FIELD: manufacture of building materials. SUBSTANCE: invention relates to production of cement clinker in long rotary kiln by feeding lime-containing charge into charge side of kiln whereto steel slag with particle diameter up to 2 inch is also fed. Slag can be fed separately or having been preliminarily mixed with charge. Kilns can be operated both in wet or dry mode. EFFECT: enabled utilization of coarse steel slag resulting in lower power consumption and better environmental condition. 9 cl, 5 tbl
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