CN111410221B - Be applicable to crystal seed processing apparatus among sodium aluminate production technology - Google Patents
Be applicable to crystal seed processing apparatus among sodium aluminate production technology Download PDFInfo
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- CN111410221B CN111410221B CN202010224970.5A CN202010224970A CN111410221B CN 111410221 B CN111410221 B CN 111410221B CN 202010224970 A CN202010224970 A CN 202010224970A CN 111410221 B CN111410221 B CN 111410221B
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- tank
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- sodium aluminate
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/46—Purification of aluminium oxide, aluminium hydroxide or aluminates
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/04—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
- C01F7/14—Aluminium oxide or hydroxide from alkali metal aluminates
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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- Inorganic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention relates to the technical field of alumina production equipment, and particularly discloses a seed crystal treatment device applicable to a sodium aluminate production process. Adopt technical scheme in this patent to the enterprise, the energy consumption reduces a lot, has reduced the production burden of enterprise, utilizes the filtrating that still keeps the high temperature to wash the seed crystal, has not only realized the recovery of waste heat and has recycled, also makes the water resource can used repeatedly simultaneously.
Description
Technical Field
The invention relates to the technical field of alumina production equipment, in particular to a seed crystal treatment device applicable to a sodium aluminate production process.
Background
The Bayer process becomes the leading process for producing alumina in the world, and comprises a dissolving process and a decomposing process, wherein the dissolving process is to obtain a sodium aluminate solution, the decomposing process is to add aluminum hydroxide serving as seed crystals into the sodium aluminate solution, mix the seed crystals to prepare slurry, the aluminum hydroxide seed crystals generate agglomeration under certain process conditions, and if the content of organic matters in the slurry is high in the process, the precipitation of the aluminum hydroxide is adversely affected, so that the organic matter removal treatment needs to be carried out on the sodium aluminate solution and the aluminum hydroxide seed crystals.
Taking the organic matter removal treatment of the aluminum hydroxide seed crystal as an example, the existing treatment mode is to wash the seed crystal slurry with hot water for many times, but the mode causes great burden to the energy input of enterprises, the energy consumption of the production line is too large, and the large-scale industrial production is not facilitated, so I improves the system to meet the production requirements.
Disclosure of Invention
The invention provides a seed crystal treatment device suitable for a sodium aluminate production process, and aims to solve the problems that in the prior art, the energy consumption for seed crystal treatment is too high, and great burden is caused to enterprises.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the utility model provides a be applicable to crystal seed processing apparatus among sodium aluminate production technology, includes belt vacuum filter, hot-water tank, washing liquid groove, filter cake groove, a scavenge pipe and secondary scavenge pipe, and belt vacuum filter includes feed end, washing district and discharge end, and the hot-water tank is through wash pipe and washing district intercommunication in proper order, and washing district and washing liquid groove intercommunication, washing liquid groove pass through secondary scavenge pipe and washing district intercommunication, discharge end and filter cake groove intercommunication.
The technical principle and the effect of the technical scheme are as follows:
in this scheme seed crystal thick liquids from the feed liquor end pump income belt vacuum filter, hot water is gone into the washing district through a scavenge pipe pump, washs the seed crystal thick liquids, and organic matter sodium oxalate in the seed crystal thick liquids is dissolved in hot water to being filtered and obtaining filtrating, entering into the filtrating inslot, because the filtrating that gets into in the filtrating inslot still keeps high temperature, consequently with the filtrating of filtrating inslot again through secondary scavenge pipe pump go into the washing district in, wash the seed crystal thick liquids that remove to in the washing district.
Like this to the enterprise, the energy consumption reduces a lot, has reduced the production burden of enterprise, utilizes the filtrating of still keeping high temperature to wash the seed crystal, has not only realized the recovery of waste heat and has recycled, also makes the water resource can used repeatedly simultaneously.
In addition, when the belt type vacuum filter works, due to the action of negative pressure, water flow for washing the seed crystal slurry can quickly enter the filtrate tank, namely the content of organic matters in the filtrate tank is far less than the saturated content, so that the filtrate is returned to the washing area again without influencing the dissolution of hot water on the organic matters.
