钒钛磁铁精矿一步煤基直接还原—熔分的研究
|
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Na_6Al_4Si_4O_(17)、CaTiO_3、NaAlSiO_4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。
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 Na_6Al_4Si_4O_(17),CaTiO_3 and NaAlSiO_4.Vanadium mainly exists in Ti bearing slag phase while hardly exist in metallic iron phase.
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 Na_6Al_4Si_4O_(17),CaTiO_3 and NaAlSiO_4.Vanadium mainly exists in Ti bearing slag phase while hardly exist in metallic iron phase.
引文
[1]陈露露.我国钒钛磁铁矿资源利用现状[J].中国资源综合利用,2015,33(10):31-33.
[2]杜鹤桂,杨兆祥,李永镇.高炉冶炼钒钛磁铁矿原理[M].北京:科学出版社,1996:1-30.
[3]杨绍利.钒钛磁铁矿非高炉冶炼技术[M].北京:冶金工业出版社,2012:1-74.
[4]ZHONG B,XUE T,ZHAO L,et al.Preparation of Ti-enriched slag from V-bearing titanomagnetite by twostage hydrochloric acid leaching route[J].Separation&Purification Technology,2014,137(11):59-65.
[5]SHI L Y,ZHEN Y L,CHEN D S,et al.Carbothermic reduction of vanadium-titanium magnetite in molten NaOH[J].ISIJ International,2018,58(4):627-632.
[6]CHEN D,ZHAO L,LIU Y,et al.A novel process for recovery of iron,titanium,and vanadium from titanomagnetite concentrates:NaOH molten salt roasting and water leaching processes[J].Journal of Hazardous Materials,2013,244-245(2):588-595.
[7]何桂珍,都兴红,张凯,等.红格矿深还原-熔分过程及钒、铬走向的研究[J].材料与冶金学报,2014,13(1):15-19.
[8]高建军,洪陆阔,徐洪军,等.钒钛磁铁矿金属化球团还原熔分试验及渣相分析[J].有色金属(冶炼部分),2018(3):14-18.
[9]张艳华,龙红明,春铁军,等.钒钛磁铁矿深度直接还原熔分提铁[J].钢铁研究学报,2016,28(9):17-23.
[10]古明远,曹志成,吴道洪.钒钛磁铁矿直接还原-熔分工艺的研究[C]//中国金属学会青年学术年会,北京,2012:45-48.
[11]宁晓宇,薛庆国,王广,等.含碳球团直接还原熔分机理[J].北京科技大学学报,2014,36(9):1166-1173.
[12]吕亚男,郭宇峰,陈栋.添加剂强化钒钛磁铁精矿还原的研究[J].有色金属(冶炼部分),2016(6):9-12.
[13]ZHOU L H,ZENG F H.Statistical analysis of the effect of Na2CO3 as additive on the reduction of vanadictitanomagnetite-coal mixed pellets[J].Advanced Materials Research,2010,97-101:465-470.
[2]杜鹤桂,杨兆祥,李永镇.高炉冶炼钒钛磁铁矿原理[M].北京:科学出版社,1996:1-30.
[3]杨绍利.钒钛磁铁矿非高炉冶炼技术[M].北京:冶金工业出版社,2012:1-74.
[4]ZHONG B,XUE T,ZHAO L,et al.Preparation of Ti-enriched slag from V-bearing titanomagnetite by twostage hydrochloric acid leaching route[J].Separation&Purification Technology,2014,137(11):59-65.
[5]SHI L Y,ZHEN Y L,CHEN D S,et al.Carbothermic reduction of vanadium-titanium magnetite in molten NaOH[J].ISIJ International,2018,58(4):627-632.
[6]CHEN D,ZHAO L,LIU Y,et al.A novel process for recovery of iron,titanium,and vanadium from titanomagnetite concentrates:NaOH molten salt roasting and water leaching processes[J].Journal of Hazardous Materials,2013,244-245(2):588-595.
[7]何桂珍,都兴红,张凯,等.红格矿深还原-熔分过程及钒、铬走向的研究[J].材料与冶金学报,2014,13(1):15-19.
[8]高建军,洪陆阔,徐洪军,等.钒钛磁铁矿金属化球团还原熔分试验及渣相分析[J].有色金属(冶炼部分),2018(3):14-18.
[9]张艳华,龙红明,春铁军,等.钒钛磁铁矿深度直接还原熔分提铁[J].钢铁研究学报,2016,28(9):17-23.
[10]古明远,曹志成,吴道洪.钒钛磁铁矿直接还原-熔分工艺的研究[C]//中国金属学会青年学术年会,北京,2012:45-48.
[11]宁晓宇,薛庆国,王广,等.含碳球团直接还原熔分机理[J].北京科技大学学报,2014,36(9):1166-1173.
[12]吕亚男,郭宇峰,陈栋.添加剂强化钒钛磁铁精矿还原的研究[J].有色金属(冶炼部分),2016(6):9-12.
[13]ZHOU L H,ZENG F H.Statistical analysis of the effect of Na2CO3 as additive on the reduction of vanadictitanomagnetite-coal mixed pellets[J].Advanced Materials Research,2010,97-101:465-470.