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WO1991001823A1 - Procede de traitement de boues residuaires de chaux - Google Patents

Procede de traitement de boues residuaires de chaux Download PDF

Info

Publication number
WO1991001823A1
WO1991001823A1 PCT/SE1990/000521 SE9000521W WO9101823A1 WO 1991001823 A1 WO1991001823 A1 WO 1991001823A1 SE 9000521 W SE9000521 W SE 9000521W WO 9101823 A1 WO9101823 A1 WO 9101823A1
Authority
WO
WIPO (PCT)
Prior art keywords
sludge
lime sludge
soot
residual lime
product
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.)
Ceased
Application number
PCT/SE1990/000521
Other languages
English (en)
Inventor
Bernt Fredin
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to FI920520A priority Critical patent/FI920520A0/fi
Publication of WO1991001823A1 publication Critical patent/WO1991001823A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
    • B09B3/30—Destroying solid waste or transforming solid waste into something useful or harmless involving mechanical treatment
    • B09B3/38—Stirring or kneading
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
    • C05F7/00—Fertilisers from waste water, sewage sludge, sea slime, ooze or similar masses
    • C05F7/02—Fertilisers from waste water, sewage sludge, sea slime, ooze or similar masses from sulfite liquor or other waste lyes from the manufacture of cellulose
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/26—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof
    • C02F2103/28—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof from the paper or cellulose industry

Definitions

  • the sulphate waste liquor or black liquor remaining after pulping is evaporated, yielding what is generally referred to as con ⁇ centrated waste liquor of a dry solids content of about 60-65%.
  • the concentrated waste liquor is burnt in a soda recovery boiler at a temperature of 700-1000°C to form a melt which is subsequently mixed with weak liquor in a melt dissolver, yielding green liquor.
  • the green liquor is conducted to what is generally called a green liquor clarifier, producing a clear green liquor and a viscous green liquor sludge.
  • This sludge mainly consists of com ⁇ bustion residues formed when burning the concentrated waste liquor in the soda recovery boiler, and weak liquor which can be recycled to the above-mentioned melt dissol- ver.
  • the green liquor sludge is passed through a filter with a pre-coat- ing of lime sludge which is taken in a small amount from the container where the green liquor is converted to white liquor by the addition of lime.
  • This filter which advan- tageously is a rotary filter, separates what is commonly referred to as black sludge or residual lime sludge.
  • this sludge contains, inter alia, sodium, calcium, and sulphur.
  • the sludge is a gluey and viscous mass of substantially semi-plastic con- sistency. In average pulp mills with a production capacity of some 100,000 tonnes of pulp per year, about 20 tonnes
  • the present invention aims at obviating the above- mentioned inconveniences linked with the handling of re ⁇ sidual lime sludge or black sludge in the recovery of chemicals in the cellulose industry, as well as creating opportunities for simple, expedient and environment- friendly handling thereof.
  • this is ' achieved by mixing the sludge with a drying agent in the form of soot in a mixing ratio, counted in units of volume, of 1:2-1:4, suitably 1:3, the soot absorbing liquid from the residual lime sludge and forming with the sludge a dry, particulate and/or granular mixed product.
  • the soot -obtained as a residual product in the combustion of waste liquors in the boiler house or a solid-fuel boiler can be advantageously used.
  • this soot is collected in an outdoor container which is emptied at regular intervals.
  • the soot is volatile and has a tendency to dust, and thus, like the residual lime sludge, constitutes an environmental hazard and poses considerable problems of handling.
  • SE Patent 78493 discloses a method for treating lime sludge by admixing a drying agent. This method is based on the assumption that the lime sludge is a practically use- less waste product entailing substantial costs and prob ⁇ lems when to be removed. Therefore, this prior art method aims at recovering the lime content of the sludge by burn- ing, after the sludge has been dried and formed into brick-like pieces suited for burning.
  • the lime sludge is dried, optionally by the addition of particular drying agents, e.g. pulverised coal or coke, peat or saw-dust (see the specification, p 2, col 1, ultimate lines). All these drying agents are combustible, i.e.
  • the present invention aims at solving a completely different problem than SE 78493, namely how to improve the handleability and transportability of the black sludge or residual lime sludge obtained when filtering green liquor sludge through a lime sludge layer. Furthermore, the solu- tion of the invention is essentially different from that of SE 78493 in that soot is a material having no intrinsic value since, unlike coal, coke, peat or saw-dust, it is a combustion product which cannot be further burnt. Thus, the invention does not aim at providing a combustible mixed product or a mixed product having an increased con ⁇ tent of lime to be recovered.
  • the object of the invention is to achieve, at minimum costs, expe ⁇ transient and simple handling of black sludge or residual lime sludge, and to this end nothing but soot is used, as explicity stated in the appended claim. More precisely, the soot is mixed with the black sludge in a mixing ratio, counted in units of volume, of 4:1-2:1, suitably 3:1.
  • the product obtained by the inventive method can be used and refined in different ways. Thus, it may be used as an earth filler. Since the mixture is markedly alkaline owing to its content of sodium and calcium, it is advantageously used on acid soils.
  • the product may be refined, e.g. by admixing small amounts of peat, bark, saw-dust or the like, for instance when it is to be used as an earth filler.

