WO1996026900A1 - Procede de traitement de l'hydroxyde d'aluminium - Google Patents

Procede de traitement de l'hydroxyde d'aluminium Download PDF

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Publication number
WO1996026900A1
WO1996026900A1 PCT/JP1996/000232 JP9600232W WO9626900A1 WO 1996026900 A1 WO1996026900 A1 WO 1996026900A1 JP 9600232 W JP9600232 W JP 9600232W WO 9626900 A1 WO9626900 A1 WO 9626900A1
Authority
WO
WIPO (PCT)
Prior art keywords
aluminum hydroxide
amorphous
aluminum
solid
liquid separation
Prior art date
Application number
PCT/JP1996/000232
Other languages
English (en)
Japanese (ja)
Inventor
Shigetaka Ito
Original Assignee
Shoden System Co., Ltd
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 Shoden System Co., Ltd filed Critical Shoden System Co., Ltd
Priority to AU45489/96A priority Critical patent/AU4548996A/en
Priority to KR1019960705116A priority patent/KR100200173B1/ko
Publication of WO1996026900A1 publication Critical patent/WO1996026900A1/fr

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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
    • C01F7/68—Aluminium compounds containing sulfur
    • C01F7/74—Sulfates
    • 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
    • C01F7/46—Purification of aluminium oxide, aluminium hydroxide or aluminates

