Na_2O-B_2O_3 系フラックスによる鉄鉱石中の不純物の除去

概要

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Removal of impurities in fine-grained iron ore with Na_2O-B_2O_3 flux and its mechanism have been investigated by use of the flux leaching and the recrystallization methods. The isolated impurities as well as those on the surface of ore particles were removed by the former method, while the inclusions prerent inside the particles together with the above-mentioned impurities were removed by the latter method. In the flux leaching method, the high yield of iron oxide and the low content of impurities were obtained at flux compositions of Na_2O・2B_2O_3 and 2Na_2O・5B_2O_3. The contents of Si, Al, Ca, Mg, Mn, V decreased with increasing temperature from 850℃ to 1450℃ ; 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 Na_2O・2B_2O_3 flux.
社団法人日本鉄鋼協会の論文
1990-04-01