WO1997022752A1 - Process for filtering white liquor and a storage container for lime sludge - Google Patents
Process for filtering white liquor and a storage container for lime sludge Download PDFInfo
- Publication number
- WO1997022752A1 WO1997022752A1 PCT/FI1996/000676 FI9600676W WO9722752A1 WO 1997022752 A1 WO1997022752 A1 WO 1997022752A1 FI 9600676 W FI9600676 W FI 9600676W WO 9722752 A1 WO9722752 A1 WO 9722752A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- iiquor
- lime
- green
- lime mud
- causticizing
- Prior art date
Links
Classifications
-
- 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
- D21C11/00—Regeneration of pulp liquors or effluent waste waters
- D21C11/0064—Aspects concerning the production and the treatment of green and white liquors, e.g. causticizing green liquor
- D21C11/0078—Treatment of green or white liquors with other means or other compounds than gases, e.g. in order to separate solid compounds such as sodium chloride and carbonate from these liquors; Further treatment of these compounds
-
- 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
- D21C11/00—Regeneration of pulp liquors or effluent waste waters
- D21C11/0064—Aspects concerning the production and the treatment of green and white liquors, e.g. causticizing green liquor
-
- 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
- D21C11/00—Regeneration of pulp liquors or effluent waste waters
- D21C11/04—Regeneration of pulp liquors or effluent waste waters of alkali lye
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/40—Production or processing of lime, e.g. limestone regeneration of lime in pulp and sugar mills
Definitions
- the present invention relates to a method of producing white Iiquor by dissolving chemical smelt obtained from evaporating and burning of black Iiquor, by causticizing the green liquor formed in the dissolution, by separating lime mud (calcium carbonate) and burning it to lime (caicium oxide) to be used in causticizing of green liquor
- the method of the invention is characterized in that a) before causticizing suspended solids are directly removed from green iiquor by pressure filtration to get green Iiquor with a suspended solids i e dregs content of less than 20 mg/l, b) lime mud (calcium carbonate) is separated directly by pressure filtration while the lime mud cake is simultaneously washed and dried to pro ⁇ quiz a lime mud product with a dry soiids content of 75-85% by weight and c) the lime mud product is led to a storage silo from where it is dis- charged and fed as an even flow to a lime kiln and
- a method of separating white liquor and lime mud, and green Iiquor and green Iiquor slurry, in two steps is known for example from publication Fl 87,347
- the lime mud containing white Iiquor obtained in the first step, and correspondingly the green liquor slurry, is diluted with water and possibly stored and in the second filtering step pure iime mud and correspondingly relatively dry green Iiquor waste is obtained, and quite large amounts of weak Iiquor
- Publication Fl 923, 127 discloses a method of filtering the causticiz ⁇ ing product and of increasing the dry solids content of the separated suspen ⁇ sion the separation of white iiquor and the washing and drying of the lime mud usually taking place in one process step
- a pressure filter is preferably used as filter the time mud dry solids content after filtration being high, about 75%
- the lime mud can then be dried by e g pressurized air No mention is made whether tne resulting lime mud can be stored or if it can be transferred to a kiln as an even flow
- the invention also relates to a storage silo for a lime mud product applicable to the method of the invention
- Figure 1 shows the process steps of the method of the invention
- Figure 2 shows filtration and washing steps in a pressure filter ap ⁇ plicable to the method of the invention
- Figure 3 shows a lime mud storage silo applicable to the method of the invention
- numeral 35 refers to a take-off line for feeding smelt to a smelt dissolver 1 from a recovery unit (not shown)
- the smelt dissolver for producing green Iiquor comprises an agitator 2
- a line 27 for weak Iiquor also ends in the smelt dissolver
- a line 3 for thick green Iiquor leads from the smelt dissolver to an equalizing tank 4 for green Iiquor feed, from where green Iiquor is fed by means of a pumping system 6 automatically to an intermittently oper- ating pressure filter 8
- a conveyor 36 for lime mud or burnt lime ends in the equalizing tank 4 and can be employed to add lime mud or burnt lime used as additive in the filtration.
- the pressure filter 8 separates sus ⁇ pended soiids, i.e. dregs 37, from green Iiquor.
- Filtrated clarified green Iiquor is conveyed via a line 10 to an air separator 11 for green Iiquor, from where the green Iiquor is then led via a line 12 to a storage tank 13 for green Iiquor From the storage tank the green Iiquor is led via a line 14 to a iime slaker 15.
- the green Iiquor dregs in the filter 8 are dried by diaphragm pressing and air Air is separated from clarified green Iiquor by the air separator 11.
- An alternative is to add burnt iime or lime mud to green Iiquor via the conveyor 36 to the equalizing tank 4 Adding burnt lime or lime mud con- tributes to the filtration and adds to filtrate capacity, which can also be influ ⁇ enced by changing the feeding pressure of green Iiquor.
- Lime milk is con ⁇ veyed from the causticizing tank by means of a pumping system 19 via a line 18 to a pressure filter 21 which separates white Iiquor and iime mud
- Filtered white Iiquor flows via a line 22 to a digester (not shown)
- weak iiquor is led via a line 23 to an air separator 24 where air is separated from weak iiquor and weak Iiquor is led via a line 25 to a weak iiquor tank 26, and then via a line 27 to the smelt dissolver 2.
