GB149551A - Improvements relating to decantation apparatus - Google Patents

Abstract

149,551. Denoel, J. Oct. 14, 1919. Separating by gravity.-In apparatus for separating solids from liquids bv settling, e.g. paper pulp from water, in which the material treated is introduced into the top of an inverted funnel, the separation taking place as the mixture flows down the funnel the heavy material is withdrawn continuously at the bottom apparatus, while the purified liquid flows upwards through an outer casing, so shaped that the liquid substantially maintains the velocity with which it leaves the funnel. The liquid enters the funnel 3 through a pipe 2 from a box 1, the walls of the funnel being prolonged upwards as at 16 to facilitate the escape of air. The funnel 3 is surrounded by a casing, the upper part 4 of which is so shaped that the cross-section of the spacebetween it and the funnel 3 is substantially constant, so that the velocity of the liquid flowing upwards through it is maintained substantially unchanged. The lower part 5 of the casing is preferably bell-shaped as shown, to hinder the solid matters, which are withdrawn continuously through the outlet 6, from adhering to the walls. Liquid enters the apparatus by a pipe 12 opening into a tank 11 containing a baffle 13 and communicating with the box 1 by a pipe 10. The tank 11 has a perforated cover 14 through which froth can overflow into the receptacles 15. A sprinkler pipe 17 is provided for rinsing the bottom part 5 of the casing.