CN102531003B - Method and system for producing sandy aluminum oxide through three-section seed decomposition - Google Patents
Method and system for producing sandy aluminum oxide through three-section seed decomposition Download PDFInfo
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- CN102531003B CN102531003B CN201010576257.3A CN201010576257A CN102531003B CN 102531003 B CN102531003 B CN 102531003B CN 201010576257 A CN201010576257 A CN 201010576257A CN 102531003 B CN102531003 B CN 102531003B
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- seed
- section
- decomposer
- decomposition
- seeds
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- 238000000034 method Methods 0.000 title abstract description 28
- 238000000354 decomposition reaction Methods 0.000 title abstract description 24
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 title abstract 4
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims abstract description 11
- 238000005406 washing Methods 0.000 claims abstract description 11
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 15
- 229910021502 aluminium hydroxide Inorganic materials 0.000 claims description 9
- 239000006210 lotion Substances 0.000 claims description 7
- 210000000582 semen Anatomy 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 230000008676 import Effects 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 abstract description 10
- 238000007599 discharging Methods 0.000 abstract description 9
- 238000001914 filtration Methods 0.000 abstract description 8
- 238000004131 Bayer process Methods 0.000 abstract description 6
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 abstract description 5
- 238000001816 cooling Methods 0.000 abstract description 5
- 239000011362 coarse particle Substances 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 239000010419 fine particle Substances 0.000 abstract description 3
- 230000005484 gravity Effects 0.000 abstract description 2
- 239000012530 fluid Substances 0.000 abstract 2
- 238000002156 mixing Methods 0.000 abstract 2
- 238000005194 fractionation Methods 0.000 abstract 1
- 238000004886 process control Methods 0.000 abstract 1
- 238000003756 stirring Methods 0.000 abstract 1
- 239000013078 crystal Substances 0.000 description 4
- 238000000926 separation method Methods 0.000 description 3
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 235000019628 coolness Nutrition 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 239000003599 detergent Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
Landscapes
- Pretreatment Of Seeds And Plants (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention relates to a method for producing sandy aluminum oxide through three-section seed decomposition in a process of producing aluminum oxide with a Bayer process or in a Bayer process part of a combined process. The method for producing the sandy aluminum oxide through three-section seed decomposition comprises the steps of: mixing fine fluid with seeds; feeding into a first-section decomposition groove; discharging; performing first-stage cooling; feeding into a second-section decomposition groove; forming a necessary gravity fractionation layer in the decomposition groove by controlling proper stirring intensity; and drawing out coarse particles from the bottom of the groove and taking the coarse particles as aluminum hydroxide products; performing second-stage cooling on overflow containing fine particles at the upper part; feeding into a third-section decomposition groove; separating the underflow; performing seed filtering and washing processes; mixing the filtered seeds with the fine fluid; returning to the first-section decomposition groove; and performing an oxalate removing process on a seed washing solution after the seeds are washed. According to the method and system provided by the invention, by adoption of the three-section decomposition technology, the positions of the products to be output and the seeds are respectively arranged in the first-section and third-section decomposition grooves, so that the aims of obtaining high-quality aluminum hydroxide product, realizing high yield and flexible process control and facilitating the removal of oxalate are achieved.
Description
Technical field
The present invention relates to, in a kind of alumina producing of the part of the Bayer process in Bayer process or integrated process, adopt the method for three sections of producing sandy alumina through decomposing seeds
and system, belong to technical field of alumina production.
Background technology
The popular decomposition technique of China has two kinds at present, one section of decomposition technique technology that a kind of Wei Yi Bi Shinie Chinalco technology is representative, be that seminal fluid enters the first groove of decomposition together with seed, stop after the sufficiently long time, decomposer discharging is through scalping, underflow send square position filter progress as aluminium hydroxide finished product, overflow is returned and is decomposed first groove as seed after filter filters, its technological core is mainly by crystal growth, adopt lower decomposition first-cell temperature, high seed ratio, one section of classification, one section adds the decomposition technique of planting.This decomposition technique flow process is simple, but the Crystal of sandy alumina is lower, is prone to periodic thinning during production.Two sections of decomposition technique technology that the second Wei Yi Switzerland Chinalco technology is representative, be that seminal fluid enters one section of first groove of decomposition together with thin seed, one section of decomposer discharging removes to rush thick seed after intersegmental cooling, send again two sections to decompose first groove, stop after the sufficiently long time, decomposer discharging is through first step classification, classification underflow send square position filter progress as finished product, overflow is returned to decomposer or is gone second stage classification, classification underflow returns to two sections as thick seed after filtering and decomposes first groove, overflow is returned to one section as thin seed after filtering and is decomposed first groove after sedimentation, its technological core is mainly by crystallization agglomeration, adopt two sections of classifications, two sections add the decomposition technique of planting.The alumina crystal intensity that this method is produced is better, but decomposition process is long, and two sections all adopt full flow classification, and treatment capacity is quite large, and facility investment expense is higher, and working cost is also very large.