Furthermore, a filtrate tank is arranged below the belt type vacuum filter, the filtrate tank is communicated with the lower part of the liquid inlet end, and the filtrate tank is communicated with a stock solution tank filled with seed crystal slurry through a pipeline.
Has the beneficial effects that: because the seed crystal slurry also contains partial alkali liquor, the filtrate is connected into the filtrate tank before cleaning, and the primary filtrate enters the raw liquor tank again to generate the seed crystal.
Furthermore, a washing tank is arranged below the belt type vacuum filter, the washing tank is connected with a washing pipe, and filter cloth in the belt type vacuum filter penetrates through the washing tank.
Has the advantages that: because probably still remain aluminium hydroxide crystal seed on the filter cloth, in order to prevent the spill waste of crystal seed, set up the wash tank, wash off the crystal seed on the filter cloth, also guarantee the filter effect of filter cloth simultaneously.
Further, a fine solution tank is connected to the filter cake tank, and a sodium aluminate solution is filled in the fine solution tank.
Has the advantages that: thus, the mixing of the seed crystal and the sodium aluminate can be completed in real time.
Further, a stirring mechanism is arranged in the filter cake tank, so that the solid content of slurry in the filter cake tank is 400-600 g/l.
Has the advantages that: the stirring mechanism mixes the cleaned aluminum hydroxide seed crystal and the sodium aluminate solution to form slurry with solid content of 400-600 g/l.
Further, the bottom of the filter cake tank is connected with a discharge pipe, the discharge pipe is connected with a first decomposition tank, and the first decomposition tank is connected with a second decomposition tank through a pipeline.
Has the advantages that: wherein the first decomposer is used for agglomeration of the seed crystal, and the second decomposer is used for growth of aluminum hydroxide crystal grains.
Furthermore, the discharging pipe is also connected with an alkali boiling system, and the alkali boiling system can introduce alkali liquor with the temperature of more than 100 ℃ into the discharging pipe.
Has the advantages that: after a period of production, scabs containing aluminum hydroxide and silicon dioxide are easily generated on the inner wall of the discharge pipe, so that the inner diameter of the discharge pipe is reduced, and therefore alkali liquor with the temperature of more than 100 ℃ needs to be introduced into the discharge pipe through an alkali boiling system, and the scabs on the inner wall of the discharge pipe fall off.
Further, the lotion groove passes through pipeline intercommunication raw material proportioning bins.
Has the advantages that: in order to prevent the secondary filtrate in the washing liquid tank from overflowing, in the seed crystal slurry cleaning process, the secondary filtrate in the washing liquid tank is pumped into a raw material proportioning tank, and the reconfigured secondary filtrate enters a sintering process to remove organic matters in the secondary filtrate.
Further, the temperature of the hot water in the hot water tank is 90-100 ℃.
Has the advantages that: at the temperature, the solubility of organic matters in the seed crystal slurry, such as sodium oxalate, is highest, so that the organic matters in the seed crystal slurry can be dissolved and filtered to the greatest extent.
Further, the secondary cleaning pipe is located between the feeding end and the primary cleaning pipe.
Has the beneficial effects that: set up the heat of not only fine utilization a lotion like this, increaseed the solubility of organic matter in the seed crystal thick liquids, failed complete abluent organic matter in the seed crystal thick liquids simultaneously and washed once more through a scavenge pipe, reduced the organic matter content in the seed crystal thick liquids.
Drawings
FIG. 1 is a process flow diagram of example 1 of the present invention;
FIG. 2 is a schematic structural view of a stirring mechanism in embodiment 2 of the present invention;
FIG. 3 isbase:Sub>A sectional view taken along line A-A of FIG. 2;
fig. 4 is a cross-sectional view of the first baffle and the second baffle in embodiment 2 of the present invention.
Detailed Description
The following is further detailed by way of specific embodiments:
reference numerals in the drawings of the specification include: the device comprises a belt type vacuum filter 1, a hot water tank 2, a filtrate tank 3, a washing liquid tank 4, a filter cake tank 5, a stock solution tank 6, a raw material batching tank 7, a primary washing pipe 8, a secondary washing pipe 9, a washing water tank 10, a washing pipe 11, a refined liquid tank 12, a first decomposition tank 13, a second decomposition tank 14, an alkali cooking system 15, a motor 100, a stirring shaft 101, a stirring blade 102, a sliding block 103, a through hole 104, a first baffle 105, a first accommodating cavity 106, a first tension spring 107, a second baffle 108, a second accommodating cavity 109, a second tension spring 110 and a metal wire 111.
