CN100572280C - The method that a kind of mother liquor floating material during production of aluminum oxide is handled - Google Patents
The method that a kind of mother liquor floating material during production of aluminum oxide is handled Download PDFInfo
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- CN100572280C CN100572280C CNB2007101796390A CN200710179639A CN100572280C CN 100572280 C CN100572280 C CN 100572280C CN B2007101796390 A CNB2007101796390 A CN B2007101796390A CN 200710179639 A CN200710179639 A CN 200710179639A CN 100572280 C CN100572280 C CN 100572280C
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- China
- Prior art keywords
- seston
- slurries
- mother liquor
- aluminum oxide
- aluminium hydroxide
- Prior art date
- Legal status (The legal status 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 status listed.)
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 239000012452 mother liquor Substances 0.000 title claims abstract description 26
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 239000000463 material Substances 0.000 title claims abstract description 17
- 238000007667 floating Methods 0.000 title claims abstract description 15
- 239000005432 seston Substances 0.000 claims abstract description 48
- 239000002002 slurry Substances 0.000 claims abstract description 35
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims abstract description 26
- 229910021502 aluminium hydroxide Inorganic materials 0.000 claims abstract description 24
- 238000004131 Bayer process Methods 0.000 claims abstract description 20
- 238000010790 dilution Methods 0.000 claims abstract description 15
- 239000012895 dilution Substances 0.000 claims abstract description 15
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000000243 solution Substances 0.000 claims abstract description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 9
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910001388 sodium aluminate Inorganic materials 0.000 claims abstract description 6
- 239000012141 concentrate Substances 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims description 9
- 238000000354 decomposition reaction Methods 0.000 claims description 6
- 238000004090 dissolution Methods 0.000 claims description 5
- 238000007701 flash-distillation Methods 0.000 claims description 5
- 239000006210 lotion Substances 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 3
- 210000000582 semen Anatomy 0.000 abstract description 7
- 230000015556 catabolic process Effects 0.000 abstract description 3
- 239000013078 crystal Substances 0.000 abstract description 3
- 230000029087 digestion Effects 0.000 abstract description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- 239000003518 caustics Substances 0.000 description 3
- 229910001648 diaspore Inorganic materials 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- 239000006200 vaporizer Substances 0.000 description 3
- 206010039509 Scab Diseases 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000003513 alkali Substances 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 230000004087 circulation Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229960001866 silicon dioxide Drugs 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001839 systemic circulation Effects 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Landscapes
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The method that a kind of mother liquor floating material during production of aluminum oxide is handled relates to a kind of treatment process of alumina-producing method mother liquor.It is characterized in that its treating processes is the mother liquor that sodium aluminate concentrate solution is obtained after kind of branch or carbon divide, be modulated into through the aluminium hydroxide seston of filtered and recycled again and enter Bayer process self-evaporatint n. system behind the slurries or dilution system carries out stripping.Method of the present invention has avoided seston directly to enter the ropy problem of carbon operation break-down products obtained therefrom as product or as crystal seed, also overcome seston and entered the problem that Bayer process batching and digestion series can not improve output and cycle efficiency, can be with a Bayer process series seminal fluid causticity than reducing by 1%～8%, cycle efficiency improves 1.5%～17%.
Description
Technical field
The method that a kind of mother liquor floating material during production of aluminum oxide is handled relates to the treatment process of mother liquor in a kind of alumina producing.
Background technology
Alkaline process is produced in the alumina technology, and sodium aluminate solution decomposes after the seston of the some amount that still suspends in the mother liquor of solid-liquid separation, and its main component is the aluminium hydroxide of subparticle.At present, in process of production, up to being 8.2g/L, carbon mother liquid seston content is up to 4.97g/L sometimes for seed precipitation solution seston content.These sestons are circulated on stream, power charge, recondition expense and the spare part expense of various device have been increased, if not treated the entering in the vapo(u)rization system with mother liquor of seston can produce aluminum hydroxide scab, cause a series of detrimentally affects of degradation under line clogging, the heat transfer coefficient.Shorten the life cycle of vaporizer, reduced the production capacity of vaporizer simultaneously, increased the steam consumption, caused certain energy dissipation.
