Method and device for the separation of particles
AssigneeTechnische Universiteit Delft
InventorsPeter Carlo Rem, Laurens Anton Van Kooy
Life of this patent
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Abstract
The invention relates to a method of separating a particle fraction from a particle stream making use of gravitational force and which is performed in a fluid. This provides particle fractions that are collected in respective collecting means. According to the invention the fluid and the collecting means are moved in relation to each other defining a relative direction of movement. There are means provided to limit the movement of the particles to be separated with respect to the fluid in the relative direction of movement. The invention also relates to an apparatus for carrying out the method.
Claims16
A method of separating a particle fraction from a particle stream, comprising the steps of:
- providing an apparatus for the separation of particles, which comprises a vessel filled with an aqueous solution and provided with baffles radiating from a shaft placed concentrically in the vessel and connected to a circular wall that co-rotates with the baffles in order to limit the turbulence in the water, and at least two collecting means for the separated particles, which collecting means have their own discharge means;
- moving the baffles so as to impart a movement to the aqueous solution;
- and
- introducing bottom ash from a waste incineration plant into the apparatus, which bottom ash is moved by the aqueous solution in the apparatus in a substantially horizontal direction defining a relative direction of movement for separation of the bottom ash under the influence of gravitational force into a light fraction, and into a heavy fraction comprising more than 90% nonferrous metal.
A method of separating a particle fraction from a particle stream, wherein the particles of the particle stream are separated in a fluid in a container under the influence of gravitational force based on difference in vertical velocity, the method comprising the steps of:
- moving the fluid and the particles in a substantially horizontal direction defining a relative direction of movement;
- collecting a first particle fraction at a first location in a respective collecting means;
- collecting, at a second location somewhat removed from the first location, a second particle fraction in respective collecting means;
- and
- moving the fluid in the relative direction of movement,
- wherein the particle stream is bottom ash from a waste incineration plant and is separated into a light fraction, and into a heavy fraction comprising more than 90% nonferrous metal, and
- wherein the introduction into the fluid occurs in a particle size-dependent manner at different locations along the relative path of movement, such that the larger particles are the closest to the collecting means.
An apparatus for the separation of particles, comprising:
- a vessel filled with an aqueous solution and provided with baffles radiating from a shaft placed concentrically in the vessel connected to a circular wall that co-rotates with the baffles in order to limit the turbulence in the water;
- at least two collecting means for the separated particles, the collecting means being provided in the vessel and having their own discharge means;
- means for moving the baffles so as to impart a substantially horizontal movement to the aqueous solution;
- means for introducing bottom ash from a waste incineration plant into the apparatus, the bottom ash being moved in use by the movement of the aqueous solution in a substantially horizontal direction, defining a relative direction of movement for separating the bottom ash under the influence of gravitational force into a light fraction, and a heavy fraction comprising more than 90% heavy metal.
Dependencies are inferred from the claim text.