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Abstract

The present invention describes a process for decarbonation of carbonate materials, in particular limestone and dolomitic limestone, with CO₂ recovery in a multi-axis vertical kiln (MSVK) comprising a first, a second and, optionally, a third shaft with zones of preheating, heating and cooling and a crossing channel between each shaft, which alternately heats carbonated materials by combustion of at least one fuel with at least one oxidizer, up to a temperature range in which carbon dioxide is released from the carbonated materials , fuel combustion and decarbonation generate an exhaust gas, the decarbonated materials are cooled in the cooling zones with one or more cooling streams, in which mixing between the exhaust gas and one or more cooling streams is minimized. cooling by operating said furnace in a mode in which between two subsequent alternating heating cycles between the first and the second or the third shaft, the decarbonated materials in at least the first, the second and / or the third shaft are cooled with one or more cooling streams while the fuel supply to each axle is stopped.

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First Claim

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