Summary of the invention
The present invention is exactly a kind of method that three sections of producing sandy alumina through decomposing seeds are provided in order to solve the problems of the technologies described above
and system, object is in order to obtain high yield, product that granularity is qualified, and technology controlling and process is flexible, is conducive to the eliminating of oxalate.
In order to solve the problems of the technologies described above, the present invention is achieved in that a kind of method of three sections of producing sandy alumina through decomposing seeds, in the alumina producing of the Bayer process part of Bayer process or integrated process, adopt three sections of decomposition, twice intermediate temperature drop and subsider scalping.
Three sections of described seeds decompose employing seed addition in first paragraph decomposer.
Three sections of described seeds decompose the discharging of employing second segment decomposer underflow and do product.
Three sections of described seeds decompose employing second segment decomposer overflow discharging and go the 3rd section of decomposition.
Three sections of described seeds decompose the 3rd section of decomposer discharging of employing and go subsider scalping, separated overflow devaporation; Separating underflow send seed to filter.
Three sections of described seeds decompose seed filtration fraction and adopt the filter with separation, washing function.
Three sections of described seeds decompose the washing lotion of seed filtration fraction kind seed detergent and send oxalate to remove.
A kind of system of three sections of producing sandy alumina through decomposing seeds, by following structure, formed: the first paragraph decomposer that receives seminal fluid and seed, be connected first step heat sink with first paragraph decomposer, the second segment decomposer being connected with first step heat sink, the second stage heat sink being connected with second segment decomposer, the 3rd section of decomposer being connected with second stage heat sink, with the 3rd section of subsider that decomposer is connected, the seed filter being connected with subsider, second segment bottom part of decomposer is provided with aluminium hydroxide products export, subsider top is provided with separated overflow port, subsider bottom is provided with separating underflow mouth, after the separating underflow of seed filter reception subsider filters, seed is delivered to first paragraph decomposer.
Described seed filter is provided with wash water import, and the bottom of seed filter is provided with the outlet of seed washing lotion.
The present invention compared with prior art, there is quality product high, the advantages such as technology controlling and process is flexible, owing to adopting this new decomposition technique, the aluminium hydroxide of producing is gravity classification in second segment decomposer, and bottom land coarse particles is as product aluminium hydroxide, top overflow enters the 3rd section of decomposer containing a large amount of fine particles, continue to grow up, be conducive to the carrying out that seed filters, output capacity is high.The sandy alumina intensity of producing is high, and coarse size, decomposes and the main economic and technical indices of seed filtration procedure all remains on higher level.
Accompanying drawing explanation
Fig. 1 is process flow sheet of the present invention.
In accompanying drawing: 1, seminal fluid; 2, first paragraph decomposer; 3, first step heat sink; 4, second segment decomposer; 5, second stage heat sink; 6, the 3rd section of decomposer; 7, subsider; 8, separated overflow port; 9, separating underflow mouth; 10, seed filter; 11, wash water import; 12, seed washing lotion outlet; 13, seed; 14, aluminium hydroxide products export.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described, but protection scope of the present invention is not limit by embodiment.
Embodiment 1: the schema that is as shown in Figure 1 the method for a kind of three sections of producing sandy alumina through decomposing seeds of the present invention, seminal fluid 1 is mixed into first paragraph decomposer 2 with seed 13, discharging enters second segment decomposer 4 after 3 coolings of first step heat sink, and bottom land coarse particles send aluminium hydroxide filter progress as aluminium hydroxide product; Groove top fine particle enters second stage heat sink 5, after cooling, enter the 3rd section of decomposer 6, after crystal growth, discharging enters subsider 7 separation, separated overflow is that decomposition nut liquid send evaporization process, separating underflow send seed filter 10, and the seed 13 filtering out returns to first paragraph decomposer 2, adds the seed washing lotion obtaining after wash water to send to oxalate and removes.
It is the method that adopts twice intermediate temperature drop that three sections of above-mentioned seeds decompose.
Three sections of described seeds decompose seed filtration fraction and adopt the filter with separation, washing function to filter.
