Method and installation for producing lime or dolime

(22) 10.05.2022

(43) 17.11.2022

(57) Method and installation for producing lime or dolime, comprising a calcination of calcareous or dolomitic material in contact with first fumes obtained by combustion of fuel with an oxidizing gas, a cooling of calcined lime or dolime with discharge and collect thereof and a release of a gaseous effluent containing CO₂, said method further comprising a CO₂ depletion of said gaseous effluent by passing it through a sorbent material based on CaO which captures CO₂ and forms a CaCO₃-CaO based charge, a separation between the CaCO₃-CaO based charge and the CO₂-depleted gaseous effluent, which is removed, a calcination of the separated CaCO₃-CaO based charge in contact with second fumes obtained by combustion of a fuel poor in impurities with an oxidizing gas comprised of dioxygen and CO₂, with, formation of said CaO-based sorbent material, a separation between the CaO-based sorbent material and a CO₂-concentrated gas stream which is collected, a recycling of said separated CaO-based sorbent material into the CO₂ depletion step and an extraction of a valorizable fraction of the CaCO₃-CaO based charge with a compensatory introduction of fresh CaCO₃ (29) in the calcination step.

(71) S.A. Lhoist Recherche et Developpement (BE)