FIELD: manufacture of building materials. SUBSTANCE: raw material is prepared by post-blending it to eutectic composition of CaO- MgO system utilizing calcium oxide-containing additive in amount m = 203[1-0.015m(CaO)] x where m(CaO) is percentage of CaO in starting dolomite and x is correction factor for addition of CaO in the form of calcium hydroxide, calcium salt or chalk per 100 g of dolomite. Baking is carried out at temperature no higher than 1700 C. EFFECT: lowered sintering temperature and therefore baking expenses. 3 tbl
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