Research on new beneficiation process of low-grade magnesite using vertical roller mill
来源期刊：International Journal of Minerals Metallurgy and Materials2020年第4期
论文作者：Chuang Li Chuan-yao Sun Yu-lian Wang Ya-feng Fu Wan-zhong Yin
文章页码：432 - 442
摘 要：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 81.6 wt% of particles less than 0.074 mm, a dodecyl amine（DDA） dosage in magnesite reverse flotation of 100 g·t-1, and dosages of Na2 CO3,（Na PO3）)6, and Na OL 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 Mg O and a 5.88%increase in the recovery of Mg O. 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 lowgrade magnesite.
Chuang Li1,2,3，Chuan-yao Sun2，Yu-lian Wang2,3，Ya-feng Fu1,4，Wan-zhong Yin1,4
1. School of Resources and Civil Engineering, Northeastern University2. State Key Laboratory of Mineral Processing3. School of Materials Science and Engineering, Shenyang Ligong University4. College of Zijin Mining, Fuzhou University
摘 要：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 81.6 wt% of particles less than 0.074 mm, a dodecyl amine（DDA） dosage in magnesite reverse flotation of 100 g·t-1, and dosages of Na2 CO3,（Na PO3）)6, and Na OL 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 Mg O and a 5.88%increase in the recovery of Mg O. 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 lowgrade magnesite.
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