- the lime mud that was separated, air dried and washed with water in the pressure filter 21 is led by a conveyor 28 to a lime mud silo 29 from where the lime mud is dis ⁇ charged and fed by a conveyor 30 as an even flow to the inlet of a iime kiln 31
- the residual alkali of the lime mud separated in the filter can be adjusted.
- the burnt lime is conveyed from the lime kiln via a conveyor 32 to a iime silo 33 and from there the burnt lime is fed via a line or a conveyor 34 to the lime slaker 15.
- FIG. 2 shows the principle of a pressure filter applicable to a method of the invention in different steps
- step 1 slurry is fed via a distribu- tor line and feeding lines to the chambers of a closed and sealed filter plate pack, whereby the solids gather on the filter cloth forming a cake
- the filtrate penetrates the cloth and flows to the filtrate space and from there via a tube in the plate to the collector line at the discharge side
- Diaphragm pressing is used in filtering green Iiquor but not in filtering white Iiquor
- the filtrate remaining in the chambers is pressed by means of chamber dia- phragms and pressure through the cloth to the filtrate side by leading pressing water through the tubes in the plates and the bottom plates to a space above the rubber diaphragms
- An alternative to diaphragm pressing is air drying which can be used to replace the first diaphragm pressing in step 2 and to eliminate the second diaphragm pressing in step 4
- Air drying is used as an alternative in filtering lime mud
- step 3 the cake remaining on the cloth is washed with water whereby the water lifts the press diaphragms against the chamber plates, and the wash filtrate penetrates the filtrate side of the cake and the cloth to the collector line Wash water is fed to the filter chambers via the same dist ⁇ butor line as the slurry
- the dregs cake formed in filtering green Iiquor is not washed, whereas the lime mud cake formed in white iiquor filtration is washed with warm water
- step 4 the washing liquid remaining in the cake is pressed from it by a second diaphragm pressing to the filtrate side and is led to the air sepa- rator of the weak Iiquor tank
- the second diaphragm pressing is similar to the first one After the second diaphragm pressing, in stage 5, the cake is dried with pressure air coming from the distributor line When air fills the chambers, it lifts the pressing diaphragms up and the water in the
- a storage silo for lime mud product consists of an upper part and a discharge part below it
- the properties of the lime mud product determine the length and breadth of the upper part
- the longitudinal walls of the upper part open downwards at an 1 -2E angle and the upper part is thermally insulated
- the longitudinal walls of the discharge part open upwards advantageously at a 15-30E angle for the normal pressure of the lime mud load not to disturb the operation of the discharger
- the wall (spout) of the discharge end of the dis ⁇ charge part opens downwards at a 30-60E angle
- the discharge opening in the spout is arched at spout level
- the other end of the discharge part is closed
- the lower part is overlaid with an antiadhesive coating determined by the properties of the lime mud product, suitable coatings include epoxy resm and polyfluoroethylene
- suitable coatings include epoxy resm and polyfluoroethylene
- the wall angles of the discharge part are rounded
- the lime mud storage operates continuously and iime mud can be discharged at a desired even flow from the silo by using the right discharger If needed the discharge of lime mud storage can be interrupted even with full storage and lime mud discharge can be resumed even after several days
Landscapes
- Paper (AREA)
- Treatment Of Sludge (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002240861A CA2240861C (en) | 1995-12-20 | 1996-12-19 | A storage silo for lime mud product |
SE9802196A SE523619C2 (en) | 1995-12-20 | 1998-06-18 | Storage container for mesa |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI956153A FI105933B (en) | 1995-12-20 | 1995-12-20 | A process for preparing white liquor |
FI956153 | 1995-12-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997022752A1 true WO1997022752A1 (en) | 1997-06-26 |
Family
ID=8544580
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FI1996/000676 WO1997022752A1 (en) | 1995-12-20 | 1996-12-19 | Process for filtering white liquor and a storage container for lime sludge |
Country Status (3)
Country | Link |
---|---|
FI (1) | FI105933B (en) |
SE (1) | SE523619C2 (en) |
WO (1) | WO1997022752A1 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009072978A1 (en) | 2007-12-06 | 2009-06-11 | Metso Fiber Karlstad Ab | System for reception and transport of lime mud from a white liquor filter |
WO2014131067A1 (en) * | 2013-02-26 | 2014-09-04 | Mondi Ag | Process for recausticizing green liquor |
