CN102951667B - Method for desilicating sodium aluminate solution - Google Patents
Method for desilicating sodium aluminate solution Download PDFInfo
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- CN102951667B CN102951667B CN201210483783.4A CN201210483783A CN102951667B CN 102951667 B CN102951667 B CN 102951667B CN 201210483783 A CN201210483783 A CN 201210483783A CN 102951667 B CN102951667 B CN 102951667B
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- Prior art keywords
- sodium aluminate
- aluminate solution
- flyash
- desilication
- desilicification
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- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 title claims abstract description 101
- 229910001388 sodium aluminate Inorganic materials 0.000 title claims abstract description 101
- 238000000034 method Methods 0.000 title claims abstract description 66
- 238000000926 separation method Methods 0.000 claims abstract description 25
- 239000007788 liquid Substances 0.000 claims abstract description 17
- 239000002994 raw material Substances 0.000 claims abstract description 9
- 239000002002 slurry Substances 0.000 claims abstract description 4
- 239000010881 fly ash Substances 0.000 claims description 82
- 238000003756 stirring Methods 0.000 claims description 25
- 239000007787 solid Substances 0.000 claims description 21
- 229910052710 silicon Inorganic materials 0.000 claims description 14
- 239000010703 silicon Substances 0.000 claims description 14
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 7
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 7
- 239000003245 coal Substances 0.000 claims description 7
- 239000004571 lime Substances 0.000 claims description 7
- 239000000428 dust Substances 0.000 claims description 6
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 6
- 238000005245 sintering Methods 0.000 claims description 5
- 238000001354 calcination Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 3
- 239000013078 crystal Substances 0.000 abstract description 3
- 239000000446 fuel Substances 0.000 abstract 4
- 229910052681 coesite Inorganic materials 0.000 abstract 1
- 229910052906 cristobalite Inorganic materials 0.000 abstract 1
- 239000000377 silicon dioxide Substances 0.000 abstract 1
- 235000012239 silicon dioxide Nutrition 0.000 abstract 1
- 229910052682 stishovite Inorganic materials 0.000 abstract 1
- 229910052905 tridymite Inorganic materials 0.000 abstract 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 10
- 229910004298 SiO 2 Inorganic materials 0.000 description 7
- 230000004913 activation Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 3
- 238000004131 Bayer process Methods 0.000 description 2
- 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 description 1
- 239000004102 Synthetic calcium aluminate Substances 0.000 description 1
- JETSKDPKURDVNI-UHFFFAOYSA-N [C].[Ca] Chemical compound [C].[Ca] JETSKDPKURDVNI-UHFFFAOYSA-N 0.000 description 1
- OSMSIOKMMFKNIL-UHFFFAOYSA-N calcium;silicon Chemical compound [Ca]=[Si] OSMSIOKMMFKNIL-UHFFFAOYSA-N 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- 150000004677 hydrates Chemical class 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- 239000012716 precipitator Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 235000019361 synthetic calcium aluminate Nutrition 0.000 description 1
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- Processing Of Solid Wastes (AREA)
Abstract
The invention provides a method for desilicating a sodium aluminate solution and relates to a method for desilicating a sodium aluminate solution by comprehensively utilizing pulverized fuel ash. The method is characterized by comprising the following steps of: on the basis of utilizing the pulverized fuel ash as a desilication seed crystal, adding the sodium aluminate solution, desilicating under a normal pressure or medium pressure, and carrying out solid-liquid separation on a slurry after desilication; and then carrying out deep desilication on the solution, wherein the pulverized fuel ash separated out through the deep desilication is used as a raw material for burdening and producing aluminium oxide. By utilizing the method for desilicating the sodium aluminate solution, not only can the SiO2 in the sodium aluminate solution be effectively removed, but also the aluminium oxide loss is less, and the pulverized fuel ash after desilication can be directly returned as the raw material for producing aluminium oxide.
Description
Technical field
A method for sodium aluminate solution desilicification, relates to a kind of method that fully utilizes flyash and carry out sodium aluminate solution desilicification.
