CN1267173C - Carbon decomposed mother liquor high concentration crystallization evaporation method - Google Patents
Carbon decomposed mother liquor high concentration crystallization evaporation method Download PDFInfo
- Publication number
- CN1267173C CN1267173C CN 200410037939 CN200410037939A CN1267173C CN 1267173 C CN1267173 C CN 1267173C CN 200410037939 CN200410037939 CN 200410037939 CN 200410037939 A CN200410037939 A CN 200410037939A CN 1267173 C CN1267173 C CN 1267173C
- Authority
- CN
- China
- Prior art keywords
- crystallization
- temperature
- sodium carbonate
- evaporator
- crystallizer
- 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
Links
- 238000002425 crystallisation Methods 0.000 title claims abstract description 25
- 230000008025 crystallization Effects 0.000 title claims abstract description 25
- 238000001704 evaporation Methods 0.000 title claims abstract description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims description 14
- 229910052799 carbon Inorganic materials 0.000 title claims description 14
- 239000012452 mother liquor Substances 0.000 title description 6
- 238000000034 method Methods 0.000 claims abstract description 32
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical class [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 30
- 239000013078 crystal Substances 0.000 claims abstract description 22
- 239000007788 liquid Substances 0.000 claims abstract description 17
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 11
- 239000011552 falling film Substances 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 5
- 230000008020 evaporation Effects 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 6
- 239000002075 main ingredient Substances 0.000 claims description 3
- 239000012141 concentrate Substances 0.000 claims description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 9
- 238000005245 sintering Methods 0.000 abstract description 8
- 238000000926 separation method Methods 0.000 abstract description 3
- 238000000354 decomposition reaction Methods 0.000 abstract description 2
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical group [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 abstract 1
- 230000005484 gravity Effects 0.000 abstract 1
- 239000004615 ingredient Substances 0.000 abstract 1
- 230000020477 pH reduction Effects 0.000 abstract 1
- 229910001388 sodium aluminate Inorganic materials 0.000 abstract 1
- 239000002002 slurry Substances 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 6
- 206010039509 Scab Diseases 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000013058 crude material Substances 0.000 description 3
- 238000009835 boiling Methods 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 208000012639 Balance disease Diseases 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-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
- 230000015572 biosynthetic process Effects 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 210000000582 semen Anatomy 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Landscapes
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The present invention relates to a sintering method for alumina, particularly to a method for evaporating mother liquid generated by acidification decomposition of sodium aluminate which is dissolved when alumyte is sintered. The present invention is characterized in that materials are concentrated by a falling film evaporator and a forced circulation evaporator, the discharge temperature is 110 DEG C +/-3DEG C, 20 to 50m<3>/h of crystal seeds which comprise components of NaCO3. H2O are added to oversaturated sodium carbonate solution whose specific gravity is 1.33, the internal pressure in a self evaporator is-(0.024(+/-)0.04)MPa, the temperature is below 85(+/-)5 DEG C, and a large number of crystals whose principal ingredients are NaCO3. H2O are separated by crystallization; solution passes through a crystallizer whose interior negative pressure is-(0.085(+/-)0.01)MPa, the solution intensely boils in a vacuum state, the temperature is further lowered to 60 to 75 DEG C, the separation quantity of the sodium carbonate crystals is increased, and the quantity of separation by crystallization is controlled from 80 g/l to 200 g/l.
Description
Technical field
A kind of carbon mother liquid high concentration crystallization and evaporation method, the production method, particularly sintering process seminal fluid that relate to a kind of alumina by sintering adopt the method for the mother liquid evaporation of acidifying decomposition technique output.
Background technology
Produce in the alumina technology in sintering process, carbonating is decomposed the output aluminum hydroxide slurry through after the Separation of Solid and Liquid, and mother liquid obtained sending in the evaporimeter by heat exchange, makes to turn back to the further evaporation and concentration of carbon mother liquid raw slurry again and grind system.The method of the concentrated employing of mother liquor is generally to be sent into mother liquor in the evaporimeter, by heat exchange, and heating, temperature raising, evaporation and realize.Carbon mother liquid evaporative concn General N
TBe controlled at 210 ± 10g/l, further improve carbon mother liquid evaporation N
TConcentration will be separated out monohydrated sodium carbonate, causes that evaporimeter scabs, line clogging, makes evaporimeter be difficult to problems such as continous-stable operation.The development of the alumina technology of sintering process production at present develops towards the direction of high alumina content, high A/S grog prescription.Produce new technologies such as alumina technology, process for treating silicon slag as intensified sintering, require the carbon mother liquid concentration height of evaporation, the equilibrium concentration that has surpassed sodium carbonate, and, its concentration requirement increases with the raising of grog alumina content, A/S, otherwise, because the needs of alumina producing soda balance will make raw slurry moisture height, the production capacity of chamotte kiln is reduced, thereby influence the production capacity and the economic benefit of whole sintering process system.
