FIELD: production of limestone in shaft furnaces. SUBSTANCE: the shaft furnace has a lined shaft, side ovens and a ceramic core. The ceramic core consists of partitions and central post provided with metal gas-cooled beams-locks. The central post and the shaft lining have grooves which receive the partitions that have a possibility of free temperature strains relative to the shaft lining and core central post. EFFECT: enhanced service life of the ceramic core. 2 dwg, 1 tbl
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