WO2009026781A1 - A pipe-type causticizer - Google Patents
A pipe-type causticizer Download PDFInfo
- Publication number
- WO2009026781A1 WO2009026781A1 PCT/CN2008/001428 CN2008001428W WO2009026781A1 WO 2009026781 A1 WO2009026781 A1 WO 2009026781A1 CN 2008001428 W CN2008001428 W CN 2008001428W WO 2009026781 A1 WO2009026781 A1 WO 2009026781A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pipe
- causticizer
- conduit
- static mixing
- type
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/04—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
- C01F7/06—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom by treating aluminous minerals or waste-like raw materials with alkali hydroxide, e.g. leaching of bauxite according to the Bayer process
- C01F7/062—Digestion
- C01F7/064—Apparatus for digestion, e.g. digestor vessels or heat exchangers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/40—Static mixers
- B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
- B01F25/421—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions by moving the components in a convoluted or labyrinthine path
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/40—Static mixers
- B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
- B01F25/421—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions by moving the components in a convoluted or labyrinthine path
- B01F25/423—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions by moving the components in a convoluted or labyrinthine path by means of elements placed in the receptacle for moving or guiding the components
- B01F25/4231—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions by moving the components in a convoluted or labyrinthine path by means of elements placed in the receptacle for moving or guiding the components using baffles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/40—Static mixers
- B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
- B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
- B01F25/433—Mixing tubes wherein the shape of the tube influences the mixing, e.g. mixing tubes with varying cross-section or provided with inwardly extending profiles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/40—Static mixers
- B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
- B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
- B01F25/433—Mixing tubes wherein the shape of the tube influences the mixing, e.g. mixing tubes with varying cross-section or provided with inwardly extending profiles
- B01F25/4331—Mixers with bended, curved, coiled, wounded mixing tubes or comprising elements for bending the flow
Definitions
- This invention relates to pipe causticizers in chemical production, and more particularly to a pipe causticizer for inorganic salts in a causticizing evaporation system in Bayer process alumina production. Background technique
- the inorganic salts discharged from the evaporation system in the existing alumina production are causticized by a causticizing tank group composed of a plurality of causticizing tanks with a stirring and stripping system, and a stirrer is used to ensure the causticizing reaction.
- a causticizing tank group composed of a plurality of causticizing tanks with a stirring and stripping system, and a stirrer is used to ensure the causticizing reaction.
- compressed air is introduced into the causticizing tank to cause the caustic to flow in the causticizing tank.
- Such causticizing systems consume a lot of energy. Summary of the invention
- the technical problem to be solved by the present invention is to provide a pipe causticizer, which aims to make the causticizing agent of the causticizing agent do not need a stirring device and a stripping system to save the energy, and the reaction is sufficient and complete. Reduce caustic energy consumption.
- a pipe causticizer comprising: a pipe; a heater disposed outside the pipe; and a mixer disposed inside the pipe. Both ends of the pipe are the caustic pulp inlet and the caustic pulp outlet.
- the pipe includes a plurality of sections of conduits, and the adjacent two sections of conduits are connected by a connecting pipe.
- the plurality of sections of conduit are arranged in parallel such that the conduits and the connecting tubes together form a substantially serpentine conduit.
- the conduit is substantially straight.
- the connecting pipe is a bent pipe.
- the elbow is 70 of a large bending radius. -120.
- the elbow has a bending radius of 4-20 times the nominal diameter of the elbow.
- the number of the conduits is 2-20.
- the conduit is a steel tube.
- the mixer includes a plurality of static mixing units, each of which is provided with at least one static mixing unit.
- the static mixing unit is an SK type static mixing unit having an irregular spiral inside.
- the heater includes a steam heating jacket disposed on each of the conduits.
- An expansion joint is provided on each steam heating jacket.
- Each steam heating jacket has a steam inlet and a condensate outlet.
- the static mixing unit and the conduit can be either welded or flanged.
- the inorganic salt is mixed with the lime milk to enter the pipe causticizer of the present invention
- the causticization reaction is completed in the pipeline by a certain residence time under the heating of the steam in the heating jacket.
- a static mixer in the pipe causticizer ensures rapid reaction of the caustic solution.
- the present invention not only saves energy but also provides sufficient and complete response.
