CN101117226A - Method for expelling carbonate in production of aluminum oxide - Google Patents
Method for expelling carbonate in production of aluminum oxide Download PDFInfo
- Publication number
- CN101117226A CN101117226A CNA2007101186648A CN200710118664A CN101117226A CN 101117226 A CN101117226 A CN 101117226A CN A2007101186648 A CNA2007101186648 A CN A2007101186648A CN 200710118664 A CN200710118664 A CN 200710118664A CN 101117226 A CN101117226 A CN 101117226A
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- Prior art keywords
- aluminum oxide
- carbonate
- liquid
- subsider
- evaporation
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 41
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 title claims abstract description 25
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 title claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 29
- 239000003513 alkali Substances 0.000 claims abstract description 27
- 150000003839 salts Chemical class 0.000 claims abstract description 23
- 238000004131 Bayer process Methods 0.000 claims abstract description 17
- 238000001704 evaporation Methods 0.000 claims abstract description 16
- 230000008020 evaporation Effects 0.000 claims abstract description 16
- 239000012452 mother liquor Substances 0.000 claims abstract description 14
- 239000007787 solid Substances 0.000 claims abstract description 9
- 238000005245 sintering Methods 0.000 claims abstract description 8
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 60
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 21
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 15
- 239000012065 filter cake Substances 0.000 claims description 7
- 239000000706 filtrate Substances 0.000 claims description 4
- 238000004062 sedimentation Methods 0.000 claims description 4
- 239000007791 liquid phase Substances 0.000 claims description 2
- 239000007790 solid phase Substances 0.000 claims description 2
- 239000000243 solution Substances 0.000 abstract description 22
- 239000003518 caustics Substances 0.000 abstract description 11
- 239000011734 sodium Substances 0.000 abstract description 8
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 abstract description 6
- 238000000926 separation method Methods 0.000 abstract description 6
- 229910052708 sodium Inorganic materials 0.000 abstract description 6
- 238000002425 crystallisation Methods 0.000 abstract description 4
- 230000008025 crystallization Effects 0.000 abstract description 4
- 238000009993 causticizing Methods 0.000 abstract description 3
- 239000010413 mother solution Substances 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 239000011550 stock solution Substances 0.000 abstract 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 29
- 235000017550 sodium carbonate Nutrition 0.000 description 14
- 229910000029 sodium carbonate Inorganic materials 0.000 description 14
- 239000013078 crystal Substances 0.000 description 7
- 230000008016 vaporization Effects 0.000 description 7
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 description 4
- 229910001388 sodium aluminate Inorganic materials 0.000 description 4
- 239000006200 vaporizer Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910001570 bauxite Inorganic materials 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 229910021502 aluminium hydroxide Inorganic materials 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000007701 flash-distillation Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
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- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention relates to a method to exclude carbonate in the production process of aluminum oxide, which relates to a technological method producing aluminum oxide with the Bayer process. The method is characterized in that: the liquid caustic which is required in the production process of aluminum oxide with the Bayer process is directly added into the salt draining settling tank, the settled bottom stream is solid-liquid separated into carbonate and the evaporation alkali liquor; the solid obtained by the separation is dealt with the causticizing process or the sintering process to produce aluminum oxide; the liquor obtained by the separation and the overflow of the settling tank are added into the mother liquor tank together, and then is circularly lye allocated. By using the invention, the liquid caustic with normal temperature high caustic sodium concentration is added into the salt draining settling tank, the temperature of the solution in the settling tank is reduced, the caustic sodium concentration of the solution is improved, and the separating speed for the carbonate crystallization is accelerated. The liquid caustic, the overflow of the settling tank and the evaporation mother liquor are mixed into the mother liquor tank, and during the circular lye allocation, only the flow of the evaporation stock solution and the mixed mother solution is calculated and regulated, ,the technological process by using the circular lye allocation with the Bayer process is simplified, the operation of the lye allocation is more convenient and exact.
Description
Technical field
The method of expelling carbonate in a kind of alumina producing relates to a kind of processing method of alumina producing Bayer process.
Background technology
NaO in the alumina producing in the sodium aluminate solution comprises sodium hydroxide (being commonly called as caustic alkali) NaOH, yellow soda ash (being commonly called as carbon alkali) Na
2CO
3, sodium sulfate Na
2SO
4Deng.For alumina producing Bayer process, have only the aluminum oxide in the OH-energy stripping bauxite among the NaOH to obtain sodium aluminate solution, and yellow soda ash not only increases the circulating fluid volume of system, and can cause solution to separate out blocking pipe in the flash vaporization process crystallization of evaporation or stripping, can cause Production Flow Chart to interrupt when serious.
