EP0445143A1 - Device for chip washing - Google Patents

Device for chip washing

Info

Publication number
EP0445143A1
EP0445143A1 EP19890912677 EP89912677A EP0445143A1 EP 0445143 A1 EP0445143 A1 EP 0445143A1 EP 19890912677 EP19890912677 EP 19890912677 EP 89912677 A EP89912677 A EP 89912677A EP 0445143 A1 EP0445143 A1 EP 0445143A1
Authority
EP
European Patent Office
Prior art keywords
chute
tank
chips
outlet
inlet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19890912677
Other languages
German (de)
French (fr)
Inventor
R. Baltsar Lundgren
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valmet AB
Original Assignee
Sunds Defibrator Industries AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sunds Defibrator Industries AB filed Critical Sunds Defibrator Industries AB
Publication of EP0445143A1 publication Critical patent/EP0445143A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/02—Pretreatment of the raw materials by chemical or physical means
    • D21B1/023—Cleaning wood chips or other raw materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
    • B03B5/62—Washing granular, powdered or lumpy materials; Wet separating by hydraulic classifiers, e.g. of launder, tank, spiral or helical chute concentrator type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
    • B03B5/62—Washing granular, powdered or lumpy materials; Wet separating by hydraulic classifiers, e.g. of launder, tank, spiral or helical chute concentrator type
    • B03B5/626—Helical separators
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C1/00—Pretreatment of the finely-divided materials before digesting
    • D21C1/02—Pretreatment of the finely-divided materials before digesting with water or steam

Definitions

  • This invention relates to the washing of chips from wood material.
  • the manutacture pT pulp normally proceeds from wood material, which was chipped to small pieces, so-called chips. With these chips also follow along heavy impurit ⁇ ies (scrap) such as gravel,, metal pieces and the like. These impurities must be removed before the chips chem ⁇ ically or mechanically are disintegrated to pulp. This removal takes place in a so-called chip washer, which can be designed in different ways.
  • the washing of the chips usually is carried out in two steps.
  • the first step comprises the removal of heavy impurities in a container, in which chips and water are stirred by a rotor provided with blades, whereby the impurities sink to the bottom. Thereafter sand- and finer impurities are removed in a screw thickener. Between these steps the chips are collected in a tank, from which they are pumped to the second step.
  • This conventional equipment has its weakness, because at a smaller size and weight of the impurities the separ ⁇ ation is uncertain, due to the fact that the particles to te separated are not caused to move to some separation zone, but are stirred together with the chips.
  • the present invention offers a solution of the aforesaid problem.
  • a tank equipped with a screw-shaped chute for chips and water the impurities can be separated along a relatively long sedimentation path and simultan ⁇ eously be affected by the centrifugal force. Chips and water, besides, are discharged continuously while at the same time the impurities are concentrated and thereby their separation is facilitated.
  • the invention implies that the first separation step and the pump tank in a conventional arrangement can be replaced by a device, which can be connected directly to the subsequent thickener.
  • Pig. 1 is a section through a device according to the invention, and Pig. 2 is a section II-II of the same device as shown in Pig. 1.
  • This embodiment of the invention comprises a cylindric tank 1, the size of which, of course, depends on the desir ⁇ ed capacity.
  • the tank can have a diameter, for example, of 1,5-3 m.
  • a chute 2 which extends in the form of a screw slightly more than one turn about the tank wall. Por achieving a satisfactory separation effect, the length of the chute 2 in the tank should be at least half a turn. Preferably the length should be at least one turn.
  • An inlet 3 for chips and water is located upwardly in the tank 1 at the upper end of the chute 2.
  • the chute is outwardly defined by the tank wall and inwardly by an edge 4, the height of which decreases downward along the chute.
  • the chute bottom is inclined outward to the tank wall, which inclination increases along the chute.
  • the chute can be steeper at the beginning.
  • the chute In its first part, preferably in its first quarter, the chute can also be provided with unevennesses or steps in the bottom, while its subsequent part should be smooth.
  • a scrap outlet 5 is located at the end of the chute adjacent the tank wall.
  • Said scrap outlet preferably is designed for interval discharge, i.e. provided with two valves open ⁇ ing altematingly.
  • a water supply conduit 6 is.connected to the scrap outlet 5 in order to bring about a counterflow through the scrap outlet.
  • the bottom of the tank 1 is ishaped conically so as to slope down to a central outlet 7 for washed chips. About the outlet 7 possibly one or several additional annular scrap traps 8 can be arranged. In connection to these traps openings can be located for manual emptying.
  • the chips to be washed are supplied together with water through the inlet 1 down into the chute 2 and follow the chute downward. Heavy objects and particles are collected by sedimentation on the chute bottom.
  • the separation of scrap is increased by action of the centrifugal force and by the fact, that the chute bottom is inclined outward to the tank wall. Unevennesses in the bottom of the first part of the chute and a steeper inclination promote the scrap removal in this ⁇ part of the chute, while in the subsequent part of the chute sedimentation is desired.
  • the additional scrap traps 8 which can be arranged about the central outlet, are a safety at extreme scrap loads which in exceptional cases can arise. Such loads may, for example, occur when the chips are taken with a bottom scraping device of a chip bucket from a chip plane.
  • the invention is not restricted to the embodim ⁇ ent shown, but can be varied within the scope of the in ⁇ vention idea.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Detergent Compositions (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Abstract

