Method and apparatus for treating filler-containing material, such as recycled fibers
AssigneeAndritz Inc.
InventorPentti Vikiö
Life of this patent
Estimating the term…
Abstract
Recycled fiber pulp from a vortex cleaning plant (e.g. connected to the short circulation of a paper machine) effects the recovery and return of fillers in the recycled fiber pulp discharged from the vortex cleaning plant, in an efficient and economical manner. The loss of filler in the recycled fiber pulp discharged from the vortex cleaning plant is decreased by treating a concentrated fraction of the rejects from the vortex cleaning plant with a mixer/disperser for dispersing the filler in the recycled fiber pulp, and returning as much usable filler as possible back to the process.
Claims36
A method of treating filler-containing material utilizing a vortex cleaning plant having a plurality of steps including a last step, and utilizing a first fractionation stage and a last fractionation stage distinct from the vortex cleaning plant, said method comprising the steps of:
- (a) passing filler-containing material to the vortex cleaning plant including the last step thereof in which the material is divided into a first, finer, fraction and a second, coarser, fraction;
- (b) passing the second fraction to the first fractionation stage to divide the second fraction into a third, fine, fraction, and a fourth, coarse, fraction;
- (c) returning the third fraction to the vortex cleaning plant;
- (d) dispersing the fourth fraction to produce dispersed material;
- (e) passing the dispersed material to the last fractionation stage;
- (f) in the last fractionation stage, dividing the dispersed material into a fifth, fine fraction and a sixth fraction;
- and
- (g) returning the fifth fraction to the vortex cleaning plant, or to be treated again in steps (b) or (e).
A method of treating recycled fiber pulp containing filler comprising the steps of:
- (a) passing the recycled pulp containing filler to a vortex cleaning plant having a plurality of steps including first and last steps;
- (b) in the last step of the vortex cleaning plant dividing the pulp into a first finer fraction, and a second, coarser fraction;
- (c) returning the first fraction to the vortex cleaning plant;
- (d) screening the second fraction in a first screening stage to separate the recycled fiber pulp into a third fraction containing shives and other wood-based material, and a fourth fraction containing filler material;
- (e) passing the fourth fraction to a second screening stage in which the fourth fraction is divided into a fifth, fine material, fraction and a sixth, coarse material, fraction;
- and
- (f) dispersing the sixth fraction in a dispersion stage.
Apparatus for treating filler-containing material comprising:
- a vortex cleaning plant including a first treatment stage and a last treatment stage, said last treatment stage comprising a fractionation stage producing a reject material including filler-containing material;
- further treatment apparatus connected to said vortex cleaning plant for treating the reject material therefrom, said treatment apparatus comprising at least one dispersing device for breaking the filler-containing material into smaller particles;
- a pump and a first fractionation device between said at least one dispersing device and said vortex cleaning plant;
- and a pump and a second fractionation device on the opposite side of said at least one dispersing device from said first fractionation device;
- and
- means for returning filler material broken into smaller particles to said vortex cleaning plant.
Apparatus for treating filler-containing material comprising:
- a vortex cleaning plant including a first treatment stage and a last treatment stage, said last treatment stage comprising a fractionation stage producing a reject material;
- and
- further treatment apparatus connected to said vortex cleaning plant for treating the reject material therefrom, said treatment apparatus comprising at least one mixing/dispersing device, said further treatment apparatus comprising a first fractionation device connected between said vortex cleaning plant and said at least one mixing/dispersing device, and a second fractionating device disposed on the opposite side of said at least one mixing/dispersing device from said first fractionation device.
