Removal of impurities in iron ore by Na2O-B2O3 flux.

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概要

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• Removal of impurities in fine-grained iron ore with Na2O-B2O3 flux and its mechanism have been investigated. The flux leaching method in which the oversaturated amount of powdery iron ore is treated with the flux has been used in the temperature range from 850 to 950°C. The recrystallization method has also been used in the temperature range from 1 400 to 1 450°C. The isolated impurities as well as those on the surface of ore particles were removed by the former method, while the inclusions present inside the particles together with the above-mentioned impurities were removed by the latter method. The high yield of iron oxide and the low content of impurities were obtained at the flux compositions of Na2O·2B2O3 and 2Na2O·5B2O3. The contents of Si, Al, Ca, Mg, Mn, and V decreased with increasing temperature from 850 to 1 450°C; these observations were explained by the break up of ore particles and the increase of the amount of recrystallized iron oxide. About 80% of iron oxide yield was obtained in both flux treatments by use of the Na2O·2B2O3 flux.

• The Iron and Steel Institute of Japanの論文

著者

• Suito Hideaki

  Research Institute of Mineral Dressing and Metallurgy, Tohoku University

• Kudo Setsuko

  Research Institute of Mineral Dressing and Metallurgy, Tohoku University

関連論文

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• Removal of impurities in iron ore by Na2O-B2O3 flux.

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