Proper MgO/Al2O3 Ratio in Blast-Furnace Slag: Analysis of Proper MgO/Al2O3 Ratio Based on Observed Data

Proper MgO/Al2O3 Ratio in Blast-Furnace Slag: Analysis of Proper MgO/Al2O3 Ratio Based on Observed Data
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高炉渣中合适的 MgO/Al2O3 比例:基于观测数据的合适 MgO/Al2O3 比例分析

DOI:
10.3390/met10060784
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发表时间:
2020-06
期刊:
影响因子:
2.9
通讯作者:
Fang Long
Fang Long
中科院分区:
材料科学3区
文献类型:
--
作者:
Fengman Shen;Xinguang Hu;Haiyan Zheng;Xin Jiang;Qiangjian Gao;Hongsong Han;Fang Long

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随着优质铁矿石资源的逐渐枯竭,炼铁高炉已逐步转向使用高含量的Al_2O_3铁矿石。在此条件下,采用在炉渣中添加氧化镁的方法,以缓解氧化铝含量过高带来的操作问题。然而,对于高炉渣体系(Al_2O_3=8-25%),其合适的镁铝比并没有进行系统的研究。本文根据不同Al_2O_3含量下的高炉渣系,探讨了适宜的镁铝比。根据热力学和相图分析,得出如下结论:(1)当渣中Al_2O_3<14%时,MgO/Al_2O_3比值不受限制;(2)当渣中Al_2O_3含量为15~17%时,其比值应在0.40~0.50之间;(3)当渣中Al_2O_3含量大于18%时,其比值应为0.45~0.55。已在各行业确定了合适的镁铝比取值,取得了显著的经济效益和社会效益。
With the gradual depletion of high-quality iron-ore resources, ironmaking blast furnaces have gradually shifted to using high-content Al2O3 iron ore. Under this condition, the addition of MgO in the slag is adopted to alleviate operation problems caused by the high content of Al2O3. However, the proper value of the MgO/Al2O3 ratio for blast-furnace slag systems (Al2O3 = 8–25%) is not systematically studied. In this paper, we discuss the proper MgO/Al2O3 ratio on the basis of blast-furnace slag systems under different Al2O3 contents. On the basis of thermodynamics and phase-diagram analysis, it could be concluded that: (1) the MgO/Al2O3 ratio is not limited when Al2O3 in slag is less than 14%, (2) the MgO/Al2O3 ratio is required to be in the range of 0.40–0.50 when Al2O3 in the slag is 15–17%, and (3) the MgO/Al2O3 ratio should be 0.45–0.55 when Al2O3 in the slag is larger than 18%. The proper MgO/Al2O3 ratio value has been established in various industries, and it has achieved significant economic and social benefits.
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