CN115608002A - Device and method for enhancing extraction of phosphate ore acidolysis slurry - Google Patents
Device and method for enhancing extraction of phosphate ore acidolysis slurry Download PDFInfo
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- CN115608002A CN115608002A CN202211616486.2A CN202211616486A CN115608002A CN 115608002 A CN115608002 A CN 115608002A CN 202211616486 A CN202211616486 A CN 202211616486A CN 115608002 A CN115608002 A CN 115608002A
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Abstract
The invention relates to a device and a method for strengthening extraction of acidolysis slurry of phosphorite, wherein the device comprises a tower body, and the tower body comprises a first layered section, a first connecting section, a fluidized mixing section, a second connecting section, an extraction section, a third connecting section and a second layered section which are sequentially arranged along the direction pointing to the bottom of the tower body; the diameter D = D x phi of the fluidized mixing section 0.5 X (0.75-1.25); wherein d is the diameter of the extraction section, and phi is the aperture ratio of an extraction plate in the extraction section. The fluidized mixing section is arranged in the tower body, and the micro-bubbles are introduced into the extracting agent to form multi-phase flow, so that the enhanced dispersion and mixing of the phosphate acidolysis slurry and the extracting agent in the fluidized mixing section are facilitated, and the efficient extraction of the phosphate acidolysis slurry is realized.
Description
Technical Field
The invention relates to the technical field of extraction, in particular to a device and a method for enhancing extraction of acid hydrolysis slurry of phosphorite.
Background
Collophanite contains a large amount of impurities such as aluminum, iron, magnesium and the like, and is dissolved and released into phosphoric acid in the wet-process phosphoric acid process, so that the content of the impurities in the phosphoric acid is easily overhigh. The phosphorus ore acidolysis slurry is extracted to realize effective removal of impurities in the phosphoric acid, but the phosphogypsum contains a large amount of colloidal carbon and silicon, so that the viscosity of the phosphorus ore acidolysis slurry is also remarkably increased, the slurry is difficult to effectively disperse, the slurry is easy to condense under the action of surface tension, the mixing effect with an extracting agent is reduced, and finally, the impurity extraction efficiency is remarkably reduced.
CN 1029517A discloses a tower type wet-process phosphoric acid production method and equipment, wherein the chemical reaction is carried out in a mixing tank and an extraction tower or an extraction tower with a premixer, reaction slurry meets and is mixed with dihydrate seed crystals from the tower bottom in the tower to carry out hydration reaction, and compressed air entering from the tower bottom is used for stirring the slurry and exchanging heat for mass transfer through a conical distributor and a grid distributor. However, the invention adopts three steps of reaction, the process flow is more complex, and the extraction process adopts a mixing tank and a single-stage extraction tower, the conversion and the extraction are completed in the same tower, and residues are easily mixed into the phosphogypsum.
CN 1317183A discloses a method for producing wet-process phosphoric acid by using medium and low grade phosphorite, which comprises the following steps: the first stage of reaction is that excessive phosphoric acid is used for decomposing phosphorite in a countercurrent way in a multistage extraction tank to generate calcium dihydrogen phosphate solution, and the residue is removed by liquid-solid separation to obtain extraction clear liquid; the second stage reaction is to react the extracted clear liquid with sulfuric acid in a reaction tank to generate calcium sulfate dihydrate crystal and phosphoric acid solution, and filter-grade phosphoric acid and phosphogypsum are obtained through liquid-solid separation; most of the filter-grade phosphoric acid is returned to be used for decomposing phosphorite, and a small part of the filter-grade phosphoric acid is output as a finished product. The method has high requirement on the impurity content of the phosphorite, and is complex in process flow, high in cost and not suitable for large-scale production.
CN 106185852A discloses a method for preparing purified phosphoric acid from phosphorite, which comprises the following steps: 1) Carrying out phosphorite reaction; 2) Filtering; 3) Extracting and separating; 4) Washing; 5) Back extraction and separation; 6) And (4) neutralizing. According to the method for directly extracting the metal cations from the wet-process phosphoric acid to purify the wet-process phosphoric acid, only the cations in the dilute acid enter the organic phase in the extraction process, so that the phosphoric acid loss rate is greatly reduced, and tail acid with low additional value does not exist. However, the traditional stirring device is still used for extraction in the extraction process, so that slurry and an extracting agent are difficult to effectively mix, the extraction efficiency is low, and the production requirement is difficult to meet.