Example 1 is substantially as shown in figure 1:
the utility model provides a be applicable to crystal seed processing apparatus among sodium aluminate production technology, includes belt vacuum filter 1, hot-water tank 2, filtrate groove 3, lotion groove 4 and filter cake groove 5, belt vacuum filter 1 includes the feed end in proper order after from a left side, washs district and discharge end, wherein belt vacuum filter 1's feed end below through pipeline and filtrate groove 3 intercommunication, belt vacuum filter 1's washing district and lotion groove 4 pass through the pipeline intercommunication, belt vacuum filter 1's discharge end and filter cake groove 5 intercommunication.
The primary filtrate in the filtrate tank 3 returns to the primary liquid tank 6 through a pipeline, the primary liquid tank 6 is used for charging seed slurry, the secondary filtrate in the washing liquid tank 4 is also communicated with a raw material proportioning tank 7 through a pipeline, wherein the raw material proportioning tank 7 is used for reconfiguring the secondary filtrate, and then the secondary filtrate enters a sintering process to remove organic matters in the secondary filtrate.
A primary cleaning pipe 8 and a secondary cleaning pipe 9 are arranged above the belt type vacuum filter 1, the secondary cleaning pipe 9 is positioned on the left side of the primary cleaning pipe 8, the primary cleaning pipe 8 is communicated with the hot water tank 2, the water temperature in the hot water tank 2 is kept at 90-100 ℃, the secondary cleaning pipe 9 is communicated with the cleaning solution tank 4, and secondary filter solution entering the cleaning solution tank 4 is pumped into a cleaning area of the belt type vacuum filter 1 through the secondary cleaning pipe 9 again through a pump body.
The device comprises a belt-type vacuum filter 1, a washing water tank 10 is arranged below the belt-type vacuum filter 1, the washing water tank 10 is connected with a washing pipe 11, the washing water tank 10 is used for washing filter cloth and other equipment in the filter, the upper part of a filter cake tank 5 is communicated with a semen tank 12 through a pipeline, a sodium aluminate solution is filled in the semen tank 12, a stirring mechanism is arranged in the filter cake tank 5, so that the solid content in the filter cake tank 5 is 400-600g/l, the bottom of the filter cake tank 5 is sequentially communicated with a first decomposition tank 13 and a second decomposition tank 14 through a discharge pipe, wherein the first decomposition tank 13 is used for agglomeration of crystal seeds, the second decomposition tank 14 is used for growth of aluminum hydroxide crystal grains, and the first decomposition tank 13 and the second decomposition tank 14 have different process conditions and are specifically set according to production requirements.
An alkali boiling system 15 is arranged on the discharge pipe, after production is carried out for a period of time, scabs containing aluminum hydroxide and silicon dioxide are easily generated on the inner wall of the discharge pipe, so that the inner diameter of the discharge pipe is reduced, and therefore, the scabs on the inner wall of the discharge pipe are separated by introducing alkali liquor with the temperature of more than 100 ℃ into the discharge pipe to the alkali boiling system 15.
The model of the vacuum belt filter in the embodiment is DU60-3200 rubber belt vacuum filter 1 manufactured by Huzhou nuclear mechanical Limited, and the operating principle of the filter is consistent with that of the common belt vacuum filter 1.
When the seed crystal is cleaned, the seed crystal slurry in the stock solution tank 6 is pumped from the liquid inlet end, the primary filtrate which is firstly filtered out enters the filtrate tank 3 and then is pumped back to the stock solution tank 6, the seed crystal slurry continues to move from the discharge end on the filter cloth of the filter, hot water is pumped into the cleaning area through the primary cleaning pipe 8 to clean the seed crystal slurry, the organic sodium oxalate in the seed crystal slurry is dissolved in the water and is filtered to obtain secondary filtrate, the secondary filtrate enters the filtrate tank 3, and the secondary filtrate entering the filtrate tank 3 still keeps high temperature, so that the secondary filtrate in the filtrate tank 3 is pumped into the cleaning area through the secondary cleaning pipe 9 again, and the seed crystal slurry moving into the cleaning area is cleaned.
