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The paper shows that presence of such phases as mullite, corundum is required in order to obtain high quality refractories that are able to work effectively under the conditions of the simultaneous effects of corrosive environments, high temperatures and pressure, sudden changes in temperature. The structures of Al 2 O 3 – SiO 2 – CaO – Р 2 O 5 system are examined in the materials in which the formation of defined phases is probably. Based on data it is carried out partitioning of the system on the elementary tetrahedrons. The data on the lengths of tie lines, volumes, the asymmetry degree and the eutectic temperature of elementary tetrahedrons are given. The geometric-topological characteristic of the phases of this system are presented. The choice of oxides compositions areas for the production of refractories is justified based on the obtained results.

STUDYING OF THE STRUCTURE OF AL2O3 – SIO2 – CAO – Р2O5 SYSTEM AND ITS SIGNIFICANCE IN THE TECHNOLOGY OF REFRACTORIES