For reducing the content of its seston in vaporizing raw liquor, in the present production process, take simple sedimentation method to handle to seed precipitation solution usually, under mother liquor tank, build a settling tank, regularly the stoste bottom land is banished material.More efficiently way is the seston that utilizes in subsider and the plate-and-frame filter press recovery mother liquor, can significantly reduce scabbing of pipeline and vaporizer, has also reduced material circulation on stream, has improved the total yield of aluminum oxide, increases economic efficiency simultaneously.
Thin for the seston hydroxide particle-size after reclaiming, silicon-dioxide foreign matter content height, directly as the product calcining, physicals and chemical quality all do not meet the sandy alumina requirement.Existing technology (having sintering process to produce alumina technology) adds the carbonating decomposition process with this part seston as crystal seed, but can influence product aluminum oxide quality equally, does not reach the metallurgical-grade aluminum oxide technical indicator.
Disclosed technical scheme in the seston treatment process in the patent CN1562754 alumina producing is that filter cake adds mother liquid evaporation slurrying, then slurries is entered the digestion series of alumina producing with circulating mother liquor with the seed precipitation solution secondary filtration after decomposing.This method that this patent proposes no doubt can reclaim seston aluminium hydroxide, but just enter Bayer process batching procephalon and pyritous stripping operation as soluble mineral, can not reduce existing dissolution fluid causticity ratio, do not improve the total yield of aluminum oxide, thereby can't improve systemic circulation efficient.
Application number is the Al (OH) that 200410100969 patent carbon mother liquid degree of depth carbon branch obtains
3Product joins Bayer process stripping slurry flash-pot to the technology between the stripping slurry dilution trap, can make Bayer process seminal fluid causticity than reducing to 1.25～1.45 from about 1.55.
Summary of the invention
The objective of the invention is deficiency at above-mentioned prior art existence, provide a kind of and can make effectively separating of aluminium hydroxide and free silica in the seston, reduce the seminal fluid caustic ratio, the method that the mother liquor floating material during production of aluminum oxide of the quality of raising aluminum oxide is handled.
The objective of the invention is to be achieved through the following technical solutions.
The method that a kind of mother liquor floating material during production of aluminum oxide is handled, it is characterized in that its treating processes is the mother liquor that sodium aluminate concentrate solution is obtained after kind of branch or carbon divide, be modulated into through the aluminium hydroxide seston of filtered and recycled again and enter Bayer process self-evaporatint n. system behind the slurries or dilution system carries out stripping.
The method that a kind of mother liquor floating material during production of aluminum oxide of the present invention is handled is characterized in that described aluminium hydroxide seston is with decomposition nut liquid or alumina producing system washing lotion modulation slurries.
The method that a kind of mother liquor floating material during production of aluminum oxide of the present invention is handled, it is characterized in that described aluminium hydroxide seston slurries squeeze into the pipeline pre-heating system with pump and enter Bayer process self-evaporatint n. system after preheating, or directly squeeze into the Bayer process dilution system with pump.
The method that a kind of mother liquor floating material during production of aluminum oxide of the present invention is handled is characterized in that in the slurries that described aluminium hydroxide seston is modulated into, and it is 500～1000g/L that the consolidating of seston contains; 105～145 ℃ of slurries preheating temperatures; Slurries pipeline preheat stage number: 2～3 grades; Slurries pipeline preheating steam, the secondary vapour of the corresponding flash-pot flash distillation of use temperature.
The method that a kind of mother liquor floating material during production of aluminum oxide of the present invention is handled is characterized in that the slurries dissolution time that described aluminium hydroxide seston is modulated into is 5～10 minutes.
Method of the present invention, after its objective is aluminium hydroxide seston recovery with the alumina producing system, directly add Bayer process self-evaporatint n. system or dilution system and carry out stripping, not only make effectively separating of aluminium hydroxide and free silica in the seston, and can reduce the seminal fluid caustic ratio, help the production of sandy alumina and the raising of Bayer process cycle efficiency.
