CN102009992B - Method for slowing down scarring speed of evaporator - Google Patents
Method for slowing down scarring speed of evaporator Download PDFInfo
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- CN102009992B CN102009992B CN2010106140233A CN201010614023A CN102009992B CN 102009992 B CN102009992 B CN 102009992B CN 2010106140233 A CN2010106140233 A CN 2010106140233A CN 201010614023 A CN201010614023 A CN 201010614023A CN 102009992 B CN102009992 B CN 102009992B
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- Prior art keywords
- evaporation
- liquid
- seed crystal
- evaporator
- filter
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000037390 scarring Effects 0.000 title abstract 3
- 239000012065 filter cake Substances 0.000 claims abstract description 19
- 239000007788 liquid Substances 0.000 claims abstract description 19
- 238000001914 filtration Methods 0.000 claims abstract description 12
- 239000013078 crystal Substances 0.000 claims abstract description 10
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 9
- 230000008020 evaporation Effects 0.000 claims abstract description 9
- 238000001704 evaporation Methods 0.000 claims abstract description 9
- 238000007670 refining Methods 0.000 claims abstract description 8
- 239000006200 vaporizer Substances 0.000 claims description 15
- 230000008016 vaporization Effects 0.000 claims description 13
- 206010039509 Scab Diseases 0.000 claims description 11
- 238000004131 Bayer process Methods 0.000 claims description 9
- 239000012452 mother liquor Substances 0.000 claims description 9
- 210000000582 semen Anatomy 0.000 claims description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 7
- 238000005406 washing Methods 0.000 abstract description 4
- 229910052593 corundum Inorganic materials 0.000 abstract description 2
- 230000000977 initiatory effect Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract description 2
- JYIMWRSJCRRYNK-UHFFFAOYSA-N dialuminum;disodium;oxygen(2-);silicon(4+);hydrate Chemical compound O.[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Na+].[Na+].[Al+3].[Al+3].[Si+4] JYIMWRSJCRRYNK-UHFFFAOYSA-N 0.000 abstract 3
- 230000007062 hydrolysis Effects 0.000 abstract 1
- 238000006460 hydrolysis reaction Methods 0.000 abstract 1
- 239000003513 alkali Substances 0.000 description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 9
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 9
- 229910052814 silicon oxide Inorganic materials 0.000 description 9
- 239000003518 caustics Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 229940115440 aluminum sodium silicate Drugs 0.000 description 4
- 239000000429 sodium aluminium silicate Substances 0.000 description 4
- 235000012217 sodium aluminium silicate Nutrition 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 239000012752 auxiliary agent Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000005432 seston Substances 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 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
- 229910001570 bauxite Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910001388 sodium aluminate Inorganic materials 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
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- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
A method for slowing down scarring speed of evaporator relates to a technique improvement during production procedure of Bayer processed aluminium oxide. The present invention is characterized in that a Bayer processed coarse liquid is added into a mother liquid obtained by filtering after seed crystal decomposition is performed for refining liquid, so as to refine filter cakes discharged by a leaf filter of the system; in an evaporation raw liquid slot and under 70-90 DEG C, the filter cakes stays for about 1-3 hours, and enter an evaporation unit for performing an evaporation process. In the method of the present invention, seed crystal is added in the evaporation raw liquid, sodium silicoaluminate seed crystal surface is provided, and newly separated sodium silicoaluminate is separated from the seed crystal surface, so that the amount of sodium silicoaluminate separated from the surface of an evaporator heat exchange tube is reduced, and the scarring speed of the evaporator is slowed down. Simultaneously, Al2O3 can be recovered from the filter cakes during the evaporation procedure, and alumina hydrolysis loss of the part to be delivered to refining liquid filter cake washed separately and acting as initiation during washing procedure is reduced.
Description
Technical field
A kind of vaporizer method of velocity that scabs of slowing down relates to the process modification in a kind of Bayer process aluminum oxide production process.
Background technology
At present, in the technological process of alumina producing Bayer process, after the bauxite stripping, separating the thick liquid staple that obtains after ore pulp separates is Al
2O
3, Na
2O, SiO
2Because thick liquid seston content exceeds kind of a branch system requirement, need to reduce seston content through thick liquid refining system (leaf filter), the seminal fluid that obtains gets into kind of an operation break-down, and the filter cake that obtains gets into the separating, washing flow process, effluxes with red mud.
