Process for producing tobermorite and ettringite

Details Process for producing tobermorite and ettringite Process for producing tobermorite and ettringite

1979-06-22

1981-01-06

Meros, Edward J.

Compositions: coating or plastic

Materials or ingredients

Miscellaneous

106 1812, 423117, 423123, 423159, 423331, 423518, C09C 102, C01B 3324, C01F 776

Patent

active

042434297

ABSTRACT:
A lime material and a siliceous material containing 10 to 40% by weight of alumina are admixed with an alkali solution, and the mixture is subjected to hydrothermal reaction with saturated water vapor at 4 to 40 kg/cm.sup.2 to form tobermorite. The reaction mixture is filtered to separate the tobermorite therefrom. A lime material and a gypsum material are added to the resulting filtrate, and the mixture is reacted at room temperature to a temperature of 90.degree. C. to form ettringite. The alkali filtrate separated from the ettringite is reused for the production of tobermorite.

REFERENCES:
patent: 1422004 (1922-07-01), Sherwin
patent: 1522698 (1925-01-01), Parsons
patent: 1971354 (1934-08-01), Scheidt et al.
patent: 2888377 (1959-05-01), Allen
patent: 3501324 (1970-03-01), Kubo
patent: 3642437 (1972-02-01), Angstadt et al.
patent: 3992220 (1976-11-01), Baudovin et al.
patent: 4002484 (1977-01-01), Baudovin

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