CN100548883C - Small two-stage method aluminium hydroxide crystal seed decomposing method - Google Patents
Small two-stage method aluminium hydroxide crystal seed decomposing method Download PDFInfo
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- CN100548883C CN100548883C CNB2007100155750A CN200710015575A CN100548883C CN 100548883 C CN100548883 C CN 100548883C CN B2007100155750 A CNB2007100155750 A CN B2007100155750A CN 200710015575 A CN200710015575 A CN 200710015575A CN 100548883 C CN100548883 C CN 100548883C
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- Prior art keywords
- agglomeration
- decomposition
- aluminium hydroxide
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- seed
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- 238000000034 method Methods 0.000 title claims abstract description 43
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 title claims abstract description 15
- 229910021502 aluminium hydroxide Inorganic materials 0.000 title claims abstract description 15
- 239000013078 crystal Substances 0.000 title claims abstract description 13
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 37
- 238000005054 agglomeration Methods 0.000 claims abstract description 20
- 230000002776 aggregation Effects 0.000 claims abstract description 20
- 239000000047 product Substances 0.000 claims abstract description 16
- 239000012065 filter cake Substances 0.000 claims abstract description 6
- 239000002002 slurry Substances 0.000 claims abstract description 5
- 238000007599 discharging Methods 0.000 claims abstract description 3
- JTJMJGYZQZDUJJ-UHFFFAOYSA-N phencyclidine Chemical class C1CCCCN1C1(C=2C=CC=CC=2)CCCCC1 JTJMJGYZQZDUJJ-UHFFFAOYSA-N 0.000 claims abstract description 3
- 238000001556 precipitation Methods 0.000 claims abstract description 3
- 239000004576 sand Substances 0.000 abstract description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 7
- 229910052782 aluminium Inorganic materials 0.000 description 7
- 239000012530 fluid Substances 0.000 description 7
- 239000004411 aluminium Substances 0.000 description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 4
- 238000005868 electrolysis reaction Methods 0.000 description 2
- 210000000582 semen Anatomy 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical group [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 description 1
- 229910001570 bauxite Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 229910001388 sodium aluminate Inorganic materials 0.000 description 1
- 150000004684 trihydrates Chemical class 0.000 description 1
Landscapes
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The present invention relates to a kind of small two-stage method aluminium hydroxide crystal seed decomposing method, to plant branch decomposition discharging utilizes two-stage cyclones to carry out classification, the underflow of one-level swirler removes to wash out finished product aluminium hydroxide, the overflow of one-level swirler is thrown second cyclone into pump, filter cake after it is characterized in that the second cyclone overflow filtered by thin seed filter carries out agglomeration with 20～50% decomposition stoste at the agglomeration seed precipitation tank, and the intact slurries of agglomeration enter the first groove of growing up after lowering the temperature; Filter cake after the second cyclone underflow filtered by thick seed filter and remaining decomposition stoste still adopt one-stage process to enter to grow up first groove to decompose continuously.Solve the problem of product sand shape, improved quality product, can obtain higher rate of decomposition simultaneously.
Description
Technical field
The present invention relates to a kind of improved aluminium hydroxide crystal seed decomposition method, belong to the production technique of aluminum oxide.
Background technology
The decomposition of sodium aluminate solution is mainly adopted carbon divide to decompose and planted and decompose two kinds, plants to decompose generally to be divided into two kinds of one-stage process and two-phase methods: one-stage process is lowered the temperature exactly and is decomposed stoste (generally reducing to below 75 ℃) and add not classification crystal seed and decompose; Two-phase method be exactly comparatively high temps (general 75 ℃～85 ℃) decomposition stoste at first with classification after the fine particle crystal seed carry out adding after the high temperature agglomeration decomposition of progressively lowering the temperature of coarse particles crystal seed.Wherein one-stage process (height contains admittedly) rate of decomposition is higher, but size indicator is undesirable, generally produces flour alumina; Two-phase method (admittedly containing low) rate of decomposition is low, but size indicator is good, generally produces sandy alumina.Therefore how to take into account the advantage of one-stage process and two-stage method, and avoid its shortcoming, under the prerequisite that improves product granularity, do not influence the point of penetration that aluminum oxide output becomes technological innovation again.