Because the anti-causticizing reaction and the solution of the bringing into of raw materials for production such as bauxite and lime, process in leaching are brought airborne CO at course of conveying
2Etc. reason, the carbonate content in the flow process is constantly raise.Therefore, special salt discharge operation to be set to reduce the content of system's carbon alkali in the Bayer process production technique.In the production, usually take by the mother liquid concentration after the decomposition of forced circulation evaporation raising sodium aluminate solution, to improve the degree of supersaturation of yellow soda ash, then the sodium aluminate solution of high density is sent in the salt discharge subsider, after reducing solution temperature, thereby crystallize sodium carbonate is separated out because the equilibrium concentration of yellow soda ash reduces, crystals of sodium carbonate enters rotary drum filter by salt discharge subsider underflow and carries out liquid-solid separation, and filtering filter cake is that crystallize sodium carbonate carries out returning the Bayer process flow process or sending sintering process to produce aluminum oxide behind the causticizing reaction.But, when crystal grain becomes big, be difficult to be adsorbed onto on the filter cloth filter effect variation of rotary drum filter because the crystals of sodium carbonate particle changes with working condition.
On January 12nd, 2005, open application number was the patent of 200410022211.1 " a kind of methods of separation of oxygenated aluminum evaporation mother liquor yellow soda ash ", this application case is that the mother liquid evaporation of decomposing solution behind vaporizer that will decompose aluminium hydroxide enters and separate yellow soda ash in the bag filter, and this techniqueflow is simple, easy and simple to handle.Solution temperature was higher when its weak point was that mother liquid evaporation directly enters bag filter, and the crystallization amount of separating out of carbonate is less, causes a large amount of yellow soda ash still to stay in the solution salt discharge weak effect.
On November 22nd, 2006, disclosed application number was 200510200285.4, the patented invention name is called the method for removing of carbonate in the alumina producing, propose a kind of in the salt discharge process of pump circulation salt discharge vaporizer or flash distillation, adding an amount of carbonate crystal seed and the caustic alkali of high density, is sedimentation and the good anhydrous sodium carbonate of strainability thereby reach the salt that improves salt discharge efficient and make eliminating most of.The deficiency of this technology is to have increased carbonate crystal seed flow process, makes Production Flow Chart complicated; Because the carbonate crystal seed adds in pump circulation salt discharge vaporizer or the flash drum, the load of pump feed evaporator will be increased in addition.
In process of production, because part caustic alkali NaOH reaction forms sodium white residue NaOAl
2O
31.7SiO
2NH
2O enters red mud and is excluded flow process, and other losses, therefore needs to replenish the NaOH that is consumed, promptly so-called alumina producing Bayer process " benefit alkali ".Usually Bayer process is mended the method for alkali, is on request liquid caustic soda directly to be joined in the circulation alkali liquor when the alkali liquor preparing circulation alkali liquor.In the production operation, carry out the flow proportional that vaporizing raw liquor, mother liquid evaporation and three kinds of solution of liquid caustic soda will be calculated and adjust to the circulation alkali liquor allotment, the production control difficulty is bigger.
Summary of the invention
The objective of the invention is the deficiency that exists at above-mentioned prior art, a kind of technical process that can effectively simplify the allotment of Bayer process circulation alkali liquor is provided, makes the method for expelling carbonate in the alumina producing that alkali liquor preparing is more convenient to operate accurately, filter cake attached liquid amount is little, salt discharge efficient is high.
The objective of the invention is to be achieved through the following technical solutions.
The method of expelling carbonate in a kind of alumina producing is characterized in that required additional liquid caustic soda in the Bayer process aluminum oxide production process directly is added in the salt discharge subsider, the sedimentation underflow is carried out carbonate separate with evaporation the liquid-solid of alkali lye; Isolate solid phase and carry out the causticization processing or send sintering process to produce aluminum oxide, isolating liquid phase and subsider overflow are carried out the circulation alkali liquor allotment after together going into mother liquor tank.
The method of expelling carbonate in a kind of alumina producing of the present invention is characterized in that salt discharge subsider underflow is that to adopt band filter to carry out liquid-solid isolating, and the logical subsider overflow of filter filtrate together enters the mother liquid evaporation groove, and then removes to allocate circulation alkali liquor; Filter cake carries out causticization and handles or send sintering process production aluminum oxide.
