Method of and apparatus for screening bulk material
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United States of America Patent
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Feb 13, 2001
Grant Date -
N/A
app pub date -
Dec 16, 1998
filing date -
Dec 17, 1997
priority date (Note) -
Expired
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Abstract
In a method of screening bulk material, a gas is conducted in counterflow to a direction of movement of bulk material for separating the bulk material into a fraction of coarse particles and a fraction of fine particles. In order to limit the amount of coarse particles in the outgoing fraction of fine particles, the amount of coarse particles contained in the fraction of fine particles is measured and compared with a desired value. When encountering a deviation of the measured the amount of coarse particles contained in the fraction of fine particles form the desired value, the energy of gas is so controlled as to match the amount of coarse particles contained in the fraction of fine particles with the desired value.
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