Process for using dross residues to produce refractory products

Details Process for using dross residues to produce refractory products Process for using dross residues to produce refractory products

1990-01-22

1992-07-21

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Refractory

501 94, 501 98, 501108, 501155, 75 1019, 75 1021, C04B 3502, C04B 3510, C04B 3558, C04B 3562

Patent

active

051322463

ABSTRACT:
A process for using nitride-containing aluminum dross residues to produce refractory products. The process involves mixing a dross residue which contains AlN, without prior conversion of the aluminum nitride in the dross to aluminum oxide or hydroxide, with a material comprising a metal oxide or a metal oxide precursor, and calcining the resulting mixture at a temperature suitable to produce a refractory product. During the calcination step, the AlN reacts with other components of the mixture. Since the reaction is exothermic, less heat is required for the calcination step than if a dross residue containing no AlN were used. The AlN can also reduce various contaminants (e.g. Fe.sub.2 O.sub.3, silicon and titanium) present in the metal oxide refractories, and so the invention can be used to produce conventional refractory products of improved purity and appearance. The process enables dross residues to be used for useful purposes rather than being discarded.

REFERENCES:
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patent: 4952237 (1990-08-01), Dube et al.
patent: 4959100 (1990-09-01), Dube et al.
patent: 4960460 (1990-10-01), Dube et al.
patent: 4985382 (1991-01-01), Nadkarni et al.
Gillespie--CIM Bulletin of Jan. 1948 "The Manufacture of Mineral Wool".
Nafziger et al--CIM Bulletin of Aug. 1976 "ELECTRIC FURNACE MELTING OF BY-PRODUCT METALLURGICAL SLAGS".
Vaillancourt--Le Quebec Industriel--May 1988--pp. 32, 33 "CAFCO FAIT PROGRESSER L'USAGE DU FOUR A ROC ELECTRIQUE".
Vaillancourt--Le Quebec Industriel--May 1988--pp. 32, 33 "CAFCO FAIT PROGRESSER L'USAGE DU FOUR A ROC ELECTRIQUE".

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