iron tailings,a systematic beneficiation test was carried out.The results showed that under the conditions of 506E dosage of 4 200 g/t,sodium silicate dosage of 1 800 g/t and slurry temperature of 65℃,the closed circuit flotation with two roughing and three cleaning achieved a rare earth ore con-centrate with an REO grade of 59.00%and an REO recovery of 67.91%.Chemical composition analysis and X-ray diffraction showed that the main components were rare earth oxides(Ce7 O12),monazite and a small amount of fluorite.The rare earth ele-ments were effectively enriched in the concentrate,demonstrating that the hydrogen-based mineral phase transformation process did not adversely affect the flotation recovery of rare earth elements.
Bayan Obohydrogen-based mineral phase transformationenriched rare earth tailingsflotation
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