Dispositif de lavage de copeaux comprenant un réservoir cylindrique (1) muni en son sommet d'une entrée pour les copeaux et l'eau, ladite entrée étant placée directement devant la glissière (2), qui descend en forme de vis d'au moins un demi-tour à l'intérieur du réservoir (1). Une glissière (2) est délimitée extérieurement par la paroi du réservoir et intérieurement par une bordure (4) dont la hauteur diminue du haut vers le bas de la glissière. Au bout de la glissière et adjacent à la paroi du réservoir se trouve une sortie de déchets (5). Le fond du réservoir s'incline vers une sortie centrale.Chip washing device comprising a cylindrical tank (1) provided at its top with an inlet for chips and water, said inlet being placed directly in front of the slide (2), which descends in the form of a screw at least half a turn inside the tank (1). A slide (2) is delimited externally by the wall of the tank and internally by an edge (4) whose height decreases from the top to the bottom of the slide. At the end of the slide and adjacent to the tank wall is a waste outlet (5). The bottom of the tank tilts towards a central outlet.

Description

Device' foi? chip washing
This invention relates to the washing of chips from wood material.
The manutacture pT pulp normally proceeds from wood material, which was chipped to small pieces, so-called chips. With these chips also follow along heavy impurit¬ ies (scrap) such as gravel,, metal pieces and the like. These impurities must be removed before the chips chem¬ ically or mechanically are disintegrated to pulp. This removal takes place in a so-called chip washer, which can be designed in different ways.
The washing of the chips usually is carried out in two steps. The first step comprises the removal of heavy impurities in a container, in which chips and water are stirred by a rotor provided with blades, whereby the impurities sink to the bottom. Thereafter sand- and finer impurities are removed in a screw thickener. Between these steps the chips are collected in a tank, from which they are pumped to the second step.
This conventional equipment has its weakness, because at a smaller size and weight of the impurities the separ¬ ation is uncertain, due to the fact that the particles to te separated are not caused to move to some separation zone, but are stirred together with the chips.
The present invention offers a solution of the aforesaid problem. By using a tank equipped with a screw-shaped chute for chips and water the impurities can be separated along a relatively long sedimentation path and simultan¬ eously be affected by the centrifugal force. Chips and water, besides, are discharged continuously while at the same time the impurities are concentrated and thereby their separation is facilitated.
The invention implies that the first separation step and the pump tank in a conventional arrangement can be replaced by a device, which can be connected directly to the subsequent thickener.
The characterizing features of the invention become appar¬ ent from the attached claims. The invention is described in greater detail.in the foll¬ owing, with reference to the accompanying drawing, in which
Pig. 1 is a section through a device according to the invention, and Pig. 2 is a section II-II of the same device as shown in Pig. 1.
This embodiment of the invention comprises a cylindric tank 1, the size of which, of course, depends on the desir¬ ed capacity. The tank can have a diameter, for example, of 1,5-3 m. In its interior the tank is provided with a chute 2, which extends in the form of a screw slightly more than one turn about the tank wall. Por achieving a satisfactory separation effect, the length of the chute 2 in the tank should be at least half a turn. Preferably the length should be at least one turn. An inlet 3 for chips and water is located upwardly in the tank 1 at the upper end of the chute 2. The chute is outwardly defined by the tank wall and inwardly by an edge 4, the height of which decreases downward along the chute. The chute bottom is inclined outward to the tank wall, which inclination increases along the chute. The chute can be steeper at the beginning. In its first part, preferably in its first quarter, the chute can also be provided with unevennesses or steps in the bottom, while its subsequent part should be smooth. At the end of the chute adjacent the tank wall, a scrap outlet 5 is located. Said scrap outlet preferably is designed for interval discharge, i.e. provided with two valves open¬ ing altematingly. A water supply conduit 6 is.connected to the scrap outlet 5 in order to bring about a counterflow through the scrap outlet. The bottom of the tank 1 is ishaped conically so as to slope down to a central outlet 7 for washed chips. About the outlet 7 possibly one or several additional annular scrap traps 8 can be arranged. In connection to these traps openings can be located for manual emptying.
The chips to be washed are supplied together with water through the inlet 1 down into the chute 2 and follow the chute downward. Heavy objects and particles are collected by sedimentation on the chute bottom. The separation of scrap is increased by action of the centrifugal force and by the fact, that the chute bottom is inclined outward to the tank wall. Unevennesses in the bottom of the first part of the chute and a steeper inclination promote the scrap removal in this^part of the chute, while in the subsequent part of the chute sedimentation is desired.
At the same time as the impurities are directed to the bottom of the chute and outward to the tank wall, an overflow of chips and water from the surface over the edge 4 takes place. This edge should have a continuously decrease ing height so dimensioned thai? only 30-50% of the incoming flow of chips and water remain? at the end of the chute. The impurities collected o the chute bottom adjacent the tank wall are removed through the scrap outlet 5. The counterflow through the conduit 6 should be 0,1-0,2 m/s. The flow of chips and water free of scrap is taken out through the outlet 7 and conveyed by means of a pump 9 to subsequent processing steps, which normally are thicken - ing steps.
The additional scrap traps 8, which can be arranged about the central outlet, are a safety at extreme scrap loads which in exceptional cases can arise. Such loads may, for example, occur when the chips are taken with a bottom scraping device of a chip bucket from a chip plane. The invention, of course, is not restricted to the embodim¬ ent shown, but can be varied within the scope of the in¬ vention idea.

