RAW MIXTURE FOR MAKING CERAMIC OBJECTS Russian patent published in 2009 - IPC C04B35/16 

FIELD: chemistry.

SUBSTANCE: invention relates to production of ceramic objects for construction purposes and can be used in making bricks, building tiles, roofing tiles, large-sized wall blocks, paving objects. The raw mixture for making ceramic construction objects contains natural sand, blast-furnace and/or steel-smelting slag, where SiO₂ content in the mixture lies between 70 and 85%, with the following ratio of components, wt %: natural sand - 60 to 80; blast-furnace slag - 0 to 40; steel-smelting slag - 0 to 40; soluble glass - 0 to 5. The method of making ceramic construction objects from the said raw mixture involves preparation of the raw mixture, moulding objects and calcination. The raw mixture undergoes combined grinding to particle size of 20 to 50 mcm. Moulding is done at pressure ranging from 35 to 150 MPa, and calcination is done in the following procedure: raising temperature to 500°C at a rate of 150 to 200°C/hour, then to 1050 to 1150°C at a rate of 65 to 150°C/hour, maintaining temperature of 1150°C for 1 to 2 hours, and then cooling at a rate of 100 to 150°C/hour.

EFFECT: increased compression strength and frost-resistance of the material, use of natural sand as the main component of the raw mixture and recycling various wastes (blast-furnace and steel-smelting slag).

2 cl, 3 tbl, 1 ex