攀钢半钢冶炼转炉脱磷工艺技术研究
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摘要
针对攀钢半钢冶炼时辅料消耗大、终渣氧化性高且脱磷效果不佳的问题,通过对转炉脱磷理论以及冶炼过程脱磷规律的研究,确定了前期脱磷率偏低、中期返干是影响脱磷率的主要因素。通过对终渣岩相的进一步分析,确定了磷在渣中的主要富集相,解释了后期依靠提高炉渣氧化性和增加辅料消耗不能显著提高脱磷率的原因。通过采用"留渣加料"、含铝复合造渣剂造渣以及降低冶炼后期枪位等技术措施,转炉成渣时间由4. 3 min缩短到3. 2 min,返干比例由由56%显著降低到18%,在总渣料消耗平均减少5. 69 kg/t的情况下转炉冶炼全程脱磷率由79. 4%提高到84. 1%,终渣TFe质量分数平均降低2. 49%。通过对脱磷工艺参数的优化,在提高转炉脱磷效率的同时,降低了转炉冶炼成本。
To solve the problem of high slagging materials consumption,high oxidablitiy of slag and low dephosphorization effect,theory of dephosphorization and dephosphorization rules were researched and factors affected dephosphorization rate were confirmed. And according to the lithofacies of slag,enriched phase of phosphorous in slag was found out,reasons of why dephosphorization rate couldn't be improved remarkable by high slagging materials consumption and high oxidablitiy were explained. By adopting the measures of "slag-remaining charging material",aluminiferous-slag former and lower the lance position,slag-forming time was reduced from 4. 3 min to 3. 2 min,ration of re-dry was reduced remarkably from 56 % to 18 %,total dephosphorization rate was improved from 79. 4 % to 84. 1 % under the condition that total material consumption was reduced by 5. 69 kg/t. In addition,TFe content of slag was reduced by 2. 49 % on average.According to optimization of dephosphorization parameters,dephosphorization rate was improved and cost of BOF refining was reduced as well.
To solve the problem of high slagging materials consumption,high oxidablitiy of slag and low dephosphorization effect,theory of dephosphorization and dephosphorization rules were researched and factors affected dephosphorization rate were confirmed. And according to the lithofacies of slag,enriched phase of phosphorous in slag was found out,reasons of why dephosphorization rate couldn't be improved remarkable by high slagging materials consumption and high oxidablitiy were explained. By adopting the measures of "slag-remaining charging material",aluminiferous-slag former and lower the lance position,slag-forming time was reduced from 4. 3 min to 3. 2 min,ration of re-dry was reduced remarkably from 56 % to 18 %,total dephosphorization rate was improved from 79. 4 % to 84. 1 % under the condition that total material consumption was reduced by 5. 69 kg/t. In addition,TFe content of slag was reduced by 2. 49 % on average.According to optimization of dephosphorization parameters,dephosphorization rate was improved and cost of BOF refining was reduced as well.
引文
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[15]BODSWORTH C,BELL H B. Physical chemistry of iron and steel manufacture[M]. Longman,1972.
[16]杨文远,王明林,崔淑贤,等.炉渣的岩相研究在转炉炼钢中的应用[J].钢铁研究学报,2007,19(12):10-15.
[17]TSAI Hwantang,潘秀兰.渣中Ti O2和Al2O3对转炉溅渣护炉的影响[J].鞍钢技术,2004(5):58-62,66.
[2]SON P K,KASHIWAYA Y. Phosphorous partition in dephosphorization slag occurring with crystallization at initial stage of solidification[J]. Tetsu-to-Hagane,2008,48(9):1165-1174.
[3]徐文杰,李安东,刘国勇.复吹转炉冶炼X65管线钢脱磷工艺研究[J].上海金属,2009,31(4):21-24.
[4]杨文远,郑丛杰,杨立红,等.大型转炉炼钢脱磷的研究[J].炼钢,2002,18(1):30-34.
[5]乐可襄,李杰.用CaO-Fe2O3基熔剂进行铁水预处理脱磷[J].钢铁研究学报,2006(9):10-12,25.
[6]李峻,曾加庆,高建军,等.低碱度渣铁水预处理脱磷研究[J].钢铁,2006(8):28-30,33.
[7]王海川,张友平,郭上型,等.铁水氧势对铁水预处理脱硅脱磷的影响[J].钢铁研究学报,2000(6):11-15.
[8]乐可襄,王世俊,王海川,等.在铁水预处理中CaO-Fe2O3-CaF2基粉剂脱磷工艺和影响因素的探讨[J].钢铁,2002(7):20-22,32.
[9]高文芳,陈钢,王金平,等.顶底复吹转炉高效脱磷研究[J].钢铁,2009,44(9):36-41.
[10]焦玉莉. 120 t复吹转炉单渣法高拉碳工艺[J].钢铁,2014,49(10):30-33.
[11]汪成义,杨利彬,林腾昌,等.顶底复吹转炉双渣冶炼“脱磷窗口”温度控制模型[J].特殊钢,2017,38(6):1-5.
[12]何肖飞,王新华,陈书浩,等.攀钢转炉双渣法脱磷的试验研究[J].钢铁,2012,47(4):32-37.
[13]杨文远,侯春,崔怀周,等.转炉双联法炼钢的水模试验[J].钢铁,2014,49(1):39-44.
[14]陈均,江南红,龚洪君,等. 200 t顶底复吹转炉半钢冶炼深脱磷工艺实践[J].特殊钢,2017,38(6):40-44.
[15]BODSWORTH C,BELL H B. Physical chemistry of iron and steel manufacture[M]. Longman,1972.
[16]杨文远,王明林,崔淑贤,等.炉渣的岩相研究在转炉炼钢中的应用[J].钢铁研究学报,2007,19(12):10-15.
[17]TSAI Hwantang,潘秀兰.渣中Ti O2和Al2O3对转炉溅渣护炉的影响[J].鞍钢技术,2004(5):58-62,66.