CN1907857A - Circulation alkali liquor desiliconization method by Bayer process - Google Patents
Circulation alkali liquor desiliconization method by Bayer process Download PDFInfo
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- CN1907857A CN1907857A CN 200610103782 CN200610103782A CN1907857A CN 1907857 A CN1907857 A CN 1907857A CN 200610103782 CN200610103782 CN 200610103782 CN 200610103782 A CN200610103782 A CN 200610103782A CN 1907857 A CN1907857 A CN 1907857A
- Authority
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- China
- Prior art keywords
- alkali liquor
- solution
- lime
- circulation alkali
- bayer process
- Prior art date
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000004131 Bayer process Methods 0.000 title claims abstract description 15
- 239000003513 alkali Substances 0.000 title claims description 31
- 238000006243 chemical reaction Methods 0.000 claims abstract description 22
- 229910001570 bauxite Inorganic materials 0.000 claims abstract description 13
- 239000002893 slag Substances 0.000 claims abstract description 11
- OSMSIOKMMFKNIL-UHFFFAOYSA-N calcium;silicon Chemical compound [Ca]=[Si] OSMSIOKMMFKNIL-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000001704 evaporation Methods 0.000 claims abstract description 10
- 230000008020 evaporation Effects 0.000 claims abstract description 10
- 238000005245 sintering Methods 0.000 claims abstract description 7
- 239000007787 solid Substances 0.000 claims abstract description 4
- 239000000920 calcium hydroxide Substances 0.000 claims description 18
- 235000011116 calcium hydroxide Nutrition 0.000 claims description 18
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 7
- 239000011575 calcium Substances 0.000 claims description 7
- 229910052791 calcium Inorganic materials 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 6
- 230000035484 reaction time Effects 0.000 claims description 3
- 239000000243 solution Substances 0.000 abstract description 29
- 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
- 235000008733 Citrus aurantifolia Nutrition 0.000 abstract description 8
- 206010039509 Scab Diseases 0.000 abstract description 8
- 235000011941 Tilia x europaea Nutrition 0.000 abstract description 8
- 239000004571 lime Substances 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 239000007788 liquid Substances 0.000 abstract description 3
- 239000012670 alkaline solution Substances 0.000 abstract 2
- 239000006071 cream Substances 0.000 abstract 1
- 239000002223 garnet Substances 0.000 abstract 1
- 238000002156 mixing Methods 0.000 abstract 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Inorganic materials [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 15
- 239000012452 mother liquor Substances 0.000 description 10
- 239000006200 vaporizer Substances 0.000 description 9
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 8
- 238000002360 preparation method Methods 0.000 description 8
- 239000012141 concentrate Substances 0.000 description 6
- 230000008016 vaporization Effects 0.000 description 6
- 229910004298 SiO 2 Inorganic materials 0.000 description 5
- 238000000354 decomposition reaction Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 239000002002 slurry Substances 0.000 description 3
- 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 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 229910001648 diaspore Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 235000017550 sodium carbonate Nutrition 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 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
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000404 calcium aluminium silicate Substances 0.000 description 1
- 229940078583 calcium aluminosilicate Drugs 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000011514 reflex Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229960001866 silicon dioxide Drugs 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 229910001388 sodium aluminate Inorganic materials 0.000 description 1
- 239000012265 solid product Substances 0.000 description 1
Landscapes
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
This invention disclose a desilication method for cycle alkaline solution during alumina production with bayer process. Said method comprises adding lime cream in the solution before evaporation and carrying out desilication reaction, separating liquid and solid, concentrating the separated liquid as cycle alkaline solution for dissolving bauxite, and taking the calcium-silicon slags (hydrate garnet) of low saturation coefficient to raw slury blending with sintering. The method can reduce scabs of heat exchange equipment and loss of alumina.
Description
Technical field
The invention discloses a kind of circulation alkali liquor desiliconization method by Bayer process, relate to technical field of alumina production, be applicable to the desiliconization production process of circulation alkali liquor in the alumina producing Bayer process.
