Modified lignosulfonate dispersant for gypsum
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United States of America Patent
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Feb 15, 1994
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N/A
app pub date -
Oct 16, 1991
filing date -
Oct 16, 1991
priority date (Note) -
Expired
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Abstract
The present invention relates to a non-set retarding lignosulfonate dispersing agent useful for making an aqueous calcined gypsum slurry, said dispersing agent produced by contacting an aqueous solution of a lignosulfonate with a salt of a multivalent metal selected from the group consisting of iron (II), iron (III), manganese (II) and cobalt (II) to form an aqueous solution of a multivalent metal salt and lignosulfonate having an acidic pH, and thereafter neutralizing said aqueous solution of said multivalent metal salt and lignosulfonate at an elevated temperature with an alkaline material.
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