NIOSHTIC-2 Publications Search
Powder Agglomerator and Its Method of Use.
U S Pat 4 174 937 1979 Nov; :
From a collection bin, the dust particles are discharged by gravity upon a lower rapidly rotating smooth horizontal disk. The bin discharge is offset slightly from the disk's center so that the particles are subjected to centrifugal force to move them to the disk's outer periphery. At the point where the particles are discharged onto the disk, a liquid binder, like water, is sprayed on the particles to cause them to begin to agglomerate. After being sprayed, the wetted particles are agglomerated under the influence of centrifugal and tangential forces. When they reach the disk's raised edge, the particles are completely agglomerated at which time they fall over the edge into a discharge hopper located below. Except for its slightly raised peripheral edge, the horizontal disk surface is almost perfectly smooth. The disk's shape including its slightly raised peripheral edge insure a short residence time for the wetted particles before they are agglomerated and discharged. Thus, for a 13.5 In diameter disk with a raised edge 1 in high, rotating at 120 rpm, copper reverberatory dust was fed at a rate of 1,180.3 G/min, with water sprayed at 8.5 to 10 percent of the dust weight. A flat plate scraper with a horizontal top length of 7 in and a v-shaped bottom with an angle with the horizontal equal to the height of the edge divided by the radius of the disk, distributes the particles evenly over the surface, and results in agglomerated particles overflowing the edge in a uniform stream.
U.S. Pat. 4,174,937, Nov. 20, 1979; Chem. Abstr. Not Found
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division