MAGNESIA SPINEL-BASED FUSED MATERIAL AND METHOD OF PRODUCING SAID MATERIAL Russian patent published in 2011 - IPC C04B35/443 C04B35/626 

FIELD: chemistry.

SUBSTANCE: invention relates to production of refractory materials and can be used in production of spinel-containing refractory materials for lining thermal generating units. The disclosed magnesia spinel-based fused material, which contains MgO, Al₂O₃, SiO₂, CaO and Fe₂O₃, is characterised by that it also contains Cr₂O₃ with the following ratio of components in wt %: MgO - 25.0-30.0; SiO₂ - 1.0-3.0; CaO- 1.0-4.0; Fe₂O₃ - 0.2-0.4; Cr₂O₃ - 10.0-20.0; Al₂O₃ - the rest. The method of producing magnesia spinel-based fused material involves mechanical processing a chromium-containing by-product of industrial production in form of slag from aluminium-thermal production of ferrochromium, with the following ratio of components in wt %: MgO 12.0-20.0; SiO₂10.0-16.0; CaO 18.0-30.0; Fe₂O₃ 0.1-1.0; Cr₂O₃ 5.0-10.0; Al₂O₃ - the rest, where the ratio CaO/SiO₂ is less than 1.8. Mechanical processing is carried out by grating with separation of fractions larger than 100 mcm. Since crystals of the spinel in the said slag are concentrated in the large fraction, grating enables to obtain material which contains up to 97 wt % spinel.

EFFECT: obtaining magnesia spinel-based material with improved working characteristics using a simple method.

2 cl, 3 ex, 1 tbl