Method of forming dense, unsintered, granular alkaline earth metal carbonates

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United States of America Patent

PATENT NO 4888161
SERIAL NO

07223386

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Abstract

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A method of converting fine particle size alkaline earth metal carbonate, e.g., barium or strontium carbonate, into a free-flowing granular form with relatively high bulk density, without sintering, grinding, or briquetting, is disclosed. It involves the following steps: (a) forming a suspension of the carbonate in water with enough deflocculating agent, e.g., sodium polyacrylate or sodium hexametaphosphate, to substantially completely deflocculate the carbonate; (b) drying the resultant suspension at a temperature that is elevated, but without heating the carbonate to its sintering point, for example by spray drying in a spray drier operating at an inlet temperature in the range of about 400.degree. to 600.degree. C., to obtain a granular material primarily passing 10 mesh and held on a 150 mesh screen (Tyler); and (c) heating the granular material to about 600.degree. to 700.degree. C., which causes it to shrink, thereby increasing its bulk density by at least about 5%, preferably at least 10 or 20 percent. The product is especially useful as an additive for glass used to make television face plates.

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Patent Owner(s)

Patent OwnerAddress
CHEMICAL PRODUCTS CORPORATION CARTERSVILLE GEORGIANot Provided

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Adams, Jr Charles Cartersville, GA 8 114
Cook, Jerry A Cartersville, GA 10 104

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