Summary of the invention
Purpose of the present invention is exactly the deficiency that exists at above-mentioned prior art, and a kind of N that can effectively improve the carbon mother liquid evaporation is provided
TValue solves the water content of crude material slurry content height of aluminum oxide production process, a kind of carbon mother liquid high concentration crystallization and evaporation process method of soda balance difficult problem.
The objective of the invention is to be achieved through the following technical solutions.
A kind of carbon mother liquid high concentration crystallization and evaporation process method, comprise the evaporative crystallization technique flow process that adopts falling film evaporator, forced-circulation evaporator, crystallizer to constitute, it is characterized in that: after material process falling film evaporator and forced-circulation evaporator concentrate, at drop temperature 110 ℃ ± 3, proportion is that to add composition in 1.33 the oversaturated mother liquor be NaCO
3H
2O crystal seed, addition than coefficient 0.06-0.16 control, be-0.020 in the flash-pot internal pressure according to seed～-0.028MPa, temperature are under 85 ± 5 ℃, NaCO is separated out in crystallization
3H
2The O crystal; Again through internal pressure be-0.075～-the 0.095MPa crystallizer, solution continues flash and evaporates under vacuum state, temperature further is reduced to 60-75 ℃, makes the increase of the crystals of sodium carbonate amount of separating out, the crystallization amount of separating out controls to 80g/l～200g/l.
Method of the present invention is owing to add an amount of crystal seed, and the crystallization amount of separating out controls to 80g/l～200g/l, adopts flash process, and the feasible sodium carbonate crystal formation of separating out is perfect, more stable, is convenient to separate and carry.And because the crystallization in the carbonic acid mother liquor is to be created on the crystal seed, and crystallization process occurs in the flash chamber, rather than on conveyance conduit between evaporimeter or the evaporation heater pipeline, make that evaporimeter scabs less, not plugging, can increase substantially the concentration of carbon evaporation mother liquor, thereby satisfied high alumina content, high A/S grog prescription sintering process process system soda balance, raw slurry moisture still remains on below 40%, thereby has guaranteed the production capacity of chamotte kiln.Solubility curve according to sodium carbonate is learnt: sodium carbonate increases with temperature rising solubility.Because the significantly reduction of temperature makes the crystals of sodium carbonate amount of separating out increase.Method of the present invention is by improving carbon mother liquid evaporation N
TConcentration solves the soda balance difficulty that occurs in producing, and can make water content of crude material slurry reduce about 4%, water content of crude material slurry ≯ 40%.
The specific embodiment
A kind of carbon mother liquid high concentration crystallization and evaporation process method comprises the evaporative crystallization technique flow process that adopts falling film evaporator, forced-circulation evaporator, crystallizer to constitute.It is characterized in that: after material concentrated through falling film evaporator and forced-circulation evaporator, drop temperature was 110 ℃ ± 3, and proportion is that to add composition in 1.33 the oversaturated sodium carbonate liquor be NaCO
3H
2The O crystal seed, (promptly the crystal seed amount of Tian Jiaing is (with Na than coefficient 0.06-0.16 according to seed for addition
2O meter) with mother liquid evaporation in Na
2O
cRatio) control, be under 85 ± 5 ℃ in the flash-pot internal pressure for-(0.024 ± 0.004) MPa, temperature, it is NaCO that a large amount of Main Ingredients and Appearances are separated out in crystallization
3H
2The O crystal; Through internal pressure be-(0.085 ± 0.01) MPa crystallizer again, solution is acutely boiling under vacuum state, and temperature further is reduced to 60-75 ℃, make the crystals of sodium carbonate amount of separating out increase, and the crystallization amount of separating out controls to 80g/l～200g/l.
