Method of manufacturing aluminum-substituted hematite

Details Method of manufacturing aluminum-substituted hematite Method of manufacturing aluminum-substituted hematite

2005-02-01

2005-02-01

Bell, Mark L. (Department: 1755)

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

C106S418000, C106S459000, C106S442000, C501S127000, C427S419300

Reexamination Certificate

active

06849115

ABSTRACT:
A method of manufacturing aluminum-substituted hematite represented by α-(Fe1-xAlx)2O3where x=0.01 to 0.15, by mixing an iron compound and an aluminum compound such that an atomic ratio of Fe to Al falls within the range of 99:1 to 85:15, adding citric acid and ethylene glycol to the mixture of the iron compound and aluminum compound to produce a gel, and pyrolyzing the gel, followed by calcining the pyrolyzed product.

REFERENCES:
patent: 4373963 (1983-02-01), Uenishi et al.
patent: 5500043 (1996-03-01), Harada et al.
patent: 5522923 (1996-06-01), Kimura et al.
A. Violante, et al., “Nature of mixed iron and aluminum gels as affected by Fe/A1 molar ratio, pH and citrate,” Journal of the European Clay Groups, vol. 33, 1998, pp. 511-519.
U. Schwertmann, et al., “The effect of A1 on Fe oxides. XIX. Formation of A1-substituted hematite from ferrihydrite,” Clays and Clay Minerals, vol. 48, No. 2, 2000, pp. 159-172.

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