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

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 magnesit...

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Bibliographic Details
Published in:International journal of minerals, metallurgy and materials metallurgy and materials, 2020-04, Vol.27 (4), p.432-442
Main Authors: Li, Chuang, Sun, Chuan-yao, Wang, Yu-lian, Fu, Ya-feng, Xu, Peng-yun, Yin, Wan-zhong
Format: Article
Language:English
Subjects:
Anniversaries
Beneficiation
Ceramics
Characterization and Evaluation of Materials
Chemistry and Materials Science
Circuits
Civil engineering
Composites
Corrosion and Coatings
Dosage
Experiments
Fineness
Flotation
Glass
Magnesite
Magnesium carbonate
Magnesium oxide
Materials Science
Metallic Materials
Metallurgy
Mineral processing
Minerals
Natural Materials
Process parameters
Reverse flotation
Roller mills (grinders)
Surface roughness
Surfaces and Interfaces
Thin Films
Tribology
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Summary: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 gt -1 , and dosages of Na 2 CO 3 , (NaPO 3 ) 6 , and NaOL in the positive flotation section of 1000, 100, and 1000 gt −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.
ISSN:1674-4799
1869-103X
DOI:10.1007/s12613-019-1898-2