CN101955213B - Sodium aluminate solution piston-flow seed crystal decomposing tank - Google Patents
Sodium aluminate solution piston-flow seed crystal decomposing tank Download PDFInfo
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- CN101955213B CN101955213B CN 201010291856 CN201010291856A CN101955213B CN 101955213 B CN101955213 B CN 101955213B CN 201010291856 CN201010291856 CN 201010291856 CN 201010291856 A CN201010291856 A CN 201010291856A CN 101955213 B CN101955213 B CN 101955213B
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- sodium aluminate
- aluminate solution
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Abstract
The invention discloses a sodium aluminate solution piston-flow seed crystal decomposing tank, belonging to a decomposition and crystallization chemical reaction device. The invention aims at providing a sodium aluminate solution piston-flow seed crystal decomposing tank which has low cost and can improve the quality grades of aluminum oxide products. The sodium aluminate solution piston-flow seed crystal decomposing tank comprises a decomposing tank, a rotary shaft and a discharging pipe, wherein an electric motor and a discharging chute are fixed on the decomposing tank; the rotary shaft is connected with the electric motor; the discharging pipe is communicated with the discharging chute and inserted with a material-lifting air pipe; a sleeve pipe (5) fixed in the decomposing tank (2) is sleeved on the rotary shaft (3) in an idle way, a material collecting barrel (8) movably connected with the sleeve pipe (5) is fixed on the rotary shaft (3), and a feeding pipe (7) provided with a feeding hole (9) is fixed on the material collecting barrel (8) and communicated with the material collecting barrel (8); and the other end of the discharging pipe (11) is communicated with the sleeve pipe (5), and sealing elements (10) are arranged among the sleeve pipe, the rotary shaft (3) and the material collecting barrel (8). The sodium aluminate solution piston-flow seed crystal decomposing tank can improve the grain sizes of the aluminum oxide products, has low manufacturing cost and less power consumption and is ideal equipment of producing aluminum hydroxide.
Description
Technical field: the present invention relates to a kind of decomposition and crystallization chemical reaction equipment, relate in particular to a kind of supersaturated sodium aluminate solution decomposition of crystal seed groove.
Background technology: China is one of major country of production of aluminum oxide.At present China adopts the aluminum oxide that Bayer process produces not only energy consumption of unit product is high, and the granularity of aluminum oxide does not reach the desired sand shape of international standard quality grade mostly between sand shape and powdery; Its reason mainly is to exist due to the defective in the sodium aluminate solution crystal seed decomposer structure design.At present, supersaturated sodium aluminate solution decomposition of crystal seed groove mostly is greatly flat straight barrel structure, and the inwall of this barrel vertically is fixed with the pipeline for delivery of reaction product (aluminum hydroxide crystals); Blocking-up is produced continuously in order to prevent aluminum hydroxide crystals that crystallization reaction produces in bottom part of decomposer deposit buildup, hydrolysis caking, usually all will erect a mechanical stirring device with multi-layer oar blade is set uninterruptedly stirs in decomposer.Although leaf slurry strong stirring can prevent that xln from precipitating at bottom part of decomposer, but cause and produce shearing force in the sodium aluminate solution flow field, this shearing force can make the crystalline aluminum hydroxide growth process be destroyed on the one hand, cause again refinement of xln, cause the finished product (aluminum oxide) granularity mostly between sand shape and powdery, do not reach the international standard requirement of sandy alumina product; Also can cause on the other hand between the upper and lower layer liquid mutually to mix (being commonly called as " short circuit "), thereby cause product hierarchy to descend.In addition, because mechanical stirring device reaches tens of rice, it is larger to stir load, therefore not only the manufacturing of the members such as the stir shaft of agitator, agitating vane is had relatively high expectations, and energy consumption is also larger.
Summary of the invention: for the defects that exists in the prior art, the present invention aims to provide a kind of low cost of manufacture, can improve the sodium aluminate solution piston-flow seed crystal decomposing tank of alumina product quality grade.
To achieve these goals, the present invention is by the following technical solutions: it comprise the top be fixed with the decomposer of electric motor, vertically be located at the turning axle that is connected with described electric motor in this decomposer, the discharging chute that is fixed on described decomposer inwall, the discharge nozzle that is communicated with this discharging chute bottom, be inserted in and carry the material airduct in this discharge nozzle; Be fixed on sleeve pipe empty set in the decomposer on turning axle, the aggregate tube that is flexibly connected with sleeve pipe is fixed on this turning axle, and a few feed-pipe that is provided with some feed ports is fixed on the aggregate tube and is communicated with it; The other end of discharge nozzle is communicated with sleeve pipe, is provided with sealing element between this sleeve pipe and turning axle and the aggregate tube.
Feed-pipe level or downward-sloping layout, feed port are distributed in bottom and the termination of this feed-pipe.
Compared with the prior art, therefore the present invention has the following advantages owing to adopted technique scheme, makes a concrete analysis of as follows:
1) owing to increased the members such as the aggregate tube that can rotate with turning axle and feed-pipe in the bottom of decomposer, therefore can realize at bottom part of decomposer the function of Large-Area-Uniform suction, discharging, effectively overcome the difficult problem that bottom part of decomposer easily precipitates buildup;
2) owing to cancelled some paddles of arranging along the turning axle multilayer, therefore greatly alleviate the load of whipping appts, not only can reduce and use electric consumption, but also reduced the manufacture difficulty of the members such as turning axle, bearing;
3) owing to there is not strong stirring movement, the shearing force that does not exist strong stirring to cause in the sodium aluminate solution flow field in the decomposer, the solution crystallization reaction can not cause to carry out steadily, continuously like the mode of nearly " plug flow " any stirring, therefore the aluminum hydroxide crystals growth process can not destroyed, thereby is easy to obtain the larger alumina product of granularity.
