Chuang Li, Chuan-yao Sun, Yu-lian Wang, Ya-feng Fu, Peng-yun Xu, and Wan-zhong Yin, Research on new beneficiation process of low-grade magnesite using vertical roller mill, Int. J. Miner. Metall. Mater., 27(2020), No. 4, pp. 432-442. https://doi.org/10.1007/s12613-019-1898-2
Cite this article as:
Chuang Li, Chuan-yao Sun, Yu-lian Wang, Ya-feng Fu, Peng-yun Xu, and Wan-zhong Yin, Research on new beneficiation process of low-grade magnesite using vertical roller mill, Int. J. Miner. Metall. Mater., 27(2020), No. 4, pp. 432-442. https://doi.org/10.1007/s12613-019-1898-2
Research Article

Research on new beneficiation process of low-grade magnesite using vertical roller mill

+ Author Affiliations
  • Corresponding authors:

    Peng-yun Xu    E-mail: xupengyun01@163.com

    Wan-zhong Yin    E-mail: yinwanzhong@mail.neu.edu.cn

  • Received: 30 May 2019Revised: 26 September 2019Accepted: 27 September 2019Available online: 14 February 2020
  • We investigated whether the vertical roller mill can be efficiently used in the beneficiation of low-grade magnesite and whether it can improve upon the separation indices achieved by the ball mill. We conducted experiments involving the reverse flotation and positive flotation of low-grade magnesite to determine the optimum process parameters, and then performed closed-circuit beneficiation experiments using the vertical roller mill and ball mill. The results show that the optimum process parameters for the vertical roller mill are as follows: a grinding fineness of 81.6wt% of particles less than 0.074 mm, a dodecyl amine (DDA) dosage in magnesite reverse flotation of 100 g·t−1, and dosages of Na2CO3, (NaPO3)6, and NaOL in the positive flotation section of 1000, 100, and 1000 g·t−1, respectively. Compared with the ball mill, the use of the vertical roller mill in the beneficiation of low-grade magnesite resulted in a 1.28% increase in the concentrate grade of MgO and a 5.88% increase in the recovery of MgO. The results of our causation mechanism analysis show that a higher specific surface area and greater surface roughness are the main reasons for the better flotation performance of particles ground by the vertical roller mill in the beneficiation of low-grade magnesite.

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