Background technology
When handling diaspore type bauxite and produce aluminum oxide, all adopt and strengthen dissolving-out process, the circulation alkali liquor of promptly high Nk concentration, higher stripping temperature and add means such as additive with Bayer process.For obtaining the circulation alkali liquor that Nk concentration is 210～280g/l high density, needing the solution after decomposing is that vaporizing raw liquor concentrates.Because bayer liquors SiO
2The content height is at evaporative process SiO
2Saturation ratio improve, generate sodium white residue NaOAl on the heating tube surface
2O
31.7SiO
2NH
2O scabs, and influences the heat exchange effect, has shortened the equipment operation cycle.
At the bauxite process in leaching, for making full use of the stripping secondary steam, add (in advance) heat indirectly, to reduce the production steam consumption to dissolved mineral slurry and circulation alkali liquor.Since the diversity of silicon mine in the diaspore, its reflex action difference, for alleviating scabbing of ore pulp indirect heater, " double stream process " dissolving-out process that often adopts ore pulp and alkali lye to heat respectively.
On March 26th, 2003, disclosed application number was " a kind of method of alumina producing Bayer process " patent of 02148930.0, proposed the mother liquor stream that lime is added in high bauxite slurry that contains admittedly of preparation and preparation, 160～220 ℃ of pulp pre-heating temperature.The lime that adds mother liquor to can be part, also can be all to add in the mother liquor stream.Lime can be with the mother liquor preheating, also lime can be joined in the mother liquor behind reaction certain hour under 50～105 ℃ the temperature, separates mother liquor and milk of lime, and milk of lime is used to prepare height and contains ore pulp admittedly, the replacing lime additive.
Above-mentioned patent adopts differing temps preheating ore pulp and mother liquor, because the preheating temperature of ore pulp reduces, will reduce the generation that the pulp pre-heating system scabs; Simultaneously in mother liquor, add lime, make the mother liquor heating system not possess the possibility that produces the sodium white residue.But in actual production, because circulation alkali liquor SiO
2The saturation ratio high-content at 0.8～1.6g/l, along with the rising of circulation alkali liquor preheating temperature, SiO
2Act on heat exchanger surface with CaO and generate calcium-silicon slag, influence the heat-transfer effect of mother liquor warm.
On November 6th, 2002, disclosed number of patent application was in " deviating from the technology of silicon-dioxide from Bayer process sodium aluminate solution " patent of 02110045.4, proposed lime slaking is become milk of lime, by stoste molecular ratio CaO/SiO
2=5～20 add solution, with steam heating temperature is increased to 80～90 ℃, keep stirring, reaction 30～60min carries out desilication reaction, and reacted slurries press filtration separates, the solid product Ca-Al slag that desiliconization forms dilutes with the alkali lye that contains yellow soda ash 40～50g/l, mix,, decompose stripping Al at 90 ± 2 ℃ of stirring reaction 60min
2O
3, finish sodium carbonate causticization and become NaOH, send raw pulp desilication reaction groove back to, improve pre-desiliconization effect as seed.Exsolution red mud A/S was higher after there was the pre-desiliconization of Ca-Al slag seed in this patent, the shortcoming that the alumina recovery rate is low.
Summary of the invention
The present invention is directed in the above-mentioned alumina producing Bayer process method, circulation alkali liquor is in evaporation and the problem that easily scabs in heat exchanger surface formation during the stripping preheating, proposes a kind ofly can effectively reduce SiO in the solution
2Content, reduce its equilibrium concentration, alleviate and avoid solution evaporation and during the stripping preheating heat exchanger surface scab, improve the heat exchange effect, reduce steam consumption, reduce the circulation alkali liquor desiliconization method by Bayer process of alumina production cost.
The objective of the invention is to be achieved through the following technical solutions.
Circulation alkali liquor desiliconization method by Bayer process, it is characterized in that adding milk of lime in the stoste of desiliconization process before evaporation, carry out the solution desilicification reaction, carry out liquid-solid separation then, solution after the separation is through the circulation alkali liquor of evaporation concentration as stripping bauxite, and calcium-silicon slag is delivered to the allotment of sintering process charge pulp.
