BaSO_4对球团矿抗压强度的影响
|
摘要
以磁铁精矿粉和膨润土为原料、BaSO_4为添加剂生产球团,基于直接配入法的组分调控方式,结合热重实验结果,研究了BaSO_4对球团矿抗压强度的影响,并采用压汞仪、矿相显微镜和扫描电子显微镜-能谱仪等分析了球团矿焙烧过程中BaSO_4对球团矿抗压强度的影响机理和钡的转变行为。结果表明,随BaSO_4含量增加,预热球团抗压强度变化较小,焙烧球团抗压强度先升高后逐渐降低。BaSO_4添加量小于1.5wt%时,有利于焙烧球团内部磁铁矿氧化和新生赤铁矿再结晶,孔隙率略有增加,内部氧分压提高,增强了晶粒间的固结程度,球团抗压强度提高。BaSO_4含量进一步增加,球团矿内部孔隙尺寸增大,降低了内部基体的整体性,使晶粒间的连晶程度减弱,球团矿抗压强度降低。
The magnetite concentrate powder and bentonite which were obtained from a domestic iron and steel enterprise were used as raw material to produce pellets. The chemical composition of pellets was adjusted by adding different proportions of raw materials, and the effect of BaSO4 on compressive strength of pellets was studied on the basis of the thermogravimetric experiment results in this paper. The influence mechanism of BaSO4 on compressive strength of pellets and the transformation behavior of barium in pellets were analyzed mostly by using the mercury porosimetry, mineral phase microscope andscanning electron microscope-energy dispersive spectroscopy(SEM-EDS). The results showed that the compressive strength of preheated pellets changed little and the compressive strength of roasted pellets increased firstly and then decreased gradually with the mass fraction of BaSO4 increasing. As far as the roasted pellets were concerned, the porosity increased slightly and interior oxygen partial pressure was also increased when BaSO4 content was less than 1.5 wt%, which contribute to the oxidation of magnetite and recrystallization of regenerated hematite in pellets. In addition, the degree of bonding between grains was strengthened. Owing to the above-mentioned reasons, the compressive strength of pellets increased. However, when the mass fraction of BaSO4 was further increased, the large size pores were produced, which destroys the integrity of the matrix inside the pellets and decreased the degree of crystalline between the grains. Therefore, the compressive strength of pellets was reduced when the content of BaSO4 was more than 1.5 wt%.
The magnetite concentrate powder and bentonite which were obtained from a domestic iron and steel enterprise were used as raw material to produce pellets. The chemical composition of pellets was adjusted by adding different proportions of raw materials, and the effect of BaSO4 on compressive strength of pellets was studied on the basis of the thermogravimetric experiment results in this paper. The influence mechanism of BaSO4 on compressive strength of pellets and the transformation behavior of barium in pellets were analyzed mostly by using the mercury porosimetry, mineral phase microscope andscanning electron microscope-energy dispersive spectroscopy(SEM-EDS). The results showed that the compressive strength of preheated pellets changed little and the compressive strength of roasted pellets increased firstly and then decreased gradually with the mass fraction of BaSO4 increasing. As far as the roasted pellets were concerned, the porosity increased slightly and interior oxygen partial pressure was also increased when BaSO4 content was less than 1.5 wt%, which contribute to the oxidation of magnetite and recrystallization of regenerated hematite in pellets. In addition, the degree of bonding between grains was strengthened. Owing to the above-mentioned reasons, the compressive strength of pellets increased. However, when the mass fraction of BaSO4 was further increased, the large size pores were produced, which destroys the integrity of the matrix inside the pellets and decreased the degree of crystalline between the grains. Therefore, the compressive strength of pellets was reduced when the content of BaSO4 was more than 1.5 wt%.
引文
[1]唐敬坤,郭磊,郭占成,等.球团矿高温还原过程中抗压强度变化及机理[J].钢铁,2014,49(7):66-71.Tang J K,Guo L,Guo Z C,et al.Changes of hot compressive strength of iron ore pellets during reduction process and mechanism[J].Iron and Steel,2014,49(7):66-71.
[2]Gao Q J,Shen F M,Wei G,et al.Effects of MgO containing additive on low-temperature metallurgical properties of oxidized pellet[J].Journal of Iron and Steel Research International,2013,20(7):25-28.
[3]叶匡吾.努力推进我国球团矿的生产[J].烧结球团,2007,32(5):1-5.Ye K W.Heavily push forward the pelletizing production inour country[J].Sintering&Pellets,2007,32(5):1-5.
