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US 5,487,879 AGranted
Stabilized, pressure-hydrated magnesium hydroxide slurry from burnt magnesite and process for its production
AssigneeMartin Marietta Magnesia Specialities Inc.
InventorsJoseph T. Witkowski, David M. Smith, Mark T. Wajer
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Abstract
A stabilized, pressure-hydrated magnesium hydroxide slurry and a process for its production from burnt magnesite are described. According to an embodiment of the invention, a mixture comprising burnt natural magnesite and water is pressure hydrated to provide a pressure hydrated slurry. The pressure hydrated slurry is then deagglomerated. If desired, chloride ions and cationic polymer can be added to further stabilize the slurry.
Claims16
A process for the production of a stabilized magnesium hydroxide slurry comprising the steps of:
- pressure hydrating a mixture comprising burnt natural magnesite and water to provide a precursory pressure hydrated magnesium hydroxide slurry;
- providing chloride ions and cationic polymer;
- deagglomerating said precursory pressure hydrated magnesium hydroxide slurry in the presence of said chloride ions and cationic polymer to provide a deagglomerated and stabilized magnesium hydroxide slurry comprising from 50 to 65 weight % solids.
Dependencies are inferred from the claim text.