Aiming at the defects of the prior art, a device and a method for efficiently extracting impurities in phosphate ore acidolysis slurry are needed.
Disclosure of Invention
The invention aims to provide a device and a method for strengthening extraction of phosphate ore acidolysis slurry.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a device for enhancing extraction of acid hydrolysis slurry of phosphate ore, which comprises a tower body, wherein the tower body comprises a first layered section, a first connecting section, a fluidized mixing section, a second connecting section, an extraction section, a third connecting section and a second layered section which are sequentially arranged along the direction pointing to the bottom of the tower body;
the diameter D = D x phi of the fluidized mixing section 0.5 X (0.75-1.25); wherein d is the diameter of the extraction section, and phi is the aperture ratio of an extraction plate in the extraction section.
According to the device provided by the invention, the fluidized mixing section is arranged in the tower body, and the diameter of the fluidized mixing section is limited, so that the extraction process of the phosphate ore acidolysis slurry can be realized, the extractant flowing upwards in the countercurrent and the phosphate ore acidolysis slurry flowing downwards in the downstream can be subjected to boiling mixing, the phosphate ore acidolysis slurry and the extractant in the fluidized mixing section are in violent turbulence, the slurry liquid drops are broken into fine liquid drops, the contact area between the extractant and the liquid drops is increased, the mass transfer rate is accelerated, the extraction rate is greatly improved, and the mixing and extraction of the phosphate ore acidolysis slurry and the extractant are strengthened.
The diameter D = D x phi of the fluidized mixing section 0.5 X (0.75-1.25) may be, for example, d.times.phi 0.5 ×0.75、d×Φ 0.5 X 1 or dXφ 0.5 X 1.25, but is not limited to the values recited, and other values within the range are equally applicable.
The diameter of the fluidization mixing section is related to the equivalent diameter of the effective sectional area of the extraction section with the perforated extraction plate, and a certain coefficient is taken, so that the diameter of the fluidization mixing section is obtained.
Preferably, the diameter d of the extraction section is from 50 to 5000mm, for example 50mm, 500mm, 1000mm, 3000mm or 5000mm, but is not limited to the values listed, and other values not listed in the numerical ranges are equally suitable.
Preferably, the extraction plates in the extraction section have an open porosity Φ of 15-30%, for example 15%, 20%, 25% or 30%, but not limited to the values recited, and other values not recited in the range of values are equally applicable.
Preferably, the extraction plate comprises a sieve plate and/or a plate ring.
Preferably, the first separation layer, the fluidization mixing section, the extraction section and the second separation layer are hollow cylinders respectively.
Preferably, the first connecting section, the second connecting section and the third connecting section are hollow round table bodies respectively.
The first connecting section is used for connecting the first layered section and the fluidization mixing section, the second connecting section is used for connecting the fluidization mixing section and the extraction section, and the third connecting section is used for connecting the extraction section and the second layered section.
Preferably, a slurry inlet and an extraction liquid outlet are arranged at the top of the first delamination section.
Preferably, the bottom of the second separation layer is provided with an extractant inlet and a purified slurry outlet.
Preferably, the fluidization mixing section has a height to diameter ratio of (10-20): 1, which can be, for example, 10.
The ratio of the height to the diameter of the fluidized mixing section is too low, and the extraction agent and the acidolysis slurry liquid drops do not have sufficient time to be dispersed and fully mixed; the ratio of height to diameter is too high, the acidolysis slurry droplets reunite and grow up again, which is not beneficial for extraction, and the load of the extraction tower is lower.
Preferably, the ratio of the diameters of the first separation stage to the extraction stage is (1.3-1.7): 1, for example 1.3.
Preferably, the ratio of the diameter of the second separation section to the diameter of the extraction section is (1.5-2.5): 1, for example 1.5.
In a second aspect, the invention provides a method for enhancing extraction of acid hydrolysis slurry of phosphate ore by using the device in the first aspect, and the method comprises the following steps:
mixing and extracting the phosphorite acidolysis slurry and the microbubble extractant flowing upwards in a countercurrent manner, performing first separation treatment to obtain an extract and the phosphorite acidolysis slurry, and performing second separation treatment to obtain the extractant and the purification slurry.
