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    • 2. 发明公开
    • METHOD AND DEVICE FOR CARBONATION
    • EP4059905A1
    • 2022-09-21
    • EP21163464.7
    • 2021-03-18
    • HeidelbergCement AG
    • ZAJAC, MaciejPATO, NicolasSKOCEK, Jan
    • C04B18/06C04B22/06B03B5/32B04B1/10C04B20/02
    • Method for converting a starting material containing at least 40 wt.-% of calcium silicon (hydr)oxide phases and calcium aluminium (hydr)oxide phases into an SiO 2 rich SCM and a calcium carbonate additive comprising the steps
      - providing the starting material with a D 90 of ≤ 1 mm
      - mixing the starting material with water or adjusting the water content to provide a starting material slurry having a solid:liquid weight ratio from 2:1 to 1:100
      - passing the starting material slurry together with carbon dioxide into a gravity separation reactor
      - subjecting the starting material slurry and carbon dioxide to centrifugal motion inside the reactor and
      - removing a heavy slurry of higher density particles comprising the calcium carbonate additive formed by reaction of carbon dioxide with calcium ions dissolved or leached from the starting material from a first outlet of the reactor, removing a light slurry of lower density particles comprising the undissolved SiO 2 rich remains of the starting material from a second outlet of the reactor, and removing liquid at a third outlet of the reactor,
      and gravity separation reactor comprising an inlet (11) for a slurry (a) and an inlet (12) for carbon dioxide (b) or an inlet (11) for a slurry (c) premixed with carbon dioxide, a reaction chamber (13) adapted to subject the introduced slurry (a, c) to centrifugal motion, a first outlet (14) for a heavy slurry (d) of higher density particles, a second outlet (15) for a light slurry (e) of lower density particles and a third outlet (16) for liquid (f).