Background technology
In aluminum oxide production process, often need to carry out desiliconization to sodium aluminate solution.As in sintering process for alumina production, the sodium aluminate solution after grog stripping need to set up independent desiliconization process to decompose the requirement to solution A/S to meet carbonating.Existing desilication process, using Bayer process red mud, sodium white residue or calcium-silicon slag etc. as Desilication seed, in order to reach higher A/S, even also needs to adopt synthetic calcium aluminate hydrates or carbon calcium aluminate to carry out deep desilication as crystal seed.Because pure alumina by sintering factory is without Bayer process red mud, the selection of Desilication seed is restricted.
Summary of the invention
Object of the present invention is exactly the deficiency existing for above-mentioned prior art, provide a kind of simple effectively, reliability service can bring up to 110～1000 from 15～25 by A/S in sodium aluminate solution, can fully utilize the method for the sodium aluminate solution desilicification of flyash.
The object of the invention is to be achieved through the following technical solutions.
A method for sodium aluminate solution desilicification, is characterized in that adopting flyash as Desilication seed, adds sodium aluminate solution to carry out normal pressure or middle pressure-off silicon, and the slurries after desiliconization are through solid-liquid separation; Solution enters next step and carries out deep desilication, and the flyash that deep desilication is separated, as raw material, is prepared burden and produced aluminum oxide.
The method of a kind of sodium aluminate solution desilicification of the present invention, is characterized in that as the flyash of Desilication seed be the fresh coal fly ash that thermal power plant three, level Four are gathered dust.
The method of a kind of sodium aluminate solution desilicification of the present invention, is characterized in that as the flyash of Desilication seed being levigate to-100 object flyash.
The method of a kind of sodium aluminate solution desilicification of the present invention, is characterized in that as the flyash of Desilication seed being levigate to-100 orders, then the flyash that carries out roasting.
The method of a kind of sodium aluminate solution desilicification of the present invention, the temperature that it is characterized in that carrying out calcining fly ash is 500～800 ℃, the time of curing is 1 hour.
The method of a kind of sodium aluminate solution desilicification of the present invention, it is characterized in that by liquid-solid ratio be 50～100g/l, controls the amount that adds the flyash as Desilication seed in sodium aluminate solution.
The method of a kind of sodium aluminate solution desilicification of the present invention, it is characterized in that adopting fresh coal fly ash that thermal power plant three, level Four gather dust as Desilication seed, the temperature that adds sodium aluminate solution to carry out normal pressure or middle pressure-off silicon is 90～170 ℃, lower stirring desiliconization 2～4 hours, carry out liquid-solid separation, the A/S of sodium aluminate solution can reach more than 130 again.
The method of a kind of sodium aluminate solution desilicification of the present invention, it is characterized in that adopting levigate extremely-100 object flyash as Desilication seed, the temperature that adds sodium aluminate solution to carry out atmospheric silicon removing is 90～110 ℃, lower stirring desiliconization 2～4 hours, carry out liquid-solid separation, the A/S of sodium aluminate solution can reach more than 110 again.
The method of a kind of sodium aluminate solution desilicification of the present invention, it is characterized in that adopting through levigate to-100 orders, the flyash that carries out roasting is again as Desilication seed, the temperature that adds sodium aluminate solution to carry out atmospheric silicon removing is 90～100 ℃, lower stirring desiliconization 2～4 hours, carry out liquid-solid separation, the A/S of sodium aluminate solution can reach more than 200 again.
The method of a kind of sodium aluminate solution desilicification of the present invention, the lime that it is characterized in that adopting active fly ash (comprising fresh active fly ash, levigate active fly ash and active fly ash levigate and that cure) and account for flyash quality 10% is jointly as Desilication seed, add sodium aluminate solution at 90～100 ℃, to stir desiliconization 2～4 hours, carry out liquid-solid separation, the A/S of sodium aluminate solution can reach more than 220 again.
The method of a kind of sodium aluminate solution desilicification of the present invention, it is characterized in that adopting through levigate to-100 orders, the flyash that carries out roasting is again as Desilication seed, add sodium aluminate solution to carry out the desiliconization of middle pressure second segment at 160～180 ℃, after first paragraph desiliconization, the A/S of solution reaches 200～240, and after second segment desiliconization, the A/S of solution reaches 550～600.
