Efficient production of landplaster by collecting and classsifyi

Details Efficient production of landplaster by collecting and classsifyi Efficient production of landplaster by collecting and classsifyi

1996-04-10

1998-06-23

Husar, John M.

Solid material comminution or disintegration

Processes

With application of fluid or lubricant material

241 23, 241 241, 241 29, B02C 1912, B02C 2308

Patent

active

057693323

ABSTRACT:
A landplaster production method includes the steps of providing a supply of particulate gypsum material, drying the gypsum material by passing a stream of heated air thereby as the material is rotated, classifying and separating the dried particles into fines and coarse particles, collecting the suspended fines in a collector, passing the coarse particles to a grinder such as a roller mill for reducing the particles, and mixing the reduced particles with the collected fines for processing into landplaster. The elimination of fines from the feed to the grinder results in significantly greater production by increasing the efficiency of the grinder. Further, the dryer is modified to agitate the dried gypsum material so that it may be more easily introduced into the classifier/separator situated adjacent the drier discharge outlet.

REFERENCES:
patent: 5392998 (1995-02-01), Suessegger et al.
patent: 5433388 (1995-07-01), Hirz et al.
patent: 5580002 (1996-12-01), Ward et al.
Nordberg .RTM. Grinding Mills Bulletin, Bulletin 463, Feb., 1982, Rexnord Inc., Process Machinery Division, Milwaukee, Wisconsin, esp. pp. 23 & 27.
ABB Raymond Tech Talk, First Issue 1991, vol. IX, No. 1, esp. pp. 1 & 3.
"Construction Materials", Gypsum and Anhydrite, Frank C. Appleyard, Industrials Minerals and Rocks, 5th ed., S.J. Lefond, ed., AIME, 1983, pp. 183-198, esp. p. 191.

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