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Open AccessArticle

Grinding Behaviors of Components in Heterogeneous Breakage of Coals of Different Ash Contents in a Ball-and-Race Mill

1
Advanced Analysis & Computation Center, China University of Mining and Technology, Xuzhou 221116, China
2
Mining and Minerals Engineering Department, Virginia Tech, Blacksburg, VA 24060, USA
3
Advanced Analysis & Computation Center, China University of Mining & Technology, Xuzhou 221116, China
4
School of Mining and Technology, Inner Mongolia University of Technology, Hohhot 010051, China
5
School of Chemical & Environmental Engineering, Shandong University of Science & Technology, Qingdao 266590, China
*
Author to whom correspondence should be addressed.
Minerals 2020, 10(3), 230; https://doi.org/10.3390/min10030230
Received: 30 January 2020 / Revised: 17 February 2020 / Accepted: 2 March 2020 / Published: 3 March 2020
(This article belongs to the Special Issue Comminution in the Minerals Industry)
Coals used for power plants normally have different ash contents, and the breakage of coals by the ball-and-race mill or roller mill is an energy-intensive process. Grinding phenomena in mill of power plants is complex, and it is also not the same with ideal grinding tests in labs. The interaction among various coals would result in changes of grinding behaviors and energy consumption characterization if compared with those of single breakage. In this study, anthracite and bituminous coal of different ash contents were selected to be heterogeneously ground. Quantitation of components in products was realized using the relation between sulfur content of the mixture and mass yield of one component in the mixture. Product fineness t10 of the component was determined, and split energy was calculated on the premise of specific energy balance and energy-size reduction model by a genetic algorithm. Experimental results indicate that breakage rate and product fineness t10 of the mixture decrease with the increase of hard anthracite content in the mixture. Unlike the single breakage, t10 of anthracite in heterogeneous grinding is improved dramatically, and bituminous coal shows the opposite trend. The interaction between components results in the decrease of the specific energy of the mixture if compared with the mass average one of components in single breakage. Breakage resistance of hard anthracite decreases due to the addition of soft bituminous coal, and grinding energy efficiency of anthracite is also improved compared with that of single grinding. View Full-Text
Keywords: grinding behaviors; energy consumption characterization; sulfur content; heterogeneous breakage; split energy grinding behaviors; energy consumption characterization; sulfur content; heterogeneous breakage; split energy
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MDPI and ACS Style

Duan, J.; Lu, Q.; Zhao, Z.; Wang, X.; Zhang, Y.; Wang, J.; Li, B.; Xie, W.; Sun, X.; Zhu, X. Grinding Behaviors of Components in Heterogeneous Breakage of Coals of Different Ash Contents in a Ball-and-Race Mill. Minerals 2020, 10, 230.

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