Method of the present invention directly is added to the liquid caustic soda that is replenished in the Bayer process production process in the salt discharge subsider, and the subsider underflow adopts horizontal belt filter to carry out carbonate and the liquid-solid of solution separates.The liquid caustic soda of the high caustic sodium concentration of normal temperature adds in the salt discharge subsider, helps reducing the temperature of subsider solution, improves the caustic sodium concentration of solution, thereby improves the degree of supersaturation of carbonate, accelerates the speed of separating out of carbonate crystallization.Adopt band filter to be fit to handle oarse-grained carbonate, filter cake attached liquid amount is little, salt discharge efficient height.The present invention makes liquid caustic soda, the overflow of salt discharge subsider and mother liquid evaporation be mixed into mother liquor tank, when circulation alkali liquor is allocated, only need to calculate and regulation and control vaporizing raw liquor and the flow that mixes mother liquor, simplified the technical process of Bayer process circulation alkali liquor allotment, make alkali liquor preparing more convenient to operate accurately.
Description of drawings
Fig. 1 is the process flow sheet of alumina producing expelling carbonate.
Embodiment
The method of expelling carbonate in a kind of alumina producing, its process is to replenish the liquid caustic soda of Bayer process system and the mother liquor of process pump feed evaporator, by being pumped in the salt discharge subsider, the underflow of subsider adopts band filter to carry out liquid-solid separation, filtrate and subsider overflow together enter overflow groove, carry out the allotment operation of circulation alkali liquor in proportion by liquid caustic soda, subsider overflow, the mixed mother liquor of mother liquid evaporation and vaporizing raw liquor; Filter cake is handled or is returned sintering process through causticization and produces aluminum oxide.Because the liquid caustic soda of normal temperature high density adds in the salt discharge subsider, the temperature of subsider and the caustic sodium concentration of its solution of raising can be reduced, thereby the equilibrium concentration of yellow soda ash can be reduced, increase the amount of separating out of crystals of sodium carbonate.
One alumina producing Bayer process annual production is 800,000 tons a production line, and it is 130m that its vaporizer pump circulation effect is per hour advanced salt discharge subsider flow
3/ h, the temperature of subsider is 102 ℃, Nk concentration is 310g/l.The liquid caustic soda of replenishment system is pressed 15m
3After/h added subsider, the temperature of subsider dropped to 97 ℃, and Nk concentration can be brought up to 325g/l, because solution temperature reduces and the raising of Nk concentration, the equilibrium concentration of solution yellow soda ash was reduced.The underflow of sedimentation underflow subsider adopts the belt filter of 1.2 * 25m to carry out liquid-solid separation, after filtrate and subsider overflow together enter overflow groove, with pumping circulation alkali lye mother liquor tank, by liquid caustic soda, subsider overflow and the mixed mother liquor of mother liquid evaporation, carry out the allotment of circulation alkali liquor in proportion with vaporizing raw liquor, allocate because alkali liquor preparing by former liquid caustic soda, mother liquor and three kinds of preparing solutions of vaporizing raw liquor, changes into by mother liquor and two kinds of solution of vaporizing raw liquor, allotment is calculated simple, and is easy and simple to handle.The filter cake part of band filter is handled through causticization and is returned the Bayer process flow process, and a part is used the slurry blending of pumping sintering process system after the carbon mother liquid dilution.
Claims (2)
1. the method for expelling carbonate in the alumina producing is characterized in that required additional liquid caustic soda in the Bayer process aluminum oxide production process directly is added in the salt discharge subsider, the sedimentation underflow is carried out carbonate separate with evaporation the liquid-solid of alkali lye; Isolated solid phase is carried out causticization and is handled or send sintering process production aluminum oxide, and isolating liquid phase and subsider overflow are carried out the circulation alkali liquor allotment after together going into mother liquor tank.
