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Volume 31 Issue 3
Mar.  2024
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文章导航 >  矿物冶金与材料学报（英文）  > 2024  >  31(3): 452-461
Xiufeng Gong, Jin Yao, Jun Guo, Bin Yang, Haoran Sun, Wanzhong Yin, Yulian Wang, and Yafeng Fu, Role of tannin pretreatment in flotation separation of magnesite and dolomite, Int. J. Miner. Metall. Mater., 31(2024), No. 3, pp. 452-461. https://doi.org/10.1007/s12613-023-2708-4
Cite this article as:
Xiufeng Gong, Jin Yao, Jun Guo, Bin Yang, Haoran Sun, Wanzhong Yin, Yulian Wang, and Yafeng Fu, Role of tannin pretreatment in flotation separation of magnesite and dolomite, Int. J. Miner. Metall. Mater., 31(2024), No. 3, pp. 452-461. https://doi.org/10.1007/s12613-023-2708-4
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研究论文

单宁预处理在菱镁矿和白云石浮选分离中的作用研究

  • 1)

    东北大学资源与土木工程学院, 沈阳 110819, 中国

  • 2)

    西南科技大学固体废物处理与资源化教育部重点实验室, 绵阳 621010, 中国

  • 3)

    中国矿业大学化学工程学院, 徐州 221116, 中国

  • 4)

    沈阳理工大学材料科学与工程学院, 沈阳 110159, 中国

  • 5)

    鞍钢集团北京研究院有限公司, 北京 102200, 中国



  • 通讯作者:

    姚金    E-mail: yaojin@mail.neu.edu.cn

    杨斌    E-mail: nemoybmaster@outlook.com

    王余莲    E-mail: ylwang0908@163.com

文章亮点

  • (1) 单宁预处理实现了菱镁矿与白云石的高效浮选分离，仅阻碍NaOl对白云石的捕收
  • (3) 预处理方法促进了单宁在白云石表面的充分吸附和强化了单宁对Ca位点的选择性作用
  • (4) 提出了从菱镁矿中分离白云石的吸附模型
  • 菱镁矿及其含钙碳酸盐矿物的浮选分离一直是一个难点问题。当前菱镁矿浮选脱钙的一些热点研究集中在新型调整剂的使用方面，传统调整剂如单宁虽然在工业上应用较多，但因在菱镁矿和白云石单矿物浮选试验中的作用效果不佳而很少作为重点研究的调整剂。在褐铁矿预先脱泥方法与菱镁矿调浆搅拌前添加调整剂做法的启发下，本研究创新地使用了单宁预处理方法分选菱镁矿和白云石，即使用单宁预处理菱镁矿和白云石单矿物，将处理后的两种矿物样品开展浮选试验。微浮选试验发现，单宁预处理方法可以选择性大幅降低白云石的浮选回收率，却不影响菱镁矿的浮选回收率。接触角测量表明，NaOl存在时，单宁预处理菱镁矿的接触角大幅上升，而白云石则下降。Zeta电位和傅立叶变换红外分析表明，单宁预处理方法高效地阻碍了NaOl在白云石表面的吸附，却无法阻碍NaOl在菱镁矿表面的吸附。X射线光电子能谱和密度泛函理论计算表明，单宁与白云石之间的相互作用能力要明显强于单宁与菱镁矿之间的相互作用能力，单宁与白云石Ca位点之间的强烈选择性作用是抑制白云石浮选的关键因素。
    • Research Article

    Role of tannin pretreatment in flotation separation of magnesite and dolomite

    + Author Affiliations
      Abstract
    • Flotation separation of magnesite and its calcium-containing carbonate minerals is a difficult problem. Recently, new regulators have been proposed for magnesite flotation decalcification, although traditional regulators such as tannin, water glass, sodium carbonate, and sodium hexametaphosphate are more widely used in industry. However, they are rarely used as the main regulators in research because they perform poorly in magnesite and dolomite single-mineral flotation tests. Inspired by the limonite presedimentation method and the addition of a regulator to magnesite slurry mixing, we used a tannin pretreatment method for separating magnesite and dolomite. Microflotation experiments confirmed that the tannin pretreatment method selectively and largely reduces the flotation recovery rate of dolomite without affecting the flotation recovery rate of magnesite. Moreover, the contact angles of the tannin-pretreated magnesite and dolomite increased and decreased, respectively, in the presence of NaOl. Zeta potential and Fourier transform infrared analyses showed that the tannin pretreatment method efficiently hinders NaOl adsorption on the dolomite surface but does not affect NaOl adsorption on the magnesite surface. X-ray photoelectron spectroscopy and density functional theory calculations confirmed that tannin interacts more strongly with dolomite than with magnesite.
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