WO2009026781A1 - Caustificateur de type canalisation - Google Patents

Caustificateur de type canalisation Download PDF

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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
Application number
PCT/CN2008/001428
Other languages
English (en)
Chinese (zh)
Inventor
Liang Wang
Shujie Ma
Fenglu Zhou
Original Assignee
China Aluminium International Engineering Corporation Limited
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 China Aluminium International Engineering Corporation Limited filed Critical China Aluminium International Engineering Corporation Limited
Priority to AU2008291570A priority Critical patent/AU2008291570B2/en
Publication of WO2009026781A1 publication Critical patent/WO2009026781A1/fr

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

L'invention porte sur un caustificateur de type canalisation utilisé dans l'industrie chimique, notamment sur un caustificateur de type canalisation utilisé pour effectuer la caustification de sels inorganiques dans un système d'évaporation dans la préparation de l'alumine par le procédé Bayer. Le présent caustificateur de type canalisation consiste en une canalisation (8), une chemise (7) de chauffage par vapeur d'eau disposée à l'extérieur de la canalisation (8) et un élément de mélange statique (9) disposé à l'intérieur de la canalisation (8), une admission de vapeur d'eau (1) et une évacuation d'eau de condensation (2) reliées à la chemise (7) de chauffage par vapeur d'eau. Les sels inorganiques sont mélangés à de la crème de chaux, puis le mélange est introduit dans le caustificateur de type canalisation, la réaction de caustification est effectuée dans le conduit du caustificateur de type canalisation pendant un temps de séjour donné et sous chauffage par vapeur d'eau dans la chemise de chauffage. Pendant la réaction, l'élément de mélange statique à l'intérieur du caustificateur de type canalisation peut assurer une réaction rapide du liquide de caustification. Le dispositif permet d'économiser l'énergie et peut rendre la réaction totale et complète.
PCT/CN2008/001428 2007-08-23 2008-08-05 Caustificateur de type canalisation WO2009026781A1 (fr)

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
CNA2007100125581A CN101372349A (zh) 2007-08-23 2007-08-23 管道苛化器
CN200710012558.1 2007-08-23

Publications (1)

Publication Number Publication Date
WO2009026781A1 true WO2009026781A1 (fr) 2009-03-05

Family

ID=40386666

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2008/001428 WO2009026781A1 (fr) 2007-08-23 2008-08-05 Caustificateur de type canalisation

Country Status (3)

Country Link
CN (1) CN101372349A (fr)
AU (1) AU2008291570B2 (fr)
WO (1) WO2009026781A1 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
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 (ru) * 1977-09-27 1978-12-30 Таллинская Кондитерская Фабрика "Калев" Лини дл производства мармелада
SU827137A1 (ru) * 1979-06-01 1981-05-07 Казанский Научно-Исследовательскийтехнологический И Проектный Инсти-Тут Химико-Фотографической Промыш-Ленности Статический смеситель
JPH04156901A (ja) * 1990-10-22 1992-05-29 Asahi Chem Ind Co Ltd 高粘度溶液の連続濃縮方法およびその装置
JPH067799A (ja) * 1992-06-26 1994-01-18 Kubota Corp 脱水ケーキの管路による輸送ならびに乾燥方法
JPH09255745A (ja) * 1996-03-25 1997-09-30 Sumitomo Bakelite Co Ltd フェノール樹脂の製造方法
JPH09255744A (ja) * 1996-03-25 1997-09-30 Sumitomo Bakelite Co Ltd フェノール樹脂の製造方法
JP2003171471A (ja) * 2001-12-10 2003-06-20 Fuji Photo Film Co Ltd セルロースアセテートドープの調製方法

Patent Citations (8)

* Cited by examiner, † Cited by third party
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 (ru) * 1977-09-27 1978-12-30 Таллинская Кондитерская Фабрика "Калев" Лини дл производства мармелада
SU827137A1 (ru) * 1979-06-01 1981-05-07 Казанский Научно-Исследовательскийтехнологический И Проектный Инсти-Тут Химико-Фотографической Промыш-Ленности Статический смеситель
JPH04156901A (ja) * 1990-10-22 1992-05-29 Asahi Chem Ind Co Ltd 高粘度溶液の連続濃縮方法およびその装置
JPH067799A (ja) * 1992-06-26 1994-01-18 Kubota Corp 脱水ケーキの管路による輸送ならびに乾燥方法
JPH09255745A (ja) * 1996-03-25 1997-09-30 Sumitomo Bakelite Co Ltd フェノール樹脂の製造方法
JPH09255744A (ja) * 1996-03-25 1997-09-30 Sumitomo Bakelite Co Ltd フェノール樹脂の製造方法
JP2003171471A (ja) * 2001-12-10 2003-06-20 Fuji Photo Film Co Ltd セルロースアセテートドープの調製方法

Also Published As

Publication number Publication date
CN101372349A (zh) 2009-02-25
AU2008291570A1 (en) 2009-03-05
AU2008291570B2 (en) 2012-03-15

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