抄録
A novel dry type high gradient magnetic separation (HGMS) device comprising a fluidized bed is investigated for the purpose of obtaining pulverized Chinese coal beneficiation. The ash component of Chinese coal, indicating high magnetic susceptibility, can be cleaned well by this device compared with other coals such as Australian coal. The separation performance of the device tested is related to the magnetic field, gas velocity, processing time and process repetition frequency. The fluidization of the coal was found to be the most essential factor for obtaining good separation. Increase in magnetic susceptibility of the coal is observed by means of a pre-heating process, but improvement in the separation performance concerning the ash is not yet confirmed. Correlation points between the ash reduction and the coal recovery are centered in one curve in spite of the various parameters. About 30% ash reduction at 90% coal recovery and 45% ash reduction at 80% coal recovery are expected.