Description of drawings:
Fig. 1 is structural representation of the present invention.
Among the figure: electric motor 1 decomposer 2 turning axles 3 paddles 4 sleeve pipes 5 are reinforced pull bar 6 feed-pipes 7 aggregate tubes 8 feed ports 9 sealing elements 10 discharge nozzles 11 and are carried material airduct 12 discharging chutes 13
Embodiment: the invention will be further described below in conjunction with accompanying drawing and specific embodiment:
As shown in Figure 1: electric motor 1 is fixed on the top of decomposer 2, turning axle 3 vertical the stretching in the decomposer 2 that are connected with electric motor 1; Be fixed with discharging chute 13 near the inwall place of this decomposer upper part, the bottom of this discharging chute is fixed with and is communicated with it and discharge nozzle straight down 11, be inserted with in this discharge nozzle stretch out decomposer 2 carry material airduct 12.At the free sleeve pipe 5 that is enclosed within on this turning axle in the lower end of close turning axle 3, this sleeve pipe is fixed in the decomposer 13 by reinforcing pull bar 6; The lower end of sleeve pipe 5 has and is fixed on the turning axle 3 and is communicated with this aggregate tube with feed-pipe 7 that 8, three levels of aggregate tube that this sleeve pipe is flexibly connected are evenly arranged, and the bottom of each feed-pipe 7 and termination are provided with some feed ports 9; The lower end of discharge nozzle 11 is communicated with sleeve pipe 5, is equipped with sealing element 10 between turning axle 3 and the sleeve pipe 5 and between sleeve pipe 5 and the aggregate tube 8.In order to improve feed-pipe 7 rigidity, between each feed-pipe 7 and aggregate tube 8, be welded with and reinforce pull bar 6.
During work, electric motor 1 drives aggregate tube 8 by turning axle 3 and feed-pipe 7 slowly rotates, and aluminum hydroxide slurry enters feed-pipe 7 from opening for feed 9, enters in the discharging chute 13 by discharge nozzle 11 through aggregate tube 8 and sleeve pipe 5 under the effect of carrying material airduct 12.Therefore the present invention has alleviated the load of electric motor 1 owing to cancelled original paddle 4 along turning axle 3 Multi-layers distributings, uses electric consumption 10-20% thereby can reduce.
Claims (2)
1. sodium aluminate solution piston-flow seed crystal decomposing tank, comprise the top be fixed with the decomposer of electric motor, vertically be located at the turning axle that is connected with described electric motor in this decomposer, the discharging chute that is fixed on described decomposer inwall, the discharge nozzle that is communicated with this discharging chute bottom, be inserted in and carry the material airduct in this discharge nozzle; It is characterized in that: be fixed on sleeve pipe (5) empty set in the decomposer (2) on turning axle (3), the aggregate tube (8) that is flexibly connected with sleeve pipe (5) is fixed on this turning axle, and at least one feed-pipe (7) that is provided with some feed ports (9) is fixed on the upper and with it connection of aggregate tube (8); The other end of discharge nozzle (11) is communicated with sleeve pipe (5), is provided with sealing element (10) between this sleeve pipe and turning axle (3) and the aggregate tube (8).
2. sodium aluminate solution piston-flow seed crystal decomposing tank according to claim 1, it is characterized in that: feed-pipe (7) level or downward-sloping layout, feed port (9) is distributed in bottom and the termination of this feed-pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010291856 CN101955213B (en) | 2010-09-26 | 2010-09-26 | Sodium aluminate solution piston-flow seed crystal decomposing tank |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010291856 CN101955213B (en) | 2010-09-26 | 2010-09-26 | Sodium aluminate solution piston-flow seed crystal decomposing tank |
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| Publication Number | Publication Date |
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| CN101955213A CN101955213A (en) | 2011-01-26 |
| CN101955213B true CN101955213B (en) | 2013-01-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201010291856 Active CN101955213B (en) | 2010-09-26 | 2010-09-26 | Sodium aluminate solution piston-flow seed crystal decomposing tank |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102583474B (en) * | 2012-01-20 | 2014-08-27 | 贵州省新材料研究开发基地 | Process method for producing aluminum hydroxide by seed decomposition of supersaturated sodium aluminate solution |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3607113A (en) * | 1969-02-24 | 1971-09-21 | Reynolds Metals Co | Continuous precipitation of alumina hydrate |
| CA1117274A (en) * | 1979-01-18 | 1982-02-02 | Allen H. Schlesinger | Dense phase precipitation |
| CN101628726A (en) * | 2009-08-18 | 2010-01-20 | 胡大乔 | Cylindrical flow flat-bottom decomposing tank of sodium aluminate solution |
-
2010
- 2010-09-26 CN CN 201010291856 patent/CN101955213B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3607113A (en) * | 1969-02-24 | 1971-09-21 | Reynolds Metals Co | Continuous precipitation of alumina hydrate |
| CA1117274A (en) * | 1979-01-18 | 1982-02-02 | Allen H. Schlesinger | Dense phase precipitation |
| CN101628726A (en) * | 2009-08-18 | 2010-01-20 | 胡大乔 | Cylindrical flow flat-bottom decomposing tank of sodium aluminate solution |
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| CN101955213A (en) | 2011-01-26 |
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