Method for preparing high purity aluminum hydroxide

Details Method for preparing high purity aluminum hydroxide Method for preparing high purity aluminum hydroxide

1994-08-30

1995-07-25

Bos, Steven

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

423629, 423127, C01F 702

Patent

active

054359864

ABSTRACT:
An improved process for making high purity aluminum hydroxide [Al(OH).sub.3.3H.sub.2 O] of the hydrargillite form containing the steps of: (a) adding a non-powdered aluminum solid, preferably aluminum ingots, into a hot water bath at about 70.degree. C. to form a reaction mixture; (b) stirring the reaction mixture for about 20 minutes: (c) adding an alkaline-generating solid, preferably sodium hydroxide solids, into the reaction mixture and heating the reaction mixture to reach boiling point temperature; (d) lowering the temperature of the reaction mixture to 75.degree..about.80.degree. C. and stirring the reaction mixture for about 60 minutes; (e) lowering the temperature of the reaction mixture to room temperature; and (f) filtering the reaction mixture to obtain the high purity aluminum hydroxide form. The high purity of the final product was confirmed by data from X-ray diffraction and thermogravimetric analysis. Compared to the prior art processes this process has the advantages that: (1) it does not require a crystallization seed nor a gaseous reactant, thus greatly simplifying the production procedure; and (2) it does not involve a hydrofluoric acid, thus greatly improving logistics and the safe handling of the production operation.

REFERENCES:
patent: 2733219 (1956-01-01), Bloch
patent: 2958582 (1960-11-01), Hervert et al.
patent: 2989372 (1961-06-01), Gilbert
patent: 3071436 (1963-01-01), Hervert et al.
patent: 3488147 (1970-01-01), Keith et al.
patent: 3494733 (1970-02-01), Keith et al.
patent: 4612184 (1986-09-01), Seigneurin
patent: 4755374 (1988-07-01), Martin et al.
patent: 5100641 (1992-03-01), Schmidt et al.
patent: 5225229 (1993-07-01), Martin et al.

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