Method and a system for separating an aqueous suspension containing fibrous particles into fractions of different average characteristics

A system for separating an aqueous suspension containing fibrous particles into fractions of different average characteristics with respect to particle size and shape, comprising

• a chamber having tubular inlet means for feeding said suspension,
• a separator disc having a concave surface on the underside of said disc and arranged for rotation in a substantially horizontal plane in the upper part of said chamber to receive said suspension from said inlet means, said separator disc having a diameter greater than that of said inlet means and sloping downwardly from a central portion of the disc towards the circumference thereof,
• means for rotating said separator disc at a circumference velocity sufficiently great that a film of said suspension formed on the underside of the disc is accelerated towards the disc circumference in a continuous flow, in which fractions of the suspension having said different average characteristics are separated from each other and at the circumference of the disc said film is broken up and separated fractions dispersed outwardly from the disc in different directions in a dense mist of particles and atomized water droplets in air, and
• collecting means arranged in a number of collecting zones disposed in said chamber in different vertical positions to receive said separated fractions.

A system for separating aqueous suspension containing fibruos particles into fractions of different average characteristics with respect to particle size and shape, comprising

• a chamber having tubular inlet means for feeding said suspension,
• a separator disc having a concave surface formed on the underside thereof and arranged for rotation in a substantially horizontal plane in the upper part of said chamber to receive said suspension from said inlet means, said separator disc having a diameter greater than that of said inlet means,
• means for rotating said separator disc,
• said rotating means imparting a circumferential velocity to said separator disc so that a film of said suspension supplied through said inlet means forms on said concave surface and is accelerated by centrifugal forces in a continuous flow with fractions of the suspension having said different average characteristics separated from each other towards the circumference of the disc and broken up at said disc circumference to thereby disperse separated fractions outwardly from the disc in different directions in a dense mist of particles and atomized water droplets in air, and
• collecting means arranged in a number of collecting zones disposed in said chamber in different vertical positions to receive said separated fractions.

A system for separating aqueous suspension containing fibrous particles into fractions of different average characteristics with respect to particle size and shape, comprising

• a chamber having tubular inlet means for feeding said suspension,
• a separator disc having a concave surface, a flat central portion arranged for rotation in a horizontal plane, and a circumferential portion formed integral with said central portion and sloping downwardly therefrom under an acute angle to said rotational plane, said disc arranged for rotation in a substantially horizontal plane in the upper part of said chamber to receive said suspension from said inlet means, said separator disc having a diameter greater than that of said inlet means,
• means for rotating said separator disc,
• said rotating means imparting a circumferential velocity to said separator disc so that a film of said suspension supplied through said inlet means forms on said concave surface and is accelerated by centrifugal forces in a continuous flow with fractions of the suspension having said different average characteristics separated from each other towards the circumference of the disc and broken up at said disc circumference to thereby disperse separated fractions outwardly from the disc in different directions in a dense mist of particles and atomized water droplets in air, and
• collecting means arranged in a number of collecting zones disposed in said chamber in different vertical positions to receive said separated fractions.