Process for improving the fluidity and conveyability of moist calcium sulfate precipitates
AssigneeChemische Werke Huls Aktiengesellschaft
InventorsHans-Friedrich Kurandt, Karl-Heinz Kampner
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Abstract
A process for improving the fluidity and conveyability properties of moist calcium sulfate precipitates, having a free water content of more than about 5% by weight, which entails mixing quicklime (CaO), burnt dolomite (CaO+MgO) or a mixture thereof, in finely ground form to said moist calcium sulfate precipitate in an amount of about 10% by weight or greater, based upon the calcium sulfate content, to form a homogeneous mixture of the same. The homogenized mixtures so prepared have good pourability and can be conveniently stored or conveyed. They can be used as setting retarders in cement or, they can be used in the production of gypsum wall board and plaster.
Claims7
A process for preparing a fluid and conveyable moist calcium sulfate precipitate from calcium sulfate precipitates, having a free water content of more than about 5% by weight, which comprises adding quicklime (CaO) burned dolomite (CaO+MgO) or a mixture thereof, in finely ground form to said water-containing calcium sulfate precipitate in the amount of about 15-60 percent by weight, based upon the calcium sulfate content, to form a homogeneous mixture of the same;
- and wherein about 0.5 to 0.9 moles of finely ground quicklime, burned dolomite or a mixture thereof are added per mole of free water in said moist calcium sulfate precipitate.
Dependencies are inferred from the claim text.