配加粉尘对铁精矿生球爆裂温度的影响规律
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摘要
针对弓长岭球团厂配加粉尘的生球爆裂温度低的问题,分析了粉尘的物化性能,研究了配加粉尘对铁精矿生球爆裂温度的影响。结果表明:配加质量分数4%的粉尘可提高生球的落下强度和抗压强度,但生球的爆裂温度下降;当磁铁矿和赤铁矿水分超过9.50%时,所造生球爆裂温度<500℃。分析粉尘对影响生球爆裂温度的机理可知:粉尘具有的较细粒度、较强亲水性、较高比表面积和不合理粒度组成等特点,是导致生球爆裂温度<500℃的主要原因。结合现场实际,建议通过将磁铁矿和赤铁矿水分调整为9%后再参与配料,是保证生球爆裂温度超过500℃的有效措施之一。
In view of problem of low decrepitation temperature of green balls proportioned with dust in Gongchangling pelletizing plant, the physic-chemical properties of the dust are analyzed,and the influence of dust addition on decrepitation temperature of iron ore concentrate green balls are studied.The results show that,with addition of 4% mass fraction dust,the drop strength and compressive strength of green balls can be increased,but the decrepitation temperature of the green balls lowers.When the moisture content of magnetite and hematite exceeds 9.50%,the decrepitation temperature of the green balls is <500 ℃.It is known from the analysis of mechanism of dust influence on the decrepitation temperature of the green balls that some characteristics of the dust such as fine particle size,strong hydrophilicity,high specific surface area and irrational particle size composition are the main factors to cause the decrepitation temperature of the green balls <500 ℃.In combination with actual site condition,it is suggested that the moisture content of magnetite and hematite should be adjusted to 9% for proportioning is one of the effective measures to guarantee the decrepitation temperature of green balls to exceed 500 ℃.
In view of problem of low decrepitation temperature of green balls proportioned with dust in Gongchangling pelletizing plant, the physic-chemical properties of the dust are analyzed,and the influence of dust addition on decrepitation temperature of iron ore concentrate green balls are studied.The results show that,with addition of 4% mass fraction dust,the drop strength and compressive strength of green balls can be increased,but the decrepitation temperature of the green balls lowers.When the moisture content of magnetite and hematite exceeds 9.50%,the decrepitation temperature of the green balls is <500 ℃.It is known from the analysis of mechanism of dust influence on the decrepitation temperature of the green balls that some characteristics of the dust such as fine particle size,strong hydrophilicity,high specific surface area and irrational particle size composition are the main factors to cause the decrepitation temperature of the green balls <500 ℃.In combination with actual site condition,it is suggested that the moisture content of magnetite and hematite should be adjusted to 9% for proportioning is one of the effective measures to guarantee the decrepitation temperature of green balls to exceed 500 ℃.
引文
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[2] 徐匡迪.低碳经济与钢铁工业[J].钢铁,2010,45(3):1-12.
[3] 黄柱成,邱冠周.铁矿造块研究方法[M].长沙:中南大学出版社,2015.
[4] 姜涛.烧结球团生产技术手册[M].北京:冶金工业出版社,2014.
[5] 杨雪峰,姜涛,范晓慧,等.昆钢球团回转窑结圈机理研究及预防控制[J].烧结球团,2009,34(3):21-24.
[6] 阳诚平.程潮铁矿球团控制回转窑结圈的实践[J].烧结球团,2008,33(5):37-40.
[7] 李军,张化明.邯钢氧化球团回转窑结圈原因分析及预防[J].烧结球团,2007,32(3):55-58.
[8] 钟强,杨永斌,蒙飞宇,等.铁矿球团用膨润土的流变特性[J].中南大学学报(自然科学版),2016,47(9):2907.
[9] 王昌安,罗廉明.铁精矿粒度组成对球团质量的影响[J].武汉化工学院学报,2005,27(2):38.
[10] 潘建,田宏宇,朱德庆,等.超微细铁精矿的粒度特性和润湿性对其成球性能的交互影响[J].过程科学学报,2017,39(6):830.
[11] 朱德庆,周冰致,王召元,等.西澳超细粒磁铁精矿特性及其对焙烧性能的影响[J].烧结球团,2016,41(6):38.