FIELD: construction.
SUBSTANCE: cement production method involves drying of sedimentary silicic rock, its mixing and crushing with Portland cement clinker and gypsum; the above drying process is performed at the temperature of 350 - 400°C, and as the above sedimentary silicic rock there used is diatomite of llyinskoye Minefield, which contains the following in terms of a dry substance, wt %: silicon dioxide 72.0 - 75.0; aluminium oxide 10.5 - 12.0; calcium oxide 0.5 - 0.6; iron oxide 5.0 - 5.5; magnesium oxide 0.3 - 0.6; titanium oxide 0.71 - 0.75; impurities are the rest.
EFFECT: increasing strength of light-weight oil-well cement.
1 tbl
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