CN100372772C - Method for producing powder form aluminum oxide by low concentration solution seed decomposition - Google Patents
Method for producing powder form aluminum oxide by low concentration solution seed decomposition Download PDFInfo
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- CN100372772C CN100372772C CNB2005102003984A CN200510200398A CN100372772C CN 100372772 C CN100372772 C CN 100372772C CN B2005102003984 A CNB2005102003984 A CN B2005102003984A CN 200510200398 A CN200510200398 A CN 200510200398A CN 100372772 C CN100372772 C CN 100372772C
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- Prior art keywords
- decomposition
- seed
- concentration
- aluminum oxide
- low concentration
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Classifications
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- 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
- C01F7/14—Aluminium oxide or hydroxide from alkali metal aluminates
- C01F7/144—Aluminium oxide or hydroxide from alkali metal aluminates from aqueous aluminate solutions by precipitation due to cooling, e.g. as part of the Bayer process
Abstract
The present invention discloses a method for producing powdery aluminum oxide by low concentration solution seed decomposition. A section of decomposition is adopted for producing powdery aluminum oxide; a decomposition tank adopts an ordinary flat mechanical stir decomposition tank; after mixed, refined solution transported from a sedimentation workshop and aluminium hydroxide seeds processed by a seed filtration process are together added in the first two tanks of a decomposition system, wherein the temperature of the first decomposition tank is from 58 DEG C to 61 DEG C; the temperature of the last tank is from 46 DEG C to 49 DEG C; a crystal seed coefficient is from 2.0 to 2.5; decomposition time is from 60 to 62 hours; refined solution concentration is from 90 to 100 g/l of the concentration of Na2OK; Al2O3 concentration is from 80 to 90 g/l; one part of decomposed aluminium hydroxide material slurry is transported to a filtration process of a finished product, and the other part is transported to a seed filtration process; after converged with the refined solution, filtration cakes of seed filtration return to the first two decomposition tanks of the decomposition system. The present invention solves the difficult problem of a decomposition process of the scheme of aluminum decomposition first and iron decomposition afterwards of ferric trihydrol bauxite, and has the advantages of good economic benefit and good social benefit.
Description
Technical field:
The present invention relates to a kind of alumina-producing method, particularly a kind of method for producing powder form aluminum oxide by low concentration solution seed decomposition.
Background technology:
It is one of important procedure in the bayer's process aluminum oxide production process that seed decomposes, and its task is by control kind of branch condition, and aluminium hydroxide is separated out from oversaturated sodium aluminate solution, decomposes the aluminium hydroxide that obtains and handles for subsequent handling.
Because the bauxite difference that alumina producer is handled, leaching condition is different, and the sodium aluminate solution that obtains is formed also difference.On the whole, the alumina producer of domestic processing diaspore, gibbsite, stripping is generally Na after seminal fluid alkali concn and alumina concentration that the leaf filter obtains are all higher
2O
KConcentration 145～172g/l, Al
2O
3Concentration 160～195g/l, seed decompose employing high density, high seed than producing sandy alumina.
At high-iron gibbsite is easy molten gibbsite type and the low characteristics of aluminum oxide grade, and stripping system and the existing alumina producer taked have very big difference, is the low-temperature atmosphere-pressure stripping, and the circulating mother liquor alkali concn is very low, Na
2O
KConcentration is 140g/l only, and the sodium aluminate solution that obtains is formed with domestic processing higher-grade diaspore and the resulting solution of gibbsite bigger difference; Be the low and α of sodium aluminate solution concentration
KThen higher (seminal fluid α
KBe worth about about 1.85), low helping of concentration decomposes, and α
KHeight then is unfavorable for decomposing.
At the characteristics of this low concentration solution, the existing decomposition technique condition of alumina producer can not satisfy the requirement that this lower concentration decomposes.According to experimental study, a kind of decomposition technique technology is proposed, adopt lower concentration to produce powdery aluminum (being also referred to as common shape aluminum oxide).Why producing powdery aluminum, mainly is to consider that the high-iron gibbsite grade is lower.The high-iron gibbsite of this type is in initial development and industrialization conceptual phase at present, and the initial stage scale of founding the factory should not be too big, and production powdery aluminum output is higher, and technical difficulty is less relatively.
Summary of the invention:
The objective of the invention is to: propose a kind of method of producing powder form aluminum oxide by low concentration solution seed decomposition, to solve the difficult problem of iron scheme decomposition process behind the low-grade high-iron gibbsite elder generation aluminium.
