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

Chuang Li; Chuan-yao Sun; Yu-lian Wang; Ya-feng Fu; Peng-yun Xu; Wan-zhong Yin

doi:10.1007/s12613-019-1898-2

Volume 27 Issue 4

Apr. 2020

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2020 > 27(4): 432-442

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

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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

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Research Article

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

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

Wan-zhong Yin E-mail: yinwanzhong@mail.neu.edu.cn
Received: 30 May 2019; Revised: 26 September 2019; Accepted: 27 September 2019; Available online: 14 February 2020

Abstract

Abstract

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.
- low-grade magnesite;
- vertical roller mill;
- reverse flotation;
- positive flotation;
- new beneficiation process

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