Claims

Claims
1. A device for washing chips, comprising a cylindric tank (1), which upwardly is provided with an inlet (3) for chips and water and at its bottom with an outlet (7) for washed chips, c h a r a c t e r i z e d i n that a chute (2) extends in screw-shape downward at least half a turn along the inside of the tank from the inlet (3), that the chute is defined outwardly by the tank wall and inwardly. by an edge (4), the height of which decreases downward along the chute, that a scrap outlet (5) is located at the end of the chute adjacent the tank wall, and that the tank bottom slopes down to the outlet (7), which is located centrally.
2. A device as defined in claim 1, c h a r a c t e r ¬ i z e d i n that the bottom of the chute (2) is in- clined outward to the tank wall.
3. A device as defined in claim 2, c h a r a c t e r ¬ i z e d i n that the inclination increases along the chute.
4. A device as defined in any one of the preceding claims, c h a r a c t e r i z e d i n that the chute (2) is steeper at the beginning nearest the inlet (3).
5. A device as defined in any one of the preceding claims, c h a r a c e r i z e d i n that the first part of the chute (2), preferably the first quarter, at the bottom is provided with unevennesses or steps.
6. A device as defined in any one of the preceding claims, c h a r a c t e r i z e d i n that additional scrap traps (8) are arranged annularly about the central outlet (7).
EP19890912677 1988-11-25 1989-11-20 Device for chip washing Withdrawn EP0445143A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8804261 1988-11-25
SE8804261A SE462566B (en) 1988-11-25 1988-11-25 DEVICE FOR WASHING THE TIP

Publications (1)

Publication Number Publication Date
EP0445143A1 true EP0445143A1 (en) 1991-09-11

Family

ID=20374062

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890912677 Withdrawn EP0445143A1 (en) 1988-11-25 1989-11-20 Device for chip washing

Country Status (8)

Country Link
EP (1) EP0445143A1 (en)
JP (1) JPH04501891A (en)
AU (1) AU4522189A (en)
CA (1) CA2003768A1 (en)
FI (1) FI912523A0 (en)
NZ (1) NZ231500A (en)
SE (1) SE462566B (en)
WO (1) WO1990006394A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4857094B2 (en) * 2006-12-01 2012-01-18 前澤工業株式会社 Sand settling equipment
CN114180343A (en) * 2021-10-29 2022-03-15 淮北矿业股份有限公司 Method for improving ash conveying system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL153080B (en) * 1949-07-14 Gundernhausen Chemie PROCESS OF MANUFACTURING FLOOR COVERING MATERIAL AND FLOOR COVERING MATERIAL THEREFORE.
US3765532A (en) * 1971-07-12 1973-10-16 Rex Chainbelt Inc Wood chip washer
NZ207756A (en) * 1983-04-13 1986-01-24 Mineral Deposits Ltd Spiral separator:deflecting layer over concentrate layer

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9006394A1 *

Also Published As

Publication number Publication date
AU4522189A (en) 1990-06-26
SE462566B (en) 1990-07-16
WO1990006394A1 (en) 1990-06-14
NZ231500A (en) 1991-07-26
SE8804261A (en) 1988-11-25
CA2003768A1 (en) 1990-05-25
FI912523A0 (en) 1991-05-24
SE8804261D0 (en) 1988-11-25
JPH04501891A (en) 1992-04-02

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