Apparatus for treating filler-containing material comprising:
- a vortex cleaning plant including a first treatment stage and a last treatment stage, said last treatment stage comprising a fractionation stage producing a reject material including filler-containing material;
- further treatment apparatus connected to said vortex cleaning plant for treating the reject material therefrom, said treatment apparatus comprising first and second dispersing devices for breaking the filler-containing material into smaller particles;
- a pump and a first fractionation device connected between said vortex cleaning plant and said first and second dispersing devices;
- and a pump and a second fractionation device connected on the opposite side of said first and second dispersing devices from said first fractionation apparatus;
- and
- means for returning filler material broken into smaller particles to said vortex cleaning plant.
A method of treating filler-containing material in a production process utilizing a vortex cleaning plant, the vortex cleaning plant having a plurality of steps including a predetermined step, and utilizing a first fractionation stage, a mixing/dispersion stage, and a second fractionation stage operatively associated with the vortex cleaning plant, said method comprising the steps of
- (a) passing filler-containing material to the vortex cleaning plant including the predetermined step thereof in which predetermined step the material is divided into a first, finer, fraction and a second, coarser filler rich fraction containing filler material;
- (b) passing the second filler rich fraction to the first fractionation stage to divide the second fraction into a third, fine, fraction, and a fourth, coarse filler rich fraction;
- (c) returning the third, fine, fraction to an earlier point in the production process;
- (d) dispersing the fourth coarse filler rich fraction in the mixing/dispersion stage to produce dispersed filler rich material;
- (e) passing the dispersed filler rich material from the mixing/dispersion stage to the second fractionation stage;
- (f) in the second fractionation stage, dividing the dispersed filler rich material into a fifth, fine fraction and a sixth coarse fraction;
- and
- (g) returning the fifth fine fraction to an earlier point in the production process.
A method of treating filler-containing material in a production process utilizing a vortex cleaning plant, the vortex cleaning plant having a plurality of steps including a predetermined step, and utilizing a mixing/dispersing stage and a fractionation stage which are operatively associated with the vortex cleaning plant, said method comprising the steps of:
- (a) passing filler-containing material to the vortex cleaning plant including the predetermined step thereof in which predetermined step the material is divided into a first, finer, fraction and a second, coarser filler rich fraction;
- (b) dispersing the second, coarser filler rich fraction in the mixing/dispersing stage to produce dispersed filler rich material;
- (c) passing the dispersed filler rich material to the fractionation stage;
- (d) in the fractionation stage, dividing the dispersed filler rich material into a third, fine fraction and a fourth coarser fraction;
- and
- (e) returning the third fine fraction to an earlier point in the production process.
A method of treating filler-containing material utilizing a vortex cleaning plant, the vortex cleaning plant having a plurality of steps including a step producing a coarse output, and utilizing a mixing/dispersing stage and a fractionation stage operatively associated with the vortex cleaning plant, said method comprising the steps of:
- (a) passing filler-containing material to the vortex cleaning plant including the step producing a course filler rich output such that the coarse filler rich output is divided into a first, finer, fraction and a second, coarser filler rich fraction;
- (b) dispersing, in the mixing/dispersing stage the second coarser filler rich fraction to produce dispersed filler rich material;
- (c) passing the dispersed filler rich material to the first fractionation stage;
- (d) in the first fractionation stage, dividing the dispersed filler rich material into a third, fine fraction and a fourth coarser fraction;
- and
- (e) returning the third, fine fraction to a point in the vortex cleaning plant upstream of the vortex step having the coarse output.
Apparatus for treating filler-containing material comprising:
- a vortex cleaning plant containing the filler-containing material, said vortex cleaning plant having a plurality of stages and producing a reject filler-rich material, and further treatment apparatus operatively associated with said vortex cleaning plant for treating the reject material therefrom, said further treatment apparatus comprising:
- at least one mixing/dispersing device for dispersing the reject filler-rich material;
- a first fractionation device operatively associated with said vortex cleaning plant and upstream of said at least one mixing/dispersing device, wherein said first fractionation device is separate from said mixing/dispersing device, and
- a second fractionating device disposed on an opposite side of said at least one mixing/dispersing device from said first fractionation device.
Dependencies are inferred from the claim text.