CN1307105C - Method for separating alumina and vaporizing sodium carbonate in mother liquor - Google Patents
Method for separating alumina and vaporizing sodium carbonate in mother liquor Download PDFInfo
- Publication number
- CN1307105C CN1307105C CNB2004100222111A CN200410022211A CN1307105C CN 1307105 C CN1307105 C CN 1307105C CN B2004100222111 A CNB2004100222111 A CN B2004100222111A CN 200410022211 A CN200410022211 A CN 200410022211A CN 1307105 C CN1307105 C CN 1307105C
- Authority
- CN
- China
- Prior art keywords
- separation
- soda ash
- yellow soda
- filter
- bag filter
- 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.)
- Expired - Lifetime
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- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 title claims abstract description 68
- 229910000029 sodium carbonate Inorganic materials 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000012452 mother liquor Substances 0.000 title claims description 9
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title abstract description 5
- 230000008016 vaporization Effects 0.000 title 1
- 238000001704 evaporation Methods 0.000 claims abstract description 20
- 230000008020 evaporation Effects 0.000 claims abstract description 20
- 238000000926 separation method Methods 0.000 claims abstract description 20
- 239000012065 filter cake Substances 0.000 claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 13
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims abstract description 8
- 229910021502 aluminium hydroxide Inorganic materials 0.000 claims abstract description 7
- 235000017550 sodium carbonate Nutrition 0.000 claims description 29
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 18
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 7
- 238000005245 sintering Methods 0.000 claims description 7
- 239000000706 filtrate Substances 0.000 claims description 6
- 229910001570 bauxite Inorganic materials 0.000 claims description 5
- 239000006200 vaporizer Substances 0.000 claims description 5
- 239000012530 fluid Substances 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 4
- 238000011010 flushing procedure Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 7
- 238000002425 crystallisation Methods 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000000354 decomposition reaction Methods 0.000 abstract description 3
- 239000007787 solid Substances 0.000 abstract description 3
- 238000004062 sedimentation Methods 0.000 abstract 2
- 230000008025 crystallization Effects 0.000 description 5
- 239000012141 concentrate Substances 0.000 description 3
- 238000004131 Bayer process Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229910001388 sodium aluminate Inorganic materials 0.000 description 1
- 235000011121 sodium hydroxide Nutrition 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
Abstract
The present invention discloses a method for separating sodium carbonate in evaporation mother liquid of alumina. Decomposition solution used for decomposing aluminium hydroxide during the alumina production enters an evaporator, evaporation mother liquid directly enters a bag filter to separate sodium carbonate, and sodium carbonate filter cakes and filter liquid generated after the separation are obtained after the evaporation mother liquid is separated by the bag filter. In the present invention, the bag filter is directly adopted to realize the separation, and therefore, the existing separation principle is changed, namely that an original method of crystallisation concentration by a sedimentation tank and negative pressure vacuum liquid-solid separation by a circular cylinder drum type vacuum filter is changed into positive pressure sodium carbonate separation, the sedimentation tank and the circular cylinder drum type vacuum filter are eliminated, and therefore, the technological process is greatly simplified, and the separation effect and the operation unfailing performance of the entire separation process are effectively improved. The present invention has the advantages of good separation effect, low operation cost, simple operation and reliable operation performance.
Description
Technical field:
The present invention relates to a kind of method that is used for yellow soda ash in the alumina producing separation of oxygenated aluminum evaporation mother liquor, belong to the technical field of yellow soda ash in the separation of oxygenated aluminum evaporation mother liquor.
Background technology:
At present, in aluminum oxide production process, alumina producing Bayer process commonly used, main processes is to handle bauxite with the solution that contains a large amount of free NaOHs, with stripping wherein aluminum oxide and obtain sodium aluminate solution, and make aluminum oxide in the solution become crystalline aluminum hydroxide with the method that adds decomposition of crystal seed to separate out, its mother liquid evaporation after evaporator evaporation of the mother liquor after the decomposition returns and is used to leach bauxite.Because of the circulation accumulation, usually contain a certain amount of yellow soda ash in the mother liquid evaporation, when yellow soda ash surpasses its equilibrium concentration, it can separate out in solution in crystallization, as the yellow soda ash in the untimely separation mother liquid evaporation, will cause vaporizer, stripping unit and pipeline frequent jams thereof, influence the ordinary production of aluminum oxide.And the main method of existing separation yellow soda ash is to concentrate by the subsider crystallization, its concentrated solution carries out liquid-solid separation with the cylinder drum type vacuum filter, what cylinder drum filter principle of work adopted is that negative pressure vacuumizes, but because the crystallization sex change takes place in yellow soda ash often, the particle alligatoring, the filter cake adsorption effect is bad, and causes the yellow soda ash inferior separating effect, thereby limited the production capacity of filter, what influence was produced normally carries out.
Summary of the invention:
The objective of the invention is: provide a kind of separating effect better, not need the subsider crystallization to concentrate and do not need that negative pressure vacuumizes, the method for yellow soda ash in the separation of oxygenated aluminum evaporation mother liquor of simple to operate, reliable working performance, to overcome the deficiencies in the prior art.
