This patent describes an apparatus for separating suspensions of catalyst particles and gaseous hydrocarbons and for stripping hydrocarbons from the catalyst particles after traversing a riser conduit. 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. 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. Of the dry coal separation methods available, air dense-medium fluidized beds have been used to separate 50-6mm coal efficiently. Hence, dry separation provides an alternative approach. For example, two thirds of China's coal are. Furthermore, adequate water resources are not always available. Although coal is currently cleaned with the minimum of size reduction, fine particle processing, recovery, and tailings disposal are major problems. The quantities of coal being separated and the levels of separation required are increasing with the demand of environmental protection.
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