In order to prevent the secondary filtrate in the filtrate tank 3 from overflowing, the secondary filtrate is pumped into a raw material proportioning tank 7 in the cleaning process, the reconfigured secondary filtrate enters a sintering process, organic matters in the secondary filtrate are removed, the crystal seeds which finish cleaning and filtering enter a filter cake tank 5, meanwhile, sodium aluminate solution is pumped into the filter cake tank 5, the mixture is stirred by a stirring mechanism in the filter cake tank 5, slurry with solid content of 400-600g/l is obtained, the slurry is pumped into a first decomposition tank 13 through a discharge pipe, the crystal seeds enter a second decomposition tank 14 after agglomeration is finished, and the growth of aluminum hydroxide crystal grains is finished.
Example 2 is substantially as shown in figure 2:
the difference from example 1 is that: the stirring mechanism comprises a motor 100, a stirring shaft 101 and stirring blades 102, wherein the motor 100 is fixed on the frame, an output shaft of the motor 100 is vertically arranged downwards, the stirring shaft 101 is rotatably connected in the filter cake tank 5, the stirring shaft 101 is fixedly connected on the output shaft of the motor 100 through a coupler, a reciprocating spiral section is arranged on the outer wall of the stirring shaft 101, the reciprocating spiral section is consistent with the spiral of a reciprocating screw rod, namely two spirals with opposite rotation directions are arranged on the outer wall of the stirring shaft 101, a sliding block 103 is further arranged on the reciprocating spiral section, the stirring blades 102 are provided with a plurality of stirring blades 102 and fixed on the sliding block 103, the stirring blades 102 are uniformly distributed along the circumferential direction of the sliding block 103, the far ends of the stirring blades 102 are slidably connected on the frame positioned in the filter cake tank 5, namely, the stirring shaft 101 rotates, and the stirring blades 102 and the sliding block 103 perform vertical linear motion on the reciprocating spiral section.
Referring to fig. 3, the stirring blade 102 is horizontally disposed, a plurality of through holes 104 are formed in the stirring blade 102, a vibration structure is disposed in each through hole 104, wherein the vibration structure includes a first blocking plate 105 and a second blocking plate 108, the first blocking plate 105 and the second blocking plate 108 are hinged to the inner wall of the through hole 104 through a 180 ° hinge, the side edges of the first blocking plate 105 and the second blocking plate 108, which are close to each other, are zigzag, referring to fig. 4, a first accommodating cavity 106 is formed in the first blocking plate 105, a second accommodating cavity 109 is formed in the second blocking plate 108, a plurality of first tension springs 107 are fixed in the first accommodating cavity 106, the elastic coefficients of adjacent first tension springs 107 are different, a plurality of second tension springs 110 are fixed in the second accommodating cavity 109, the elastic coefficients of adjacent second tension springs 110 are different, a metal wire 111 is fixed between the first tension springs 107 and the second tension springs 110, a gap between adjacent metal wires 111 is less than 1mm, and when the first blocking plate 105 and the second blocking plate 108 are not subjected to an external force, the first blocking plate 105 and the second blocking plate 108 are in a horizontal state, and are engaged with each other.
When the stirring mechanism works, the stirring shaft 101 is driven to rotate by the motor 100, the sliding block 103 and the stirring blade 102 reciprocate up and down on the stirring shaft 101, so that filtered aluminum hydroxide crystal seeds and sodium aluminate solution are mixed to prepare slurry, when the stirring blade 102 moves upwards, the slurry in the filter cake tank 5 flows downwards through the through hole 104, when the slurry passes through the through hole 104, the first baffle 105 and the second baffle 108 are acted by downward force, the first baffle 105 and the second baffle 108 rotate downwards to be opened, the metal wire 111 is exposed, the crystal seeds of large particles in the slurry are broken under the cutting action of the metal wire 111, and further the particle size of the crystal seeds is reduced.
When the stirring blade 102 moves downward, the seed crystals of large particles in the slurry are cut by the wire 111 and the particle size is reduced while passing through the passage hole 104. And the smaller the particle size of the seed crystal, the faster the seed crystal is agglomerated in the first decomposition tank 13, shortening the process flow.