[4]青格勒,王朝东,侯恩俭,等.低硅含镁球团矿抗压强度及冶金性能[J].钢铁研究学报,2014,26(4):7-12.Qing G L,Wang C D,Hou E J,et al.Compressive strength and metallurgical property of low silicon magnesium pellet[J].Journal of Iron and Steel Research,2014,26(4):7-12.
[5]Meral M,Pramanik S,Pal J.Role of MgO and its different minerals on properties of iron ore pellet[J].Transactions of the Indian Institute of Metals,2016,69(6):1141-1153.
[6]朱德庆,高子富,潘建,等.碱度及MgO质量分数对球团焙烧及冶金性能的影响[J].中南大学学报(自然科学版),2013,44(10):3963-3970.Zhu D Q,Gao Z F,Pan J,et al.Influence of pellet basicity and MgOcontent on roasting and metallurgical properties of pellets[J].Journal of Central South University(Science and Technology),2013,44(10):3963-3970.
[7]方觉,龚瑞娟,赵立树,等.球团矿氧化焙烧及还原过程中的强度变化[J].钢铁,2007,42(2):11-14.Fang J,Gong R J,Zhao L S,et al.Change of high temperature strength of pellets during roasting and reduction[J].Iron and Steel,2007,42(2):11-14.
[8]潘钊彬,郭占成,荣哲.球团矿不同气氛下的高温抗压强度[J].北京科技大学学报,2011,33(10):1209-1213.Pan Z B,Guo Z C,Rong Z.High temperature compressive strength of ore pellets in different atmospheres[J].Journal of University of Science and Technology Beijing,2011,33(10):1209-1213.
[9]周取定,任允芙,蒋烈英,等.酒钢强磁选赤精矿烧结的研究[J].钢铁,1988,23(6):5-11.Zhou Q D,Ren Y F,Jiang L Y,et al.Study of sintering of hematite concentrate from high intensity magnetic separator at Jiuquan Iron and Steel Co.[J].Iron and Steel,1988,23(6):5-11.
[10]任允芙,凤麟.酒钢含重晶石铁精矿在烧结过程中重晶石分解机理的研究[J].金属学报,1986,22(4):142-148.Ren Y F,Feng L.Mechanism of decomposition of barite in process of sintering Jiuquan barite-containing iron ore concentrate[J].Acta Metallurgica Sinica,1986,22(4):142-148.
[11]Zhang J L,Wang Z Y,Xing X D,et al.Effect of aluminum oxide on the compressive strength of pellets[J].International Journal of Minerals,Metallurgy,and Materials,2014,21(4):339-344.
[12]高强健,魏国,何奕波,等.MgO对球团矿抗压强度的影响[J].东北大学学报(自然科学版),2013,34(1):103-106.Gao Q J,Wei G,He Y B,et al.Effect of MgO on compressive strength of pellet[J].Journal of Northeastern University(Natural Science),2013,34(1):103-106.
[13]李圣辉,陈铁军,张一敏,等.含镁添加剂用于铁矿球团的试验研究[J].烧结球团,2011,36(1):33-37.Li S H,Chen T J,Zhang Y M,et al.Experimental study on application of Mg-bearing additives in iron ore pellet[J].Sintering&Pellets,2011,36(1):33-37.
[14]Shen F M,Gao Q J,Xin J,et al.Effect of magnesia on the compressive strength of pellets[J].International Journal of Minerals,Metallurgy,and Materials,2014,21(5):431-437.
[15]Semberg P,Rutqvist A,Andersson C,et al.Interactions between iron oxides and the additives quartzite,calcite and olivine in magnetite based pellets[J].ISIJ International,2011,51(2):173-180.
[16]陈许玲,刘树,甘敏,等.高钛球团焙烧行为及其强化技术[J].工程科学学报,2016,38(7):920-929.Chen X L,Liu S,Gan M,et al.Roasting behavior and enhancing technology of high-titanium pellets[J].Chinese Journal of Engineering,2016,38(7):920-929.
[17]曹龙,段东平,韩洪亮.高炉瓦斯灰含碳球团粘结剂研究[J].过程工程学报,2013,13(1):164-168.Cao L,Duan D P,Han H L.Study on roasting of carbon-containing pellets from blast furnace dust with different binders[J].The Chinese Journal of Process Engineering,2013,13(1):164-168.
