PROCESS FOR TREATING FLUIDIZED CARBON BLACK WITH GASES, FLUIDIZING APPARATUS FOR CARRYING IT OUT AND DEVICE FOR INDICATING THE LIMIT OF THE BED TO BE USED IN THE APPARATUS

摘要

Method for the treatment of fluidized carbon black with gases in a fluidized bed, wherein the carbon black and the treatment gases are conveyed for introduction in an unique operating procedure into the treating region in a countercurrent stream manner. The mass stream of the carbon black and the treating gases are held constant and the mass streams of the starting carbon black or the treated carbon black is regulated with the help of an optical electrical level sensor means so that the height of the fluidized bed is bed is held on a predetermined level. An apparatus is shown for the carrying out of the fluidized bed countercurrent process which has a novel carbon black product delivery system and is provided with a optical electrical level sensor means for controlling the level of the fluidized bed. The sensor means comprises a hair pin shaped lighting circuit composed of two legs or rods separated by a gap. A light source impinges on the end of one of he said legs and the other leg is oriented to an electrical signal generating light sensor.