脱磷剂对铁精矿预还原烧结过程中气化脱磷的影响
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摘要
白云鄂博铁精矿磷含量较高为0. 08%,磷主要以氟磷灰石的形式存在。为了探索白云鄂博铁精矿预还原烧结过程中磷的气化脱除机理,利用Factsage6. 2热力学软件模拟研究了不同脱磷剂对铁精矿预还原烧结过程中气化脱磷的影响,并以热力学计算为基础,采用真空管式电阻炉进行了还原烧结脱磷试验,对烧结产物的磷含量进行了检测。结果表明,碳直接还原烧结脱磷所需温度较高,气化脱磷率较低;配加Si O_2和Na_2CO_3作为辅助脱磷剂,能有效降低碳的还原脱磷温度,使磷的气化脱除率显著升高,在配碳20%、SiO_23%、Na_2CO_31%的条件下,磷的气化脱除率可以达到29%。
The concentration of phosphorus in Baiyunebo iron ore concentrate is as high as 0. 08%,and phosphorus is mainly in the form of fluorapatite. In order to explore the mechanism of phosphorus gasification removal in pre-reduction sintering of Baiyunebo iron ore concentrate,the influence of different dephosphorization agents on the gasification and dephosphorization of iron ore concentrate during pre-reduction sintering was simulated by Factsage thermodynamics software. Based on the thermodynamics calculation,a reduction sintering dephosphorization test was conducted using a vacuum tube resistance furnace,and the phosphorus content of the calcined product was examined. The results show that the temperature required for dephosphorization of carbon during the direct reduction sintering is high,and the dephosphorization rate is low; adding SiO_2 and Na_2CO_3 as the auxiliary dephosphorization agent can effectively reduce the reduction dephosphorization temperature of carbon and make the gasification dephosphorization rate rise remarkably. Under the condition of carbon 20%,SiO_2 3% and Na_2CO_3 1%,the gasification removal rate of phosphorus can reach 26%.
The concentration of phosphorus in Baiyunebo iron ore concentrate is as high as 0. 08%,and phosphorus is mainly in the form of fluorapatite. In order to explore the mechanism of phosphorus gasification removal in pre-reduction sintering of Baiyunebo iron ore concentrate,the influence of different dephosphorization agents on the gasification and dephosphorization of iron ore concentrate during pre-reduction sintering was simulated by Factsage thermodynamics software. Based on the thermodynamics calculation,a reduction sintering dephosphorization test was conducted using a vacuum tube resistance furnace,and the phosphorus content of the calcined product was examined. The results show that the temperature required for dephosphorization of carbon during the direct reduction sintering is high,and the dephosphorization rate is low; adding SiO_2 and Na_2CO_3 as the auxiliary dephosphorization agent can effectively reduce the reduction dephosphorization temperature of carbon and make the gasification dephosphorization rate rise remarkably. Under the condition of carbon 20%,SiO_2 3% and Na_2CO_3 1%,the gasification removal rate of phosphorus can reach 26%.
引文
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[2]牟英杰,周志刚,洪国敏.包头市白云鄂博铁矿区规划[C]//中国稀土资源综合利用与环境保护研讨会. 2012:136-140..
[3]柳建勇,赵永岗,张速旺.白云鄂博矿矿极贫铁矿石和难选铁矿石资源开发利用前景分析[J].金属矿山,2008(增刊):170-174.
[4]周继程,薛正良,张海峰,等.高磷鲕状赤铁矿脱磷技术研究[J].炼铁,2007,26(2):40-43.
[5]武杏荣,安吉南,陈荣欢,等.转炉钢渣中磷的富集与富磷相长大[J].安徽工业大学学报(自然科学版),2010,27(3):233-237.
[6]王晓远,邢宏伟,田铁磊,等.微波焙烧对高磷铁矿气化脱磷的影响[J].烧结球团,2016,41(04):45-48.
[7] Tang Huiqing,Guo Zhancheng,Zhao Zhilong. Phosphorus removal of high phosphorus iron ore by gas-based reduction and melt separation[J]. Journal of Iron and Steel Research,International,2010,17(9):1-6.
[8]孙永升,李淑菲,史广全,等.某鲕状赤铁矿深度还原试验研究[J].金属矿山,2009,V39(5):80-83.
[9]范德增,任允芙,杨宗义.海南铁矿粉预还原烧结矿的矿物组成与其性能的关系[J].钢铁,1997(08):6-10.
[10]张伟,刘卫星,田铁磊,等.脱磷剂对高磷钢渣气化脱磷率影响的研究[J].烧结球团,2014,39(1):47-50.
[11]任多振.高磷鲕状赤铁矿深度还原过程中磷的反应特性研究[D].沈阳:东北大学,2014.
[12]张伟,付俊凯,王辉,等.高磷赤铁矿气化脱磷反应活化能研究[J].烧结球团,2015,40(04):12-15+19.