- Figure 3 is a schematic cross-sectional view of the present invention
- a pipe causticizer generally includes a pipe, a heater disposed outside the pipe, and a mixer disposed inside the pipe.
- the conduit preferably includes a plurality of sections of conduit 8, such as 2-20 conduits.
- the conduit 8 is preferably a steel tube.
- the multi-section conduit 8 is preferably straight and preferably has substantially the same length.
- the multi-section conduits 8 are preferably arranged substantially parallel in a direction transverse to the direction of extension of the conduit 8.
- the two adjacent sections of the conduits 8 are connected by a connecting pipe 6 such that the ducts 8 and the connecting ducts 6 together form a substantially serpentine pipe, the two ends of which are the causticizing slurry inlet 4 and the causticizing pulp outlet 5, respectively.
- the connecting pipe 6 is preferably a bent pipe 6, which preferably belongs to a 70° - 120° elbow with a large bending radius, and has a bending radius of 4-20 times the nominal diameter of the elbow.
- a heater 7 is provided outside each conduit 8 for heating the caustic slurry stream in conduit 8.
- the heater 7 is preferably a steam heating jacket 7, and the steam enters the steam heating jacket 7 to indirectly heat the caustic slurry stream in the conduit 8.
- Each steam heating jacket 7 is connected with a steam inlet 1 and a condensate outlet 2, and steam enters the heating jacket 7 from the inlet 1 and becomes condensed water after being exchanged to be discharged from the condensed water outlet 2.
- the steam heating jacket 7 is only mounted on the conduit 8, and the steam heating jacket 7 is not provided on the connecting pipe 6.
- the number of steam heating jackets 7 is the same as the number of conduits 8.
- An expansion joint 3 is provided on each of the steam heating jackets 7 for eliminating the thermal expansion effect, and the expansion amount of the expansion joints 3 is determined according to the length of the heating jacket 7.
- a mixer is provided inside each section of the conduit 8.
- 1-10 static mixing units 9 are connected to the inner wall of each section of the conduit 8.
- the static mixing unit 9 is preferably a SK type static mixing unit having an irregular spiral inside. .
- the above-mentioned conduit 8 is a causticizing reactor, and the total length of these conduits 8 is based on causticizing The reaction time is determined.
- the mixed caustic slurry is introduced into the pipe causticizer from the causticized pulp inlet, and the steam enters the steam heating jacket to indirectly heat the caustic slurry in the pipeline.
- the causticizing pulp undergoes a causticizing reaction when it flows, and the causticizing pulp is further mixed after flowing through the static mixing unit to accelerate the reaction process.
- the causticized pulp has sufficient residence time in the pipe causticizer to complete the reaction.
- the reacted caustic pulp is discharged from the system by the causticizing pulp outlet.
Landscapes
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Nutrition Science (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- General Health & Medical Sciences (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Paper (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2008291570A AU2008291570B2 (en) | 2007-08-23 | 2008-08-05 | A pipe-type causticizer |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN200710012558.1 | 2007-08-23 | ||
CNA2007100125581A CN101372349A (en) | 2007-08-23 | 2007-08-23 | Pipeline causticizer |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2009026781A1 true WO2009026781A1 (en) | 2009-03-05 |
Family
ID=40386666
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CN2008/001428 WO2009026781A1 (en) | 2007-08-23 | 2008-08-05 | A pipe-type causticizer |
Country Status (3)
Country | Link |
---|---|
CN (1) | CN101372349A (en) |
AU (1) | AU2008291570B2 (en) |
WO (1) | WO2009026781A1 (en) |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS538668A (en) * | 1976-07-13 | 1978-01-26 | Denki Kagaku Kogyo Kk | Extruder for thermoplastic resin foam |
SU639510A1 (en) * | 1977-09-27 | 1978-12-30 | Таллинская Кондитерская Фабрика "Калев" | Fruit jelly production line |
