【摘要】 以煤为还原剂、氢氧化钠为添加剂,采用一步煤基直接还原—熔分工艺对国内某钒钛磁铁精矿进行研究。考察温度、时间、氢氧化钠添加量和配碳量对还原—熔分效果、铁回收率和钒迁移的影响。结果表明,在温度1 300℃、时间4h、摩尔比C/Fe=2.6,氢氧化钠添加量50%的最优条件下,铁回收率为99.8%,渣中钒含量为1.34%。渣主要由Na₆Al₄Si₄O₁₇、CaTiO₃、NaAlSiO₄等组成,钒主要赋存在含钛渣相中,金属铁相中几乎无钒的存在。更多还原

【Abstract】 Vanadium titano-magnetite concentrate was studied by one-step coal-based direct reductionmelting process with coal as reductant and sodium hydroxide as additive.Effects of temperature,time and dosage of sodium hydroxide and carbon on reduction-melting,iron recovery and vanadium migration were investigated.The results show that iron recovery is 99.8%and vanadium content in slag is 1.34% under the optimum conditions including temperature of 1 300 ℃,time of 4 h,C/Fe molar ratio of 2.6,and NaOH dosage of 50%.Main components of slag include Na₆Al₄Si₄O₁₇,CaTiO₃ and NaAlSiO₄.Vanadium mainly exists in Ti bearing slag phase while hardly exist in metallic iron phase.更多还原