[18]周明顺,王义栋,赵东明,等.高硫铁精矿配比对球团工艺参数及性能的影响[J].钢铁,2018,53(5):11-17.Zhou M S,Wang Y D,Zhao D M,et al.Effects of adding high-sulfur magnetite concentrate on pelletizing parameters and performance[J].Iron and Steel,2018,53(5):11-17.
[19]朱德庆,虎训,潘建,等.优化配矿强化西澳超细粒磁铁精矿球团焙烧研究[J].工程科学学报,2017,39(5):683-692.Zhu D Q,Hu X,Pan J,et al.Optimization of feed blends to enhance the roasting performance of pellets made from western Australian ultrafine magnetite concentrate[J].Chinese Journal of Engineering,2017,39(5):683-692.
[20]陈许玲,黄云松,范晓慧,等.钒钛磁铁矿球团氧化焙烧行为和固结特性[J].中南大学学报(自然科学版),2016,47(2):359-366.Chen X L,Huang Y S,Fan X H,et al.Oxidation roasting behavior and concretion properties of vanadium-titanium magnetite pellet[J].Journal of Central South University(Science and Technology),2016,47(2):359-366.
[21]陈耀明,李建.氧化球团矿中Fe2O3的结晶规律[J].中南大学学报(自然科学版),2007,38(1):70-73.Chen Y M,Li J.Crystal rule of Fe2O3 in oxidized pellet[J].Journal of Central South University(Science and Technology),2007,38(1):70-73.
[22]范建军,张文平,刘慈光,等.预热焙烧参数对超细粒度磁铁矿粉球团性能的影响[J].钢铁,2013,48(12):20-24.Fan J J,Zhang W P,Liu C G,et al.Effect of preheating and roasting parameters on pellet property of super-fine magnetite concentrate[J].Iron and Steel,2013,48(12):20-24.
[23]郑红霞,汪琦,潘喜峰.磁铁矿球团氧化机理的研究[J].烧结球团,2003,28(5):13-16.Zheng H X,Wang Q,Pan X F.Study on the oxidation mechanism of magnetite pellets[J].Sintering&Pellets,2003,28(5):13-16.
[2]Gao Q J,Shen F M,Wei G,et al.Effects of MgO containing additive on low-temperature metallurgical properties of oxidized pellet[J].Journal of Iron and Steel Research International,2013,20(7):25-28.
[3]叶匡吾.努力推进我国球团矿的生产[J].烧结球团,2007,32(5):1-5.Ye K W.Heavily push forward the pelletizing production inour country[J].Sintering&Pellets,2007,32(5):1-5.
[4]青格勒,王朝东,侯恩俭,等.低硅含镁球团矿抗压强度及冶金性能[J].钢铁研究学报,2014,26(4):7-12.Qing G L,Wang C D,Hou E J,et al.Compressive strength and metallurgical property of low silicon magnesium pellet[J].Journal of Iron and Steel Research,2014,26(4):7-12.
[5]Meral M,Pramanik S,Pal J.Role of MgO and its different minerals on properties of iron ore pellet[J].Transactions of the Indian Institute of Metals,2016,69(6):1141-1153.
[6]朱德庆,高子富,潘建,等.碱度及MgO质量分数对球团焙烧及冶金性能的影响[J].中南大学学报(自然科学版),2013,44(10):3963-3970.Zhu D Q,Gao Z F,Pan J,et al.Influence of pellet basicity and MgOcontent on roasting and metallurgical properties of pellets[J].Journal of Central South University(Science and Technology),2013,44(10):3963-3970.
[7]方觉,龚瑞娟,赵立树,等.球团矿氧化焙烧及还原过程中的强度变化[J].钢铁,2007,42(2):11-14.Fang J,Gong R J,Zhao L S,et al.Change of high temperature strength of pellets during roasting and reduction[J].Iron and Steel,2007,42(2):11-14.
[8]潘钊彬,郭占成,荣哲.球团矿不同气氛下的高温抗压强度[J].北京科技大学学报,2011,33(10):1209-1213.Pan Z B,Guo Z C,Rong Z.High temperature compressive strength of ore pellets in different atmospheres[J].Journal of University of Science and Technology Beijing,2011,33(10):1209-1213.
[9]周取定,任允芙,蒋烈英,等.酒钢强磁选赤精矿烧结的研究[J].钢铁,1988,23(6):5-11.Zhou Q D,Ren Y F,Jiang L Y,et al.Study of sintering of hematite concentrate from high intensity magnetic separator at Jiuquan Iron and Steel Co.[J].Iron and Steel,1988,23(6):5-11.
