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Insight into effect of CaCO3 on reduction roasting of fine-grained silicate type iron oxide ore and its application on Fe separation and recovery

文献类型： 外文期刊

作者： Wu, Fangfang 1 ; Deng, Jie 1 ; Mi, Baobin 2 ; Xiao, Zhu 1 ; Kuang, Jiaqi 1 ; Liu, Hui 1 ; Liang, Min 1 ; Liu, Biqiong 3 ; Yu 1 ;

作者机构： 1.Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China

2.Hunan Acad Agr Sci, Res Inst Vegetables, Changsha 410125, Hunan, Peoples R China

3.Hunan Agr Univ, Grad Sch, Changsha 410128, Hunan, Peoples R China

关键词： Fined-grained iron ore; CaCO3; Alkali lignin; Microwave; Silicate gangue removal

期刊名称：POWDER TECHNOLOGY （ 影响因子：5.134； 五年影响因子：4.801 ）

ISSN： 0032-5910

年卷期： 2019 年 356 卷

页码：

收录情况： SCI

摘要： To solve the problem of processing of refractory iron oxide ore resulted from its fine-grained disseminated structure, in this paper, an improved technology was innovatively proposed, which consisted of three stages of reduction roasting-acid leaching followed by magnetic separation, and CaCO3 was introduced during roasting process. Mechanism analyses indicated that kaolinite, a major gangue in ore, can be thermally dehydrated to amorphous metakaolin during roasting process, and CaCO3 can in part react with metakaolin-converting the stable kaolinite gangue mineral into acid-soluble Ca3Al2(SiO4)(3), and subsequently Ca3Al2(SiO4)(3) was selectively removed by acid leaching process. Moreover, the presence of CaCO3 can also improve the gathering state of Fe-rich particles, which is beneficial for magnetic separation. Iron concentrate obtained via the proposed technology contained 53.73% Fe, 9.02% Mn, 7.51% Al, and 2.46% Si, with a Fe recovery ratio of 88.20%, which surely meet the iron ore quality requirement of steel and iron industry. (C) 2019 Published by Elsevier B.V.

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