Embodiment 1
After material concentrated through falling film evaporator and forced-circulation evaporator, drop temperature was at 97 ℃, and proportion is that to add composition in 1.33 the oversaturated sodium carbonate liquor be NaCO
3H
2The O crystal seed, addition according to seed than coefficient 0.09 control, in the flash-pot internal pressure is-(0.024 ± 0.004) MPa, temperature is under 82 ℃, it is NaCO that a large amount of Main Ingredients and Appearances are separated out in crystallization
3H
2The O crystal; Through internal pressure be-the 0.08MPa crystallizer again, solution is acutely boiling under vacuum state, and temperature further is reduced to 76 ℃, make the crystals of sodium carbonate amount of separating out increase, and the crystallization amount of separating out controls to 80g/l.On the pipeline, make that evaporimeter scabs less, not plugging.
Embodiment 2
Drop temperature is at 110 ℃, and the interpolation composition is NaCO
3H
2The O crystal seed, than coefficient 0.16 control, flash-pot pressure is-0.03MPa 80 ℃ of temperature to addition according to seed; Crystallizing evaporator pressure-0.095MPa, 62 ℃ of temperature, the crystallization amount of separating out controls to 200g/l.On the pipeline, make that evaporimeter scabs less, not plugging.
Embodiment 3
Drop temperature is at 113 ℃, and the interpolation composition is NaCO
3H
2The O crystal seed, than coefficient 0.12 control, flash-pot pressure is-0.025MPa 80 ℃ of temperature to addition according to seed; Crystallizing evaporator pressure-0.09MPa, 71 ℃ of temperature, knot, the crystallization amount of separating out controls to 175g/l.On the pipeline, on the evaporimeter water back, scab less, not plugging.
Claims (1)
1. carbon mother liquid high concentration crystallization and evaporation process method, comprise the evaporative crystallization technique flow process that adopts falling film evaporator, forced-circulation evaporator, crystallizer to constitute, it is characterized in that: after material process falling film evaporator and forced-circulation evaporator concentrate, drop temperature is 110 ℃ ± 3, and proportion is that to add composition in 1.33 the oversaturated sodium carbonate liquor be NaCO
3H
2Than coefficient 0.06-0.16 control, the flash-pot internal pressure is-0.020 according to seed for O crystal seed, addition～-0.028MPa, temperature are under 85 ± 5 ℃, it is NaCO that a large amount of Main Ingredients and Appearances are separated out in crystallization
3H
2The O crystal; Again through internal pressure be-0.075～-the 0.095MPa crystallizer, solution acutely seethes with excitement under vacuum state, temperature further is reduced to 60-75 ℃, makes crystals of sodium carbonate separate out in flash-pot and crystallizer, the crystallization amount of separating out controls to 80g/l～200g/l.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410037939 CN1267173C (en) | 2004-05-14 | 2004-05-14 | Carbon decomposed mother liquor high concentration crystallization evaporation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410037939 CN1267173C (en) | 2004-05-14 | 2004-05-14 | Carbon decomposed mother liquor high concentration crystallization evaporation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1597528A CN1597528A (en) | 2005-03-23 |
| CN1267173C true CN1267173C (en) | 2006-08-02 |
Family
ID=34664424
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410037939 Expired - Lifetime CN1267173C (en) | 2004-05-14 | 2004-05-14 | Carbon decomposed mother liquor high concentration crystallization evaporation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1267173C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100450931C (en) * | 2005-05-18 | 2009-01-14 | 贵阳铝镁设计研究院 | Carbonate-removing method in alumina production |
| CN101704539B (en) * | 2009-09-11 | 2013-12-25 | 中铝国际技术发展有限公司 | Method and device for evaporating mother liquid in aluminium oxide plant |
| CN103351013A (en) * | 2013-06-27 | 2013-10-16 | 中国铝业股份有限公司 | Method for producing aluminum oxide by sintering process |
| CN110028087B (en) * | 2018-07-26 | 2021-08-13 | 沈阳铝镁设计研究院有限公司 | Method for reducing carbon-alkali concentration of system in alumina production process |
| CN108658111A (en) * | 2018-08-24 | 2018-10-16 | 中国科学院过程工程研究所 | A method of improving alumina producing Bayer process efficiency |
| CN111392753B (en) * | 2020-03-31 | 2022-03-15 | 中国铝业股份有限公司 | Method for separating out sodium bicarbonate from deep carbonation mother liquor |
-
2004
- 2004-05-14 CN CN 200410037939 patent/CN1267173C/en not_active Expired - Lifetime
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| Publication number | Publication date |
|---|---|
| CN1597528A (en) | 2005-03-23 |
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| C14 | Grant of patent or utility model | ||
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Effective date of registration: 20170527 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 Ltd. |
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| CX01 | Expiry of patent term |
Granted publication date: 20060802 |
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| CX01 | Expiry of patent term |