[10]任允芙,凤麟.酒钢含重晶石铁精矿在烧结过程中重晶石分解机理的研究[J].金属学报,1986,22(4):142-148.Ren Y F,Feng L.Mechanism of decomposition of barite in process of sintering Jiuquan barite-containing iron ore concentrate[J].Acta Metallurgica Sinica,1986,22(4):142-148.
[11]Zhang J L,Wang Z Y,Xing X D,et al.Effect of aluminum oxide on the compressive strength of pellets[J].International Journal of Minerals,Metallurgy,and Materials,2014,21(4):339-344.
[12]高强健,魏国,何奕波,等.MgO对球团矿抗压强度的影响[J].东北大学学报(自然科学版),2013,34(1):103-106.Gao Q J,Wei G,He Y B,et al.Effect of MgO on compressive strength of pellet[J].Journal of Northeastern University(Natural Science),2013,34(1):103-106.
[13]李圣辉,陈铁军,张一敏,等.含镁添加剂用于铁矿球团的试验研究[J].烧结球团,2011,36(1):33-37.Li S H,Chen T J,Zhang Y M,et al.Experimental study on application of Mg-bearing additives in iron ore pellet[J].Sintering&Pellets,2011,36(1):33-37.
[14]Shen F M,Gao Q J,Xin J,et al.Effect of magnesia on the compressive strength of pellets[J].International Journal of Minerals,Metallurgy,and Materials,2014,21(5):431-437.
[15]Semberg P,Rutqvist A,Andersson C,et al.Interactions between iron oxides and the additives quartzite,calcite and olivine in magnetite based pellets[J].ISIJ International,2011,51(2):173-180.
[16]陈许玲,刘树,甘敏,等.高钛球团焙烧行为及其强化技术[J].工程科学学报,2016,38(7):920-929.Chen X L,Liu S,Gan M,et al.Roasting behavior and enhancing technology of high-titanium pellets[J].Chinese Journal of Engineering,2016,38(7):920-929.
[17]曹龙,段东平,韩洪亮.高炉瓦斯灰含碳球团粘结剂研究[J].过程工程学报,2013,13(1):164-168.Cao L,Duan D P,Han H L.Study on roasting of carbon-containing pellets from blast furnace dust with different binders[J].The Chinese Journal of Process Engineering,2013,13(1):164-168.
[18]周明顺,王义栋,赵东明,等.高硫铁精矿配比对球团工艺参数及性能的影响[J].钢铁,2018,53(5):11-17.Zhou M S,Wang Y D,Zhao D M,et al.Effects of adding high-sulfur magnetite concentrate on pelletizing parameters and performance[J].Iron and Steel,2018,53(5):11-17.
[19]朱德庆,虎训,潘建,等.优化配矿强化西澳超细粒磁铁精矿球团焙烧研究[J].工程科学学报,2017,39(5):683-692.Zhu D Q,Hu X,Pan J,et al.Optimization of feed blends to enhance the roasting performance of pellets made from western Australian ultrafine magnetite concentrate[J].Chinese Journal of Engineering,2017,39(5):683-692.
[20]陈许玲,黄云松,范晓慧,等.钒钛磁铁矿球团氧化焙烧行为和固结特性[J].中南大学学报(自然科学版),2016,47(2):359-366.Chen X L,Huang Y S,Fan X H,et al.Oxidation roasting behavior and concretion properties of vanadium-titanium magnetite pellet[J].Journal of Central South University(Science and Technology),2016,47(2):359-366.
[21]陈耀明,李建.氧化球团矿中Fe2O3的结晶规律[J].中南大学学报(自然科学版),2007,38(1):70-73.Chen Y M,Li J.Crystal rule of Fe2O3 in oxidized pellet[J].Journal of Central South University(Science and Technology),2007,38(1):70-73.
[22]范建军,张文平,刘慈光,等.预热焙烧参数对超细粒度磁铁矿粉球团性能的影响[J].钢铁,2013,48(12):20-24.Fan J J,Zhang W P,Liu C G,et al.Effect of preheating and roasting parameters on pellet property of super-fine magnetite concentrate[J].Iron and Steel,2013,48(12):20-24.
[23]郑红霞,汪琦,潘喜峰.磁铁矿球团氧化机理的研究[J].烧结球团,2003,28(5):13-16.Zheng H X,Wang Q,Pan X F.Study on the oxidation mechanism of magnetite pellets[J].Sintering&Pellets,2003,28(5):13-16.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |