Patent ID: 7300007
Filing Date: 2007-11-27
Classification: B02C,B07B

Abstract:
1. A circulating grinding plant for a grinding of raw material, comprising a high-pressure roller mill or roller press providing product bed comminution of the raw material and having a sifter device, further comprising a static cascade sifter provided with sifting air flow flowing from an inlet side to sifting air current side, at least one additional sifter positioned on the sifting air current side, said additional sifter having an oversize material discharge connected to a material feed of the roller press, the static cascade sifter being disposed beneath a gap of the roller press, the subsequent sifter having a coarse grain discharge pipe being disposed above the roller press, a sifting material discharge area of the static cascade sifter being connected to one of a sifting air and a sifting product inlet of the subsequent sifter via an ascending duct provided with an airflow arranged to pneumatically convey the product.