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提高全钒钛球团矿抗压强度技术研究与应用

胡鹏 蒋胜 谭阳杰 周密 向绍红

胡鹏, 蒋胜, 谭阳杰, 周密, 向绍红. 提高全钒钛球团矿抗压强度技术研究与应用[J]. 钢铁钒钛, 2022, 43(4): 107-113. doi: 10.7513/j.issn.1004-7638.2022.04.017
引用本文: 胡鹏, 蒋胜, 谭阳杰, 周密, 向绍红. 提高全钒钛球团矿抗压强度技术研究与应用[J]. 钢铁钒钛, 2022, 43(4): 107-113. doi: 10.7513/j.issn.1004-7638.2022.04.017
Hu Peng, Jiang Sheng, Tan Yangjie, Zhou Mi, Xiang Shaohong. Research and application of improving the compressive strength of full V-Ti pellets[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(4): 107-113. doi: 10.7513/j.issn.1004-7638.2022.04.017
Citation: Hu Peng, Jiang Sheng, Tan Yangjie, Zhou Mi, Xiang Shaohong. Research and application of improving the compressive strength of full V-Ti pellets[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(4): 107-113. doi: 10.7513/j.issn.1004-7638.2022.04.017

提高全钒钛球团矿抗压强度技术研究与应用

doi: 10.7513/j.issn.1004-7638.2022.04.017
详细信息
    作者简介:

    胡鹏(1988—),男,四川广元人,工程师,副研究员,研究方向:铁矿石造块及高炉炼铁,E-mail:hupeng526417@163.com

  • 中图分类号: TF046

Research and application of improving the compressive strength of full V-Ti pellets

  • 摘要: 针对全钒钛球团矿抗压强度低(平均1 600 N/个左右)、波动大(最低仅926 N/个,最高2 287 N/个),进入高炉冶炼后极大的影响了高炉稳定顺行,特开展了提高全钒钛球团矿抗压强度技术研究与应用。结果表明:通过增设润磨设备后,造球混合料粒度小于0.074 mm粒级由66.64%提高至71.69%,矿物颗粒表面变粗糙,粘结性增加,活性增强;且将预热二段温度提高到900 ℃左右、降低链篦机机速、延长预热时间,将焙烧温度从1150 ℃提高至1200 ℃以上,降低回转窑转速,延长焙烧时间后,球团矿内部带直径降低至3 mm以下,抗压强度提高至1 989 N/个,波动明显减小,为高炉稳定顺行提供了原料基础。
  • 图  1  润磨前后混合料颗粒形貌

    (a)润磨前; (b)润磨后

    Figure  1.  Particle morphology of mixture before and after wet grinding

    图  2  润磨时间对生球落下强度和抗压强度的影响

    Figure  2.  Effect of wet grinding time on wet knock and strength of green pellet

    图  3  预热温度和预热时间对球团氧化率的影响规律

    Figure  3.  Effect of preheating temperature and time on pellet oxidation rate

    图  4  预热温度和预热时间对球团抗压强度的影响规律

    Figure  4.  Effect of preheating temperature and time on pellet strength

    图  5  焙烧温度对球团抗压强度和FeO含量的影响规律

    Figure  5.  Effect of roasting temperature on strength and FeO content of pellet

    图  6  焙烧时间对球团抗压强度和FeO含量的影响规律

    Figure  6.  Effect of roasting time on strength and FeO content of pellet

    图  7  全钒钛球团宏观形貌

    Figure  7.  Macro-morphology of full V-Ti pellet

    图  8  全钒钛球团内部带和外部带的微观形貌

    a-内部带;b-外部带P—孔;S—硅酸盐相;L—钛铁矿;H—赤铁矿

    Figure  8.  Micro-morphology of the inner and outer band

    图  9  工业应用前后抗压强度变化情况

    Figure  9.  Changes of compressive strength of pellet before and after technology optimization

    表  1  钒钛磁铁矿样品的主要化学成分及烧损

    Table  1.   Main chemical composition and Ig of sample V-Ti magnetite %

    TFeFeOSiO2CaOV2O5TiO2MgOAl2O3Ig
    55.2229.464.150.800.7079.993.803.85−1.40
    注:Ig为烧损量。
    下载: 导出CSV

    表  2  钒钛磁铁矿样品的粒度组成

    Table  2.   Size distribution of sample V-Ti magnetite %

    >0.15 mm0.15~0.074 mm0.074~0.045 mm<0.045 mm<0.074 mm
    7.0328.2621.0643.6564.71
    下载: 导出CSV

    表  3  膨润土的主要化学成分

    Table  3.   Main chemical composition of bentonite %

    Fe2O3SiO2CaOAl2O3MgOK2ONa2OIg
    3.2255.004.8214.033.420.981.5214.69
    下载: 导出CSV

    表  4  膨润土的物理性能

    Table  4.   Physical properties of bentonite

    胶质价/
    %
    膨胀容/
    (mL·g−1)
    吸兰量(100 g计)/
    g
    pH值粒度<0.074 mm的
    矿物含量/%
    62.0042.0235.7010.4497.79
    下载: 导出CSV

    表  5  润磨时间对混合料粒度组成的影响

    Table  5.   Effect of wet grinding time on size distribution of mixture

    润磨时间/min粒度组成/%
    >0.15 mm0.15~0.075 mm0.074~0.045 mm<0.045 mm<0.074 mm
    07.0328.2621.0643.6564.71
    35.7223.3622.1648.7670.92
    44.9622.8321.7850.4372.21
    54.5022.2120.9652.3373.29
    64.1221.7219.9954.1774.16
    下载: 导出CSV

    表  6  不同焙烧温度的内部带直径

    Table  6.   Inner band diameter of pellet after roasting at different temperatures

    焙烧温度/℃内部带直径/mm
    11505~8
    11804~5
    12003~4
    12501~2
    12800~1
    下载: 导出CSV

    表  7  链篦机-回转窑热工制度优化情况

    Table  7.   Optimization of grate kiln thermal system

    项目链篦机机速
    /(m·min−1)
    预热一段
    /℃
    预热二段
    /℃
    回转窑转速
    /(r·min−1)
    窑头温度
    /℃
    窑中温度
    /℃
    窑尾温度
    /℃
    优化前2.3550~580820~8501.0950~9801150~1180730~760
    优化后1.95600~630890~9200.911070~11001220~1250770~800
    下载: 导出CSV
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  • 收稿日期:  2021-10-24
  • 刊出日期:  2022-09-14

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