FIELD: building materials production. SUBSTANCE: raw materials mixture comprises, mas. %: clay, 91-95; mineral filler, 5-9. Vermiculite with fraction 0.63-0.0 mm in size is used as mineral filler. Vermiculite comprises, mas. %: $$$, 40.15; $$$ 1,16; $$$, 11.01; $$$, 14.05; FeO, 1.0; MnO, 0.10; CaO, 1.44; MgO, 17.49; $$$, 0.32; $$$, 4.19; $$$, 0.15; $$$, 0.05; F, 1.44; product prepared by retrograde flotation of waste of non-mica production and of 0.63-0.00 mm in size, 7.45. EFFECT: improved quality. 1 tbl
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