Anhydrite binder and method

Details Anhydrite binder and method Anhydrite binder and method

1978-03-30

1979-04-24

Poer, James

Compositions: coating or plastic

Coating or plastic compositions

Proteinaceous material containing

423555, C04B 1106

Patent

active

041510003

ABSTRACT:
The present invention relates to an anhydrite binder and to the method of making the same from the gypsum by-product (phosphogypsum) resulting from the production of phosphoric acid by the wet method, said binder comprising particulate anhydrous CaSO.sub.4 with an insoluble CaSO.sub.4 content of at least 93%, an average particle size diameter of 5 to 30, with 15% by weight or more of the particles having a diameter smaller than 10.mu. and 20% by weight or more of the particles having a diameter larger than 20.mu., and a pore volume of less than 0.29cc/g in the case of pores having a radius less than about 6.6.mu..

REFERENCES:
patent: 3872204 (1975-03-01), Yano et al.

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