Pulverizing and classifying apparatus with improved tailings and contaminant take-out control
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United States of America Patent
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Apr 8, 1980
Issued Date -
N/A
app pub date -
Oct 4, 1978
filing date -
Aug 8, 1977
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A horizontal axis pulverizing and classifying apparatus characterized by a plurality of gas flow passages in a narrow band surrounding the classification zone and directed generally radially inward, and means for selectively and variably introducing gas to those passages. The apparatus may also be fitted with special means for removing contaminating particles which reduce the capacity and efficiency of such apparatus. The take-out device is a porous tubular duct communicating with the classification zone of the apparatus through the housing wall. The porous tubular duct is surrounded by a non-porous tubular casing forming an annulus connected to a source of gas under pressure. Control over the quantities of tailings recycled and over quantities of contaminants removed is exercised by varying the amount and pressure of gas introduced through the gas flow passages.
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