Aluminum electrolysis industry uses sandy alumina to carry out electrolysis in order to reduce the airborne dust loss of aluminum oxide, more and more to bias toward.The at present domestic import bauxite trihydrate that utilizes adopts low temperature bayer's process dissolving-out process to produce aluminum oxide, what its decomposition technique adopted is the one-stage process aluminium hydroxide crystal seed decomposition of standard, aluminium hydroxide product granularity-45 μ content average out to 39%, do not reach the index request of sandy alumina far away, and presenting obvious periodic refinement phenomenon, the general refinement cycle was at 1-2 month.
Summary of the invention
The object of the present invention is to provide a kind of small two-stage method aluminium hydroxide crystal seed decomposing method, solved the problem of product sand shape, improved quality product, can obtain higher rate of decomposition simultaneously.
Small two-stage method aluminium hydroxide crystal seed decomposing method of the present invention, to plant branch decomposition discharging utilizes two-stage cyclones to carry out classification, the underflow of one-level swirler removes to wash out finished product aluminium hydroxide, the overflow of one-level swirler is thrown second cyclone into pump, filter cake (thin seed) after the second cyclone overflow filtered by thin seed filter carries out agglomeration with 20～50% decomposition stoste (seminal fluid) at the agglomeration seed precipitation tank, and the intact slurries of agglomeration enter the first groove of growing up after by cooling; Filter cake after the second cyclone underflow filtered by thick seed filter and remaining decomposition stoste (seminal fluid) still adopt one-stage process to enter to grow up first groove to decompose continuously.
Wherein: the agglomeration temperature is 75～85 ℃, enters the first groove of growing up after the intact slurries of agglomeration are cooled to 60～65 ℃.
Small two-stage method aluminium hydroxide crystal seed decomposing method of the present invention combines the advantage of one-stage process and two-phase method in kind of the branch decomposition technique, has both solved the agglomeration problem of thin seed, has guaranteed higher rate of decomposition again.The aluminium hydroxide of its explained hereafter-45 μ content is on average less than 16%, and rate of decomposition is greater than 52%, and output capacity reaches 84.84kg-A0/M
3-seminal fluid is with product aluminium hydroxide-45 μ content average 39% and output capacity 84.28kg-A0/m before this
3-seminal fluid ratio has improved 58.97% and 0.7% respectively, and the quality of product and output have obtained novelty and broken through and qualitative leap.And have flow process characteristics reasonable, simple to operate, have good economic benefit and social benefit.
Description of drawings
Fig. 1 is a process flow diagram of the present invention.
Embodiment
The invention will be further described below in conjunction with embodiment.
Embodiment 1
81 ℃ of decomposition stostes with 20% are carried out the high temperature agglomeration, and other 80% decomposition stoste is cooled to 61 ℃ and adopts one-stage processes to decompose, product aluminium hydroxide-45 μ content average out to 14.5%, and rate of decomposition is 52.12%, output capacity is 84.84kg-A0/m
3-seminal fluid.
Embodiment 2
81 ℃ of decomposition stostes with 25% are carried out the high temperature agglomeration, and other 75% decomposition stoste is cooled to 61 ℃ and adopts one-stage processes to decompose, product aluminium hydroxide-45 μ content average out to 12.5%, and rate of decomposition is 52.75%, output capacity is 85.02kg-A0/M
3-seminal fluid.
Embodiment 3
78 ℃ of decomposition stostes with 45% are carried out the high temperature agglomeration, and other 55% decomposition stoste is cooled to 63 ℃ and adopts one-stage processes to decompose, product aluminium hydroxide-45 μ content average out to 13.5%, and rate of decomposition is 52.35%, output capacity is 85.01kg-A0/m
3-seminal fluid.
