Swelling behavior of hot preheated pellets in reduction roasting process

Swelling behavior of hot preheated pellets in reduction roasting process
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热预热球团矿还原焙烧过程中的膨胀行为

DOI:
10.1007/s11771-016-3342-3
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发表时间:
2016-12
影响因子:
4.4
通讯作者:
Jiang Tao
Jiang Tao
中科院分区:
材料科学3区
文献类型:
--
作者:
Han Gui-hong;Zhang Duo;Huang Yan-fang;Jiang Tao

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煤基直接还原工艺是一种简单易行的煤基直接还原工艺。在等温条件下,用照相技术研究了还原参数对预热球团膨胀指数的影响。实验结果表明,随着还原时间的延长,球团矿的膨胀指数先增大后减小,温度从900 °C到1100 °C,球团矿的膨胀指数从175%明显减小到30%。XRD和SEM分析结果表明,球团矿的膨胀行为是由新形成的金属铁颗粒的结构决定的。纤维状铁颗粒的形成和长大促进了体积的增加.低温和低CO含量有利于一步法金属铁晶粒的形成和定向生长。
One kind of facile coal-based direct reduction process is using hot preheated pellets for reduction in grate kiln. In this work, effects of reduction parameters on swelling index of hot preheated pellets were investigated by photographic technique under isothermal conditions. Experimental results show that swelling index of pellets is firstly increased then gradually decreased with increasing reduction time, while that is found to be an obvious decrease from 175 % to 30% with the variation of temperature from 900 °C to 1100 °C. Results of XRD combined with SEM reveal that swelling behavior of pellets is decided by structure of newly formed metal iron grains. The formation and growth of fibers iron grains promote the increase in volume. Low temperature and low CO content are favored to the formation and orientated growth of metal iron grains in the one step process.
DOI: 10.1007/bf02657290
发表时间: 1984-12
期刊: Metallurgical Transactions B
影响因子: --
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