According to the method for enhancing the extraction of the phosphate ore acidolysis slurry, provided by the invention, the microbubble is introduced into the extractant to form multiphase flow, so that the enhanced dispersion and mixing of the phosphate ore acidolysis slurry and the extractant in the fluidized mixing section are facilitated, the extraction process is further promoted, and the impurity extraction effect is obviously improved; after the phosphorite acidolysis slurry and the microbubble extractant are mixed and extracted, the first separation treatment is carried out in the first layered section, the second separation treatment is carried out in the second layered section, the process flow is simple, and the extraction rate is high.
Preferably, the volume of the microbubbles in the microbubble extracting agent is 5-10% of the total volume of the microbubble extracting agent, for example, 5%, 6%, 8%, 9%, or 10%, but is not limited to the recited values, and other values not recited within the range of values are equally applicable.
The volume of the microbubbles in the microbubble extractant is too low, the strengthening effect on the dispersion and mixing of the phosphorite acidolysis slurry and the extractant is obviously reduced, the volume is too high, the extractant dosage in the extraction tower can be reduced, the contact time of the extractant and the phosphorite acidolysis slurry is reduced, and the extraction efficiency is reduced.
Preferably, the diameter of the microbubbles is 5 to 500 μm, for example 5 μm, 50 μm, 200 μm, 300 μm or 500 μm, but is not limited to the recited values, and other values not recited in the range of values are equally applicable.
Preferably, the extracting agent in the microbubble extractant includes any one or a combination of at least two of a phospholipid extractant, an alcohol extractant, or a ketone extractant, and typical but non-limiting combinations include a combination of a phospholipid extractant and an alcohol extractant, a combination of an alcohol extractant and a ketone extractant, or a combination of a phospholipid extractant, an alcohol extractant, and a ketone extractant.
Preferably, the flow ratio of the microbubble extractant to the phosphorite acidolysis slurry is (0.5-50): 1, for example, 0.5.
Preferably, the temperature of the mixed extraction is 50-80 ℃, for example, 50 ℃, 60 ℃, 70 ℃, 75 ℃ or 80 ℃, but not limited to the recited values, and other values not recited in the numerical range are equally applicable.
Preferably, the extraction liquid is discharged through an extraction liquid outlet.
Preferably, the purified slurry is discharged through a purified slurry outlet.
As a preferable embodiment of the method according to the second aspect of the present invention, the method includes the steps of:
mixing and extracting phosphorite acidolysis slurry with a flow ratio of (0.5-50): 1 and a microbubble extractant flowing upwards in a countercurrent manner at 50-80 ℃, performing first separation treatment to obtain an extract and phosphorite acidolysis slurry, discharging the extract through an extract outlet, performing second separation treatment to obtain the extractant and purified slurry, and discharging the purified slurry through a purified slurry outlet; the volume of microbubbles in the microbubble extracting agent is 5-10% of the total volume of the microbubble extracting agent; the diameter of the microbubbles is 5 to 500 μm.
Compared with the prior art, the invention has the following beneficial effects:
according to the device provided by the invention, the fluidized mixing section is arranged in the tower body, and the diameter of the fluidized mixing section is limited, so that the extractant flowing upwards in a countercurrent manner and the phosphorite acidolysis slurry flowing downwards in a concurrent manner can be subjected to boiling mixing in the process of extracting the phosphorite acidolysis slurry; the microbubble is introduced into the extracting agent to form multiphase flow, which is favorable for the reinforced dispersion and mixing of the phosphate ore acidolysis slurry and the extracting agent in the fluidized mixing section, the extraction rate can reach 96.8 percent, and the high-efficiency extraction of the phosphate ore acidolysis slurry is realized.
Drawings
FIG. 1 is a schematic diagram of the structure of an apparatus for enhancing extraction of acid hydrolysis slurry of phosphate ore provided in example 1 of the present invention;
wherein: 1, a first delamination section; 2, a first connecting section; 3, a fluidization mixing section; 4, a second connecting section; 5, an extraction section; 6, a third connecting section; 7, a second stratification section.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Example 1
The embodiment provides a device for enhancing extraction of acid hydrolysis slurry of phosphate rock, as shown in fig. 1, the device includes a tower body, and the tower body includes, along a direction pointing to the bottom of the tower body, a first separation section 1, a first connection section 2, a fluidized mixing section 3, a second connection section 4, an extraction section 5, a third connection section 6, and a second separation section 7 which are sequentially arranged;
the first separation layer section 1, the fluidization mixing section 3, the extraction section 5 and the second separation layer section 7 are respectively hollow cylinders, and the first connection section 2, the second connection section 4 and the third connection section 6 are respectively hollow round table bodies; the top of the first layered section 1 is provided with a slurry inlet and an extract liquid outlet; the bottom of the second layered section 7 is provided with an extractant inlet and a purified slurry outlet;
the diameter D = D x phi of the fluidized mixing section 3 0.5 X 1; wherein d is the diameter of the extraction section 5, and phi is the aperture ratio of a sieve plate in the extraction section 5; the diameter d of the extraction section 5 is 1000mm; the aperture ratio phi of a sieve plate in the extraction section 5 is 20 percent; the height to diameter ratio of the fluidization mixing section 3 is 15; the ratio of the diameters of the first separation section 1 to the extraction section 5 is 1.5; the ratio of the diameter of the second separation section 7 to the diameter of the extraction section 5 is 2.
