CN102167374A - Horizontal pushing flow aluminum hydroxide crystallization reactor with convex cone bottom - Google Patents
Horizontal pushing flow aluminum hydroxide crystallization reactor with convex cone bottom Download PDFInfo
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- CN102167374A CN102167374A CN 201110054546 CN201110054546A CN102167374A CN 102167374 A CN102167374 A CN 102167374A CN 201110054546 CN201110054546 CN 201110054546 CN 201110054546 A CN201110054546 A CN 201110054546A CN 102167374 A CN102167374 A CN 102167374A
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- decomposer
- aluminum hydroxide
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Abstract
The invention discloses a horizontal pushing flow aluminum hydroxide crystallization reactor with a convex cone bottom, belongs to chemicrystallization reactors, and aims to provide an aluminum hydroxide seed crystal decomposition groove with low running energy consumption, high product granularity and low manufacturing cost. The reactor comprises a decomposition groove, a feed pipe communicated with the decomposition groove, at least two material carrying pipes which are vertically extended into the decomposition groove, and material carrying air pipes which are intersected and communicated with the material carrying pipes respectively; a conical bulge structure which is protruded upward is formed in the middle of the bottom of the decomposition groove (1); the lower port of each material carrying pipe (3) is extended into the bottom of the decomposition groove (1) and is distributed around the conical bulge; and the upper port of each material carrying pipe (3) is communicated with a material carrying groove (2) which is fixed on the decomposition groove (1). The reactor has the advantages of low manufacturing and installation cost, capacity of saving energy, good production quality and the like, and is an ideal aluminum hydroxide crystallization reaction device.
Description
Technical field: the present invention relates to a kind of chemicrystallization reactor, relate in particular to a kind of sodium aluminate solution and add the reactor that aluminium hydroxide is produced in the decomposition of crystal seed crystallization.
Background technology: at present, in aluminum oxide industry production, adopt refining supersaturated sodium aluminate solution to add the decomposition of crystal seed crystallization mostly and obtain aluminium hydroxide, produce aluminum oxide by dehydration method then.The reactor that sodium aluminate solution adds seeded crystallization production aluminium hydroxide is called " decomposer ".At present, decomposer generally adopts cylindrical flat-bottom structure, this grooved need dispose the mechanical stirring system that is formed by multilayer leaf slurry, transmission shaft, reduction box and motor combination and sodium aluminate solution be stirred roll incessantly, with reach batch mixing and prevent that the aluminum hydroxide crystals particle from piling up at the decomposer bottom settlings, hydrolysis fouling and hinder the purpose that production is normally carried out.Though this strong agitation that liquid is rolled can function as described above, and has following shortcoming:
1, in the sodium aluminate solution flow field, produces very big shear-stress, cause that the aluminum hydroxide particles of crystal growth is broken, wearing and tearing, refinement, the granularity that causes the finished product aluminum oxide between sand shape and powdery, does not reach the granulometry requirement of sandy alumina product mostly.
2, stir the solution that rolls to promoting the dynamic process of lower molecular ratio sodium aluminate solution crystallization reaction, improve rate of decomposition and there is no outstanding contributions; But for the dynamic process of high molecule ratio sodium aluminate solution crystallization reaction, owing to be subjected to diffusion and chemical mixing reaction control, stirring has certain effect to accelerating the diffusion tool of aluminate negatively charged ion in solution.Therefore the sodium aluminate solution in the decomposer is carried out the integral body stirring and roll, not only can cause between the upper and lower layer liquid to mix mutually, make α from top to bottom in the decomposer
kUpset, and the part agitation energy flogs a dead horse to the lower molecular ratio sodium aluminate solution, waste of energy is very big.
3, because existing seed precipitation tank volume big (flat cylindrical machinery stirs the general diameter 8-14 of seed precipitation tank rice, high 20-35 rice), not only seed precipitation tank foundation of civil work and cell body rigidity requirement height, investment are big, and the mechanical stirring system makes and the fixed installation difficulty; And motor power demand also big (every diameter 14 meters, high 35 meters seed precipitation tanks need dispose 75 kilowatts of agitator motors), the continuous operation power consumption is big.
Therefore, flow characteristics according to gas-solid-liquid polyphasic flow, from changing the decomposer space structure, in decomposer, adopt correct alr mode and change and stir the position, according to the needs reasonable disposition agitation energy of sodium aluminate solution crystallization reaction dynamics and process thereof, only make it the reaction kinetics process of high molecule ratio part solution is played a role; And lower molecular ratio part solution to keep nearly plug flow state to decompose be the effective way that realizes saving energy and reduce the cost, improve the xln granularity and reduce the decomposer manufacturing cost.
Summary of the invention: at the above-mentioned defective that exists in the prior art, the present invention aims to provide that a kind of operation energy consumption is little, product granularity good, plug flow crystalline aluminum hydroxide reactor at the bottom of the convex cone of low cost of manufacture.
To achieve these goals, the present invention is by the following technical solutions: it comprise decomposer, the feed-pipe that is communicated with this decomposer, vertical stretch at least two extraction pipes in this decomposer, respectively with each described extraction pipe intersect be communicated with carry the material airduct, tapered protrusion structure for upwards swelling in the middle of the bottom of decomposer, the lower port of each extraction pipe stretch into the bottom of decomposer and be distributed in described tapered protrusion around, the upper port of each extraction pipe is communicated with the hopper of carrying on being fixed on decomposer.