It is thin that the present invention has made full use of in the seston aluminum hydroxide particles, active high, is easy to the characteristics of stripping, and seston is directly added lower flash-pot of temperature or dilution system, realizes quick stripping and the high efficiente callback of seston.
The inventive method reclaims the aluminium hydroxide in the seston, without the pyritous stripping stage, but the abbreviated system that adopts seston directly to enter aluminum oxide self-evaporatint n. or dilution system.Avoided seston directly to enter the ropy problem of carbon operation break-down products obtained therefrom as product or as crystal seed, also overcome seston and entered the problem that the Bayer process feed proportioning system can not improve output and cycle efficiency, can be with Bayer process seminal fluid causticity than reducing by 1%～8%, cycle efficiency improves 1.5%～17%.
Embodiment
The method that a kind of mother liquor floating material during production of aluminum oxide is handled, the mother liquor that sodium aluminate concentrate solution is obtained after kind of branch or carbon divide at first, the aluminium hydroxide seston through filtered and recycled is modulated into slurries with decomposition nut liquid or alumina producing system washing lotion again; Then aluminium hydroxide seston slurries are squeezed into the pipeline pre-heating system with pump and after preheating, enter Bayer process self-evaporatint n. system, or directly squeeze into the Bayer process dilution system with pump; Its technical indicator is: it is 500～1000g/L that aluminium hydroxide seston slurries contain admittedly; 105～145 ℃ of slurries preheating temperatures; Slurries pipeline preheat stage number: 2～3 grades; Slurries pipeline preheating steam, the secondary vapour of corresponding flash-pot flash distillation; Aluminium hydroxide seston slurries dissolution time 5～10 minutes.
In the stripping process by Bayer process of diaspore, the ore pulp of stripping can be realized decrease temperature and pressure after through 10 grades of flash-pot flash distillations.The 8th～10 grade of flash-pot temperature is between 150～105 ℃, and according to easy the to be molten characteristics of seston, what adds proper at this.Under the situation that guarantees enough dissolution times, directly aluminium hydroxide seston slurries are squeezed into the stripping pit with pump and enter the stripping that dilution system also can be realized seston.The causticity ratio of mentioning in the inventive method refers to the molecular ratio of caustic alkali and aluminum oxide in the sodium aluminate solution.
Embodiment 1
According to the aluminium hydroxide seston of production process amount what, be modulated into slurries with decomposition nut liquid or alumina producing system washing lotion, be 500～1000g/L admittedly contain, calculate flow; Design, produce surge tank, preheating pipe length and progression, relevant device etc. then, relevant devices such as seston preheating pipe and one group of Bayer process self-evaporatint n. system are coupled together.
Seston slurries after modulation are with being pumped into 2～3 grades of pipeline preheaters, use secondary steam that the seston slurries are preheated to 105～150 ℃ from corresponding flash-pot, enter the 8th～10 grade of flash-pot then, with original diaspore dissolved mineral slurry, stripping on one side, on one side flash distillation.Enter seminal fluid causticity after dilution, the desiliconization than reduction by 1%～8% through the ore pulp that comes out of level flash-pot not.
Embodiment 2:,
According to aluminium hydroxide seston amount in producer's process what, be modulated into slurries with decomposition nut liquid or alumina producing system washing lotion, be 500～1000g/L admittedly contain, calculate flow; Design, make pipeline and relevant device then, and couple together with one group of dilution system.
Seston slurries after modulation after stripping, enter dilution trap with being pumped into the stripping pit with original diaspore dissolved mineral slurry.Reduce by 1%～8% through the seminal fluid causticity ratio after the dilution desiliconization.
