CN100396614C - Method for desiliconizing green liquor of sodium aluminate under normal pressure - Google Patents
Method for desiliconizing green liquor of sodium aluminate under normal pressure Download PDFInfo
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- CN100396614C CN100396614C CNB2006100448795A CN200610044879A CN100396614C CN 100396614 C CN100396614 C CN 100396614C CN B2006100448795 A CNB2006100448795 A CN B2006100448795A CN 200610044879 A CN200610044879 A CN 200610044879A CN 100396614 C CN100396614 C CN 100396614C
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- Prior art keywords
- white residue
- sodium aluminate
- desiliconization
- seed
- desilication
- 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.)
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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 45
- 229910001388 sodium aluminate Inorganic materials 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000012141 concentrate Substances 0.000 claims description 12
- 238000001914 filtration Methods 0.000 claims description 11
- 238000000926 separation method Methods 0.000 claims description 11
- 239000000706 filtrate Substances 0.000 claims description 10
- 239000004576 sand Substances 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 11
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 abstract description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 abstract description 3
- 238000005245 sintering Methods 0.000 abstract description 3
- 238000010438 heat treatment Methods 0.000 abstract 1
- 239000002245 particle Substances 0.000 abstract 1
- 238000010298 pulverizing process Methods 0.000 abstract 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 20
- 238000013019 agitation Methods 0.000 description 8
- 210000000582 semen Anatomy 0.000 description 5
- 239000000377 silicon dioxide Substances 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 230000004913 activation Effects 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 229910052733 gallium Inorganic materials 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 238000004131 Bayer process Methods 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 229910021502 aluminium hydroxide Inorganic materials 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 235000011116 calcium hydroxide Nutrition 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
Landscapes
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The present invention relates to an improved method for the desilication of the unrefined solution of sodium aluminate, which is used in the process of aluminum oxide production in sintering method. Activated white residue as seed is added in the unrefined solution of the sodium aluminate, after heating and heat preserving for the desiliconization, the solution is filtered and separated, and the obtained filtered liquor is the refined solution of the sodium aluminate after the desilication. The present invention is characterized in that the activated white residue as the seed is manufactured by pulverizing the white residue to the average particle diameter of 0.1 to 5 micrometer. The desilication method of the present invention has the advantages that the dosage of the activated white residue as the seed is about one sixth as the normal addition level of the seed, the time of the desilication is shortened to less than half of the prior art, the desilication process is optimized, and the labor productivity is greatly enhanced; the desilication time is short and the energy consumption is reduced, so the desilication process is optimized considerably after industrial application; the flow of liquid for desilication is increased under normal device condition, and the present invention can provide strong assurance for increasing the yield of the aluminium oxide.
Description
Technical field
The present invention relates to a kind of improved method for desiliconizing green liquor of sodium aluminate under normal pressure, be used for the alumina by sintering production process.
Background technology
In the sintering process for alumina production, the thick solution of sodium aluminate (without the sodium aluminate solution of desiliconization) needs the process desiliconization just can enter next step decomposition process.Traditional desilication method is the high pressure desiliconization, place the thick solution of sodium aluminate 5 kilograms pressure to keep 30 to 60 minutes down, make it that desilication reaction take place, solution after the desiliconization is called sodium aluminate concentrate solution, the weight ratio of aluminum oxide and silicon oxide is called alumina silica ratio in the seminal fluid, the alumina silica ratio of high pressure desiliconization seminal fluid meets the requirement of seed decomposition to seminal fluid greater than 300, and the seed that can be used for sodium aluminate solution decomposes.
Along with the development of the thick solution desilicification technology of sodium aluminate, the atmospheric silicon removing technology of sodium aluminate solution has appearred again now, promptly in the thick solution of sodium aluminate, add the white residue seed, stir under the condition Celsius about 100 ℃, make it that desilication reaction take place.The patent No. is the atmospheric silicon removing method of 03121954.3 crude liquor of sodium aluminate, byproduct-dealuminzation the slag that adopts Bayer process red mud and lime method to reclaim gallium is done desilicifying additive, byproduct-dealuminzation slag that this method makes lime method reclaim gallium has obtained comprehensive utilization, and has improved the efficient of crude liquor used sinter method atmospheric silicon removing; The patent No. is 200410037941.9 the thick solution desilicification method of high-concentration sodium aluminate, in desiliconization process, at first pressure is boiled the white residue after the desiliconization, add the activation of evaporation seed precipitation solution, the activation purpose is that solution tension boils the aluminium hydroxide of carrying secretly in the white residue, white residue after will activating then is as carrying out pre-desiliconization in the seed adding sodium aluminate solution, sodium aluminate solution after pre-desiliconization also needs to add milk of lime, carries out atmospheric silicon removing again, and the time is longer, there be 8-10 hour, the energy consumption height.
