Calcium carbonate of different shapes and the preparation process thereof
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United States of America Patent
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Issued Date -
Nov 25, 2004
app pub date -
Jun 30, 2004
filing date -
Dec 31, 2001
priority date (Note) -
Abandoned
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Abstract
This invention relates to calcium carbonate of different shapes including spindle, petal, whisker, needle, flake, ball and fiber. The calcium carbonate of such different shapes has an average particle size in the range of 10 nm-2.5 .mu.m. This invention also relates to a process for preparing the said calcium carbonate with a controllable range of average particle size and different shapes. Precipitated powder of calcium carbonate with a desired shape and a controllable average particle size is obtained by carbonizing a suspension of calcium hydroxide and a feed gas containing carbon dioxide on a revolving bed under the gravitational field, and optionally in the presence of a crystal form-controller and/or crystal seeds. The precipitated powder of calcium carbonate obtained by the process according to this invention has a controllable average particle size and a narrow particle distribution. It can be utilized, as desired, in various fields such as rubber, plastics, papermaking, coatings, building materials, inks, paintings, food, medicine, domestic chemical industry, textile and feed.
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