Definitions

  • the present invention relates to a method for treating aluminum hydroxide, and more particularly to a method for treating amorphous aluminum hydroxide (sludge) discharged from a processing plant of aluminum or an aluminum alloy.
  • amorphous aluminum hydroxide sludge
  • Aluminum (amorphous) recovered from wastewater containing aluminum, which is exchanged from aluminum or aluminum alloy processing plants, can be used for various kinds of gold JS compounds, organic polymer compounds (coagulants), Acidic acid or the like is contained as an impurity, and this is subjected to a dehydration step by a filtration operation or the like, whereby a sticky amorphous hydroxide sludge having a water content of about 80% can be obtained.
  • liquid sulfuric acid band obtained in this way has a large amount of water in the freezing sludge, so that the liquid sulfuric acid band is considerably thinner than the standard standard product, and it is necessary to concentrate this from the viewpoint of transportation costs.
  • bottles that concentrate the dilute liquid acid band with an evaporator require a large amount of heat, and the scale of various impurities adheres to the evaporator.
  • the sludge of flocculent, focussed aluminum hydroxide recovered from aluminum and aluminum alloy processing plants has a high water content of 80% and contains a polymer flocculant, so it is sticky. It is difficult to handle.
  • the aluminum hydroxide sludge is dissolved in a caustic alkali solution in the case of purification treatment, but the aluminum hydroxide sludge is not clinker-shaped to maintain its solubility. It is necessary to dry while maintaining the amorphous shape.
  • K aluminum hydroxide sludge should be used effectively In this case, since various metal compounds are contained as impurities, it is necessary to develop an efficient removal method.
  • the aluminum hydroxide after removing impurities of the various metal compounds contains gay acid as an impurity, and it is necessary to develop an efficient removal method.
  • the aluminum component purified and recovered in this way is used as aluminum sulfate, and the effective use of inexpensively supplied waste sulfuric acid solution to ensure cost competitiveness as an industrial product Is required.
  • the present invention solves the above various problems, reduces the water content of the sludge of amorphous aluminum hydroxide without changing its properties, and removes various metal compounds and gay acid. To implement a processing method. It is an object of the present invention to realize a method for treating aluminum hydroxide that can be used. Disclosure of the invention
  • the amorphous aluminum hydroxide is finely pulverized and then dispersed in a high-speed hot air flow to instantaneously disperse the water in the aluminum hydroxide.
  • the temperature rise of the aluminum hydroxide is reduced by 100. C, so that its water content: ft is reduced to the same level as crystalline aluminum hydroxide while maintaining its amorphous and caustic solubility.
  • amorphous aluminum hydroxide having a water content of 80% is finely pulverized to increase the surface area, and then dispersed in a high-speed hot air stream. At that time, due to the latent heat of evaporation of water, W
  • the aluminum hydroxide powder is kept at 100 ° C. or less, it does not become a clicker.
  • the finely powdered dried amorphous aluminum hydroxide obtained by the method (1) contains a metal compound and an organic;
  • the amorphous aluminum hydroxide is dissolved in an aqueous caustic solution until the aluminum concentration becomes saturated until the aluminum oxide concentration is reached, thereby precipitating the compound. .
  • the fine powder of the amorphous aluminum hydroxide sludge thus dried contains various gold compounds and organic polymer compounds as impurities.
  • various dissolved gold compounds are replaced by aluminum and become insoluble compounds, which precipitate in the solution. Therefore, it can be removed by solid-liquid separation.
  • the liquid extinguishing solution containing the aqueous caustic solution obtained by the solid-liquid separation method carried out in the above (2) can be recycled.
  • the crystalline hydroxide which is precipitated from the aqueous caustic solution obtained by the methods (2) and (3) and recovered by solid-liquid separation is used.
  • aluminum ⁇ case including gay acid clay the recovered aluminum hydroxide dissolved in aqueous sulfuric acid, by holding and [rho Eta at 6 0 beta C or 1-2, insoluble the Kei Sanhani After being converted into a degradable polymer, it is cooled and separated by solid-liquid separation.
  • the aluminum hydroxide to be recovered contains silicate as an impurity.
  • the crystalline aluminum hydroxide powder containing the citric acid was dissolved in an aqueous sulfuric acid solution.
  • PH aqueous sulfuric acid solution
  • the acid becomes an insoluble polymer and precipitates out.
  • impurities in the maleic acid lump can be removed by cooling and then solid-liquid separation.
  • sulfuric acid discharged from the alumite processing step can be used as the aqueous sulfuric acid solution of (4).
  • FIG. 1 is a diagram schematically showing an apparatus for executing the method for treating aluminum hydroxide according to the present invention (1) to (3).
  • Twentieth is a diagram schematically showing an apparatus for performing the method for treating aluminum hydroxide according to the present invention (4) and (5).
  • raw material hopper 1 is charged with 200 kg of amorphous aluminum hydroxide sludge.
  • the city gas [13 type 110001 ⁇ 31 / ⁇ 3 ] is fired in the open fire furnace 2, and the gas temperature at the inlet of the flash dryer 3, which is set so that the outlet temperature automatically becomes 250 ° C, is diluted with air. Inject at 1 50 while adding.
  • the rotation speed of the motor 5 for rotating the sludge tray 4 in the pulverizing section of the flash dryer 3 was set to 4500 rpm, and the movable hammer (see FIG. Is rotated at the same time.
  • the current value at this time was stable at an average of 1 OA.
  • the number of rotations of the rotor of the classifier 6 was set at 500 rpm with a target product particle size of 60 / m.
  • the current value at this time is stable at 2.9 A.
  • 35 kg of amorphous aluminum hydroxide sludge is supplied per hour from the pig feed hopper 1 by the screw feeder 7.
  • the gas outlet temperature of the flash dryer 3 was 80 to 90.
  • the temperature of the dried aluminum hydroxide sludge collected by suction through the classifier 6 and collected by the air blower 9 with the bag filter 8 through the bag filter 8 was sequentially measured, and was found to be 40 to 59.
  • the dried aluminum hydroxide sludge treated by the flash dryer 3 and collected by the bag filter 8 is fed from the conveyor 13 via the rotary valve 12 to the powder meter 1 1 1 Add 40 kg. After stirring with C for 30 minutes, the mixture became brownish liquid and suspended matter was confirmed.
  • the mixed solution (10 OmI) was collected and filtered with 5 A paper, and the aluminum concentration was measured to be 24.1 I. Thereafter, measurement was performed four times at 15 minute intervals, for a total of 120 minutes, but in each case it was about 24.3 ⁇ 0.3 g / l, and it was judged that the reaction was completed 30 minutes after addition. .
  • the usefulness is 30 g / I, but it can be judged that the difference was lost due to the adhesion to the suspended matter R etc.
  • the mixed solution was filtered with a manual filter press machine 15 and transferred to a precipitation tank 17 through a furnace tank 16.
  • the maximum overpressure at this time was 4.7 kg / cm 2 . »1, 1 18 kg of liquid was obtained, and 18.3 kg of waste was obtained in the remaining brewing saucer 18.
  • the loss of 36 kg was due to the adhesion to the rag, etc., and the loss due to the liquid that could not be removed or stored in the filter or the first discarded liquid.
  • the slurry was precipitated in a precipitation tank 17 to obtain a slurry containing crystalline aluminum hydroxide.
  • reaction solution was collected and the aluminum dust was determined in the furnace solution after destruction.
  • the concentration of aluminum sulfate which is a reasonable value in terms of aluminum sulfate, is 8.
  • the liquid in the furnace a is passed through a leaf filter furnace 24 and transferred to an aluminum sulfate tank 25.
  • the amorphous aluminum hydroxide is finely pulverized and the water is instantaneously evaporated to thereby form an amorphous and caustic aluminum hydroxide.
  • the structure is designed to reduce the water content to the same level as crystalline aluminum hydroxide while maintaining solubility in water, facilitating dissolution in alkaline solutions and powdery for easy handling.
  • the dried amorphous hydroxide hydroxide in the form of fine powder obtained as described above A bottle containing aluminum as a metal compound and an organic polymer compound as impurities, and dissolving the amorphous aluminum hydroxide in an aqueous solution of caustic aluminum until the aluminum substitution becomes saturated. Since the compound is precipitated and removed by further solid-liquid separation, the purity of the aluminum hydroxide is increased and the whiteness is improved, so that its utility value as an industrial product is increased. .
  • the crystalline aluminum hydroxide precipitated from the aqueous caustic solution obtained as described above and collected by solid-liquid separation contains gay acid, the crystalline aluminum hydroxide is converted to sulfuric acid. Dissolved in aqueous solution,
  • the silicate is cooled and separated by cocoon separation on the surface liquid.
  • an industrial product in which the component of the liquid oxidized band is equivalent to that of the sulfuric acid band for water supply is obtained.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Inorganic Chemistry (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)

