摘要:
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:CrO3→CrO2→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。
Abstract:
The thermodynamics of carbothermal reduction of vanadium and chromium oxides in vanadium tailings was calculated and analyzed. It is shown that the reduction sequence of vanadium oxide is V2O5 →VO2→V2O3→VO→VC→[V],and the reduction sequence of chromium oxide is CrO3→CrO2→Cr2O3→Cr4C →[Cr]. Using electric arc furnace (50 k VA) for the carbothermal reduction of carbon-containing pellet of vanadium tailings,the effects of carbon ratio and alkalinity on the distribution ratio of V and Cr between slag and metal phase,the recovery rate of Fe,V and Cr,were investigated. The results indicate that with increase in carbon ratio,distribution ratio of V and Cr between slag and metal phase increases and the recovery rate of Fe,V and Cr decreases. With increase in alkalinity,distribution ratio of V and Cr between slag and metal phase decreases in association with increase in recovery rate of Fe,V and Cr. The optimum process parameters are proposed as follows: 12%~14% of carbon ratio and 1.0~1.1 of alkalinity,under which the recovery rate of Fe,V and Cr can exceed 90%.
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