Example 2
The embodiment provides a device for strengthening extraction of acidolysis slurry of phosphate ore, which comprises a tower body, wherein the tower body comprises a first layered section 1, a first connecting section 2, a fluidized mixing section 3, a second connecting section 4, an extraction section 5, a third connecting section 6 and a second layered section 7 which are sequentially arranged along the direction pointing to the bottom of the tower body;
the first separation layer section 1, the fluidization mixing section 3, the extraction section 5 and the second separation layer section 7 are respectively hollow cylinders, and the first connection section 2, the second connection section 4 and the third connection section 6 are respectively hollow round table bodies; the top of the first layered section 1 is provided with a slurry inlet and an extract liquid outlet; the bottom of the second layered section 7 is provided with an extractant inlet and a purified slurry outlet;
the diameter D = D x phi of the fluidized mixing section 3 0.5 X 1.25; wherein d is the diameter of the extraction section 5, and phi is the aperture ratio of a sieve plate in the extraction section 5; the diameter d of the extraction section 5 is 50mm; the aperture ratio phi of the sieve plate in the extraction section 5 is 15 percent; the ratio of the height to the diameter of the fluidization mixing section 3 is 10; the ratio of the diameters of the first layered section 1 to the extraction section 5 is 1.3; the ratio of the diameters of the second separation section 7 to the extraction section 5 is 1.5.
Example 3
The embodiment provides a device for strengthening extraction of acidolysis slurry of phosphate ore, which comprises a tower body, wherein the tower body comprises a first layered section 1, a first connecting section 2, a fluidized mixing section 3, a second connecting section 4, an extraction section 5, a third connecting section 6 and a second layered section 7 which are sequentially arranged along the direction pointing to the bottom of the tower body;
the first layered section 1, the fluidized mixing section 3, the extraction section 5 and the second layered section 7 are respectively hollow cylinders, and the first connecting section 2, the second connecting section 4 and the third connecting section 6 are respectively hollow round table bodies; the top of the first layered section 1 is provided with a slurry inlet and an extract liquid outlet; the bottom of the second layered section 7 is provided with an extractant inlet and a purified slurry outlet;
the diameter D = D x phi of the fluidization mixing section 3 0.5 X is 0.75; wherein d is the diameter of the extraction section 5, and phi is the aperture ratio of a sieve plate in the extraction section 5; the diameter d of the extraction section 5 is 5000mm; the aperture ratio phi of the sieve plate in the extraction section 5 is 30 percent; the ratio of the height to the diameter of the fluidization mixing section 3 is 20; the diameter ratio of the first separation section 1 to the extraction section 5 is 1.7; the ratio of the diameter of the second separation section 7 to the diameter of the extraction section 5 is 2.5.
Example 4
This example provides an apparatus for enhancing extraction of acid hydrolyzed slurry of phosphorus ore, which is different from example 1 in that the apparatus is the same as example 1 except that the height to diameter ratio of the fluidized mixing section 3 is adjusted to 5.
Example 5
This example provides an apparatus for enhancing extraction of acidolysis slurry of phosphate ore, which is different from example 1 in that the apparatus is the same as example 1 except that the height-to-diameter ratio of the fluidized mixing section 3 is adjusted to be 25.
Comparative example 1
The comparative example provides a device for enhancing the extraction of acidolysis slurry of phosphorite, which is different from the embodiment 1 in that the diameter D = D x phi of the fluidization mixing section 3 0.5 0.5, the diameter d of the extraction section 5 is 1000mm, the opening ratio phi of a sieve plate in the extraction section 5 is 20 percent, and the rest is the same as that of the embodiment 1.
