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An innovative technology for utilization of oolitic hematite via microwave fluidization pretreatment: Separation characteristics and mechanism

微波流态化预处理鲕状赤铁矿的创新技术:分离特性和机理

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Abstract

Oolitic hematite possesses the characteristics of large resource reserves, low iron grade, fine embedded particle size and complex mineral composition, which is difficult to be used efficiently through traditional beneficiation process. In this work, a new technology of microwave fluidization pretreatment (MFP) was proposed to strengthen the separation of oolitic hematite. Scanning electron microscope, vibrating sample magnetometer and laser particle size analyzer were used to explore the influence of MFP on roasting magnetic separation and leaching. The results presented that compared with conventional electric furnace pretreatment, the magnetism of roasting products has been significantly improved. The iron grade was increased from 56.88% to 58.72% and recovery was increased from 88.89% to 89.32% for magnetic separation concentrate. Phosphorus content of leaching residue was reduced from 0.17% to 0.11%, and phosphorus leaching rate was increased from 83.06% to 89.77% by MFP. MFP could strengthen microcrack formation and growth, increasing the specific surface area and the grindability of ore.

摘要

鲕状赤铁矿具有资源储量大、铁品位低、嵌布粒度细、矿物成分复杂等特点, 传统选矿工艺难 以有效利用。本文提出了一种新的微波流态化预处理工艺(MFP)来强化鲕状赤铁矿的分离。采用扫描 电子显微镜、振动样品磁强计和激光粒度分析仪研究了MFP对焙烧磁选和浸出的影响。结果表明, 与 常规电炉预处理(EFP)相比, MFP 焙烧产物的磁性显著提高, 其磁选精矿的铁品位从56.88%提高到 58.72%;回收率从88.89%提高到89.32%, 浸出渣的磷含量从0.17%降至0.11%, MFP 使磷浸出率从 83.06%提高到89.77%。MFP可以强化微裂纹的形成和生长, 从而增加矿石的比表面积和可磨性。

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Authors and Affiliations

  1. College of Chemical and Biological Engineering, Shandong University of Science and Technology, Qingdao, 266590, China

    Wen-tao Zhou  (周文涛), Xian-jun Lyu  (吕宪俊), Xiao Liu  (柳晓) & Yong-qiang Zhao  (赵永强)

  2. State Key Laboratory of Mineral Processing, Beijing, 102628, China

    Wen-tao Zhou  (周文涛)

  3. College of Resources and Civil Engineering, Northeastern University, Shenyang, 110819, China

    Yong-sheng Sun  (孙永升) & Shuai Yuan  (袁帅)

Authors
  1. Wen-tao Zhou  (周文涛)
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  2. Xian-jun Lyu  (吕宪俊)
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  3. Yong-sheng Sun  (孙永升)
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  4. Shuai Yuan  (袁帅)
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  5. Xiao Liu  (柳晓)
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  6. Yong-qiang Zhao  (赵永强)
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Corresponding author

Correspondence to Yong-qiang Zhao  (赵永强).

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Contributors

ZHOU Wen-tao developed the overarching research goals and wrote the manuscript. LYU Xian-jun conducted the literature review. SUN Yong-sheng and YUAN Shuai validated the proposed method with practical experiments. LIU Xiao wrote the first draft of the manuscript. ZHAO Yong-qiang edited the manuscript.

Foundation item

Projects(52104257, 52104259) supported by the National Natural Science Foundation of China; Project(BGRIMMKJSKL-2023-16) supported by the Open Foundation of State Key Laboratory of Mineral Processing, China; Project (skr21-3-A-022) supported by the Start Up Fund for Talent Introduction and scientific Research of Shandong University of Science and Technology, China

Conflict of interest

ZHOU Wen-tao, LYU Xian-jun, SUN Yong-sheng, YUAN Shuai, LIU Xiao and ZHAO Yong-qiang declare that they have no conflict of interest.

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Zhou, Wt., Lyu, Xj., Sun, Ys. et al. An innovative technology for utilization of oolitic hematite via microwave fluidization pretreatment: Separation characteristics and mechanism. J. Cent. South Univ. 30, 823–833 (2023). https://doi.org/10.1007/s11771-023-5278-8

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  • DOI: https://doi.org/10.1007/s11771-023-5278-8

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