A kind of system of three sections of producing sandy alumina through decomposing seeds, by following structure, formed: the first paragraph decomposer 2 that receives seminal fluid 1 and seed 13, be connected first step heat sink 3 with first paragraph decomposer 2, the second segment decomposer 4 being connected with first step heat sink 3, the second stage heat sink 5 being connected with second segment decomposer 4, the 3rd section of decomposer 6 being connected with second stage heat sink 5, with the 3rd section of subsider that decomposer 6 is connected 7, the seed filter 10 being connected with subsider 7, second segment decomposer 4 bottoms are provided with aluminium hydroxide products export 14, subsider 7 tops are provided with separated overflow port 8, subsider 7 bottoms are provided with separating underflow mouth 9, after the separating underflow that seed filter 10 receives subsider 7 filters, seed 13 is delivered to first paragraph decomposer 2, seed filter 10 is provided with wash water import 11, the bottom of seed filter 10 is provided with seed washing lotion outlet 12.
Embodiment 2: as shown in Figure 1, except not adding wash water, do not have outside seed washing lotion burring hydrochlorate causticization, all the other are all identical with embodiment 1.
Claims (2)
1. the system of three sections of producing sandy alumina through decomposing seeds, it is characterized in that being formed by following structure: the first paragraph decomposer that receives seminal fluid and seed, be connected first step heat sink with first paragraph decomposer, the second segment decomposer being connected with first step heat sink, the second stage heat sink being connected with second segment decomposer, the 3rd section of decomposer being connected with second stage heat sink, with the 3rd section of subsider that decomposer is connected, the seed filter being connected with subsider, second segment bottom part of decomposer is provided with aluminium hydroxide products export, subsider top is provided with separated overflow port, subsider bottom is provided with separating underflow mouth, after the separating underflow of seed filter reception subsider filters, seed is delivered to first paragraph decomposer.
2. the system of a kind of three sections of producing sandy alumina through decomposing seeds according to claim 1, is characterized in that described seed filter is provided with wash water import, and the bottom of seed filter is provided with the outlet of seed washing lotion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010576257.3A CN102531003B (en) | 2010-12-07 | 2010-12-07 | Method and system for producing sandy aluminum oxide through three-section seed decomposition |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010576257.3A CN102531003B (en) | 2010-12-07 | 2010-12-07 | Method and system for producing sandy aluminum oxide through three-section seed decomposition |
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| Publication Number | Publication Date |
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| CN102531003A CN102531003A (en) | 2012-07-04 |
| CN102531003B true CN102531003B (en) | 2014-04-30 |
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| CN201010576257.3A Expired - Fee Related CN102531003B (en) | 2010-12-07 | 2010-12-07 | Method and system for producing sandy aluminum oxide through three-section seed decomposition |
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| CN110156055B (en) * | 2019-07-01 | 2021-11-09 | 济源职业技术学院 | Process for preventing periodic thinning of seed distribution in Bayer process alumina production |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0997435A1 (en) * | 1998-10-28 | 2000-05-03 | Alusuisse Technology & Management AG | Process for the manufacture of coarse aluminium hydroxide |
| CN1556035A (en) * | 2003-12-31 | 2004-12-22 | 中国铝业股份有限公司 | Sandlike aluminium oxide disintegration technology |
| CN1962448A (en) * | 2006-11-23 | 2007-05-16 | 沈阳铝镁设计研究院 | Two-stage decomposition for producing sand-like alumina product and seed classification process |
| CN101092242A (en) * | 2007-05-22 | 2007-12-26 | 山东铝业股份有限公司 | Three stages, two seeds technique of seed crystal decomposition |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201882928U (en) * | 2010-12-07 | 2011-06-29 | 中铝国际技术发展有限公司 | Three-section system for producing sandy alumina through seed decomposition |
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- 2010-12-07 CN CN201010576257.3A patent/CN102531003B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0997435A1 (en) * | 1998-10-28 | 2000-05-03 | Alusuisse Technology & Management AG | Process for the manufacture of coarse aluminium hydroxide |
| CN1556035A (en) * | 2003-12-31 | 2004-12-22 | 中国铝业股份有限公司 | Sandlike aluminium oxide disintegration technology |
| CN1962448A (en) * | 2006-11-23 | 2007-05-16 | 沈阳铝镁设计研究院 | Two-stage decomposition for producing sand-like alumina product and seed classification process |
| CN101092242A (en) * | 2007-05-22 | 2007-12-26 | 山东铝业股份有限公司 | Three stages, two seeds technique of seed crystal decomposition |
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| CN102531003A (en) | 2012-07-04 |
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