CERAMIC MIXTURE Russian patent published in 2009 - IPC C04B33/132 

FIELD: chemistry.

SUBSTANCE: invention relates to compositions of ceramic mixtures for making wall structures, mainly brick, and can be used in the industry of construction materials. The ceramic mixture for making bricks contains acidic loam, expanded-clay, residue from filters for removing iron from fresh water, containing the following in wt %: Fe(OH)₃ - 44 to 50 in terms of Fe₂O₃, organic impurities (plant residue) - 10, mineral component: CaCO₃, MgCO₃, CaSO₄ - the rest, in the following ratio of components in wt %: loam - 60 to 85; expanded-clay - 15 to 40; residue from filters for removing iron from fresh water, over 100% - 0.05 to 1.3. The said ratio of components of the ceramic mixture provides for obtaining Al₂O₃ content from 13.4 to 14.5 wt % and Fe₂O₃ - 6.8 to 7.6 in calcinated substance.

EFFECT: increased strength-to-weight ratio and prevention of overall contraction.

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