Fine coal dry classification and separation

F. Maoming*, C. Qingru, Z. Yuemin, L. Zhenfu, Z. Xinxi, Y. Guohua

School of Chemical Engineering and Technology, China University of Mining and Technology Xuzhou 221008, Jiangsu Province, P. R. China

Received 23 September 2002; accepted 10 June 2003


The quantities of coal being separated and the levels of separation required are increasing while the quality of raw coals is decreasing. Although coal is currently cleaned with the minimum of size reduction, fine particle processing, recovery, and tailings disposal are major problems. Furthermore, adequate water resources are not always available. For example, two thirds of China’s coal are located in arid areas. Hence, dry separation provides an alternative approach. Of the dry coal separation methods available, air dense-medium fluidized beds have been used to separate 50~6mm coal efficiently. However, excessive bubbling and back mixing of the separated solids in the air-dense media fluidized bed causes the high lower size limit of 6mm for the feed material, this affecting the preparation efficiency. Based on prior study on air-fluidized dense media for 6~50mm coal preparation, this paper presents methods and test results on the fine coal dry classification, static electricity beneficiation of 0~0.5mm coal, and magnetically stabilized fluidized beds for separating 0.5~6mm coal.

Keywords: Fine coal; Classification; Separation; Magnetically stabilized fluidized beds; Static electricity beneficiation

* Corresponding author
   E-mail : Fmaoming@pub.xz.jsinfo.net