Circulation alkali liquor desiliconization method by Bayer process of the present invention, it is characterized in that the solution desilicification condition is: the desilication reaction temperature is 70～110 ℃, reaction times 30～120min, the effective calcium CaO of milk of lime
fAddition be 1～20g/l.
Method of the present invention adds milk of lime in the vaporizing raw liquor after decomposition, 70～110 ℃ of temperature of reaction, reacts 30～120min under the stirring condition, carries out the solution desilicification reaction, generates calcium-silicon slag---calcium aluminosilicate hydrate 3CaO.Al
2O
3.xSiO
2. (6-2x) H
2O.Carry out solution after the reaction and separate with calcium-silicon slag, solution circulation alkali liquor as stripping bauxite after vaporizer concentrates uses, and delivers to the charge pulp preparation after the carbon mother liquid dilution of white residue with sintering process.
Because solution has carried out desiliconization, SiO in the solution
2Content reduce, reduced its equilibrium concentration, when circulation alkali liquor evaporation and stripping preheating, will avoid or reduce generating and scab raising heat exchange effect at heat exchanger surface.
Isolated calcium-silicon slag is delivered to sintering process charge pulp preparation, avoided the active bad of CaO in this part calcium-silicon slag, be unfavorable for the situation of the high pressure stripping of bauxite.CaO and Al in the calcium-silicon slag
2O
3To the charge pulp batching all is useful composition, behind the grog sintering, and substantially all strippings of aluminum oxide, and CaO all enters in the red mud, can improve the total yield height of aluminum oxide like this.
The present invention had both alleviated scabbing of heat-exchange equipment in the production process, had improved the rate of recovery of aluminum oxide again, had promptly reduced alumina loss.
Embodiment
Circulation alkali liquor desiliconization method by Bayer process adds milk of lime in the stoste before evaporation, the effective calcium CaO of milk of lime
fAddition be 1～20g/l, 70～110 ℃ of temperature of reaction, to carrying out liquid-solid separation behind the solution desilicification, the solution after the separation is through the circulation alkali liquor of evaporation concentration as stripping bauxite under the desiliconization condition of stirring reaction time 30～120min, and calcium-silicon slag is delivered to the allotment of sintering process charge pulp.
Embodiment 1
SiO after decomposition
2Content is to add milk of lime in the vaporizing raw liquor of 1.05g/l, and the addition of the effective calcium of milk of lime is 12g/l.The desilication reaction temperature is 70 ℃, churning time 100min, SiO in the solution of reaction back
2Content drops to 0.56g/l, carries out solution then and separates with white residue, and solution circulation alkali liquor as stripping bauxite after vaporizer concentrates uses, and white residue is delivered to the charge pulp preparation.The total yield of aluminum oxide brings up to 88.7% by 82.6%, and the cycle of operation of vaporizer extended to 46 days by 30 days, and the life cycle of alkali lye preheater extended to 60 days by 48 days.
Embodiment 2
SiO after decomposition
2Content is to add milk of lime in the vaporizing raw liquor of 1.52g/l, and the addition of the effective calcium of milk of lime is 20g/l.The desilication reaction temperature is 90 ℃, churning time 110min, SiO in the solution of reaction back
2Content drops to 0.45g/l, carries out solution then and separates with white residue, and solution circulation alkali liquor as stripping bauxite after vaporizer concentrates uses, and white residue is delivered to the charge pulp preparation.The total yield of aluminum oxide brings up to 88.8% by 80.6%, and the cycle of operation of vaporizer extended to 47 days by 28 days, and the life cycle of alkali lye preheater extended to 62 days by 45 days.
