碱度对生球质量和球团矿抗压强度的影响
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摘要
通过改变A矿粉和B矿粉的配比来研究碱度对生球质量和球团矿抗压强度的影响。研究发现:随着碱度的提高,生球的落下强度、抗压强度逐渐降低,热爆裂温度逐渐升高;随着碱度提高,在焙烧过程中赤铁矿晶粒不断发育长大,但球团矿中产生的低熔点硅酸盐矿物增多并相互聚集在一起,恶化了赤铁矿晶粒间的连晶程度,同时增加了球团矿中的孔隙,导致球团的抗压强度逐渐降低。
In this paper the impact of basicity on the green ball quality and cruslring strength of pellets had been investigated by changing the ratio of A fine powder and B mineral powder. When the basicity is increased, the incidence strength and the compression strength of the green ball gradually decrease, but thermal explosion temperature increases. At the same time hematite crystal grains develops and grows up continuously in the process of roasting,however, the low melting point silicate minerals producing in the pellets increases in volume and aggregate together, which will worsen the connection degree of hematite crystal, at the same time, the ratio of pore in pellets increases, causing the decrease in compressive strength of pelletsgradually.
In this paper the impact of basicity on the green ball quality and cruslring strength of pellets had been investigated by changing the ratio of A fine powder and B mineral powder. When the basicity is increased, the incidence strength and the compression strength of the green ball gradually decrease, but thermal explosion temperature increases. At the same time hematite crystal grains develops and grows up continuously in the process of roasting,however, the low melting point silicate minerals producing in the pellets increases in volume and aggregate together, which will worsen the connection degree of hematite crystal, at the same time, the ratio of pore in pellets increases, causing the decrease in compressive strength of pelletsgradually.
引文
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[5] Jiang Dajun, Lin Qiangu, He Muguang, et al. Experimention on effects of pellet property in different basicity and ore matching structure [J]. Sichuan Metallurgy,2009,31(5):7-12.(蒋大军,林千谷,何木光,等.不同碱度与配矿结构对球团矿性能的影响[J].四川冶金,2009,31(5):7-12.)
[6] Gao Donghui, Wang Yongbin, Luo Guoping,et al. Tudy of crystal stock resistance and comparison of sphericity between the self-produced and Barun ore concentrate powder[J]. Inner Mongolia University of Science and Technology,2010,29(2):99-102.(高东辉,王永斌,罗果萍,等.包钢自产和巴润精矿粉的成球性对比和连晶性研究[J].内蒙古科技大学学报,2010,29(2):99-102.)
[7] Long Yue, Xu Chenguang, Zhang Yanhui, et al. Effect of MgO content on the strength of high magnesium alkaline pellets [J].Iron Steel Vanadium Titanium ,2016,37(4):99-104.(龙跃,徐晨光,张彦辉,等. MgO对高镁碱性球团矿强度的影响[J].钢铁钒钛,2016,37(4):99-104.)
[2] Yang Xiaodong, Zhang Dingchen, Liu Kun,et al. Pellets instead of sintering-The important ways of saving energy and low carbon pollution before the iron [J].Journal of Engineering Studies, 2017,9(1):44-52. (杨晓东,张丁辰,刘锟,等.球团替代烧结——铁前节能低碳污染减排的重要途径[J].工程研究——跨学科视野中的工程,2017,9(1):44-52.)
[3] Li Yingkui. Influence of roasting progress condition on pellet reduicbility[J]. Hebei Metallurg,2017(1):11-14.(李英魁.焙烧工艺对球团矿还原性能的影响[J].河北冶金,2017(1):11-14.)
[4] Wu Zhijie.Study on iron material rationally and different basicity inpellets of Baotou steel[D].Baotou:Inner Mongolia University of Science and Technology ,2012. (武志杰.包钢球团矿铁料的合理配置及变碱度的试验研究[D].包头:内蒙古科技大学,2012.)
[5] Jiang Dajun, Lin Qiangu, He Muguang, et al. Experimention on effects of pellet property in different basicity and ore matching structure [J]. Sichuan Metallurgy,2009,31(5):7-12.(蒋大军,林千谷,何木光,等.不同碱度与配矿结构对球团矿性能的影响[J].四川冶金,2009,31(5):7-12.)
[6] Gao Donghui, Wang Yongbin, Luo Guoping,et al. Tudy of crystal stock resistance and comparison of sphericity between the self-produced and Barun ore concentrate powder[J]. Inner Mongolia University of Science and Technology,2010,29(2):99-102.(高东辉,王永斌,罗果萍,等.包钢自产和巴润精矿粉的成球性对比和连晶性研究[J].内蒙古科技大学学报,2010,29(2):99-102.)
[7] Long Yue, Xu Chenguang, Zhang Yanhui, et al. Effect of MgO content on the strength of high magnesium alkaline pellets [J].Iron Steel Vanadium Titanium ,2016,37(4):99-104.(龙跃,徐晨光,张彦辉,等. MgO对高镁碱性球团矿强度的影响[J].钢铁钒钛,2016,37(4):99-104.)