 |
|
|||
|
|
|
|||
 |
|
Fine coal dry classification and separation 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. |
|
