Method of making magnesiachrom refractories

Details Method of making magnesiachrom refractories Method of making magnesiachrom refractories

C - Chemistry, Metallurgy

04

B

25/141, 261/31

C04B 35/04 (2006.01) C04B 35/047 (2006.01)

Patent

CA 1197267

ABSTRACT OF THE DISCLOSURE A refractory magnesia-chromium product is manufactured by a mixture of caustically burned magnesia having a grain size of less than 0.2 mm and of chromium ore having a grain size not exceeding 1.5 mm, the magnesia having a weight content of more than 97% MgO, no more than 0.2% SiO2 and no more than 0.7% Fe2O3+Al2O3, and the chromium ore having a weight content of 20% to 28% FeO and no more than 1-5% SiO2, the caustically burned magnesia and the chromium ore being mixed in a ratio producing in the mixture a weight content of 10% to 30% Cr2O3 and a Cr2O3/Al2O3 weight ratio of more than 2.5, and the mixture having a weight content of no more than 1.1% CaO and no more than 0.7% SiO2, the sum of the weight content of CaO+SiO2 not exceeding 1.3%. - 15 -

424891

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