标题：Energy-size reduction of mixtures of anthracite and coking coal in Hardgrove mill
作者：Lu, Qichang; Xie, Weining; Zhang, Fengbin; He, Yaqun; Duan, Chenlong; Wang, Shuai; Zhu, Xiangnan
作者机构：[Lu, Qichang; Zhang, Fengbin; He, Yaqun; Duan, Chenlong] China Univ Min & Technol, Sch Chem Engn & Technol, Xuzhou 221116, Jiangsu, Peoples R China.; 更多
通讯作者：Xie, Weining;Xie, WN
通讯作者地址：[Xie, WN]China Univ Min & Technol, Adv Anal & Computat Ctr, Xuzhou 221116, Jiangsu, Peoples R China.
关键词：Heterogeneous grinding; Various coalification degrees; Energy-size; reduction; Split specific energy; Genetic algorithm
摘要：Aiming to maximize the utilization of coal resource, heterogeneous grinding of coal in various coalification degrees is common. Interaction among particles of different coals in mixture breakage results in changes of energy-size reduction characteristics if compared with that of single grinding. In this paper, anthracite and coking coals of low ash are ground together in a Hardgrove mill, and resistance to be broken is compared based on the classical breakage model. Product t(10) of component after mixture breakage are determined by the relation between characteristic ratio (ratio of height and full width at half maximum of 002 peak) and yield of anthracite coal in mixture. Results indicate that product t(10) of anthracite coal increases as more coking coal is added, and that of coking coal shows the contrary trend. A new method is proposed for the determination of energy split factors of components based on the assumption that the relation t(10) and spilt energy of component still can be modelled by the classical breakage model. Besides energy split factors of components, breakage indictors are also determined according to above assumption and energy balance by genetic algorithm. Soft coking coal promote the energy-size reduction of hard anthracite coal in mixture breakage, with the increase of breakage indicator (A and b) and energy efficiency compared with those of single breakage. Energy split factors of anthracite coal is above one, and increases with the product fineness. And coking coal shows the contrary trend.