CONTROL OF DENSITY OF THICKENER UNDERFLOW SLURRY

摘要

1326650 Automatic control of concentration SHERRITT GORDON MINES Ltd 1 Nov 1971 [11 Jan 1971] 50747/71 Heading G3R [Also in Divisions B1 and G1] Means for controlling the solids/liquids ratio of the underflow slurry from a sedementation tank 10 regulates the rate of removal of the underflow in response to measured changes in the average specific gravity of the slurry in the tank over a vertical section between measuring apertures 26 and 27. This means comprises a differential pressure meter 30 having its low pressure chamber 29 connected by line 28 to the upper aperture 26 and its high pressure chamber 32 connected by line 31 to lower aperture 27, the lines 28 and 31 being water purged conduits. Variations in the differential pressure in chambers 29 and 32 are communicated by a force balance transmission unit 34 to gauge 35. Means may be provided for sending electrical or pneumatic signals to an apparatus controlling the speed of slurry outlet pump 24 when the average specific gravity exceeds or falls below a predetermined range.