The seminal fluid that obtains carries out decomposition of crystal seed and separates out Al (OH) 3; After planting branch; The mother liquor that filtration obtains (being that decomposition nut liquid is claimed vaporizing raw liquor again) will pass through evaporization process, gets rid of redundant moisture, the mother liquor after the evaporation is deployed into the qualified alkali lye of the concentration requirement that meets Bayer process stripping batching.Because the content of the impurity such as mother liquor silicon oxide after decomposing is oversaturated, mother liquor is in evaporative process, and along with the raising of temperature, silicon oxide is with sodium aluminium silicate (Na
2OAl
2O
31.7SiO
22H
2O) the form speed of separating out can be accelerated, and the meeting mass crystallization is separated out on vaporizer heat transfer tube surface, and formation scabs, and can have a strong impact on the vaporizer operational efficiency.
Summary of the invention
This purpose is exactly the deficiency that exists to above-mentioned prior art, and what provide a kind of and can effectively improve the vaporizer operational efficiency, reduce the red mud quantity discharged slows down the vaporizer method of velocity that scabs.
The objective of the invention is to realize through following scheme.
A kind of vaporizer method of velocity that scabs of slowing down; It is characterized in that in seminal fluid carries out mother liquor that the decomposition of crystal seed after-filtration obtains, adding the filter cake that the leaf filter of the thick liquid refining system of Bayer process unloads; In the vaporizing raw liquor groove; Under 70 ~ 90 ℃ of temperature, stop about 1 ~ 3 hour after, get into the evaporation unit again and carry out evaporative process.
A kind of vaporizer method of velocity that scabs of slowing down of the present invention; It is 4 ~ 30g/l that the leaf filter that it is characterized in that in seminal fluid carries out mother liquor that the decomposition of crystal seed after-filtration obtains, adding the thick liquid refining system of Bayer process unloads the filter cake amount; Deviate from the siliceous modulus (mass ratio of aluminum oxide and silicon oxide is referred to as siliceous modulus in the sodium aluminate solution) that partially oxidation silicon improves vaporizing raw liquor through reaction, reach the scab purpose of speed of alleviation vaporizer.
A kind of vaporizer method of velocity that scabs of slowing down of the present invention adopts the filter cake in fine filtration in the thick liquid treating process to make desiliconization agent, and its staple is: Al
2O
3, Na
2O, SiO
2Deng, specific surface area 1.1 ~ 1.7m
2/ g, D [3,2] 3.5 ~ 6.0um, D [4,3] 11.5 ~ 20um, size-grade distribution situation :-3um content 10 ~ 20% ,-10um content 40% ~ 60% ,-30um content 75 ~ 95% ,+45um content 2 ~ 10%.Owing in vaporizing raw liquor (being decomposition nut liquid), add crystal seed, the sodium aluminium silicate seed surface is provided, the sodium aluminium silicate of newly separating out is separated out at seed surface, reduces and separates out the amount of sodium aluminium silicate on vaporizer heat transfer tube surface, slows down the speed that scabs of vaporizer.Simultaneously, can in evaporative process, reclaim the Al2O3 in the filter cake, reduce this part filter cake in fine filtration that should be sent to separating, washing aluminum oxide hydrolysising loss as initiation in washing process simultaneously.
Description of drawings
The process flow sheet of Fig. 1 the inventive method.
Embodiment
A kind of vaporizer method of velocity that scabs of slowing down; In vaporizing raw liquor (being decomposition nut liquid), add filter cake in fine filtration as the desiliconization auxiliary agent; The step of its process comprises: filter cake that the leaf filter of the thick liquid refining system of (1) Bayer process unloads gets into the filter cake groove, the back that stirs by filter cake pumping wherein toward the vaporizing raw liquor groove; (2) stopped about 1 ~ 3 hour at former liquid bath (70 ~ 90 ℃ of temperature), be sent to the evaporation unit by concentrate pump again; (3) in vaporizer, stop 30～60 minutes, major part is sent to mother liquor tank, and few part gets into forces effect to continue inspissation; (4) getting into pressure effect inspissation part goes to the salt discharge operation with cake form exclusive segment white residue again; (5) most of white residue solid phase gets into the next one circulation of Bayer process system with circulation alkali liquor.The addition of desiliconization auxiliary agent is 4 ~ 30g/l.