Summary of the invention
The object of the present invention is to provide a kind of improved method for desiliconizing green liquor of sodium aluminate under normal pressure, desiliconization time is short, and energy consumption is low.
Method for desiliconizing green liquor of sodium aluminate under normal pressure of the present invention, join in the crude liquor of sodium aluminate as seed with the activatory white residue, after the heat tracing desiliconization, with the solution filtering separation, gained filtrate is the sodium aluminate concentrate solution after the desiliconization, it is characterized in that it is that 0.1～5 μ m makes that activatory white residue seed is crushed to median size by white residue.Preferably pulverize by sand mill.
Optimal processing parameter control among the present invention is as follows:
The addition of activatory white residue seed is controlled to be 5～30g/l, the content of dried white residue seed in thick liquid.
The desiliconization holding temperature is controlled to be 90～120 ℃, wherein 120 ℃ of boiling points near sodium aluminate solution.
The desiliconization soaking time is controlled to be 1～5 hour, is keeping carrying out desiliconization under the state that stirs.
With the solution filtering separation, the alumina silica ratio of sodium aluminate concentrate solution can reach 300～400, satisfies the sodium aluminate solution seed fully and decomposes requirement, can carry out next step operation of alumina producing---and the sodium aluminate solution seed decomposes.
Carry out activation treatment producing the white residue of going up the desiliconization output, the white residue seed specific surface area after the activation increases greatly, and two kinds of white residue analytical resultss see the following form 1.
The specific surface area contrast table of the white residue of desiliconization output and activatory white residue seed in table 1, the production
| Project | Desiliconization white residue in the production | Activatory white residue seed |
| Specific surface area (m 2/g) | 0.124949 | 2.97488 |
As can be seen, the specific surface area of activatory white residue seed has increased nearly 25 times.
Desilication method of the present invention, activatory white residue seed consumption is about the sixth of conventional seed addition, desiliconization time foreshortens to less than original 1/2nd, has optimized desilication process, has improved labour productivity greatly.Desiliconization time is short, cuts down the consumption of energy, and after the industrial application, will optimize desilication process greatly, under normal appointed condition, increases the flow of desiliconization liquid, and producing for carrying of aluminum oxide provides strong assurance.
Embodiment
The present invention is further illustrated below in conjunction with embodiment.
Embodiment 1
With the desiliconization white residue on producing, be crushed to sand mill that to be broken to median size be 2 μ m, activatory white residue seed, activatory white residue seed is joined in the crude liquor of sodium aluminate, and add-on is 20g/l, is heated to 110 ℃, under agitation condition, be incubated desiliconization, 3 hours time.With the solution filtering separation, gained filtrate is the sodium aluminate concentrate solution after the desiliconization then, and the seminal fluid alumina silica ratio is 310.
Embodiment 2
With the desiliconization white residue on producing, be crushed to sand mill that to be broken to median size be 3.5 μ m, activatory white residue seed, activatory white residue seed is joined in the crude liquor of sodium aluminate, and add-on is 15g/l, is heated to 108 ℃, under agitation condition, be incubated desiliconization, 5 hours time.With the solution filtering separation, gained filtrate is the sodium aluminate concentrate solution after the desiliconization then, and the seminal fluid alumina silica ratio is 350.
Embodiment 3
With the desiliconization white residue on producing, be crushed to sand mill that to be broken to median size be 4.5 μ m, activatory white residue seed, activatory white residue seed is joined in the crude liquor of sodium aluminate, and add-on is 20g/l, is heated to 110 ℃, under agitation condition, be incubated desiliconization, 4.5 hours time.With the solution filtering separation, gained filtrate is the sodium aluminate concentrate solution after the desiliconization then.
Embodiment 4
With the desiliconization white residue on producing, be crushed to sand mill that to be broken to median size be 0.5 μ m, activatory white residue seed, activatory white residue seed is joined in the crude liquor of sodium aluminate, and add-on is 8g/l, is heated to 100 ℃, under agitation condition, be incubated desiliconization, 3.5 hours time.With the solution filtering separation, gained filtrate is the sodium aluminate concentrate solution after the desiliconization then.
Embodiment 5
With the desiliconization white residue on producing, be crushed to sand mill that to be broken to median size be 4 μ m, activatory white residue seed, activatory white residue seed is joined in the crude liquor of sodium aluminate, and add-on is 22g/l, is heated to 115 ℃, under agitation condition, be incubated desiliconization, 4 hours time.With the solution filtering separation, gained filtrate is the sodium aluminate concentrate solution after the desiliconization then.
