Improved mixer

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B - Operations, Transporting

01

F

B01F 13/00 (2006.01) B01F 3/12 (2006.01) B28C 5/38 (2006.01) C04B 11/00 (2006.01)

Patent

CA 2116630

The invention provides apparatus for use in the preparation of gypsum products such as plasterboard from foamed gypsum plaster slurry. The apparatus comprises a first mixing chamber containing a high speed rotor 14 and inlets for 18, 19 for gypsum plaster and water. The initial dispersion of gypsum plaster and water foamed in the first chamber passes directly and continuously into a second chamber 25 containing a low speed rotor 29. Preformed foam is introduced into the second chamber through an inlet 33, and the foamed slurry product leaves the second chamber through an outlet 34, to be formed into plasterboard. A method of making gypsum products from foamed gypsum plaster slurry is also disclosed.

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