The present invention will be achieved in that when it will produce aluminum oxide that the mother liquid evaporation of decomposing solution after vaporizer comes out that decomposes aluminium hydroxide directly enters and separates yellow soda ash in the bag filter that its mother liquid evaporation promptly obtains the yellow soda ash filter cake and separates the filtrate that is then produced after bag filter separates; And the yellow soda ash filter cake that it is produced after bag filter is separated is directly produced aluminum oxide as sintering process batching, filtrate being used to that its bag filter is produced after separating leached bauxite; Bag filter is being separated batching that yellow soda ash filter cake that the back produced produces aluminum oxide as sintering process when using, can adopt the decomposing solution that decomposes aluminium hydroxide when producing aluminum oxide as washing fluid directly flushing isolated yellow soda ash filter cake from bag filter use as batching to the workshop that produces aluminum oxide with sintering process.
Owing to adopted technique scheme, the present invention directly adopts bag filter to separate, thereby changed existing separation principle, to be the present invention with original subsider crystallization concentrate carries out negative pressure with concentrated solution with the cylinder drum type vacuum filter and vacuumizes liquid-solid isolating method and make into to carry out separating of yellow soda ash with malleation, subsider and cylinder drum type vacuum filter have been cancelled, thereby simplified technological process greatly, improved separating effect and the reliable operation performance that has improved whole separating technology effectively.Therefore the present invention compared with prior art, the present invention has that good separating effect, running cost are lower, simple to operate, the advantage of reliable working performance.The present invention can realize once directly smart filter, can improve automatization level, and its productivity ratio vacuum filter improves 8～10 times, and can eliminate the detrimentally affect to producing effectively.
Embodiment:
Embodiments of the invention: the bag filter that is adopted is that the model of selling on the market is the bag filter off-the-shelf hardware of 2DL7.5 in the present embodiment, when producing aluminum oxide, the decomposing solution that decomposes aluminium hydroxide during with the production aluminum oxide is incorporated in the vaporizer routinely, will the mother liquid evaporation after vaporizer comes out be introduced directly into and separate yellow soda ash in the bag filter, its mother liquid evaporation promptly obtains the yellow soda ash filter cake and separates the filtrate that the back is produced after bag filter separates, adopt the decomposing solution that decomposes aluminium hydroxide when producing aluminum oxide directly to wash isolated yellow soda ash filter cake from bag filter then, this yellow soda ash filter cake that flushes out is directly produced the batching of aluminum oxide as sintering process as washing fluid; Filtrate being used to that is produced after the bag filter separation leached bauxite to get final product.
Claims (3)
1, the method for yellow soda ash in a kind of separation of oxygenated aluminum evaporation mother liquor, it is characterized in that: the mother liquid evaporation of decomposing solution after vaporizer comes out that will decompose aluminium hydroxide when it will produce aluminum oxide directly enters and separates yellow soda ash in the bag filter, and its mother liquid evaporation promptly obtains the yellow soda ash filter cake and separates the filtrate that the back is produced after bag filter separates.
2, the method for yellow soda ash in the separation of oxygenated aluminum evaporation mother liquor according to claim 1, it is characterized in that: the yellow soda ash filter cake that it is produced after bag filter is separated is directly produced aluminum oxide as sintering process batching, filtrate being used to that its bag filter is produced after separating leached bauxite.
3, the method for yellow soda ash in the separation of oxygenated aluminum evaporation mother liquor according to claim 2, it is characterized in that: when the yellow soda ash filter cake that is produced after bag filter is separated is produced the batching use of aluminum oxide as sintering process, adopt the decomposing solution that decomposes aluminium hydroxide when producing aluminum oxide as washing fluid flushing isolated yellow soda ash filter cake from bag filter, the yellow soda ash filter cake that this washing fluid is washed out directly uses as the batching in the workshop that produces aluminum oxide with sintering process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100222111A CN1307105C (en) | 2004-03-31 | 2004-03-31 | Method for separating alumina and vaporizing sodium carbonate in mother liquor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100222111A CN1307105C (en) | 2004-03-31 | 2004-03-31 | Method for separating alumina and vaporizing sodium carbonate in mother liquor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1562757A CN1562757A (en) | 2005-01-12 |
| CN1307105C true CN1307105C (en) | 2007-03-28 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100222111A Expired - Lifetime CN1307105C (en) | 2004-03-31 | 2004-03-31 | Method for separating alumina and vaporizing sodium carbonate in mother liquor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1307105C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100347085C (en) * | 2005-09-28 | 2007-11-07 | 中国铝业股份有限公司 | Sintering process of separating red mud for alumina production |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3508884A (en) * | 1967-02-03 | 1970-04-28 | Alcan Res & Dev | Removal of sodium carbonate and sodium sulfate from bayer solutions |
| CN87101802A (en) * | 1987-03-06 | 1988-09-14 | 任凯 | Improve the method for vaporization efficiency in the alumina producing |
| CN1324765A (en) * | 2000-05-19 | 2001-12-05 | 郑州轻金属研究院 | Alumina producing process with hydraulic duralumin-type bauxite concentrate |
| 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 |
-
2004
- 2004-03-31 CN CNB2004100222111A patent/CN1307105C/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3508884A (en) * | 1967-02-03 | 1970-04-28 | Alcan Res & Dev | Removal of sodium carbonate and sodium sulfate from bayer solutions |
| CN87101802A (en) * | 1987-03-06 | 1988-09-14 | 任凯 | Improve the method for vaporization efficiency in the alumina producing |
| CN1324765A (en) * | 2000-05-19 | 2001-12-05 | 郑州轻金属研究院 | Alumina producing process with hydraulic duralumin-type bauxite concentrate |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1562757A (en) | 2005-01-12 |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20070328 |