CN101234771A - Mother liquid evaporation desalting technique in aluminum oxide production - Google Patents
Mother liquid evaporation desalting technique in aluminum oxide production Download PDFInfo
- Publication number
- CN101234771A CN101234771A CNA2007100776281A CN200710077628A CN101234771A CN 101234771 A CN101234771 A CN 101234771A CN A2007100776281 A CNA2007100776281 A CN A2007100776281A CN 200710077628 A CN200710077628 A CN 200710077628A CN 101234771 A CN101234771 A CN 101234771A
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- China
- Prior art keywords
- filter
- mother liquid
- liquid evaporation
- sent
- horizontal belt
- Prior art date
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000001704 evaporation Methods 0.000 title claims abstract description 18
- 230000008020 evaporation Effects 0.000 title claims abstract description 18
- 239000007788 liquid Substances 0.000 title claims description 12
- 238000011033 desalting Methods 0.000 title claims description 7
- 238000004519 manufacturing process Methods 0.000 title description 9
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 title description 2
- 239000004744 fabric Substances 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000012065 filter cake Substances 0.000 claims abstract description 16
- 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 9
- 238000001914 filtration Methods 0.000 claims abstract description 7
- 238000005245 sintering Methods 0.000 claims abstract description 7
- 239000003513 alkali Substances 0.000 claims abstract description 5
- 239000000706 filtrate Substances 0.000 claims abstract description 4
- 239000002002 slurry Substances 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 238000001556 precipitation Methods 0.000 claims description 6
- 238000004062 sedimentation Methods 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 6
- 238000007654 immersion Methods 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 abstract description 7
- 150000003839 salts Chemical class 0.000 abstract description 4
- 238000002425 crystallisation Methods 0.000 abstract description 2
- 230000008025 crystallization Effects 0.000 abstract description 2
- 239000012452 mother liquor Substances 0.000 abstract 3
- 238000007599 discharging Methods 0.000 abstract 1
- 230000008929 regeneration Effects 0.000 description 8
- 238000011069 regeneration method Methods 0.000 description 8
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- 235000017550 sodium carbonate Nutrition 0.000 description 2
- 239000003518 caustics Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
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- Manufacture And Refinement Of Metals (AREA)
- Filtration Of Liquid (AREA)
Abstract
The invention discloses a process for excluding salt of evaporation mother liquor in producing alumina; the evaporated evaporation mother liquor is sent to a settling tank; settling overflow is sent to a burden process; settling underflow is sent to a horizontal belt filter; after being filtered, filtrate is sent to the burden process; filter cake is used for preparing alkali red mud slurry by a sintering process. Compared with the prior art, the process for excluding the salt of the evaporation mother liquor has the advantages that productivity is greatly improved; water content of the filter is low; when crystallization of carbonate is modified (granularity becomes coarse), filtration and discharging of the carbonate is not affected and filter cloth of a filter is not easy to run deviation, thus lessening labor intensity of operators.
Description
Technical field:
The present invention relates to a kind of alumina producing evaporization process yellow soda ash filtration process
Background technology:
In present aluminum oxide production process, be used for kind of the filter of branch mother liquid evaporation salt discharge (yellow soda ash), generally all adopt drum type vacuum filter, but being used to clean the seed precipitation solution or the water that add during the low and filter cloth regeneration owing to this filter production capacity (filter cloth is used after cleaning again) mixes and can't separate with the carbonate filter cake, cause cake moisture to increase, concentration reduces, and is unfavorable for producing (sending the sintering process batching); When carbonate generation change of properties (granularity chap), be difficult for being filtered (because coarse size, vacuum suck does not go up); The easy sideslip of filter cloth, labor intensity of operating staff is big.Therefore, adopt drum type vacuum filter to be used for kind of the salt discharge of branch mother liquid evaporation, the requirement of the current alumina producing that has been far from suitable.
Summary of the invention:
The objective of the invention is:
Under the prerequisite that does not influence process for making alumina, a kind of production capacity height is provided, filter cake moisture content is low, labour intensity is low and can adapts to the mother liquid evaporation desalting technique of carbonate sex change.
The particular content of this new technology is:
Mother liquid evaporation after evaporation is sent into subsider, sedimentation overflow delivery material process, and the sedimentation underflow is sent into horizontal belt filter, and after filtering, filtrate delivery material process, filter cake are used to prepare sintering process alkali red mud slurry.
The part material of filter has been made special requirement, and the filter frame adopts stainless steel, to prolong the work-ing life of equipment.Because the not corrosion of anti-caustic alkali of aluminium alloy, the gas collection cylinder of filter changes steel design into by original aluminium alloy.The compressed air pipe of filter changes steel pipe into by rubber hose, and has increased gas holder, fluctuates with steady pressure.
Because the filter cloth of horizontal belt filter is closed circulation, in its working cycle, wash at no filter cake adding seed precipitation solution or hot water, make filter cloth regeneration.Like this, both guaranteed that the regeneration of filter cloth was used, and allowed filter cloth regeneration water not mix again, thereby reduced the water ratio of filter cake with filter cake.And wash water can use repeatedly, when its concentration reaches 50～80g/l, renews water or new seed precipitation solution washs.
The washing methods that the filter cloth of horizontal belt filter can adopt the filter cloth of horizontal belt filter to adopt the water spray washing to combine with the tank immersion type.Earlier filter cloth is sprayed, it is immersed in the tank wash again, thereby guaranteed the filter cloth air permeability and good, for the production capacity that improves filter has been created good condition.
