含钛铌铁精矿含碳球团熔分过程试验研究
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摘要
为了实现我国白云鄂博地区含钛铌铁精矿资源的高效利用,以含钛铌铁精矿为原料,采用预还原-熔分的加热制度,研究熔分温度、熔分时间和碱度对含钛铌铁精矿含碳球团熔分行为以及渣系性质的影响.进一步采用X射线衍射、扫描电子显微镜等手段表征含碳球团在熔分过程中的微观结构及物相变化.实验结果表明:金属化率86.31%的预还原含钛铌铁精矿含碳球团在1 400℃下熔分12 min后可实现渣铁有效分离,获得珠铁和富铌渣.随碱度升高,渣的熔点升高,渣的流动性指数降低,碱度为1.0时,球团的熔分效果较优;随熔分时间增加,含钛铌铁精矿含碳球团中的Ca_2Ti_2O_6相减少,Ca(Ti0.4Fe0.3Nb0.3)O3相增加,钙钛铌共生物的尺寸增加,呈十字树枝状.
Effects of the melting-separation temperature, melting-separation time and slag basicity on the melting-separation behavior of carbon composite pellets in Ti-Nb-bearing Fe concentrate and the properties of slag were studied by preproduction-melting-separation experiment in order to realize efficient utilization of Ti-Nb-bearing Fe concentrate in Bayan Obo Area, Inner Mongolia, with Ti-Nb-bearing Fe concentrate being the raw material. Moreover, the microstructure and phase transformation of pellets were characterized by XRD and SEM during melting-separation process. Results showed that complete slag-metal separation of reduced pellets whose metallization rate was 86.31 % could be realized after the melting-separation lasted12 min at 1 400 ℃. Besides, iron nuggets and Nb-enriched slag were also obtained. The melting point of slag increased and the fluidity index of slag decreased with the increase of basicity. The best melting-separation effect could be achieved when slag basicity was 1.0. With the increase of melting-separation time, Ca2 Ti2 O6 transformed gradually to Ca(Ti0.4 Fe0.3 Nb0.3)O3 and the size of Ca(Ti0.4 Fe0.3 Nb0.3)O3 increased.
Effects of the melting-separation temperature, melting-separation time and slag basicity on the melting-separation behavior of carbon composite pellets in Ti-Nb-bearing Fe concentrate and the properties of slag were studied by preproduction-melting-separation experiment in order to realize efficient utilization of Ti-Nb-bearing Fe concentrate in Bayan Obo Area, Inner Mongolia, with Ti-Nb-bearing Fe concentrate being the raw material. Moreover, the microstructure and phase transformation of pellets were characterized by XRD and SEM during melting-separation process. Results showed that complete slag-metal separation of reduced pellets whose metallization rate was 86.31 % could be realized after the melting-separation lasted12 min at 1 400 ℃. Besides, iron nuggets and Nb-enriched slag were also obtained. The melting point of slag increased and the fluidity index of slag decreased with the increase of basicity. The best melting-separation effect could be achieved when slag basicity was 1.0. With the increase of melting-separation time, Ca2 Ti2 O6 transformed gradually to Ca(Ti0.4 Fe0.3 Nb0.3)O3 and the size of Ca(Ti0.4 Fe0.3 Nb0.3)O3 increased.
引文
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[22]田野,陈树军,吕庆,等.碱金属和Ti O2对高炉炉渣流动性的影响[J].钢铁钒钛,2016,37(5):91-95.
[23]叶青,冯兴宇,杨泰胜,等.固溶时间对Cu-Ni-Si-Mg合金组织性能的影响[J].有色金属科学与工程,2017,8(3):79-83.
[24]张波,姜茂发,亓捷,等.Ca O-Si O2-Al2O3-Fe O-Ca F2-La2O3-Nb2O5-Ti O2渣系的活度计算模型[J].东北大学学报(自然科学版),2011,32(4):524-528.
[25]何福萍,刘峰,李建云,等.固溶方式及时效对Al-Mg-Si-Cu合金组织及性能的影响[J].有色金属科学与工程,2013,4(1):44-48.