Abstract

L'invention concerne un procédé de traitement de l'hydroxyde d'aluminium amorphe destiné à réduire la teneur en eau d'une boue faite de cette matière sans modifier les propriétés de l'hydroxyde et à en extraire différents composés métalliques et silicates. Selon ce procédé, on pulvérise l'hydroxyde d'aluminum amorphe puis on le soumet à une évaporation d'eau instantanée, ce qui permet de réduire la teneur en eau à un niveau égal à celui de l'hydroxyde d'aluminium cristallin tout en maintenant son état amorphe et sa solubilité dans les alcalis caustiques. Ensuite, si l'hydroxyde d'aluminium amorphe sous forme séchée et en fines particules contient des composés métalliques et des composés polymères organiques en tant qu'impuretés, on peut dissoudre l'hydroxyde d'aluminium amorphe dans une solution aqueuse d'alcali caustique jusqu'à ce que la concentration d'aluminum soit sursaturée, ce qui a pour effet de précipiter les composés qui sont ensuite extraits par séparation solide-liquide. Puis, si l'hydroxyde d'aluminium cristallin précipité à partir d'une solution aqueuse d'alcali caustique puis récupéré par séparation solide-liquide contient des silicates, on peut le dissoudre dans une solution aqueuse d'acide sulfurique et le maintenir à 60 °C ou plus à un pH de 1 à 2 afin de convertir les silicates en polymères insolubles, lesquels sont ensuite refroidis et extraits par séparation solide-liquide.
PCT/JP1996/000232 1995-02-28 1996-02-05 Procede de traitement de l'hydroxyde d'aluminium WO1996026900A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU45489/96A AU4548996A (en) 1995-02-28 1996-02-05 Method for treating aliminum hydroxide
KR1019960705116A KR100200173B1 (ko) 1995-02-28 1996-02-05 수산화 알루미늄의 처리방법

