| 摘要 |
The invention relates to electrostatic separation of coal from toxic and pyritic elements and ash compounds. More particularly this invention relates to separation of coal from refuse material by imparting opposite electrostatic charges to coal and refuse particles, passing them between oppositely charged electrodes and mechanically separating the electrostatically attracted diverging coal and refuse particles. The electrostatic attraction and divergent separation process is maximized by performing the charging and separation functions within a continuously vacuum reduced atmosphere. The use of a vacuum exhaust to continuously remove water and water vapor can prevent charge dissipation of the coal particles through charge transfer to water and water vapor. Additionally, the vacuum reduced atmosphere can prevent impairment of electrostatic influence due to gas turbulence. |
