Means for controlling feed of particulate material into airlift

Details Means for controlling feed of particulate material into airlift Means for controlling feed of particulate material into airlift

1980-06-06

1982-03-16

Purser, Ernest R.

Mining or in situ disintegration of hard material

Automatic control; signaling or indicating

Of hard material disintegrating machine

37DIG1, 37DIG8, 37 57, 406 3, 406 28, 299 8, E02F 394

Patent

active

043197825

ABSTRACT:
To limit the amount of solid particulate matter fed into an airlift pipeline from, especially, a suction nozzle device, the density of the suspension passing from the suction nozzle to the airlift system is measured. If the measured density is above a predetermined value, a proportion of the suspended solid material is removed prior to passing into the airlift pipe.
The density of the moving suspension is determined by a radiation-type densitometer located upstream from the airlift pipe. The density can also be directly measured by a balance beam or weighing arrangement connected to a pivotable length of pipe. Where fine particles are present that are not to be considered in the densitometer measurement, a differential measurement can be obtained by a second measurement of the density of liquid from which the large particles have been screened.

REFERENCES:
patent: 3179471 (1965-04-01), Savage
patent: 3621593 (1971-11-01), Hickey
patent: 3971593 (1976-07-01), Porte et al.
patent: 3975054 (1976-08-01), Brockett et al.
patent: 4232903 (1980-11-01), Welling et al.

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