The foregoing is merely an example of the present invention and common general knowledge of known specific structures and features of the embodiments is not described herein in any greater detail. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several variations and modifications can be made, which should also be considered as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the utility of the patent. The scope of the claims of the present application shall be defined by the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (9)
1. The utility model provides a be applicable to crystal seed processing apparatus in sodium aluminate production technology which characterized in that: the belt type vacuum filter comprises a feed end, a cleaning area and a discharge end, the hot water tank is communicated with the cleaning area through the primary cleaning pipe, the cleaning area is communicated with the washing liquid tank, the washing liquid tank is communicated with the cleaning area through the secondary cleaning pipe, and the discharge end is communicated with the filter cake tank;
a stirring mechanism is arranged in the filter cake tank, so that the solid content of slurry in the filter cake tank is 400-600 g/l;
a frame is arranged on the filter cake tank, the stirring mechanism comprises a motor, a stirring shaft and stirring blades, wherein the motor is fixed on the frame, an output shaft of the motor is vertically arranged downwards, the stirring shaft is rotationally connected in the filter cake tank, the stirring shaft is fixedly connected on the output shaft of the motor through a coupler, a reciprocating spiral section is arranged on the outer wall of the stirring shaft, and the arrangement of the reciprocating spiral section is consistent with the spiral of the reciprocating lead screw; the reciprocating spiral section is also provided with a slide block, a plurality of stirring blades are arranged and fixed on the slide block, the stirring blades are uniformly distributed along the circumferential direction of the slide block, and the far ends of the stirring blades are connected on a rack positioned in the filter cake groove in a sliding manner;
the stirring blade is horizontally arranged, a plurality of through holes are formed in the stirring blade, a vibration structure is arranged in each through hole, the vibration structure comprises a first baffle and a second baffle, the first baffle and the second baffle are hinged to the inner wall of each through hole through a 180-degree hinge, and the side edges of the first baffle and the second baffle, which are close to each other, are in a sawtooth shape; set up the first chamber that holds in first baffle, it holds the chamber to have seted up the second in the second baffle, the first intracavity that holds is fixed with many first extension springs, the elastic coefficient between the adjacent first extension spring is different, the second holds the intracavity and is fixed with many second extension springs, the elastic coefficient between the adjacent second extension spring is different, be fixed with the wire between first extension spring and the second extension spring, clearance between the adjacent wire is less than 1mm, when first baffle and second baffle do not receive external force, first baffle is the horizontality with the second baffle, and intermeshing.
2. The seed crystal processing device applicable to the sodium aluminate production process according to claim 1, characterized in that: and a filtrate tank is arranged below the belt type vacuum filter, is communicated with the lower part of the liquid inlet end, and is communicated with a stock solution tank filled with seed crystal slurry through a pipeline.
3. The seed crystal processing device applicable to the sodium aluminate production process according to claim 1, characterized in that: a washing tank is arranged below the belt type vacuum filter, the washing tank is connected with a washing pipe, and filter cloth in the belt type vacuum filter penetrates through the washing tank.
4. The seed crystal processing device applicable to the sodium aluminate production process according to claim 1, characterized in that: and the filter cake tank is connected with a fine solution tank, and a sodium aluminate solution is filled in the fine solution tank.
5. The seed crystal processing device applicable to the sodium aluminate production process according to claim 4, characterized in that: the filter cake tank bottom is connected with the discharging pipe, the discharging pipe is connected with a first decomposer, and the first decomposer is connected with a second decomposer through a pipeline.
6. The seed crystal processing device applicable to the sodium aluminate production process according to claim 5, characterized in that: the discharging pipe is further connected with an alkali boiling system, and the alkali boiling system can introduce alkali liquor with the temperature of more than 100 ℃ into the discharging pipe.
7. The device for seed crystal treatment in sodium aluminate production process according to claim 1, characterized in that: the washing liquid groove is communicated with the raw material batching tank through a pipeline.
8. The seed crystal processing device applicable to the sodium aluminate production process according to claim 1, characterized in that: the temperature of the hot water in the hot water tank is 90-100 ℃.
9. The seed crystal processing device applicable to the sodium aluminate production process according to claim 1, characterized in that: the secondary cleaning pipe is positioned between the feeding end and the primary cleaning pipe.
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