Method for treatment of aluminum dross oxides

Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group iiia metal or beryllium

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423353, 423 1, 585700, 203 20, C01F 702

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active

044341423

ABSTRACT:
There is disclosed a method for the treatment of aluminum dross oxides which contain aluminum metal, aluminum carbide, aluminum nitride and salts such as potassium and sodium chloride. The method comprises the thermal treatment of an aqueous suspension of the dross oxides with agitation in the presence of a particulate grinding medium. The method is practiced in a stirred reactor vessel which contains a bed of refractory, ceramic balls that are agitated with a slurry to provide a sufficient abrading action on the aluminum metal particles to remove the aluminum hydroxide coating and continually expose the aluminum metal for reaction with the water. This invention comprises the introduction of a purge gas into the suspension, preferably air, during its thermal treatment to reduce the formation of foam during the treatment and to assist in liberation of ammonia formed by the decomposition of the aluminum nitride.

REFERENCES:
patent: 2027115 (1936-01-01), Oman et al.
patent: 3955969 (1976-05-01), Johnson
patent: 4160815 (1979-07-01), Huckabay
patent: 4252776 (1981-02-01), Huckabay et al.
patent: 4320098 (1982-03-01), Huckabay et al.

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