B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
182/73
B01D 29/00 (2006.01)
Patent
CA 1188626
ABSTRACT A method and apparatus for the filtration thickening of liquid-solids mixtures, such as mine tailings are disclosed. One embodiment incorporates a support screen on one side of a filter cloth, said filter cloth having a plurality of impermeable strips arranged to form individual filtering areas separated from each other whereby filter cake forms on one side of said filter cloth when the liquid of a liquid-solids mixture flows through the filter cloth and through the support screen. When the flow is reversed the filter cake is dislodged from the filter cloth in individual segments corresponding to the filtering areas between the strips. Another embodiment of the invention combines an accumulator grating on the side of the filter cloth opposite the support screen, whereby when the flow is reversed the filter cake formed on the filter cloth is squeezed into a plurality of spaces and gripping surfaces on the accumulator grating and is eventually extruded through the accumulator grating. The support screen may be partially vertically corrugated having a perimeter length substantially equal to or slightly less than the inner perimeter length of the accumulator grating such that the filter cloth remains unstressed whether pressed inwardly against the support screen or outwardly against the accumulator grating. A plurality of said filter units are suspended in a tank for communication with a filtrate compartment spaced from the filter units whereby during the filtering process the liquid of the liquid-solids suspension flows through the filter units to the filtrate compartment. Gravity and/or pump means provide a reverse flow from the filtrate compartment through the filter units to backwash the filter cloth and dislodge filter cake. Dislodged filter cake is accumulated at the base of the tank for intermittent discharge therefrom.
409141
Laing David H.
Robinsky Eli I.
Gowling Lafleur Henderson Llp
Laing David H.
Robinsky Eli I.
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