Lafarge

Lafarge Sa

Lafarge (societe Anonyme)

Societe Anonyme Dite: Lafarge

Jean-Pierre Caspar

Jacques Baudouin

Jacques Gaillard

Bernard Lelong

A method of producing mineral fillers containing hydrated calcium monocarboaluminate. Al(OH).sub.3, CaCO.sub.3 and Ca(OH).sub.2 are reacted together in the presence of water, the operating temperature range being of 50.degree. C.-100.degree. C. Although these materials are insoluble, a quick reaction occurs as well in a highly concentrated solid medium as in a diluted medium. According to a preferred embodiment, the amount of water is such to obtain a final dry matter content of 50%, and the substantially solid resulting paste is directly brought to the fluidity required for use by means of a defloculating agent. Application to paper coating.

Method to produce mineral fillers containing hydrated calcium

A binder for producing mortars or micro-concretes containing, by weight, 87% CPA 400 or CPA 500 cement, 13 to 19% aluminous cement and 0.1 to 1.0% of an organic agent. The mortars and micro-concretes prepared by means of said binder are adapted to spraying, in the moist state, or trowelling onto vertical, inclined or horizontal supports without any particular precautionary measure.

Novel binder and its utilization for preparing quick-setting mortars and

The object of the present invention is a plaster obtained from phosphogypsum and its process of obtention. The plaster according to the invention contains phosphatic impurities which are fundamentally in the form of brushite and monetite of the formula CaHPO.sub.4, which corresponds in infra-red spectrometry to the appearance of a peak characteristic of this formula, said plaster having a normal setting time.

Plaster obtained from phosphogypsum and its process of obtention

The present invention relates to an improvement in the process of U.S. Pat. No. 4,002,484, making it possible to obtain ettringite in fiber form. According to the invention, the process is carried out in the same way as in U.S. Pat. No. 4,002,484 but with enough water to assure having a suspension containing a maximum of 25% dry matter at the end of the reaction, and in subjecting said suspension to moderate stirring of 1 to 5 times the force necessary to maintain a homogeneous suspension. Application to the replacement of asbestos fibers, notably as a fire-proof product.

Process for the preparation of ettringite fibers

A process includes hydrating between about 10.degree. and 100.degree. C, one of the synthesized anhydrous calcium aluminates prepared specially or stemming from the manufacture of hydraulic binders or of anhydrous calcium silicates, groundup to an average degree of fineness, with a quantity of water of such an order of magnitude that a paste is formed, having dry extracts between about 5 and 70% by weight; subjecting at least the large particles to a vigorous agitation during the hydration to form a suspension, drying the formed suspension to a dry powder and collecting the obtained dry powder.

Manufacturing process of mineral charges, products obtained and their

A hydrated mineral charge is manufactured by grinding a composition selected from the group consisting of calcium aluminates, aluminous cements, and Portland cements, to a powder having an average fineness of from about 3,000 to about 5,000 square centimeters per gram (Blaine's specific surface), hydrating the composition with water to form a paste at a temperature from about 10.degree. C to about 100.degree. C, and adding a sufficient quantity of a liquefying surface active agent to the paste so that its viscosity is less than about 5,000 cps, and so that the paste has a solid content from about 60 percent to about 80 percent by weight.

Process for obtaining mineral charges and their application

A calcium-alumino composition formed by carbonating at a temperature between about 20.degree. to 100.degree. C, a hydrate of a water paste of an anhydrous calcium-alumino binder and an anhydrous calcium-silico binder formed at a temperature between about 5.degree. and 100.degree. C, said paste having a dry extract of about 5 to 70% by weight.

Composition of calcium carboaluminates and of tobermorites, process for

A composition is essentially of an ettringite base and contains from about 45 to 93% calcium trisulfoaluminate and from about 7 to about 55% tobermorites, of which from about 0 to 25% is hydrated silica, counted in the form of SiO.sub.2.

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Le Teil, France

Jean-Pierre Caspar