Embodiment 1
Vaporizing raw liquor composition: full alkali: 180.1g/l aluminum oxide: 87.33g/l caustic alkali: 162.0g/l silicon oxide: 1.375g/l Rp:0.539 siliceous modulus: 63.5.The filter cake in fine filtration add-on is pressed 4g/l and is added; Reaction is 1 hour under 70 ℃ of conditions of water-bath; Vaporizing raw liquor composition after the desiliconization: full alkali: 183.30g/l aluminum oxide: 88.3g/l caustic alkali: 165.0g/l silicon oxide: 1.005g/l Rp:0.535 siliceous modulus: 87.9, siliceous modulus improves 24.2.
Embodiment 2
Vaporizing raw liquor composition: full alkali: 180.1g/l aluminum oxide: 87.33g/l caustic alkali: 162.0g/l silicon oxide: 1.375g/l Rp:0.539 siliceous modulus: 63.5.The filter cake in fine filtration add-on is pressed 10g/l and is added; Reaction is 2 hours under 80 ℃ of conditions of water-bath; Vaporizing raw liquor composition after the desiliconization: full alkali: 193.0g/l aluminum oxide: 88.09g/l caustic alkali: 169.4g/l silicon oxide: 0.926g/l Rp:0.520 siliceous modulus: 95.1, siliceous modulus improves 31.6.
Embodiment 3
Vaporizing raw liquor composition: full alkali: 180.1g/l aluminum oxide: 87.33g/l caustic alkali: 162.0g/l silicon oxide: 1.375g/l Rp:0.539 siliceous modulus: 63.5.The filter cake in fine filtration add-on is pressed 30g/l and is added; Reflection is 3 hours under 90 ℃ of conditions of water-bath; Vaporizing raw liquor composition after the desiliconization: full alkali: 207.8.30g/l aluminum oxide: 93.1g/l caustic alkali: 184.0g/l silicon oxide: 0.597g/l Rp:0.506 siliceous modulus: 156.0, siliceous modulus improves 92.5.
Claims (1)
1. one kind is slowed down the vaporizer method of velocity that scabs; It is characterized in that in seminal fluid carries out mother liquor that the decomposition of crystal seed after-filtration obtains, adding the filter cake that the leaf filter of the thick liquid refining system of Bayer process unloads; In the vaporizing raw liquor groove; Under 70 ~ 90 ℃ of temperature, stop after 1 ~ 3 hour, get into the evaporation unit again and carry out evaporative process; It is 4 ~ 30g/L that the leaf filter that in seminal fluid carries out mother liquor that the decomposition of crystal seed after-filtration obtains, adds the thick liquid refining system of Bayer process unloads the filter cake amount.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106140233A CN102009992B (en) | 2010-12-30 | 2010-12-30 | Method for slowing down scarring speed of evaporator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106140233A CN102009992B (en) | 2010-12-30 | 2010-12-30 | Method for slowing down scarring speed of evaporator |
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| Publication Number | Publication Date |
|---|---|
| CN102009992A CN102009992A (en) | 2011-04-13 |
| CN102009992B true CN102009992B (en) | 2012-07-25 |
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|---|---|---|---|
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| CN108328830A (en) * | 2018-01-31 | 2018-07-27 | 大唐国际发电股份有限公司高铝煤炭资源开发利用研发中心 | A kind of recovery method and retracting device of 4A zeolites mother liquor |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1887710A (en) * | 2006-07-14 | 2007-01-03 | 山东铝业股份有限公司 | Method of retarding leaching scaling of low temperature pipeline |
| CN1907857A (en) * | 2006-08-01 | 2007-02-07 | 中国铝业股份有限公司 | Circulation alkali liquor desiliconization method by Bayer process |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3440483B2 (en) * | 1993-02-19 | 2003-08-25 | 住友化学工業株式会社 | Method for removing water from circulating alkali aluminate solution |
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2010
- 2010-12-30 CN CN2010106140233A patent/CN102009992B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1887710A (en) * | 2006-07-14 | 2007-01-03 | 山东铝业股份有限公司 | Method of retarding leaching scaling of low temperature pipeline |
| CN1907857A (en) * | 2006-08-01 | 2007-02-07 | 中国铝业股份有限公司 | Circulation alkali liquor desiliconization method by Bayer process |
Non-Patent Citations (1)
| Title |
|---|
| JP特开平6-247710A 1994.09.06 |
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| CN102009992A (en) | 2011-04-13 |
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Effective date of registration: 20170606 Address after: Qixian town Henan province 454171 Xiuwu County of Zhongzhou aluminum plant Patentee after: Chalco Zhongzhou Aluminium Industry Co., Ltd. Address before: 100082 Beijing, Xizhimen, North Street, No. 62, No. Patentee before: Aluminum Corporation of China Limited |