The method of a kind of sodium aluminate solution desilicification of the present invention, it is characterized in that adopting fresh coal fly ash that thermal power plant three, level Four gather dust as Desilication seed, add sodium aluminate solution to carry out middle pressure-off silicon at 160～180 ℃, after first paragraph desiliconization, the A/S of solution reaches 300～350, and after second segment desiliconization, the A/S of solution reaches 600～1000.
The method of a kind of sodium aluminate solution desilicification of the present invention, the lime that it is characterized in that adopting active fly ash (comprising fresh active fly ash, levigate active fly ash and active fly ash levigate and that cure) and account for flyash quality 10% is jointly as Desilication seed, add sodium aluminate solution at 90～100 ℃, to stir desiliconization 2～4 hours, and then be heated to 160～180 ℃ stir 2～3 hours, finally carrying out solid-liquid separation, the A/S of sodium aluminate solution can reach more than 350.
The method of a kind of sodium aluminate solution desilicification of the present invention, the main thing of the flyash of employing is mullite and quartz mutually, granularity is thinner, through further levigate and cure activation after specific surface area increase considerably, there is higher surfactivity, be suitable as Desilication seed.The method of doing crystal seed and carry out sodium aluminate solution desilicification with active fly ash of the present invention, has simplified sodium aluminate solution desilicification technique, reduces desiliconization process alumina loss, the flyash after desiliconization again can be directly as the raw material of production aluminum oxide.The method of a kind of sodium aluminate solution desilicification of the present invention, can not only remove the SiO in sodium aluminate solution effectively
2, and alumina loss is little, the flyash after desiliconization can returning alumina production process as raw material, as produced the raw material of aluminum oxide as sintering process in sintering process technique.
Concrete embodiment
A method for sodium aluminate solution desilicification, adopts flyash as Desilication seed, adds sodium aluminate solution to carry out normal pressure or middle pressure-off silicon, and the slurries after desiliconization are through solid-liquid separation; Solution enters next step and carries out deep desilication, and the flyash that deep desilication is separated, as raw material, is prepared burden and produced aluminum oxide.
The method of a kind of sodium aluminate solution desilicification of the present invention is levigate to-100 object flyash as the flyash of Desilication seed.
The method of a kind of sodium aluminate solution desilicification of the present invention, is levigate to-100 orders as the flyash of Desilication seed, then the flyash that carries out roasting; The temperature of carrying out calcining fly ash is 500～800 ℃, and the time of curing is 1 hour.
The method of a kind of sodium aluminate solution desilicification of the present invention, is characterized in that as the flyash of Desilication seed be the fresh coal fly ash that thermal power plant three, level Four are gathered dust.
The method of a kind of sodium aluminate solution desilicification of the present invention, is to be 50～100g/l by liquid-solid ratio, controls the amount that adds the flyash as Desilication seed in sodium aluminate solution.
The method of a kind of sodium aluminate solution desilicification of the present invention, adopt levigate to-100 object flyash as Desilication seed, the temperature that adds sodium aluminate solution to carry out atmospheric silicon removing is 90～100 ℃, lower stirring desiliconization 2～4 hours, carry out liquid-solid separation, the A/S of sodium aluminate solution can reach more than 110 again.
The method of a kind of sodium aluminate solution desilicification of the present invention, adopt through levigate to-100 orders, the flyash that carries out roasting is again as Desilication seed, the temperature that adds sodium aluminate solution to carry out atmospheric silicon removing is 90～100 ℃, lower stirring desiliconization 2～4 hours, carry out liquid-solid separation, the A/S of sodium aluminate solution can reach more than 200 again.
The method of a kind of sodium aluminate solution desilicification of the present invention, the lime that adopts active fly ash (comprising fresh active fly ash, levigate active fly ash and active fly ash levigate and that cure) and account for flyash quality 10% is jointly as Desilication seed, add sodium aluminate solution at 90～100 ℃, to stir desiliconization 2～4 hours, carry out liquid-solid separation, the A/S of sodium aluminate solution can reach more than 220 again.
The method of a kind of sodium aluminate solution desilicification of the present invention, adopt through levigate to-100 orders, the flyash that carries out roasting is again as Desilication seed, what add that sodium aluminate solution carries out middle pressure-off silicon is two sections, after first paragraph desiliconization, the A/S of solution reaches 200～240, and after second segment desiliconization, the A/S of solution reaches 550～600.