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP7040322A JP2665183B2 (ja) 1995-02-28 1995-02-28 水酸化アルミニウムの処理方法
JP7/40322 1995-02-28

Publications (1)

Publication Number Publication Date
WO1996026900A1 true WO1996026900A1 (fr) 1996-09-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1996/000232 WO1996026900A1 (fr) 1995-02-28 1996-02-05 Procede de traitement de l'hydroxyde d'aluminium

Country Status (4)

Country Link
JP (1) JP2665183B2 (fr)
KR (1) KR100200173B1 (fr)
AU (1) AU4548996A (fr)
WO (1) WO1996026900A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0984011A1 (fr) * 1998-09-01 2000-03-08 Nissan Chemical Industries, Limited Procédé pour la réduction du solvant organique qui reste dans les crystals du tris-(2,3-époxypropyl)-isocyanurate
CN103101938A (zh) * 2011-11-14 2013-05-15 沈阳铝镁设计研究院有限公司 降低蒸发过程蒸汽消耗量的方法
GB2586951A (en) * 2019-06-12 2021-03-17 Ardex Anlagen Gmbh A method and apparatus for processing water treatment residuals

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1189398C (zh) * 2001-07-11 2005-02-16 住友化学工业株式会社 制造氢氧化铝的方法
KR101913700B1 (ko) 2018-06-15 2018-10-31 정석관 황산알루미늄 파우더의 제조방법

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51148256A (en) * 1975-06-13 1976-12-20 Kimura Kakoki Kk Method of disposing waste water produced in washing process of surface treatment on molded aluminium
JPS55162424A (en) * 1979-05-30 1980-12-17 Toyo Sash Kk Silicon removing method
JPS5761697B2 (fr) * 1978-06-01 1982-12-25 Sumitomo Aluminium Smelting Co

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51148256A (en) * 1975-06-13 1976-12-20 Kimura Kakoki Kk Method of disposing waste water produced in washing process of surface treatment on molded aluminium
JPS5761697B2 (fr) * 1978-06-01 1982-12-25 Sumitomo Aluminium Smelting Co
JPS55162424A (en) * 1979-05-30 1980-12-17 Toyo Sash Kk Silicon removing method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0984011A1 (fr) * 1998-09-01 2000-03-08 Nissan Chemical Industries, Limited Procédé pour la réduction du solvant organique qui reste dans les crystals du tris-(2,3-époxypropyl)-isocyanurate
US6111104A (en) * 1998-09-01 2000-08-29 Nissan Chemical Industries, Ltd. Method for reducing an organic solvent remaining in tris-(2,3-epoxypropyl)-isocyanurate crystals
CN103101938A (zh) * 2011-11-14 2013-05-15 沈阳铝镁设计研究院有限公司 降低蒸发过程蒸汽消耗量的方法
GB2586951A (en) * 2019-06-12 2021-03-17 Ardex Anlagen Gmbh A method and apparatus for processing water treatment residuals
GB2586951B (en) * 2019-06-12 2024-01-31 Ardex Group Gmbh A method and apparatus for processing water treatment residuals

Also Published As

Publication number Publication date
JP2665183B2 (ja) 1997-10-22
AU4548996A (en) 1996-09-18
KR100200173B1 (ko) 1999-06-15
JPH08231217A (ja) 1996-09-10

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