[2]任俊,王文梅,卢寿慈.铌资源的综合利用[J].国外金属矿选矿,1998(1):28-32.
[3]徐广尧.包头铌资源综合利用关键技术研究[C]//中国稀土资源综合利用与环境保护研讨会.2007.
[4]王云,朱荣,郭亚光,等.铜渣还原磁选工艺实验研究[J].有色金属科学与工程,2014,5(5):61-67.
[5]蒋曼,孙体昌,寇珏,等.含铌铁精矿煤基直接还原过程中铌的行为研究[J].稀有金属,2011,35(5):731-735.
[6]姚玺,郭汉杰,李永麒,等.氢气在不同还原条件还原磁铁矿的试验研究[J].有色金属科学与工程,2015,6(5):12-16.
[7]W ANG G,WANG J S,DING Y G.New separation method of boron and iron from ludwigite based on carbon bearing pellet reduction and melting technology[J].ISIJ International,2012,52(1):45-51.
[8]郭学益,刘静欣,田庆华,等.有色金属复杂资源低温碱性熔炼原理与方法[J].有色金属科学与工程,2013(2):8-13.
[9]胡伟,杨晓军,符寒光.含硼矿中硼的提取工艺技术现状及趋势[J].有色金属科学与工程,2015,6(6):65-70.
[10]DING Y,WANG J S,WANG G.Innovative methodology for separating of rare earth and iron from bayan obo complex iron ore[J].ISIJ International,2012,52(10):1772-1777.
[11]侯栋科,彭兵,柴立元,等.锌焙砂的选择性还原焙烧硫酸浸出工艺研究[J].有色金属科学与工程,2014,5(1):1-8.
[12]胡伟,杨晓军,符寒光.含硼矿中硼的提取工艺技术现状及趋势[J].有色金属科学与工程,2015,6(6):65-70.
[13]苍大强.国内外冶金工业源头节能减排的新方法、新技术[J].有色金属科学与工程,2015,6(6):1-6.
[14]祁成林,张建良,陈永星,等.烧结熔剂高温特性的实验研究[J].过程工程学报,2009,9(1):266-269.
[15]LIU X,WU S,HUANG W.Influence of high temperature interaction between sinter and lump ores on the formation behavior of primary-slags in blast furnace[J].ISIJ International,2014,54(9):2089-2096.
[16]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(9):1166-1173.
[17]李光森,李小刚,金明芳,等.含氟烧结矿粘结相流动性的研究[C]//全国炼铁生产技术会议暨炼铁年会.2006.
[18]王艺慈,罗果萍,柏京波,等.F、K、Na对烧结固相反应影响的研究[J].钢铁,2008,43(7):12-15.
[19]吴秋玲.渣的粘度和润湿性与石墨的关系[J].耐火与石灰,2001,26(2):54-59.
[20]HYUNSOO K,GYU K J.The Role of molten slag in iron melting process for the direct contact carburization:wetting and separation[J].Isij International,2010,50(8):1099-1106.
[21]林向飞,康巍,李红英.硼和稀土对铝阴极板耐腐蚀性能的影响[J].有色金属科学与工程,2017,8(3):42-47.
[22]田野,陈树军,吕庆,等.碱金属和Ti O2对高炉炉渣流动性的影响[J].钢铁钒钛,2016,37(5):91-95.
[23]叶青,冯兴宇,杨泰胜,等.固溶时间对Cu-Ni-Si-Mg合金组织性能的影响[J].有色金属科学与工程,2017,8(3):79-83.
[24]张波,姜茂发,亓捷,等.Ca O-Si O2-Al2O3-Fe O-Ca F2-La2O3-Nb2O5-Ti O2渣系的活度计算模型[J].东北大学学报(自然科学版),2011,32(4):524-528.
[25]何福萍,刘峰,李建云,等.固溶方式及时效对Al-Mg-Si-Cu合金组织及性能的影响[J].有色金属科学与工程,2013,4(1):44-48.