The method of a kind of sodium aluminate solution desilicification of the present invention, the fresh coal fly ash that employing thermal power plant three, level Four are gathered dust is as Desilication seed, add sodium aluminate solution to carry out middle pressure-off silicon at 160～180 ℃, after first paragraph desiliconization, the A/S of solution reaches 300～350, and after second segment desiliconization, the A/S of solution reaches 600～1000.
The method of a kind of sodium aluminate solution desilicification of the present invention, the lime that adopts active fly ash (comprising fresh active fly ash, levigate active fly ash and active fly ash levigate and that cure) and account for flyash quality 10% is jointly as Desilication seed, add sodium aluminate solution at 90～100 ℃, to stir desiliconization 2～4 hours, and then be heated to 160～180 ℃ stir 2～3 hours, finally carrying out solid-liquid separation, the A/S of sodium aluminate solution can reach more than 350.
Embodiment 1
A desilication method for sodium aluminate solution, adds Al according to liquid-solid ratio as 75g/l take the flyash of levigate activation by process method
2o
3128g/l, α
k=1.40, SiO
2in the sodium aluminate solution of 6.1g/l, at 100 ℃, constant temperature stirs desiliconization in 4 hours, so filtering separation, desiliconization liquid α
k=1.41, A/S=103.
Embodiment 2
A desilication method for sodium aluminate solution, will add Al according to liquid-solid ratio as 75g/l to-100 object flyash take levigate through method
2o
3128g/l, α
k=1.39, SiO
2in the sodium aluminate solution of 6.1g/l, at 170 ℃, constant temperature stirs desiliconization in 3 hours, so filtering separation, desiliconization liquid α
k=1.42, A/S=213.
Embodiment 3
A desilication method for sodium aluminate solution is that 100g/l adds Al by-100 order flyash that obtain through size classification according to liquid-solid ratio
2o
3126g/l, α
k=1.40, SiO
2in the sodium aluminate solution of 6.5g/l, at 98 ℃, constant temperature stirs desiliconization in 3 hours, so filtering separation, desiliconization liquid α
k=1.41, A/S=107.
Embodiment 4
A desilication method for sodium aluminate solution, will cure activation 1 hour at 600 ℃ through being milled to-100 order flyash, be then that 100g/l adds Al according to liquid-solid ratio
2o
3119g/l, α
k=1.38, SiO
2in the sodium aluminate solution of 5.6g/l, at 98 ℃, constant temperature stirs desiliconization in 4 hours, refilters separation, desiliconization liquid α
k=1.40, A/S=123.
Embodiment 5
A desilication method for sodium aluminate solution, will cure activation 1 hour at 600 ℃ through being milled to-100 order flyash, be then that 75g/l adds Al according to liquid-solid ratio
2o
3119g/l, α
k=1.39, SiO
2in the sodium aluminate solution of 5.6g/l, at 170 ℃, constant temperature stirs desiliconization in 3 hours, refilters separation, desiliconization liquid α
k=1.40, A/S=267.
Embodiment 6
A desilication method for sodium aluminate solution, will cure activation 1 hour at 600 ℃ through being milled to-100 order flyash, be then that 75g/l adds Al according to liquid-solid ratio
2o
3122g/l, α
k=1.44, SiO
2in the sodium aluminate solution of 0.56g/l, at 98 ℃, constant temperature stirs desiliconization in 4 hours, refilters separation, desiliconization liquid α
k=1.45, A/S=596.
Embodiment 7
A method for sodium aluminate solution desilicification is that 75g/l adds Al by the fresh coal fly ash of taking from thermal power plant three, level Four dust-precipitator according to liquid-solid ratio
2o
3128g/l, α
k=1.40, SiO
27.1g/l sodium aluminate solution stirs desiliconization 2～4 hours at 95 ℃, then carries out liquid-solid separation, desiliconization liquid α
k=1.41, A/S=227.
Embodiment 8
A kind of method of sodium aluminate solution desilicification, the lime that adopts active fly ash levigate and that cure and account for flyash quality 10% is jointly as Desilication seed, be that 80g/l adds sodium aluminate solution at 90～100 ℃, to stir desiliconization 3 hours according to liquid-solid ratio, and then be heated to 170 ℃ stir 2.5 hours, finally carrying out solid-liquid separation, the A/S of desiliconization liquid is 398.