Landscapes

  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Water Supply & Treatment (AREA)
  • Treatment Of Sludge (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Abstract

On a traité des boues résiduaires de chaux ou des boues noires résiduaires par mélange d'un agent de séchage se présentant sous la forme de suie dans un rapport de mélange, exprimé en unités de volume, de 1:2 à 1:4, de préférence 1:3, la suie absorbant le liquide de la boue résiduaire de chaux et formant avec ladite boue un produit mélangé particulaire et/ou granulaire sec.
PCT/SE1990/000521 1989-08-08 1990-08-08 Procede de traitement de boues residuaires de chaux Ceased WO1991001823A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FI920520A FI920520A0 (fi) 1989-08-08 1990-08-08 Foerfarande foer behandling av restmesa.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8902690A SE466296B (sv) 1989-08-08 1989-08-08 Foerfarande vid behandling av restmesa, erhaallen vid aatervinning av kokkemikalier inom cellulosaindustrin
SE8902690-0 1989-08-08

Publications (1)

Publication Number Publication Date
WO1991001823A1 true WO1991001823A1 (fr) 1991-02-21

Family

ID=20376645

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1990/000521 Ceased WO1991001823A1 (fr) 1989-08-08 1990-08-08 Procede de traitement de boues residuaires de chaux

Country Status (5)

Country Link
AU (1) AU6155990A (fr)
CA (1) CA2060187A1 (fr)
FI (1) FI920520A0 (fr)
SE (1) SE466296B (fr)
WO (1) WO1991001823A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009083333A1 (fr) * 2007-12-21 2009-07-09 Fels-Werke Gmbh Procédé pour la production de chaux hydraulique

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE78493C1 (fr) *
DE3620814C2 (fr) * 1986-06-21 1988-08-25 Saarbergwerke Ag, 6600 Saarbruecken, De

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE78493C1 (fr) *
DE3620814C2 (fr) * 1986-06-21 1988-08-25 Saarbergwerke Ag, 6600 Saarbruecken, De

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
TAPPI JOURNAL, Vol. 66, No. 7, July 1983, G.G. SIMPSON et al., "Paper Mill Sludges, Coal Fly Ash, and Surplus Lime Mud as Soil Amendments in Crop Production", see page 71 - page 74. *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009083333A1 (fr) * 2007-12-21 2009-07-09 Fels-Werke Gmbh Procédé pour la production de chaux hydraulique

Also Published As

Publication number Publication date
FI920520A7 (fi) 1992-02-07
SE466296B (sv) 1992-01-27
SE8902690L (sv) 1991-02-09
SE8902690D0 (sv) 1989-08-08
AU6155990A (en) 1991-03-11
FI920520A0 (fi) 1992-02-07
CA2060187A1 (fr) 1991-02-09

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