Basic Information. Gongyi Xiaoyi Mingyang Machinery Plant is located in Zhengzhou City, which is the biggest manufacturing base of charcoal making machinery. And we are the one of the earliest and largest manufacturers of renewable fuel energy equipments and related machinery. After 15 years development, now our company becomes an independent ... Grinding Mill. Our Grinding Mill integrates crushing, drying, grinding, classifying and conveying together, and it is specialized in processing non-metallic minerals, pulverized coal and slag. Its coverage area is reduced by 50% compared with ball mill, and the energy consumption is saved by 30%-40% similarly.