2. the method for expelling carbonate in a kind of alumina producing according to claim 1, it is characterized in that salt discharge subsider underflow is to adopt band filter to carry out liquid-solid isolating, filter filtrate together enters the mother liquid evaporation groove with the subsider overflow, and then removes to allocate circulation alkali liquor; Filter cake carries out causticization and handles or send sintering process production aluminum oxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101186648A CN100572278C (en) | 2007-07-12 | 2007-07-12 | The method of expelling carbonate in a kind of alumina producing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101186648A CN100572278C (en) | 2007-07-12 | 2007-07-12 | The method of expelling carbonate in a kind of alumina producing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101117226A true CN101117226A (en) | 2008-02-06 |
| CN100572278C CN100572278C (en) | 2009-12-23 |
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| CN (1) | CN100572278C (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101264910B (en) * | 2008-04-25 | 2010-10-13 | 河南未来铝业（集团）有限公司 | Mother liquor evaporation seed addition method for aluminum hydroxide or aluminum oxide production technique by Bayer process |
| CN102491387A (en) * | 2011-11-24 | 2012-06-13 | 中国铝业股份有限公司 | Method for eliminating alkali carbonate crystal coarsening phenomenon |
| CN103043693A (en) * | 2013-01-17 | 2013-04-17 | 信发集团有限公司 | Bayer-method-based aluminum oxide production system using carbide slag instead of lime |
| CN104743586A (en) * | 2013-12-27 | 2015-07-01 | 中国科学院过程工程研究所 | Joint production method of alkali leaching of aluminium in Bayer red mud and aluminium oxide decomposed mother liquid evaporation for salt elimination |
| CN105016365A (en) * | 2015-07-24 | 2015-11-04 | 中国铝业股份有限公司 | Salt discharging system and method in Bayer-process aluminium oxide production process |
| CN111252790A (en) * | 2020-03-16 | 2020-06-09 | 中国铝业股份有限公司 | Improved method for evaporation and salting-out process of Bayer process high-carbon alkali solution |
| CN113247925A (en) * | 2021-04-13 | 2021-08-13 | 广西田东锦鑫化工有限公司 | Process for reducing hydrolysis loss of alumina |
| CN113912093A (en) * | 2021-09-29 | 2022-01-11 | 靖西天桂铝业有限公司 | Method for thickening evaporation mother liquor and discharging sodium carbonate salt in aluminum oxide production |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107758710A (en) * | 2016-08-18 | 2018-03-06 | 沈阳铝镁设计研究院有限公司 | Carbonate discharge method and device in a kind of aluminum oxide production process |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1386328A (en) * | 1963-11-19 | 1965-01-22 | Pechiney Prod Chimiques Sa | Improvements to the regeneration of residual sodium hydroxide solution from the alumina preparation |
| US3508884A (en) * | 1967-02-03 | 1970-04-28 | Alcan Res & Dev | Removal of sodium carbonate and sodium sulfate from bayer solutions |
| AUPP933499A0 (en) * | 1999-03-19 | 1999-04-15 | Worsley Alumina Pty Ltd | Process for the removal of oxalate and/or sulphate from bayer liquors |
| CN100450931C (en) * | 2005-05-18 | 2009-01-14 | 贵阳铝镁设计研究院 | Carbonate-removing method in alumina production |
-
2007
- 2007-07-12 CN CNB2007101186648A patent/CN100572278C/en active Active
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101264910B (en) * | 2008-04-25 | 2010-10-13 | 河南未来铝业（集团）有限公司 | Mother liquor evaporation seed addition method for aluminum hydroxide or aluminum oxide production technique by Bayer process |
| CN102491387A (en) * | 2011-11-24 | 2012-06-13 | 中国铝业股份有限公司 | Method for eliminating alkali carbonate crystal coarsening phenomenon |
| CN103043693A (en) * | 2013-01-17 | 2013-04-17 | 信发集团有限公司 | Bayer-method-based aluminum oxide production system using carbide slag instead of lime |
| CN103043693B (en) * | 2013-01-17 | 2015-03-18 | 信发集团有限公司 | Bayer-method-based aluminum oxide production system using carbide slag instead of lime |
| CN104743586A (en) * | 2013-12-27 | 2015-07-01 | 中国科学院过程工程研究所 | Joint production method of alkali leaching of aluminium in Bayer red mud and aluminium oxide decomposed mother liquid evaporation for salt elimination |
| CN104743586B (en) * | 2013-12-27 | 2017-11-14 | 中国科学院过程工程研究所 | The combine production method of the leaching of aluminium alkali and alumina decomposition mother liquid evaporation salt discharge in a kind of Bayer process red mud |
| CN105016365A (en) * | 2015-07-24 | 2015-11-04 | 中国铝业股份有限公司 | Salt discharging system and method in Bayer-process aluminium oxide production process |
| CN111252790A (en) * | 2020-03-16 | 2020-06-09 | 中国铝业股份有限公司 | Improved method for evaporation and salting-out process of Bayer process high-carbon alkali solution |
| CN113247925A (en) * | 2021-04-13 | 2021-08-13 | 广西田东锦鑫化工有限公司 | Process for reducing hydrolysis loss of alumina |
| CN113247925B (en) * | 2021-04-13 | 2022-11-01 | 广西田东锦鑫化工有限公司 | Process for reducing hydrolysis loss of alumina |
| CN113912093A (en) * | 2021-09-29 | 2022-01-11 | 靖西天桂铝业有限公司 | Method for thickening evaporation mother liquor and discharging sodium carbonate salt in aluminum oxide production |
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Effective date of registration: 20170524 Address after: Qixian town Henan province 454171 Xiuwu County of Zhongzhou aluminum plant Patentee after: Chalco Zhongzhou Aluminium Industry Co., Ltd. Address before: 100814, Haidian District, Fuxing Road, Beijing No. 12, China Aluminum Limited by Share Ltd Patentee before: Aluminum Corporation of China Limited |
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