B - Operations – Transporting – 07 – B
Patent
B - Operations, Transporting
07
B
209/22
B07B 13/00 (2006.01) B03B 1/04 (2006.01) B03B 5/00 (2006.01) B03B 7/00 (2006.01)
Patent
CA 1243984
ABSTRACT OF THE INVENTION A mixture containing oleophilic surfaced mineral particles and oleophobic gangue particles in an aqueous phase is separated by means of an apertured oleophilic endless sieve supported in a separating zone by a revolving cylindrical cage having apertured sidewalls and supported in a recovery zone by a support roller, each section of sieve surface alternately revolves through the separation zone and recovery zone. The aqueous mixture is introduced as a slurry into the rotating cage in the separation zone. The endless sieve partly covers the outside surface of the cylindrical cage sidewall. An oleophilic adhesive is placed on the sieve as a coating or added to the aqueous slurry in the cage or both. The adhesive attracts the oleophilic mineral particles. The mixture tumbles inside of the cage and thereby is brought up to sieve speed and passes through the cage sidewall apertures to the sieve surface. Aqueous phase of the mixture passes through the sieve apertures into a bath from where it is removed. The oleophilic mineral particles of the mixture adhere to the oleophilic adhesive and are captured by the sieve upon contact and conveyed out of the separation zone. Some residual aqueous phase is removed from the sieve after which it passes into the recovery zone where the mineral particles and some adhesive are removed from the sieve as a mixture. In the recovery zone, mineral particles and adhesive mixture are removed from the sieve by squeezing the mixture on the sieve between two rollers. At least one of these rollers is oleophilic and pulls mixture out of the sieve apertures which mixture coats the roller surfaces and revolves back to the nip between the rollers and is squeezed off. This may be done with the sieve as it enters the recovery zone without heating it or the sieve and the mixture on the sieve may be heated with a hot roller to make squeezing off of the mixture easier. Alternately, the mineral particles and adhesive mixture on the sieve may be heated in the recovery zone and, because of its apertured surface, be blown off, shaken off or thrown off the sieve under the in fluence of an applied force.
457514
Kruyer Jan
Kruyer Jan
Smart & Biggar
LandOfFree
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