Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Alkaline earth metal
Patent
1997-10-21
1999-10-05
Bos, Steven
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Alkaline earth metal
423155, C01F 100
Patent
active
059619414
ABSTRACT:
Extraction of calcium salts from papermaking sludge or sludge-derived ash is accomplished by mixing with a solution of an inorganic or organic acid. The acid extraction typically results in solubilization of other salts as well, e.g., those of aluminum, magnesium and iron. However, because these non-calcium salts precipitate as hydroxides at lower pH than calcium hydroxide, a caustic (or any other alkaline agent, in a solid or liquid form) is gradually added to precipitate non-calcium salts to facilitate their removal from solution (generally by filtration or centrifugation) prior to precipitation of calcium hydroxide. The desired calcium salt is then precipitated through addition of the appropriate acid anion (either by way of the acid or a salt having greater water solubility than the resulting calcium salt).
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Klyosov Anatole A.
Monovoukas Yiannis A.
Philippidis George P.
Bos Steven
Hendrickson Stuart L.
Thermo Fibergen Inc.
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