The present invention is achieved in that and adopts to decompose a production powdery aluminum; The seminal fluid of sending here from the sedimentation workshop filters with seed and together adds preceding 2 grooves of decomposing system after the next aluminium hydroxide seed of operation mixes, wherein decomposing first-cell temperature is 58～61 ℃, and last groove temperature is 46～49 ℃, crystal seed coefficient 2.0～2.5,60～62 hours resolving times, seminal concentration is Na
2O
KConcentration 90～100g/l, Al
2O
3Concentration 80～90g/l; Aluminum hydroxide slime part after the decomposition goes finished product to filter operation, and another part goes seed to filter operation (the aluminum hydroxide slime allocation proportion serves as the control foundation to decompose first groove crystal seed coefficient 2.0～2.5); After filtering filter cake of seed and seminal fluid converge, return in preceding 2 decomposers of decomposing system.
In above method, decomposer adopts common flat mechanically agitated precipitator; Best decomposer temperature is: 60 ℃ of first grooves, 47～48 ℃ of last grooves.
Adopt above decomposition technique and process control condition, the seminal fluid rate of decomposition can reach 46～48% scopes, decomposes output capacity 41～45kg/m
3-seminal fluid, the aluminium hydroxide that decomposes output obtains powdery aluminum after roasting, and its chemical ingredients reaches the metallurgical grade first grade specification of quality in the YS/T274-1998 standard of national regulation.
The invention has the beneficial effects as follows: use method of the present invention, can solve the difficult problem of iron scheme decomposition process behind the high-iron gibbsite elder generation aluminium, have favorable economic benefit and social benefit.
Embodiment:
Embodiments of the invention 1: adopt one section to decompose the production powdery aluminum, decomposer adopts common flat mechanically agitated precipitator; The seminal fluid of sending here from the sedimentation workshop filters with seed and together adds preceding 2 grooves of decomposing system after the next aluminium hydroxide seed of operation mixes, each amount of 50% of every groove, wherein decomposing first-cell temperature is 60 ℃, last groove temperature is 48 ℃, crystal seed coefficient 2.0～2.5, seminal concentration are Na
2O
KConcentration 90～100g/l, Al
2O
3Concentration 80～90g/l; Decomposed through 61 hours, rate of decomposition reaches 46%; Aluminum hydroxide slime part after the decomposition goes finished product to filter operation as this process product, another part goes seed to filter operation (the aluminum hydroxide slime allocation proportion serves as the control foundation to decompose first groove crystal seed coefficient 2.0～2.5), after filtering filter cake of seed and seminal fluid converge, return in preceding 2 decomposers of decomposing system.
Embodiments of the invention 2: adopt one section to decompose the production powdery aluminum,, adopted 3000m if the plant produced scale is big
3More than large-scale flat mechanically agitated precipitator, be to guarantee decomposition reaction velocity, can conventional intermediate temperature drop facility be set at 4～No. 8 grooves; Wherein decomposing first-cell temperature is 58 ℃, and last groove temperature is 46 ℃, crystal seed coefficient 2.0, and seminal concentration is Na
2O
KConcentration 90g/l, Al
2O
3Concentration 80g/l; Decomposed through 60 hours, rate of decomposition reaches 46%.
Claims (3)
1. the method for a producing powder form aluminum oxide by low concentration solution seed decomposition, it is characterized in that: adopt one section to decompose the production powdery aluminum, the seminal fluid of sending here from the sedimentation workshop filters with seed and together adds preceding 2 grooves of decomposing system after the next aluminium hydroxide seed of operation mixes, wherein decomposing first-cell temperature is 58～61 ℃, end groove temperature is 46～49 ℃, crystal seed coefficient 2.0～2.5,60～62 hours resolving times, seminal concentration is Na
2O
KConcentration 90～100g/l, Al
2O
3Concentration 80～90g/l, seminal fluid α
KValue 1.82～1.90, decomposition nut liquid α
KValue 3.30～3.40; Aluminum hydroxide slime part after the decomposition goes finished product to filter operation, and another part goes seed to filter operation; After filtering filter cake of seed and seminal fluid converge, return in preceding 2 decomposers of decomposing system; The aluminium hydroxide that decomposes output obtains powdery aluminum after roasting.
2. the method for producing powder form aluminum oxide by low concentration solution seed decomposition according to claim 1, it is characterized in that: decomposer adopts common flat mechanically agitated precipitator.
