除尘灰润磨预处理对其所制球团质量的影响
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摘要
除尘灰因经过高温处理,具有孔隙发达、表面粗糙、疏水性强等特点,使得采用常规方法造球时,球团性能指标低。为提高球团性能,采用润磨工艺对除尘灰进行预处理。结果表明,当润磨时间为9 min时,与未进行润磨处理比较,生球落下强度和抗压强度分别从9.2次、20.09 N/个提高到30.5次、30.78 N/个,干球落下强度和抗压强度分别从0.7次、52.44 N/个提高至2.1次、86.42N/个,群落粉化率从18.42%降低至5.23%。润磨后的除尘灰微细颗粒含量增加,比表面积增大,造球时母球发生兼并聚集的可能性降低,母球更趋向于吸收微细粒粉料而逐渐长大,所制球团质量高。
Due to the high temperature treatment,fly ash has the characteristics of multipore,rough surface,high hydrophobic etc.and because of which the pellets has poor properties by conventional methods of pelletization.In order to improve the properties of pellets,damp milling methods is applied for the pretreatment of fly ash.The results indicated that,compared with non damp milling operations,while damp milling for 9 min,drop strength and comprehensive strength of green pellets increased from 9.2 times,20.09 N /P to 30.5 times,30.78 N /P,drop strength and comprehensive strength of dry pellets increased from 0.7 times,52.44 N /P to 2.1 times,86.42 N /P,pulverization rate decreased from 18.42% to 5.23%.After damp milling,there are more microfine particles and larger specific surface in fly ash,which decrease the mergers and acquisitions possibility of mother balls.The mother balls tend to absorb the microgranular powder and gradually grown up,making the pellets possess high quality.
Due to the high temperature treatment,fly ash has the characteristics of multipore,rough surface,high hydrophobic etc.and because of which the pellets has poor properties by conventional methods of pelletization.In order to improve the properties of pellets,damp milling methods is applied for the pretreatment of fly ash.The results indicated that,compared with non damp milling operations,while damp milling for 9 min,drop strength and comprehensive strength of green pellets increased from 9.2 times,20.09 N /P to 30.5 times,30.78 N /P,drop strength and comprehensive strength of dry pellets increased from 0.7 times,52.44 N /P to 2.1 times,86.42 N /P,pulverization rate decreased from 18.42% to 5.23%.After damp milling,there are more microfine particles and larger specific surface in fly ash,which decrease the mergers and acquisitions possibility of mother balls.The mother balls tend to absorb the microgranular powder and gradually grown up,making the pellets possess high quality.
引文
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[2]吴斌,刘合萍.以含锌尘泥为原料的含碳球团强度及金属化率的影响因素[J].云南冶金,2007,36(4):23-25.Wu Bin,Liu Heping.The factors influencing the strength and metallization rate of carbon-bearing pellets made of zinc-bearing dust and sludge as raw materials[J].Yunnan Metallurgy,2007,36(4):23-25.
[3]黄柱成,李铁辉,易凌云,等.某钢铁厂除尘灰强化造球试验研究[J].金属矿山,2013(4):164-168.Huang Zhucheng,Li Tiehui,Yi Lingyun,et al.Enhancing pelletizing tests of steel plant dust[J].Metal Mine,2013(4):164-168.
[4]王玮,孟令和.除尘灰综合利用技术的开发与应用[J].中国资源综合利用,2011,29(2):23-26.Wang Wei,Meng Linghe.The development and utilize of dust comprehensive utilization technology[J].China Resources Comprehensive Utilization,2011,29(2):23-26.
[5]王全利.含铁尘泥的综合利用[J].包钢科技,2002,28(6):75-77.Wang Quanli.Comprehensive utilization of iron-bearing dust[J].Science&Technology of Baotou Steel(Group)Corporation,2002,28(6):75-77.
[6]许斌,庄剑鸣,刘国庆,等.硫酸烧渣利用途径的研究[J].矿产综合利用,1988(4):44-48.Xu Bin,Zhuang Jianming,Liu Guoqing,et al.The research of the way to sulfuric acid slag utilization[J].Multipurpose Utilization of Mineral Resources,1988(4):44-48.
