Method, apparatus and use of chelating agents for the purification of calcium sulphate
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United States of America Patent
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-
Dec 7, 2004
Grant Date -
Dec 19, 2002
app pub date -
Oct 29, 2001
filing date -
Apr 29, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A chemical process for the purification of CaSO.sub.4 utilizes the ability of an aqueous solution of a chelating agent to selectively dissolve CaSO.sub.4 in that the initial extraction can be carried out at certain pH and CaSO.sub.4 can be recovered by titration to a different pH (usually a a lower pH) following a mechanical treatment, such as centrifugation or filtration, to separate the aqueous chelate solution from insoluble material. Also claimed are an apparatus and the use of chelating agents therefor.
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