高钙赤铁矿烧结的矿物特性、冶金性能及相结构演变

牛乐乐; 刘征建; 张建良; 兰大伟; 李思达; 李震; 王耀祖

doi:10.1007/s12613-022-2484-6

Volume 30 Issue 2

Feb. 2023

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文章导航 > 矿物冶金与材料学报（英文） > 2023 > 30(2): 303-313

Lele Niu, Zhengjian Liu, Jianliang Zhang, Dawei Lan, Sida Li, Zhen Li, and Yaozu Wang, Mineralogical characteristics, metallurgical properties and phase structure evolution of Ca-rich hematite sintering, Int. J. Miner. Metall. Mater., 30(2023), No. 2, pp. 303-313. https://doi.org/10.1007/s12613-022-2484-6

Cite this article as:

Lele Niu, Zhengjian Liu, Jianliang Zhang, Dawei Lan, Sida Li, Zhen Li, and Yaozu Wang, Mineralogical characteristics, metallurgical properties and phase structure evolution of Ca-rich hematite sintering, Int. J. Miner. Metall. Mater., 30(2023), No. 2, pp. 303-313. https://doi.org/10.1007/s12613-022-2484-6

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研究论文

高钙赤铁矿烧结的矿物特性、冶金性能及相结构演变

1)
北京科技大学冶金与生态工程学院, 北京 100083, 中国
2)
昆士兰大学化学工程学院, 布里斯班4072, 澳大利亚
3)
北京科技大学人工智能研究院, 北京 100083, 中国
4)
秦皇岛秦冶重工有限公司, 秦皇岛 066000, 中国

通讯作者:
王耀祖 E-mail: wgyozu@163.com

文章亮点

(1) 全面地研究了高钙型赤铁矿的矿物学特性。

(2) 研究并分析了高钙赤铁矿与国产磁铁精粉混合烧结行为及其在烧结过程的作用机理。

(3) 基于烧结指标和烧结矿冶金性能的综合表现计算并分析了不同高钙赤铁矿配比的优劣。

中文摘要

为了研究高钙赤铁矿的烧结特性，采用了化学分析、激光衍射、扫描电镜、X射线衍射和微型烧结等方法和手段分析了其矿物学特性，并设计烧结杯试验探究其与国产磁铁精粉的混合烧结行为，最后采用灰色关联数学模型计算和比较了不同高钙赤铁矿含量下的综合烧结性能。结果表明，高钙赤铁矿粒度较粗，所含Ca元素以方解石（CaCO₃）的形式存在，具有较强的自熔特性且自熔产生的液相结晶形态较好。在烧结过程中添加20wt%的含量后，能够提高利用系数、减少固体燃料消耗、提高烧结矿还原性指数和改善高炉的透气性指数的幅度分别为0.45 t/(m²·h)、6.11 kg/t、6.17%和65.39 kPa·°C。与全磁铁精粉烧结过程相比，高钙赤铁矿烧结还可以提高烧结烟气的热值，有利于烟气回收热量并进行二次利用。随着高钙赤铁矿含量的增加，烧结混合料在成矿过程中的聚合方式由以液相粘结为主转变为局部液相粘结伴随着铁氧化物连晶的共同作用。根据灰色关系模型的计算，在0–20wt%的配比范围内，高钙赤铁矿含量增加对烧结经济技术指标与烧结矿冶金性能综合表现的提升是有利的。

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Research Article

Mineralogical characteristics, metallurgical properties and phase structure evolution of Ca-rich hematite sintering

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Abstract

Abstract

In order to study the sintering characteristics of Ca-rich iron ore, chemical analysis, laser diffraction, scanning electron microscopy, XRD-Rietveld method, and micro-sintering were used to analyze the mineralogical properties and sintering pot tests were used to study the sintering behavior. In addition, a grey correlation mathematical model was used to calculate and compare the comprehensive sintering performance under different calcium-rich iron ore contents. The results demonstrate that the Ca-rich iron ore has coarse grain size and strong self-fusing characteristics with Ca element in the form of calcite (CaCO₃) and the liquid phase produced by the self-fusing of the calcium-rich iron ore is well crystallized. Its application with a 20wt% content in sintering improves sinter productivity, reduces fuel consumption, enhances reduction index, and improves gas permeability in blast furnace by 0.45 t/(m²·h), 6.11 kg/t, 6.17%, and 65.39 kPa·°C, respectively. The Ca-rich iron ore sintering can improve the calorific value of sintering flue gas compared with magnetite sintering, which is conducive to recovering heat for secondary use. As the content of the Ca-rich iron ore increases, sinter agglomeration shifts from localized liquid-phase bonding to a combination of localized liquid-phase bonding and iron oxide crystal connection. Based on an examination of the greater weight value of productivity with grey correlation analysis, the Ca-rich iron ore is beneficial for the comprehensive index of sintering in the range of 0–20wt% content. Therefore, it may be used in sintering with magnetite concentrates as the major ore species.
- calcium-rich iron ore;
- mineralogical properties;
- phase structure evolution;
- flue gas heat;
- grey relation analysis

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References

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