A technology for suspension magnetization roasting−magnetic separation was proposed to separate iron minerals for recovery.The optimum parameters were as follows:a roasting temperature of 650℃,a roasting time of 20 m...A technology for suspension magnetization roasting−magnetic separation was proposed to separate iron minerals for recovery.The optimum parameters were as follows:a roasting temperature of 650℃,a roasting time of 20 min,a CO concentration of 20%,and particles with a size less than 37μm accounting for 67.14%of the roasted product.The total iron content and iron recovery of the magnetic concentrate were 56.71%and 90.50%,respectively.The phase transformation,magnetic transition,and microstructure evolution were systematically characterized through iron chemical phase analysis,X-ray diffraction,vibrating sample magnetometry,X-ray photoelectron spectroscopy,and transmission electron microscopy.The results demonstrated the transformation of hematite to magnetite,with the iron content in magnetite increasing from 0.41%in the raw ore to 91.47%in the roasted product.展开更多
Magnetic separation of iron in rare-earth tailings was achieved by magnetizing roast process with coal as reductant. Effects of the temperature, carbon to oxygen ratio, and cooling type on magnetic susceptibility and ...Magnetic separation of iron in rare-earth tailings was achieved by magnetizing roast process with coal as reductant. Effects of the temperature, carbon to oxygen ratio, and cooling type on magnetic susceptibility and composition of rare-earth tailings were investigated. The results show that roast conditions with the temperature of 650℃, carbon to oxygen ratio of 3.85, and holding time of 2.5 h are in favor of reduction of Fe_2O_3 to Fe_3O_4 when the roasted rare-earth tailings is cooled along with furnace. Under these roast conditions, magnetic susceptibility of rare-earth tailings is 2.36 that is very close to theoretical value（2.33）. However, magnetic separation results of iron in rare-earth tailings cooled along with furnace are not satisfactory. Through comparing magnetic separation results of iron in rare-earth tailings cooled by different ways, it is found that water cooling is more favored of magnetic separation of iron in the roasted rare-earth tailings than furnace cooling and air cooling. Grade and recovery of iron in concentrate from rare-earth tailings cooled by water are 45.00%-49.00% and 65.00%-77.50%, respectively.展开更多
基金financially supported by the National Natural Science Foundation of China (Nos.51904058,52174240)the Fundamental Research Funds for the Central Universities,China (No.2101023)。
文摘A technology for suspension magnetization roasting−magnetic separation was proposed to separate iron minerals for recovery.The optimum parameters were as follows:a roasting temperature of 650℃,a roasting time of 20 min,a CO concentration of 20%,and particles with a size less than 37μm accounting for 67.14%of the roasted product.The total iron content and iron recovery of the magnetic concentrate were 56.71%and 90.50%,respectively.The phase transformation,magnetic transition,and microstructure evolution were systematically characterized through iron chemical phase analysis,X-ray diffraction,vibrating sample magnetometry,X-ray photoelectron spectroscopy,and transmission electron microscopy.The results demonstrated the transformation of hematite to magnetite,with the iron content in magnetite increasing from 0.41%in the raw ore to 91.47%in the roasted product.
基金Project(2012CBA01205)supported by National Basic Research Program of ChinaProjects(50934004,51274061)supported by the National Natural Science Foundation of ChinaProject(N110502002)supported by the Fundamental Research Funds for the Central Universities,China
文摘Magnetic separation of iron in rare-earth tailings was achieved by magnetizing roast process with coal as reductant. Effects of the temperature, carbon to oxygen ratio, and cooling type on magnetic susceptibility and composition of rare-earth tailings were investigated. The results show that roast conditions with the temperature of 650℃, carbon to oxygen ratio of 3.85, and holding time of 2.5 h are in favor of reduction of Fe_2O_3 to Fe_3O_4 when the roasted rare-earth tailings is cooled along with furnace. Under these roast conditions, magnetic susceptibility of rare-earth tailings is 2.36 that is very close to theoretical value（2.33）. However, magnetic separation results of iron in rare-earth tailings cooled along with furnace are not satisfactory. Through comparing magnetic separation results of iron in rare-earth tailings cooled by different ways, it is found that water cooling is more favored of magnetic separation of iron in the roasted rare-earth tailings than furnace cooling and air cooling. Grade and recovery of iron in concentrate from rare-earth tailings cooled by water are 45.00%-49.00% and 65.00%-77.50%, respectively.