The present invention compared with prior art has following advantage:
1, the filter production capacity significantly improves, and original 1 filtration area is 30m
2Drum type vacuum filter, production capacity has only 8～9 tons/hour, and transforms back 1 24m
2The production capacity of horizontal belt filter is more than 16 tons.
2, when carbonate crystallization sex change (granularity chap), the filtration that does not influence carbonate is discharged.
3, filter cake moisture content is low, and generally 30% with interior (the drum type vacuum filter filter cake moisture content is generally more than 30%), the filter cloth regeneration water does not mix with filter cake simultaneously.Help the sintering process batching, reduced charge pulp moisture, thereby reduced the raw material sintering energy consumption.
4, filter cloth is difficult for sideslip, thereby has alleviated labor intensity of operating personnel.
Description of drawings:
Accompanying drawing 1 is process flow sheet of the present invention.
Embodiment:
Embodiments of the invention:
Mother liquid evaporation after evaporation is sent into subsider, sedimentation overflow delivery material process, and the sedimentation underflow is sent into horizontal belt filter, and after filtering, filtrate delivery material process, filter cake are used to prepare sintering process alkali red mud slurry.
The part material of filter has been made special requirement, and the filter frame adopts stainless steel, and the gas collection cylinder of filter adopts steel design, and the compressed air pipe of filter adopts steel pipe.
Because the filter cloth of horizontal belt filter is closed circulation, in its working cycle, wash at no filter cake adding seed precipitation solution or hot water, make filter cloth regeneration.Like this, both guaranteed that the regeneration of filter cloth was used, and allowed filter cloth regeneration water not mix again, thereby reduced the water ratio of filter cake with filter cake.And wash water can use repeatedly, when its concentration reaches 50～80g/l, renews water or new seed precipitation solution washs.
The washing methods that the filter cloth of horizontal belt filter adopts the filter cloth of horizontal belt filter to adopt the water spray washing to combine with the tank immersion type.Earlier filter cloth is sprayed, it is immersed in the tank wash again, thereby guaranteed the filter cloth air permeability and good, for the production capacity that improves filter has been created good condition.
Claims (4)
1. the mother liquid evaporation desalting technique in the alumina producing, it is characterized in that: the mother liquid evaporation after evaporation is sent into subsider, sedimentation overflow delivery material process, the sedimentation underflow is sent into horizontal belt filter, after filtering, filtrate delivery material process, filter cake are used to prepare sintering process alkali red mud slurry.
2. the mother liquid evaporation desalting technique in the alumina producing according to claim 1 is characterized in that: the filter frame adopts stainless steel, and the gas collection cylinder of filter adopts steel design, and the compressed air pipe of filter adopts steel pipe.
3. the mother liquid evaporation desalting technique in the alumina producing according to claim 1 and 2 is characterized in that: the filter cloth of horizontal belt filter washes at no filter cake adding seed precipitation solution or hot water in working cycle, and wash water can use repeatedly.
4. the mother liquid evaporation desalting technique in the alumina producing according to claim 3 is characterized in that: the washing methods that the filter cloth of horizontal belt filter adopts the water spray washing to combine with the tank immersion type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100776281A CN101234771A (en) | 2007-01-31 | 2007-01-31 | Mother liquid evaporation desalting technique in aluminum oxide production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100776281A CN101234771A (en) | 2007-01-31 | 2007-01-31 | Mother liquid evaporation desalting technique in aluminum oxide production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101234771A true CN101234771A (en) | 2008-08-06 |
Family
ID=39918714
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007100776281A Pending CN101234771A (en) | 2007-01-31 | 2007-01-31 | Mother liquid evaporation desalting technique in aluminum oxide production |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101234771A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102107892A (en) * | 2009-12-23 | 2011-06-29 | 中国铝业股份有限公司 | Sulfur discharging method for using high-sulfur bauxite ore in mixed combination method |
| CN102107897A (en) * | 2009-12-23 | 2011-06-29 | 中国铝业股份有限公司 | Method for controlling precipitation of crystal alkali in evaporator |
| CN103130256A (en) * | 2011-12-05 | 2013-06-05 | 贵阳铝镁设计研究院有限公司 | Dissolving self-evaporation process |
| CN106830027A (en) * | 2017-02-20 | 2017-06-13 | 中国铝业股份有限公司 | A kind of Salt discharge method in Bayer process alumina producing |
| 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 |
-
2007
- 2007-01-31 CN CNA2007100776281A patent/CN101234771A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102107892A (en) * | 2009-12-23 | 2011-06-29 | 中国铝业股份有限公司 | Sulfur discharging method for using high-sulfur bauxite ore in mixed combination method |
| CN102107897A (en) * | 2009-12-23 | 2011-06-29 | 中国铝业股份有限公司 | Method for controlling precipitation of crystal alkali in evaporator |
| CN102107897B (en) * | 2009-12-23 | 2014-08-13 | 中国铝业股份有限公司 | Method for controlling precipitation of crystal alkali in evaporator |
| CN102107892B (en) * | 2009-12-23 | 2014-09-03 | 中国铝业股份有限公司 | Sulfur discharging method for using high-sulfur bauxite ore in mixed combination method |
| CN103130256A (en) * | 2011-12-05 | 2013-06-05 | 贵阳铝镁设计研究院有限公司 | Dissolving self-evaporation process |
| 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 |
| CN106830027A (en) * | 2017-02-20 | 2017-06-13 | 中国铝业股份有限公司 | A kind of Salt discharge method in Bayer process alumina producing |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20080806 |