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    • 6. 发明公开
    • A METHOD AND INSTALLATION FOR RECYCLING FIBER CEMENT WASTE MATERIALS
    • EP4299544A1
    • 2024-01-03
    • EP22182068.1
    • 2022-06-29
    • Etex Services NV
    • MAREELS, JoyceWANTE, Steven
    • C04B20/02C04B28/02
    • The method and installation are capable of obtaining a cement powder having fiber concentrations in accordance with the above-cited requirements, i.e. below 2wt%. The method comprises providing millimetre-sized granules originating from waste fiber cement material. The granules are supplied to a roller/classifier mill (10) comprising a rotating horizontal grinding track (13) and one or more rollers (12) configured to rotate about stationary rotation axes so that the granules are ground between the grinding track (13) and a lateral surface of the rotors (12). The roller/classifier mill further comprises an air classifier (14) arranged above the one or more rotors.
      In the roller/classifier mill (10), the granules are reduced to micrometre-sized particles which are small enough to separate from the fibers. Said smaller-sized particles together with the cement-free fibers are separated from heavier particles in the air classifier (14) and removed from the mill by an upward air flow through an outlet (16). Following this, the smaller-sized particles are separated from the majority of the cement-free fibers in a sieve (20), and obtained as the end product, which is a cementitious powder with very low fiber concentration.