EP2773812A1 (en) * | 2011-11-04 | 2014-09-10 | Valmet AB | Method for the causticizing process for producing white liquor |
EP3280841A4 (en) * | 2015-04-09 | 2018-08-29 | Valmet AB | Method for polysulfide production in a kraft pulp mill |
SE541168C2 (en) * | 2017-01-20 | 2019-04-23 | Valmet Technologies Oy | Method and system of thermal recovery relating to the operation of a dissolver of a chemical recovery boiler |
CN114229248A (en) * | 2021-11-19 | 2022-03-25 | 山东润德生物科技有限公司 | Be suitable for storage device of storage glucosamine sulfate |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11718559B2 (en) * | 2019-03-15 | 2023-08-08 | Gpcp Ip Holdings Llc | Closed loop control with camera detection of pebble size of lime particles to ameliorate lime kiln ringing and improve uptime and operating efficiency |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3216626A (en) * | 1962-01-09 | 1965-11-09 | Anciens Ets Leon Gaucet | Vibrating exhauster for silos |
US4388197A (en) * | 1980-05-29 | 1983-06-14 | Enso-Gutzeit Oy | Procedure for separating finely divided matter from a suspension by filtering |
FR2538424A1 (en) * | 1982-12-28 | 1984-06-29 | Larox Ag | Process for the treatment of the residual lime slurry formed during the causticisation reaction in a sulphate cellulose plant |
US4471891A (en) * | 1982-04-16 | 1984-09-18 | General Kinematics Corporation | Uniform material discharge apparatus |
EP0338579A2 (en) * | 1988-04-22 | 1989-10-25 | Vasipari és Gépjármüjavito Szövetkezet | Vibrating hopper for discharging bulk materials with a variable consistency |
WO1994001617A1 (en) * | 1992-07-07 | 1994-01-20 | Larox Oy | Method for filtering a product formed in causticization |
-
1995
- 1995-12-20 FI FI956153A patent/FI105933B/en not_active IP Right Cessation
-
1996
- 1996-12-19 WO PCT/FI1996/000676 patent/WO1997022752A1/en active Application Filing
-
1998
- 1998-06-18 SE SE9802196A patent/SE523619C2/en not_active IP Right Cessation
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3216626A (en) * | 1962-01-09 | 1965-11-09 | Anciens Ets Leon Gaucet | Vibrating exhauster for silos |
US4388197A (en) * | 1980-05-29 | 1983-06-14 | Enso-Gutzeit Oy | Procedure for separating finely divided matter from a suspension by filtering |
US4471891A (en) * | 1982-04-16 | 1984-09-18 | General Kinematics Corporation | Uniform material discharge apparatus |
FR2538424A1 (en) * | 1982-12-28 | 1984-06-29 | Larox Ag | Process for the treatment of the residual lime slurry formed during the causticisation reaction in a sulphate cellulose plant |
EP0338579A2 (en) * | 1988-04-22 | 1989-10-25 | Vasipari és Gépjármüjavito Szövetkezet | Vibrating hopper for discharging bulk materials with a variable consistency |
WO1994001617A1 (en) * | 1992-07-07 | 1994-01-20 | Larox Oy | Method for filtering a product formed in causticization |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009072980A1 (en) | 2007-12-06 | 2009-06-11 | Metso Fiber Karlstad Ab | Hose valve for feeding fine grained material |
WO2009072978A1 (en) | 2007-12-06 | 2009-06-11 | Metso Fiber Karlstad Ab | System for reception and transport of lime mud from a white liquor filter |
EP2773812A4 (en) * | 2011-11-04 | 2015-06-17 | Valmet Oy | Method for the causticizing process for producing white liquor |
EP2773812A1 (en) * | 2011-11-04 | 2014-09-10 | Valmet AB | Method for the causticizing process for producing white liquor |
RU2649268C2 (en) * | 2013-02-26 | 2018-03-30 | Монди Аг | Method of caustification of green liquor |
KR20150126869A (en) * | 2013-02-26 | 2015-11-13 | 몬디 아게 | Process for recausticizing green liquor |
WO2014131067A1 (en) * | 2013-02-26 | 2014-09-04 | Mondi Ag | Process for recausticizing green liquor |
US10011948B2 (en) | 2013-02-26 | 2018-07-03 | Mondi Ag | Process for recausticizing green liquor |
KR102232752B1 (en) | 2013-02-26 | 2021-03-26 | 몬디 아게 | Process for recausticizing green liquor |
EP3280841A4 (en) * | 2015-04-09 | 2018-08-29 | Valmet AB | Method for polysulfide production in a kraft pulp mill |
SE541168C2 (en) * | 2017-01-20 | 2019-04-23 | Valmet Technologies Oy | Method and system of thermal recovery relating to the operation of a dissolver of a chemical recovery boiler |
US10487449B2 (en) | 2017-01-20 | 2019-11-26 | Valmet Technologies Oy | Method and system of thermal recovery relating to the operation of a dissolver of a chemical recovery boiler |
US10640924B2 (en) | 2017-01-20 | 2020-05-05 | Valmet Technologies Oy | System of thermal recovery relating to the operation of a dissolver of a chemical recovery boiler |
CN114229248A (en) * | 2021-11-19 | 2022-03-25 | 山东润德生物科技有限公司 | Be suitable for storage device of storage glucosamine sulfate |
Also Published As
Publication number | Publication date |
---|---|
FI956153A (en) | 1997-06-21 |
FI105933B (en) | 2000-10-31 |
SE9802196L (en) | 1998-07-21 |
FI956153A0 (en) | 1995-12-20 |
SE9802196D0 (en) | 1998-06-18 |
SE523619C2 (en) | 2004-05-04 |
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