Embodiment 4
83 ℃ of decomposition stostes with 35% are carried out the high temperature agglomeration, and other 65% decomposition stoste is cooled to 62 ℃ and adopts one-stage processes to decompose, product aluminium hydroxide-45 μ content average out to 13.4%, and rate of decomposition is 52.34%, output capacity is 84.03kg-A0/m
3-seminal fluid.
Embodiment 5
85 ℃ of decomposition stostes with 30% are carried out the high temperature agglomeration, and other 70% decomposition stoste is cooled to 60 ℃ and adopts one-stage processes to decompose, product aluminium hydroxide-45 μ content average out to 12.4%, and rate of decomposition is 52.24%, output capacity is 84.13kg-A0/m
3-seminal fluid.
Claims (2)
1, a kind of small two-stage method aluminium hydroxide crystal seed decomposing method, to plant branch decomposition discharging utilizes two-stage cyclones to carry out classification, the underflow of one-level swirler removes to wash out finished product aluminium hydroxide, the overflow of one-level swirler is thrown second cyclone into pump, filter cake after it is characterized in that the second cyclone overflow filtered by thin seed filter carries out agglomeration with 20～50% decomposition stoste at the agglomeration seed precipitation tank, and the intact slurries of agglomeration enter the first groove of growing up after lowering the temperature; Filter cake after the second cyclone underflow filtered by thick seed filter and remaining decomposition stoste still adopt one-stage process to enter to grow up first groove to decompose continuously.
2, small two-stage method aluminium hydroxide crystal seed decomposing method according to claim 1 is characterized in that the agglomeration temperature is 75～85 ℃, enters the first groove of growing up after the intact slurries of agglomeration are cooled to 60～65 ℃.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100155750A CN100548883C (en) | 2007-05-30 | 2007-05-30 | Small two-stage method aluminium hydroxide crystal seed decomposing method |
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|---|---|---|---|
| CNB2007100155750A CN100548883C (en) | 2007-05-30 | 2007-05-30 | Small two-stage method aluminium hydroxide crystal seed decomposing method |
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| Publication Number | Publication Date |
|---|---|
| CN101070170A CN101070170A (en) | 2007-11-14 |
| CN100548883C true CN100548883C (en) | 2009-10-14 |
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| CNB2007100155750A Active CN100548883C (en) | 2007-05-30 | 2007-05-30 | Small two-stage method aluminium hydroxide crystal seed decomposing method |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103130253B (en) * | 2011-11-25 | 2015-04-08 | 贵阳铝镁设计研究院有限公司 | Two stage decomposition process method of Bayer process alumina production |
| CN103159241A (en) * | 2011-12-15 | 2013-06-19 | 贵阳铝镁设计研究院有限公司 | Two-section decomposition process for alumina production by Bayer process |
| CN102807241B (en) * | 2012-08-27 | 2015-04-29 | 中国铝业股份有限公司 | Bayer process for producing sandy alumina |
| CN103848453B (en) * | 2012-11-28 | 2015-09-30 | 沈阳铝镁设计研究院有限公司 | A kind of method reducing the refinement of seeded precipitation Period Process |
| CN106986362A (en) * | 2017-04-12 | 2017-07-28 | 柳健康 | A kind of sodium aluminate solution high concentration is low admittedly containing one section of seeded precipitation technique |
| CN108147772A (en) * | 2017-12-07 | 2018-06-12 | 常州市日臣艺术装饰材料有限公司 | A kind of marmorean preparation method of cracking resistance transparent synthetic |
| CN114130324A (en) * | 2021-12-01 | 2022-03-04 | 沈阳铝镁设计研究院有限公司 | Flood absorption synergistic decomposition system |
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| CN101070170A (en) | 2007-11-14 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20071026 Address after: No. 62 North Main Street, Beijing, Xizhimen Applicant after: Aluminum Corporation of China Limited Address before: No. five, 1 km road, Zhangdian District, Shandong, Zibo Applicant before: Shandong Aluminium Industry Co., Ltd. |
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