METHOD OF INERTISING THE IMPURITIES IN PHOSPHOGYPSUM
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United States of America Patent
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Issued Date -
Nov 26, 2009
app pub date -
Aug 8, 2007
filing date -
Aug 25, 2006
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Abandoned
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Abstract
The invention pertains to a method of inertising free soluble impurities of phosphates and/or fluoride ions, in phosphogypsum, for use in commercial and industrial applications. The Phosphogypsum is pre-conditioned over an extended period of time separately or treated along with standard constituents by spraying, interblending or intergrinding during the process of manufacture, with alkyl, alkenyl and/or alkanol derivatives of ammonia, either individually or in combination with one another, to form stable intermediary phosphates and/or fluoride salts of the derivatives of ammonia.
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