Claims (4)
1. the method handled of a mother liquor floating material during production of aluminum oxide, its treating processes is the mother liquor that sodium aluminate concentrate solution is obtained after kind of branch or carbon divide, and is modulated into through the aluminium hydroxide seston of filtered and recycled and enters Bayer process self-evaporatint n. system behind the slurries or dilution system carries out stripping; It is characterized in that in the synthetic slurries of described aluminium hydroxide seston that it is 500～1000g/L that the consolidating of seston contains; 105～145 ℃ of slurries preheating temperatures; Slurries pipeline preheat stage number: 2～3 grades; Slurries pipeline preheating steam, the secondary vapour of the corresponding flash-pot flash distillation of use temperature.
2. the method that a kind of mother liquor floating material during production of aluminum oxide according to claim 1 is handled is characterized in that described aluminium hydroxide seston is with decomposition nut liquid or alumina producing system washing lotion modulation slurries.
3. the method that a kind of mother liquor floating material during production of aluminum oxide according to claim 1 is handled, it is characterized in that described aluminium hydroxide seston slurries squeeze into the pipeline pre-heating system with pump and enter Bayer process self-evaporatint n. system after preheating, or directly squeeze into the Bayer process dilution system with pump.
4. the method that a kind of mother liquor floating material during production of aluminum oxide according to claim 1 is handled is characterized in that the slurries dissolution time that described aluminium hydroxide seston is modulated into is 5～10 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101796390A CN100572280C (en) | 2007-12-17 | 2007-12-17 | The method that a kind of mother liquor floating material during production of aluminum oxide is handled |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101796390A CN100572280C (en) | 2007-12-17 | 2007-12-17 | The method that a kind of mother liquor floating material during production of aluminum oxide is handled |
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| Publication Number | Publication Date |
|---|---|
| CN101182023A CN101182023A (en) | 2008-05-21 |
| CN100572280C true CN100572280C (en) | 2009-12-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2007101796390A Active CN100572280C (en) | 2007-12-17 | 2007-12-17 | The method that a kind of mother liquor floating material during production of aluminum oxide is handled |
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| CN (1) | CN100572280C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102432048A (en) * | 2010-09-29 | 2012-05-02 | 中国铝业股份有限公司 | Ingredient mother liquid floating object recovery method |
| CN113912096B (en) * | 2021-10-22 | 2023-07-11 | 中铝矿业有限公司 | Bayer process seed precipitation mother liquor oxalate removal process |
| CN115612864A (en) * | 2022-11-10 | 2023-01-17 | 中铝矿业有限公司 | Process for reducing content of suspended matters in metal gallium adsorption mother liquor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1389401A (en) * | 2002-07-23 | 2003-01-08 | 中国铝业股份有限公司 | Mother liquor processing process in alumina production with monohydrated bauxite |
| CN1562754A (en) * | 2004-04-08 | 2005-01-12 | 中国铝业股份有限公司 | Method for treating suspended matter in fabricating alumina |
| CN1631783A (en) * | 2004-12-28 | 2005-06-29 | 中国铝业股份有限公司 | Combined method for producing alumina to decrease alpha k of Bayer process concentrated liquid |
-
2007
- 2007-12-17 CN CNB2007101796390A patent/CN100572280C/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1389401A (en) * | 2002-07-23 | 2003-01-08 | 中国铝业股份有限公司 | Mother liquor processing process in alumina production with monohydrated bauxite |
| CN1562754A (en) * | 2004-04-08 | 2005-01-12 | 中国铝业股份有限公司 | Method for treating suspended matter in fabricating alumina |
| CN1631783A (en) * | 2004-12-28 | 2005-06-29 | 中国铝业股份有限公司 | Combined method for producing alumina to decrease alpha k of Bayer process concentrated liquid |
Non-Patent Citations (2)
| Title |
|---|
| Al(OH)3浮游物对氧化铝生产的影响及应对措施. 山西铝厂，师树英，史青菊.有色金属，第5期. 2002 |
| Al(OH)3浮游物对氧化铝生产的影响及应对措施. 山西铝厂，师树英，史青菊.有色金属，第5期. 2002 * |
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| CN101182023A (en) | 2008-05-21 |
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