Embodiment 3
SiO after decomposition
2Content is to add milk of lime in the vaporizing raw liquor of 1.34g/l, and the addition of the effective calcium of milk of lime is 1g/l.The desilication reaction temperature is 75 ℃, churning time 60min, SiO in the solution of reaction back
2Content drops to 0.30g/l, carries out solution then and separates with white residue, and solution circulation alkali liquor as stripping bauxite after vaporizer concentrates uses, and white residue is delivered to the charge pulp preparation.The total yield of aluminum oxide brings up to 87.7% by 80.6%, and the cycle of operation of vaporizer extended to 46 days by 28 days, and the life cycle of alkali lye preheater extended to 66 days by 45 days.
Embodiment 4
SiO after decomposition
2Content is to add milk of lime in the vaporizing raw liquor of 1.28g/l, and the addition of the effective calcium of milk of lime is 5g/l.The desilication reaction temperature is 85 ℃, churning time 30min, SiO in the solution of reaction back
2Content drops to 0.67g/l, carries out solution then and separates with white residue, and solution circulation alkali liquor as stripping bauxite after vaporizer concentrates uses, and white residue is delivered to the charge pulp preparation.The total yield of aluminum oxide brings up to 87.5% by 80.3%, and the cycle of operation of vaporizer extended to 43 days by 30 days, and the life cycle of alkali lye preheater extended to 55 days by 42 days.
Claims (2)
1. circulation alkali liquor desiliconization method by Bayer process, it is characterized in that adding milk of lime in the stoste of desiliconization process before evaporation, carry out the solution desilicification reaction, carry out liquid-solid separation then, solution after the separation is through the circulation alkali liquor of evaporation concentration as stripping bauxite, and calcium-silicon slag is delivered to the allotment of sintering process charge pulp.
2. circulation alkali liquor desiliconization method by Bayer process according to claim 1, it is characterized in that the solution desilicification condition is: the desilication reaction temperature is 70～110 ℃, reaction times 30～120min, the effective calcium CaO of milk of lime
fAddition be 1～20g/l.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610103782 CN1907857A (en) | 2006-08-01 | 2006-08-01 | Circulation alkali liquor desiliconization method by Bayer process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610103782 CN1907857A (en) | 2006-08-01 | 2006-08-01 | Circulation alkali liquor desiliconization method by Bayer process |
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| Publication Number | Publication Date |
|---|---|
| CN1907857A true CN1907857A (en) | 2007-02-07 |
Family
ID=37699115
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|---|---|---|---|
| CN 200610103782 Pending CN1907857A (en) | 2006-08-01 | 2006-08-01 | Circulation alkali liquor desiliconization method by Bayer process |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102009992A (en) * | 2010-12-30 | 2011-04-13 | 中国铝业股份有限公司 | Method for slowing down scarring speed of evaporator |
| CN103288110A (en) * | 2013-06-24 | 2013-09-11 | 中国铝业股份有限公司 | Bayer method alumina production method |
| CN106044817A (en) * | 2016-08-16 | 2016-10-26 | 青川天隆新材料开发有限责任公司 | Normal pressure fine-desilication method for preparation of aluminum oxide |
| CN111204787A (en) * | 2020-02-05 | 2020-05-29 | 中铝中州铝业有限公司 | Method for joint production of aluminum oxide and steel refining slag |
-
2006
- 2006-08-01 CN CN 200610103782 patent/CN1907857A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102009992A (en) * | 2010-12-30 | 2011-04-13 | 中国铝业股份有限公司 | Method for slowing down scarring speed of evaporator |
| CN102009992B (en) * | 2010-12-30 | 2012-07-25 | 中国铝业股份有限公司 | Method for slowing down scarring speed of evaporator |
| CN103288110A (en) * | 2013-06-24 | 2013-09-11 | 中国铝业股份有限公司 | Bayer method alumina production method |
| CN106044817A (en) * | 2016-08-16 | 2016-10-26 | 青川天隆新材料开发有限责任公司 | Normal pressure fine-desilication method for preparation of aluminum oxide |
| CN111204787A (en) * | 2020-02-05 | 2020-05-29 | 中铝中州铝业有限公司 | Method for joint production of aluminum oxide and steel refining slag |
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