Claims (10)
1. a method for sodium aluminate solution desilicification, is characterized in that adopting flyash as Desilication seed, adds sodium aluminate solution to carry out normal pressure or middle pressure-off silicon, and the slurries after desiliconization are through solid-liquid separation; Solution enters next step and carries out deep desilication, and the flyash that deep desilication is separated is prepared burden and produced aluminum oxide as raw material.
2. the method for a kind of sodium aluminate solution desilicification according to claim 1, is characterized in that as the flyash of Desilication seed being levigate to-100 object flyash.
3. the method for a kind of sodium aluminate solution desilicification according to claim 1, is characterized in that as the flyash of Desilication seed being levigate to-100 orders, then the flyash that carries out roasting; The temperature of carrying out calcining fly ash is 500～800 ℃, and the time of curing is 1 hour.
4. the method for a kind of sodium aluminate solution desilicification according to claim 1, is characterized in that as the flyash of Desilication seed be the fresh coal fly ash that thermal power plant three, level Four are gathered dust.
5. the method for a kind of sodium aluminate solution desilicification according to claim 1, it is characterized in that by solid-to-liquid ratio be 50～100g/L, controls the amount that adds the flyash as Desilication seed in sodium aluminate solution.
6. the method for a kind of sodium aluminate solution desilicification according to claim 1, it is characterized in that adopting levigate extremely-100 object flyash as Desilication seed, the temperature that adds sodium aluminate solution to carry out normal pressure or middle pressure-off silicon is 90～170 ℃, stirs desiliconization 0.5～7 hour, then carries out liquid-solid separation.
7. the method for a kind of sodium aluminate solution desilicification according to claim 1, it is characterized in that adopting through levigate to-100 orders, the flyash that carries out roasting is again as Desilication seed, the temperature that adds sodium aluminate solution to carry out normal pressure or middle pressure-off silicon is 90～100 ℃, stir desiliconization 2～4 hours, then carry out liquid-solid separation.
8. the method for a kind of sodium aluminate solution desilicification according to claim 1, the lime that it is characterized in that adopting flyash and account for flyash quality 10% is jointly as Desilication seed, add sodium aluminate solution at 90～100 ℃, to stir desiliconization 2～4 hours, then carry out liquid-solid separation.
9. the method for a kind of sodium aluminate solution desilicification according to claim 1, the lime that it is characterized in that adopting flyash and account for flyash quality 10% is jointly as Desilication seed, add sodium aluminate solution at 90～100 ℃, to stir desiliconization 2～4 hours, and then be heated to 160～180 ℃ of stirrings 2～3 hours, finally carry out again solid-liquid separation.
10. the method for a kind of sodium aluminate solution desilicification according to claim 1, is characterized in that adopting through levigate to-100 orders, then the flyash that carries out roasting is as Desilication seed, and what add that sodium aluminate solution carries out normal pressure or middle pressure-off silicon is two sections; The flyash that its deep desilication is separated is prepared burden and is returned to the charge pulp preparation process of sintering process as raw material.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1320559A (en) * | 2000-04-26 | 2001-11-07 | 中南工业大学 | Process for desiliconizing crude liquid obtained by sinter method |
| CN1775689A (en) * | 2005-11-28 | 2006-05-24 | 中国铝业股份有限公司 | Sintering process sodium aluminate solution desilicification method |
| CN101397604A (en) * | 2007-09-30 | 2009-04-01 | 中国科学院过程工程研究所 | Dense alkali liquid leaching pre-desiliconisation method for bauxite |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9602343D0 (en) * | 1996-02-06 | 1996-04-03 | Allied Colloids Ltd | Production of alumina |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1320559A (en) * | 2000-04-26 | 2001-11-07 | 中南工业大学 | Process for desiliconizing crude liquid obtained by sinter method |
| CN1775689A (en) * | 2005-11-28 | 2006-05-24 | 中国铝业股份有限公司 | Sintering process sodium aluminate solution desilicification method |
| CN101397604A (en) * | 2007-09-30 | 2009-04-01 | 中国科学院过程工程研究所 | Dense alkali liquid leaching pre-desiliconisation method for bauxite |
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