3. the method for producing powder form aluminum oxide by low concentration solution seed decomposition according to claim 1, it is characterized in that: the decomposer temperature is: 60 ℃ of first grooves, 47～48 ℃ of last grooves.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005102003984A CN100372772C (en) | 2005-07-18 | 2005-07-18 | Method for producing powder form aluminum oxide by low concentration solution seed decomposition |
| PCT/CN2006/001743 WO2007009377A1 (en) | 2005-07-18 | 2006-07-18 | A process for preparing powdery alumina from low concentration solution by seed decomposition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005102003984A CN100372772C (en) | 2005-07-18 | 2005-07-18 | Method for producing powder form aluminum oxide by low concentration solution seed decomposition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1730398A CN1730398A (en) | 2006-02-08 |
| CN100372772C true CN100372772C (en) | 2008-03-05 |
Family
ID=35962826
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005102003984A Expired - Fee Related CN100372772C (en) | 2005-07-18 | 2005-07-18 | Method for producing powder form aluminum oxide by low concentration solution seed decomposition |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN100372772C (en) |
| WO (1) | WO2007009377A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103159241A (en) * | 2011-12-15 | 2013-06-19 | 贵阳铝镁设计研究院有限公司 | Two-section decomposition process for alumina production by Bayer process |
| CN105197970B (en) * | 2014-06-27 | 2017-02-22 | 沈阳铝镁设计研究院有限公司 | Method for improving two-stage decomposition effect |
| CN106986362A (en) * | 2017-04-12 | 2017-07-28 | 柳健康 | A kind of sodium aluminate solution high concentration is low admittedly containing one section of seeded precipitation technique |
| CN109592700B (en) * | 2018-12-18 | 2021-07-13 | 广西华银铝业有限公司 | Method for continuously operating decomposition and grading production of alumina plant |
| CN111410221B (en) * | 2020-03-26 | 2022-11-08 | 重庆市九龙万博新材料科技有限公司 | Be applicable to crystal seed processing apparatus among sodium aluminate production technology |
| CN112225237A (en) * | 2020-10-26 | 2021-01-15 | 洛阳莱茵希德特种材料有限公司 | Preparation method of superfine aluminum hydroxide |
| CN112456524A (en) * | 2020-12-10 | 2021-03-09 | 沈阳铝镁设计研究院有限公司 | Method for treating fine seeds by using horizontal tilting disk filter |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB857245A (en) * | 1956-10-22 | 1960-12-29 | Anaconda Co | Improvements in production of alumina |
| CN1003250B (en) * | 1985-04-02 | 1989-02-08 | 富士重工业株式会社 | Apparatus for changing the frequency of a dynamo engine |
| CN1022151C (en) * | 1987-12-15 | 1993-09-15 | 住友电装株式会社 | Electric connector of protecting semi-connecting |
| EP0997435A1 (en) * | 1998-10-28 | 2000-05-03 | Alusuisse Technology & Management AG | Process for the manufacture of coarse aluminium hydroxide |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3269635D1 (en) * | 1982-09-02 | 1986-04-10 | Alcoa Chemie Gmbh | Process for the production of alumine |
| FR2591581B1 (en) * | 1985-12-17 | 1990-05-25 | Pechiney Aluminium | PROCESS FOR OBTAINING HIGH PRODUCTIVITY OF ALUMINUM TRIHYDROXIDE, HIGH PURITY AND MEDIAN DIAMETER LESS THAN 4 MICROMETERS, ADJUSTED ON REQUEST. |
| FR2712275B1 (en) * | 1993-11-09 | 1995-12-15 | Pechiney Aluminium | Process for the treatment of bauxites containing a mixture of alumina trihydrate and alumina monohydrate. |
| CN1424256A (en) * | 2002-12-23 | 2003-06-18 | 广西壮族自治区河池地区矿业有限责任公司 | Production of aluminum oxide from iron containing bauxite |
-
2005
- 2005-07-18 CN CNB2005102003984A patent/CN100372772C/en not_active Expired - Fee Related
-
2006
- 2006-07-18 WO PCT/CN2006/001743 patent/WO2007009377A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB857245A (en) * | 1956-10-22 | 1960-12-29 | Anaconda Co | Improvements in production of alumina |
| CN1003250B (en) * | 1985-04-02 | 1989-02-08 | 富士重工业株式会社 | Apparatus for changing the frequency of a dynamo engine |
| CN1022151C (en) * | 1987-12-15 | 1993-09-15 | 住友电装株式会社 | Electric connector of protecting semi-connecting |
| EP0997435A1 (en) * | 1998-10-28 | 2000-05-03 | Alusuisse Technology & Management AG | Process for the manufacture of coarse aluminium hydroxide |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1730398A (en) | 2006-02-08 |
| WO2007009377A1 (en) | 2007-01-25 |
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Address after: 550081 Guiyang Province, Jinyang New District, Zhu Zhu Road, No. 2 Patentee after: Guiyang Aluminum & Magnesium Design Institute Co., Ltd. Address before: 550004 No. 208, Beijing Road, Guiyang, Guizhou Patentee before: Guiyang Aluminium and Magnesium Design Inst. |
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