As the raw material for hot metal containing chromium from 20% to 40%, carbon-beared chromite pellets made from three kinds of typical chromite were reduced at 1 300 ℃ for 30 min and then kept at 1 550-1 600 ℃ for 1...As the raw material for hot metal containing chromium from 20% to 40%, carbon-beared chromite pellets made from three kinds of typical chromite were reduced at 1 300 ℃ for 30 min and then kept at 1 550-1 600 ℃ for 10 min. The effect of Cr 2O 3/FeO mass ratio in pellets on chromium content in hot metal and the yield of chromium were investigated. The results indicated that the highest chromium content is in hot metal produced from South African UG2 ore, but slag volume produced with Indian chromite is the smallest. The yield of chromium is only 60% to 75%, due to short melting time, high melting point and large surface tension of the slag with high Al 2O 3 and MgO content, which influences the separation between metal and slag.展开更多
The smelting-separation process for metallized pellets of vanadium-bearing titanomagnetite concentrates was studied.The influences of smelting temperature,smelting time,and the basicity of the metallized pellet on van...The smelting-separation process for metallized pellets of vanadium-bearing titanomagnetite concentrates was studied.The influences of smelting temperature,smelting time,and the basicity of the metallized pellet on vanadium and iron recovery were investigated.The characteristics of titanium slag were analyzed using X-ray diffraction,energy dispersive spectroscopy,and mineralographic microscopic analysis.The results demonstrate that appropriate increases in smelting temperature and smelting time can improve the vanadium and iron recovery from metallized pellets and are beneficial for the slag-iron separation.Although increasing the basicity of the metallized pellet can considerably improve the vanadium and iron recovery,the TiO;grade of titanium slag was decreased.Under the optimal conditions,90.17% of vanadium and 92.98% of iron in the metallized pellet were recovered,and the TiO;grade of titanium slag was 55.01%.It was found that anosovite,augite,spinel,glassiness,and metallic iron were the main mineral phases of the titanium slag.展开更多
对提钒尾渣中钒、铬氧化物碳热还原热力学进行分析计算,结果表明,钒氧化物的还原顺序为：V2O5→VO2→V2O3→VO→VC→[V],铬氧化物的还原顺序为：Cr O3→Cr O2→Cr2O3→Cr4C→[Cr]。采用50 k VA电弧炉进行提钒尾渣含碳球团进行熔融还原,...对提钒尾渣中钒、铬氧化物碳热还原热力学进行分析计算,结果表明,钒氧化物的还原顺序为：V2O5→VO2→V2O3→VO→VC→[V],铬氧化物的还原顺序为：Cr O3→Cr O2→Cr2O3→Cr4C→[Cr]。采用50 k VA电弧炉进行提钒尾渣含碳球团进行熔融还原,考察了配碳量和碱度对钒铬在渣铁间的分配比和铁、钒、铬回收率的影响。试验结果表明：随着配碳量的增加,钒、铬在渣铁间分配比增加,铁、钒、铬的回收率下降;随着碱度的增加,钒、铬在渣铁间分配比下降,铁、钒、铬回收率升高;提钒尾渣电弧炉熔融还原较适宜的配碳量为12%～14%,较适宜的碱度为1.0～1.1,在此条件下,铁、钒、铬的回收率可达90%以上。展开更多
文摘As the raw material for hot metal containing chromium from 20% to 40%, carbon-beared chromite pellets made from three kinds of typical chromite were reduced at 1 300 ℃ for 30 min and then kept at 1 550-1 600 ℃ for 10 min. The effect of Cr 2O 3/FeO mass ratio in pellets on chromium content in hot metal and the yield of chromium were investigated. The results indicated that the highest chromium content is in hot metal produced from South African UG2 ore, but slag volume produced with Indian chromite is the smallest. The yield of chromium is only 60% to 75%, due to short melting time, high melting point and large surface tension of the slag with high Al 2O 3 and MgO content, which influences the separation between metal and slag.
基金Item Sponsored by National Natural Science Foundation of China(51174122)
文摘The smelting-separation process for metallized pellets of vanadium-bearing titanomagnetite concentrates was studied.The influences of smelting temperature,smelting time,and the basicity of the metallized pellet on vanadium and iron recovery were investigated.The characteristics of titanium slag were analyzed using X-ray diffraction,energy dispersive spectroscopy,and mineralographic microscopic analysis.The results demonstrate that appropriate increases in smelting temperature and smelting time can improve the vanadium and iron recovery from metallized pellets and are beneficial for the slag-iron separation.Although increasing the basicity of the metallized pellet can considerably improve the vanadium and iron recovery,the TiO;grade of titanium slag was decreased.Under the optimal conditions,90.17% of vanadium and 92.98% of iron in the metallized pellet were recovered,and the TiO;grade of titanium slag was 55.01%.It was found that anosovite,augite,spinel,glassiness,and metallic iron were the main mineral phases of the titanium slag.
文摘对提钒尾渣中钒、铬氧化物碳热还原热力学进行分析计算,结果表明,钒氧化物的还原顺序为：V2O5→VO2→V2O3→VO→VC→[V],铬氧化物的还原顺序为：Cr O3→Cr O2→Cr2O3→Cr4C→[Cr]。采用50 k VA电弧炉进行提钒尾渣含碳球团进行熔融还原,考察了配碳量和碱度对钒铬在渣铁间的分配比和铁、钒、铬回收率的影响。试验结果表明：随着配碳量的增加,钒、铬在渣铁间分配比增加,铁、钒、铬的回收率下降;随着碱度的增加,钒、铬在渣铁间分配比下降,铁、钒、铬回收率升高;提钒尾渣电弧炉熔融还原较适宜的配碳量为12%～14%,较适宜的碱度为1.0～1.1,在此条件下,铁、钒、铬的回收率可达90%以上。
