FIELD: building materials industry. SUBSTANCE: claimed process for preparing raw material mix comprises hydroclasifying belite containing slurry to 0.08-0.25 mm fractions, washing the recovered coarser part of slime individually in dense-flowing layer at liquid to solid ratio of 1.0-1.5 and layer height to its diameter ratio of 6:1 and directing it for preparing cement raw mix. The claimed process makes it possible to reduce content of alkalis to 0.6% in cement raw mix, thus making cement more active. EFFECT: improved properties of the raw mix.
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