Document Archives

Fluid Bed Makes Lighter Product

• ID:

  2295

• ESCSI:

  9135.003

• Author:

  Cohen, Sidney M. and Thomas R. Lawall

• Publication Name:

  Rock Products

• Type of Publication:

  Article

• Publisher:

  Maclean Hunter Publications

• Dated:

  1989

• Issue/Volume:

  July, Vol. 92, No. 7

• Other ID:

• Page(s):

  42-42, 44

• Reference List:

  N

• Abstract:

  The demand for a totally sealed aggregate for concrete block is still with us. A block mix aggregate, other than that which is produced by crushing a coarser aggregate, is needed, in order to avoid the open, internal pore structure of such aggregate.The fluid-bed reactor process is a solution to the problem involved in producing a totally sealed fine aggregate. In tests conducted, it was found that a lighter weight product can be produced in the fluid bed than in the rotary kiln on the same feed material. The rotary kiln tests were conducted in a 12-in. x 15-ft rotary unit, while an 18-in.-diameter fluid-bed reactor was used for comparison.
  At 2100° F, the rotary kiln produced a product at 59 lb/cu ft with considerable sticking and ringing taking place. The fluid-bed system ran at 2070° F, producing a 50.5 lb/cu ft product without any operating difficulties.