SU827137A1 (en) * | 1979-06-01 | 1981-05-07 | Казанский Научно-Исследовательскийтехнологический И Проектный Инсти-Тут Химико-Фотографической Промыш-Ленности | Static mixer |
JPH04156901A (en) * | 1990-10-22 | 1992-05-29 | Asahi Chem Ind Co Ltd | Method and device for continuously concentrating viscous solution |
JPH067799A (en) * | 1992-06-26 | 1994-01-18 | Kubota Corp | Transport and drying method by dehydrated cake pipeline |
JPH09255744A (en) * | 1996-03-25 | 1997-09-30 | Sumitomo Bakelite Co Ltd | Production of phenol resin |
JPH09255745A (en) * | 1996-03-25 | 1997-09-30 | Sumitomo Bakelite Co Ltd | Production of phenol resin |
JP2003171471A (en) * | 2001-12-10 | 2003-06-20 | Fuji Photo Film Co Ltd | Method of preparation of cellulose acetate dope |
-
2007
- 2007-08-23 CN CNA2007100125581A patent/CN101372349A/en active Pending
-
2008
- 2008-08-05 WO PCT/CN2008/001428 patent/WO2009026781A1/en active Application Filing
- 2008-08-05 AU AU2008291570A patent/AU2008291570B2/en active Active
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS538668A (en) * | 1976-07-13 | 1978-01-26 | Denki Kagaku Kogyo Kk | Extruder for thermoplastic resin foam |
SU639510A1 (en) * | 1977-09-27 | 1978-12-30 | Таллинская Кондитерская Фабрика "Калев" | Fruit jelly production line |
SU827137A1 (en) * | 1979-06-01 | 1981-05-07 | Казанский Научно-Исследовательскийтехнологический И Проектный Инсти-Тут Химико-Фотографической Промыш-Ленности | Static mixer |
JPH04156901A (en) * | 1990-10-22 | 1992-05-29 | Asahi Chem Ind Co Ltd | Method and device for continuously concentrating viscous solution |
JPH067799A (en) * | 1992-06-26 | 1994-01-18 | Kubota Corp | Transport and drying method by dehydrated cake pipeline |
JPH09255744A (en) * | 1996-03-25 | 1997-09-30 | Sumitomo Bakelite Co Ltd | Production of phenol resin |
JPH09255745A (en) * | 1996-03-25 | 1997-09-30 | Sumitomo Bakelite Co Ltd | Production of phenol resin |
JP2003171471A (en) * | 2001-12-10 | 2003-06-20 | Fuji Photo Film Co Ltd | Method of preparation of cellulose acetate dope |
Also Published As
Publication number | Publication date |
---|---|
AU2008291570A1 (en) | 2009-03-05 |
AU2008291570B2 (en) | 2012-03-15 |
CN101372349A (en) | 2009-02-25 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2017107304A1 (en) | Fusion mixer for processing high-viscosity material | |
DK2622297T3 (en) | Waste heat boiler | |
JP3274280B2 (en) | High pressure reaction vessel equipment | |
WO2009026781A1 (en) | A pipe-type causticizer | |
CN106492734A (en) | A kind of Chemical Manufacture highly effective reaction kettle | |
CN205843436U (en) | A kind of heat exchanger of thermal source Multi-class propagation | |
JP2010534312A (en) | Flameless combustion heater | |
CN209173918U (en) | A kind of gas liquid reaction kettle device | |
CN207622577U (en) | A kind of heat exchanger | |
CN207006932U (en) | A kind of heat exchanger | |
CN102853709A (en) | Multi-double-pipe connecting structure for heat exchangers | |
CN201121133Y (en) | Pipeline causticizing apparatus | |
CN210400079U (en) | Heat exchanger for heating air by steam | |
CN102944128A (en) | Exhaust heat recovery device of textile printing and dyeing forming machine | |
CN202580607U (en) | Liquid chlorine gasification device | |
CN207569906U (en) | A kind of heat exchanger of improvement | |
CN206369489U (en) | The heat exchanger of indirect steam | |
EP2424652B1 (en) | Catalyst reaction apparatus and process | |
CN200972341Y (en) | Conversion turbulence modified plasma high temp. heat exchange set | |
CN213050524U (en) | Medicine distillation reation kettle | |
CN202023107U (en) | Black liquor heater | |
WO2008038363A1 (en) | Heat exchanger | |
CN217275723U (en) | Novel baffle type snakelike heat exchange tube | |
CN212327451U (en) | Chemical waste gas conduction device that flexibility is strong | |
CN217154159U (en) | Boiler system |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 08783617 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2008291570 Country of ref document: AU |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
ENP | Entry into the national phase |
Ref document number: 2008291570 Country of ref document: AU Date of ref document: 20080805 Kind code of ref document: A |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 08783617 Country of ref document: EP Kind code of ref document: A1 |