Modified lignosulfonate dispersant for gypsum

Details Modified lignosulfonate dispersant for gypsum Modified lignosulfonate dispersant for gypsum

1991-10-16

1994-02-15

Brunsman, David

Compositions

Preservative agents

Anti-corrosion

252353, 106780, C04B 2418

Patent

active

052864120

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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