15～5mm酒钢镜铁矿石回转窑焙烧结圈可能性研究
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摘要
为了开发利用酒钢镜铁山-15 mm的粉状镜铁矿石,在完成对试样和还原煤化学成分、软熔性能分析的基础上,对回转窑磁化焙烧工艺窑壁结圈可能性进行了研究。结果表明:试验原料及各阶段产物的软化温度均在1 100℃以上,当回转窑内温度严格控制在镜铁矿适宜的还原温度850~900℃时,回转窑内物料不会发生软熔和液化;15~5 mm的小块矿采用直径为(0.45~0.65)m×9 m燃气变径回转窑处理,在哈密烟煤用量为2%、焙烧温度为850~900℃、窑内停留时间为2.5 h、填充率为10%、焙烧产物水淬冷却后磨矿细度为-0.074 mm占80%、弱磁选磁场强度为100 k A/m的情况下,可得到铁品位为55.00%、回收率为83.00%的铁精矿,且回转窑内壁360 h未见结圈现象;科学合理的窑型、稳定合理的热制度、适宜的入窑粒度,对减少酒钢镜铁山镜铁矿石回转窑磁化焙烧结圈现象的产生十分有效。
In order to exploit and utilize the powdery specularite at- 15 mm in Jingtie Mountain of Jiusteel,the ringing possibility during magnetizing and roasting process in rotary kiln was studied based on the analysis of chemical component and softening melting performance of the ore and the reducing coal. The results showed that when the reduction temperature was strictly controlled at range of 850 ℃ to 900 ℃,the softening phenomenon of the ore did not happen,since the softening and melting temperature of the ore and the stage products is at 1 100 ℃ or above. The ore particles ranging from 15 mm to 5 mm are roasted by gas variable diameter kiln with the size from 0. 45 m × 9 m to 0. 65 m × 9 m. Under the condition of carbon powder content of 2. 0%,roasting temperature at 850 ~ 900 ℃ for 2. 5 h,charge ratio at 10%,grinding fineness of 80%- 0. 074 mm and low intensity magnetic separation field intensity of 100 k A / m,iron concentrate with iron grade of 55% and the recovery of 83% was received,and the ringing phenomenon did not appear in 360 h. Scientific and rational kiln type,stable and reasonable thermal system,and appropriate particle size,can effectively reduce the ringing formation during magnetizing and roasting process of specularite in the rotary kiln in Jingtie Mountain,Jiusteel.
In order to exploit and utilize the powdery specularite at- 15 mm in Jingtie Mountain of Jiusteel,the ringing possibility during magnetizing and roasting process in rotary kiln was studied based on the analysis of chemical component and softening melting performance of the ore and the reducing coal. The results showed that when the reduction temperature was strictly controlled at range of 850 ℃ to 900 ℃,the softening phenomenon of the ore did not happen,since the softening and melting temperature of the ore and the stage products is at 1 100 ℃ or above. The ore particles ranging from 15 mm to 5 mm are roasted by gas variable diameter kiln with the size from 0. 45 m × 9 m to 0. 65 m × 9 m. Under the condition of carbon powder content of 2. 0%,roasting temperature at 850 ~ 900 ℃ for 2. 5 h,charge ratio at 10%,grinding fineness of 80%- 0. 074 mm and low intensity magnetic separation field intensity of 100 k A / m,iron concentrate with iron grade of 55% and the recovery of 83% was received,and the ringing phenomenon did not appear in 360 h. Scientific and rational kiln type,stable and reasonable thermal system,and appropriate particle size,can effectively reduce the ringing formation during magnetizing and roasting process of specularite in the rotary kiln in Jingtie Mountain,Jiusteel.
引文
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[12]傅菊英,姜涛,朱德庆.烧结球团学[M].长沙:中南工业大学出版社,1996.Fu Juying,Jiang Tao,Zhu Deqing.Sintering and Pelletizing[M].Changsha:Central South University Press,1996.
[2]谢承祥,李厚民,王瑞江,等.中国已查明的铁矿资源的结构特征[J].地质通报,2009,28(1):80-84.Xie Chengxiang,Li Houmin,Wang Ruijiang,et al.Structural characteristics of iron ore resources identified to date in China[J].Geological Bulletin of China,2009,28(1):80-84.
[3]丁春江,陈铁军,胡佩伟,等.镜铁山5~15 mm粒级镜铁矿石磁化焙烧—弱磁选试验[J].金属矿山,2014(3):71-74.Ding Chunjiang,Cheng Tiejun,Hu Peiwei,et al.Magnetic roasting and low intensity magnetic separation experiment of specularite particles at 5~15 mm from Jingtie Mountain[J].Metal Mine,2014(3):71-74.
[4]余永富,余侃萍,翁孝卿.我国难选铁矿石选矿技术进展[J].金属矿山,2011(9):1-4.Yu Yongfu,Yu Kanping,Weng Xiaoqing.The beneficiation technical progress of refractory iron ore in China[J].Metal Mine,2011(9):1-4.
[5]谢兴中,王毓华.褐铁矿选矿研究现状与思考[J].金属矿山,2010(1):6-10.Xie Xingzhong,Wang Yuhua.Current situation and thinking of mineral processing technique on limonite ore[J].Metal Mine,2010(1):6-10.
[6]张茂,王东,陈启平,等.云南某褐铁矿磁化焙烧—磁选工艺试验研究[J].矿冶工程,2011,31(6):51-53.Zhang Mao,Wang Dong,Chen Qiping,et al.Experimental study on magnetizing roasting-magnetic separating of limonite from Yunnan[J].Mining and Metallurgical Engineering,2011,31(6):51-53.
[7]叶匡吾.回转窑结圈的防止和消除[J].烧结球团,1998(6):32-34.Ye Kuangwu.Prevention and elimination of ring formation[J].Sintering and Pelletizing,1998(6):32-34.
[8]马勇.钛精矿回转窑直接还原过程结圈可能性的探讨[J].湖南冶金,2003,31(1):21-24.Ma Yong.Study on ringing possibility in a process of titanium concentrate direct reduction with rotary kiln[J].Hunan Metallurgy,2003,31(1):21-24.
[9]张汉泉.链篦机-回转窑氧化球团结圈结块原因及预防[J].金属矿山,2005(7):59-61.Zhang Hanquan.Causes for ringing and lumping of grate-kiln for oxidized pellets and precautions[J].Metal Mine,2005(7):59-61.
[10]江吉惠,洪灶熬.煤灰熔融性国家标准测定方法的探讨[J].烧结球团,2005,30(5):14-16.Jiang Jihui,Hong Zaoao.Discussion on GB/T219—1996 Standard[J].Sintering and Pelletizing,2005,30(5):14-16.
[11]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.Yang Xuefeng,Jiang Tao,Fan Xiaohui,et al.Mechanism study and countermeasures on ring formation of rotary kiln used to produce oxidized pellets in KISC[J].Sintering and Pelletizing,2009,34(3):21-24.
[12]傅菊英,姜涛,朱德庆.烧结球团学[M].长沙:中南工业大学出版社,1996.Fu Juying,Jiang Tao,Zhu Deqing.Sintering and Pelletizing[M].Changsha:Central South University Press,1996.