Embodiment 6
With the desiliconization white residue on producing, be crushed to sand mill that to be broken to median size be 3 μ m, activatory white residue seed, activatory white residue seed is joined in the crude liquor of sodium aluminate, and add-on is 25g/l, is heated to 115 ℃, under agitation condition, be incubated desiliconization, 3.5 hours time.With the solution filtering separation, gained filtrate is the sodium aluminate concentrate solution after the desiliconization then.
Embodiment 7
With the desiliconization white residue on producing, be crushed to sand mill that to be broken to median size be 2.5 μ m, activatory white residue seed, activatory white residue seed is joined in the crude liquor of sodium aluminate, and add-on is 12g/l, is heated to 105 ℃, under agitation condition, be incubated desiliconization, 4 hours time.With the solution filtering separation, gained filtrate is the sodium aluminate concentrate solution after the desiliconization then.
Embodiment 8
With the desiliconization white residue on producing, be crushed to sand mill that to be broken to median size be 2 μ m, activatory white residue seed, activatory white residue seed is joined in the crude liquor of sodium aluminate, and add-on is 10g/l, is heated to 100 ℃, under agitation condition, be incubated desiliconization, 3 hours time.With the solution filtering separation, gained filtrate is the sodium aluminate concentrate solution after the desiliconization then.
Claims (1)
1. method for desiliconizing green liquor of sodium aluminate under normal pressure, join in the crude liquor of sodium aluminate as seed with the activatory white residue, after the heat tracing desiliconization, with the solution filtering separation, gained filtrate is the sodium aluminate concentrate solution after the desiliconization, it is characterized in that it is that 0.1～5 μ m makes that activatory white residue seed is crushed to median size by white residue, wherein, white residue is pulverized by sand mill, the addition of activatory white residue seed is 5～30g/l, the desiliconization holding temperature is 90～120 ℃, and the desiliconization soaking time is 1～5 hour, is keeping carrying out desiliconization under the state that stirs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100448795A CN100396614C (en) | 2006-06-14 | 2006-06-14 | Method for desiliconizing green liquor of sodium aluminate under normal pressure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100448795A CN100396614C (en) | 2006-06-14 | 2006-06-14 | Method for desiliconizing green liquor of sodium aluminate under normal pressure |
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| CN1872694A CN1872694A (en) | 2006-12-06 |
| CN100396614C true CN100396614C (en) | 2008-06-25 |
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| CNB2006100448795A Active CN100396614C (en) | 2006-06-14 | 2006-06-14 | Method for desiliconizing green liquor of sodium aluminate under normal pressure |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102936023A (en) * | 2012-10-19 | 2013-02-20 | 中信重工机械股份有限公司 | Aluminum hydroxide crystal seed processing method |
| CN105836776B (en) * | 2016-03-24 | 2018-02-23 | 中铝山东有限公司 | Active white residue, its preparation method, siliceous sodium aluminate desilication method |
| CN110563011A (en) * | 2019-09-12 | 2019-12-13 | 西南能矿集团股份有限公司 | Desiliconization agent for preparing alumina and preparation method thereof |
| CN112974476A (en) * | 2021-02-06 | 2021-06-18 | 达州励志环保科技有限公司 | Method for treating aluminum ash by using caustic soda |
Citations (2)
| 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 |
-
2006
- 2006-06-14 CN CNB2006100448795A patent/CN100396614C/en active Active
Patent Citations (2)
| 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 |
Non-Patent Citations (4)
| Title |
|---|
| 氧化铝生产中的钠硅渣. 刘桂华，范旷生，李小斌.轻金属，第2期. 2006 |
| 氧化铝生产中的钠硅渣. 刘桂华，范旷生，李小斌.轻金属，第2期. 2006 * |
| 添加晶种低温脱硅及其动力学. 罗玉长.轻金属，第11期. 1999 |
| 添加晶种低温脱硅及其动力学. 罗玉长.轻金属，第11期. 1999 * |
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| CN1872694A (en) | 2006-12-06 |
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Owner name: CHINESE ALUMINIUM CO., LTD. Free format text: FORMER OWNER: SHANDONG ALUMINIUM INDUSTRY CO., LTD. Effective date: 20071102 |
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Effective date of registration: 20071102 Address after: 100082 No. 62 North Main Street, Beijing, Xizhimen Applicant after: Aluminum Corporation of China Limited Address before: 255052 No. 1, five km road, Zhangdian District, Shandong, Zibo Applicant before: Shandong Aluminium Industry Co., Ltd. |
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