Near along decomposer each extraction pipe lower port tangential direction is provided with the stirring airduct.
Compared with the prior art, the present invention is owing to adopted technique scheme, when sodium aluminate solution flows in the big decomposer of length-to-diameter ratio, solution in each element of volume moves forward with identical speed, on the flow direction of solution, there is not back-mixing, and along decomposer radially on each cross section solution composition in time course, change very little, α
kCan do not upset, decomposition and crystallization is reacted continuous stable state and is carried out; The crystalline aluminum hydroxide particle is distributed to the edge of tapered protrusion during with the tapered protrusion of fluent solution by decomposer bottom equably, is stirred wind subsequently and stirs and kick up, and transfers out by the extraction pipe road again, and the bottom is difficult for producing solid accumulation.This little stirring has simultaneously only been played the effect that promotes the regional area diffusion mass transfer to the sodium aluminate solution of bottom high molecule ratio, does not have influence on the nearly plug flow state of decomposer top lower molecular ratio sodium aluminate solution and the dynamic conditions of crystallization reaction.The present invention has optimized the space structure in the decomposer, makes it to come reasonable distribution agitation energy according to sodium aluminate solution in the difference of decomposer top and bottom molecular ratio, has saved power consumption greatly; Save huge mechanical stirring device simultaneously, greatly reduced the making and the installation cost of decomposer, improved product granularity.
Description of drawings:
Fig. 1 is the structural representation of the embodiment of the invention;
Fig. 2 is the vertical view of Fig. 1;
Fig. 3 is the structural representation of another embodiment of the present invention;
Fig. 4 is the vertical view of Fig. 3.
Among the figure: decomposer 1 is carried hopper 2 extraction pipes 3 stirring airducts 4 and is carried material airduct 5 feed-pipes 6
Embodiment: the invention will be further described below in conjunction with accompanying drawing and specific embodiment:
Embodiment 1
In Fig. 1～2, tapered protrusion structure for upwards swelling in the middle of the bottom of decomposer 1, the lower port of equally distributed four extraction pipes 3 stretch into decomposer 1 bottom and be distributed in described tapered protrusion around, the upper port of each extraction pipe 3 be fixed on decomposer 1 inwall ringwise the hopper 2 of carrying of structure be communicated with.Carrying material airduct 5 for four inserts in the corresponding extraction pipe 3 from top to bottom separately; Be provided with the feed chute 6 that is communicated with decomposer 1 being higher than the position of carrying hopper 2.In order to prevent to produce deposit buildup near the lower port of extraction pipe 3, also to stir in order realizing in the bottom simultaneously, near the tangential direction along decomposer 1 each extraction pipe 3 lower port is provided with stirring airduct 4.
For easy to process, on the identical basis of basic structure and embodiment 1, the present invention can also adopt the structure shown in Fig. 3～4: carry the outer wall that hopper 2 is fixed on decomposer 1, respectively carry material airduct 5 and intersect with corresponding extraction pipe 3 from the side and be communicated with.
Claims (2)
1. plug flow crystalline aluminum hydroxide reactor at the bottom of the convex cone, comprise decomposer, the feed-pipe that is communicated with this decomposer, vertical stretch at least two extraction pipes in this decomposer, respectively with each described extraction pipe intersect be communicated with carry the material airduct, it is characterized in that: tapered protrusion structure for upwards swelling in the middle of the bottom of decomposer (1), the lower port of each extraction pipe (3) stretch into the bottom of decomposer (1) and be distributed in described tapered protrusion around, the upper port of each extraction pipe (3) is communicated with the hopper (2) of carrying on being fixed on decomposer (1).
2. plug flow crystalline aluminum hydroxide reactor at the bottom of the convex cone according to claim 1 is characterized in that: near the tangential direction along decomposer (1) each extraction pipe (3) lower port is provided with stirring airduct (4).
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110054546 CN102167374A (en) | 2011-03-08 | 2011-03-08 | Horizontal pushing flow aluminum hydroxide crystallization reactor with convex cone bottom |
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| CN 201110054546 CN102167374A (en) | 2011-03-08 | 2011-03-08 | Horizontal pushing flow aluminum hydroxide crystallization reactor with convex cone bottom |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107015419A (en) * | 2016-01-27 | 2017-08-04 | 三星电机株式会社 | Camera model |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101319348A (en) * | 2008-06-13 | 2008-12-10 | 青岛大学 | Inverse-conical dropped bottom type crystal growth apparatus |
| CN101955212A (en) * | 2010-09-26 | 2011-01-26 | 苏向东 | Sodium aluminate solution plug-flow decomposition reactor |
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2011
- 2011-03-08 CN CN 201110054546 patent/CN102167374A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101319348A (en) * | 2008-06-13 | 2008-12-10 | 青岛大学 | Inverse-conical dropped bottom type crystal growth apparatus |
| CN101955212A (en) * | 2010-09-26 | 2011-01-26 | 苏向东 | Sodium aluminate solution plug-flow decomposition reactor |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107015419A (en) * | 2016-01-27 | 2017-08-04 | 三星电机株式会社 | Camera model |
| CN107015419B (en) * | 2016-01-27 | 2019-10-18 | 三星电机株式会社 | Camera model |
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Application publication date: 20110831 |