[7]张一敏,陈铁军.全硫酸渣生产氧化球团试验研究及工业应用[J].钢铁研究,2005,33(1):1-4.Zhang Yimin,Chen Tiejun.Experiments of acid pellet using treated pyrite slag and its commercial application[J].Research on Iron and Steel,2005,33(1):1-4.
[8]解珍健,节永烈,王富生.润磨工艺在马钢球团生产中的应用[J].安徽冶金科技职业学院学报,2007,17(1):44-48.Xie Zhenjian,Jie Yonglie,Wang Fusheng.Application of humidifying grinding process in pelletizing of Maanshan iron&steel[J].Journal of Anhui Vocational College of Metallurgy and Technology,2007,17(1):44-48.
[9]朱满平,夏玉林,康英杰.润磨机在球团生产工艺中的应用[J].重型机械科技,2005(3):44-45.Zhu Manping,Xia Yulin,Kang Yingjie.The application of the damp mill in the pelletizing technique[J].Heavy Machinery Science and Technology,2005(3):44-45.
[10]么大锁,程相文.润磨机最佳工作转速率的研究[J].起重运输机械,2008(9):87-89.Me Dasuo,Cheng Xiangwen.Study of optimum rotation speed of damp mill[J].Hoisting and Conveying Machinery,2008(9):87-89.
[11]朱德庆,熊守安,王昌安,等.大冶铁矿竖炉球团润磨工艺的研究[J].烧结球团,2002,27(4):15-18.Zhu Deqing,Xiong Shouan,Wang Chang'an,et al.Damp milling for improving the stabilization of disc pelletizer and strength of green pellet[J].Sintering and Pelletizing,2002,27(4):15-18.
[12]黄柱成,李骞,杨永斌,等.混合料润磨预处理对氧化球团矿质量的影响[J].中南大学学报:自然科学版,2004,35(5):753-758.Huang Zhucheng,Li Qian,Yang Yongbin,et al.Effect of wet-grinding of mix on quality of iron ore concentrate pellet[J].Journal of Central South University:Science Edition,2004,35(5):753-758.
[13]艾德生,李庆丰,戴遐明,等.用透过高度法测定粉体的润湿接触角[J].理化检验:物理分册,2001,37(3):110-112.Ai Deisheng,Li Qingfeng,Dai Xiaming,et al.Measurement of wetting contact angle of powder by permeating height method[J].Physical Testing and Chemical Analysis:Physical Testing Part,2001,37(3):110-112.
[14]白国华,周晓青,范晓慧,等.润磨强化硫酸渣制备氧化球团的技术及机理[J].中南大学学报:自然科学版,2011,42(6):1509-1515.Bai Guohua,Zhou Xiaoqing,Fan Xiaohui,et al.Enhancing technology and mechanism of oxidized pellet prepared from pyrite cinder by moisture grinding[J].Journal of Central South University:Science Edition,2011,42(6):1509-1515.
[15]朱德庆,傅守橙,蔡汝卓,等.含粘结剂的磁铁矿生球强度机理研究[J].烧结球团,1996,21(1)55-60.Zhu Deqing,Fu Shoucheng,Cai Ruzhuo,et al.The research to green ball strength of magnetite with binder[J].Sintering and Pelletizing,1996,21(1):55-60.
[16]朱德庆,姜涛,邱冠周,等.圆盘造球机中的强制分级机理及其应用[J].中南工业大学学报,1999,30(2):137-140.Zhu Deqing,Jiang Tao,Qiu Guanzhou,et al.The principle of forced classification on disc balling machine and its usage[J].Journal of Central South University of Technology,1999,30(2):137-140.
[17]任俊,沈健,卢寿慈.颗粒分散科学与技术[M].化学工业出版社,2005.Ren Jun,Shen Jian,Lu Shouci.Particle dispersion science and technology[M].Chemistry Industry Press,2005.