Comparative example 2
The comparative example provides a device for reinforcing extraction of acid hydrolysis slurry of phosphorite, which is different from the device in the example 1 in that the diameter D = D x phi of the fluidized mixing section 3 0.5 X 1.5, the diameter d of the extraction section 5 is 1000mm, the aperture ratio phi of a sieve plate in the extraction section 5 is 20 percent, and the rest is the same as that of the embodiment 1The same as above.
Comparative example 3
The comparative example provides a device for extracting phosphate rock acidolysis slurry, and the difference from the embodiment 1 is that the tower body is not provided with a fluidized mixing section 3, the adaptability and the like are replaced by an extraction section, and the rest is the same as the embodiment 1.
Application example 1
The application example provides a method for applying the device for reinforcing extraction of acid hydrolysis slurry of phosphorite provided by the embodiment 1, and the method comprises the following steps:
mixing and extracting phosphorite acidolysis slurry with a flow ratio of 40; the volume of microbubbles in the microbubble extracting agent is 8% of the total volume of the microbubble extracting agent; the diameter of the micro-bubbles is 5-300 mu m; the extracting agent in the microbubble extracting agent is ethylene glycol.
Application example 2
The application example provides a method for applying the device for reinforcing extraction of acid hydrolysis slurry of phosphorite provided by the embodiment 1, and the method comprises the following steps:
mixing and extracting phosphorite acidolysis slurry with a flow ratio of 50; the volume of microbubbles in the microbubble extracting agent is 5% of the total volume of the microbubble extracting agent; the diameter of the micro-bubbles is 5-50 μm; the extracting agent in the microbubble extracting agent is glycol.
Application example 3
The application example provides a method for applying the device for enhancing the extraction of the acid hydrolysis slurry of phosphorite provided by the embodiment 1, and the method comprises the following steps:
mixing and extracting the phosphorite acidolysis slurry with the flow ratio of 0.5; the volume of microbubbles in the microbubble extracting agent is 10% of the total volume of the microbubble extracting agent; the diameter of the micro-bubbles is 100-500 μm; the extracting agent in the microbubble extracting agent is glycol.
Application example 4
The present application example provides a method of using the apparatus for enhancing extraction of phosphate rock acidolysis slurry provided in application example 1, which is different from application example 1 in that the volume of microbubbles in the microbubble extractant is adjusted to 2% of the total volume of the microbubble extractant, and the rest is the same as application example 1.
Application example 5
The present application example provides a method of using the apparatus for enhancing extraction of phosphate rock acidolysis slurry provided in application example 1, which is different from application example 1 in that the volume of microbubbles in the microbubble extractant is adjusted to 15% of the total volume of the microbubble extractant, and the rest is the same as application example 1.
Application example 6
The application example provides a method for applying the device for enhancing the extraction of the acid hydrolysis slurry of phosphorite provided by the application example 2, and the steps of the method are the same as the application example 1.
Application example 7
The application example provides a method for applying the device for enhancing the extraction of the acid hydrolysis slurry of phosphorite provided by the embodiment 3, and the steps of the method are the same as the application example 1.
Application example 8
The application example provides a method for strengthening extraction of phosphate ore acidolysis slurry, which is provided by the application example 4, and the steps of the method are the same as the application example 1.
Application example 9
The application example provides a method for strengthening extraction of phosphate ore acidolysis slurry, which is provided by the application example 5, and the steps of the method are the same as the application example 1.
Comparative application example 1
This comparative application example provides a method of using the apparatus for enhancing extraction of acid hydrolyzed phosphate slurry provided in application example 1, and is different from application example 1 in that the same procedure as in application example 1 was repeated except that the microbubble extractant was replaced with a single ethylene glycol extractant at equal flow rates.
Comparative application example 2
The comparative application example provides a method using the device for enhancing the extraction of acidolysis slurry of phosphorite provided in comparative example 1, and the steps of the method are the same as in application example 1.
Comparative application example 3
The comparative application example provides a method using the apparatus for enhancing extraction of acid hydrolyzed phosphate slurry provided in comparative example 2, and the steps of the method are the same as in application example 1.
Comparative application example 4
This comparative application example provides a method using the apparatus for extraction of acid hydrolyzed phosphate slurry provided in comparative example 3, which has the same procedure as in application example 1.
The method provided by application examples 1-9 and comparative application examples 1-4 are adopted to extract the phosphorite acidolysis slurry, and the obtained extraction rate results are shown in table 1; extraction rate = (MER value of acid solution before extraction-MER value of acid solution after extraction) × 100%/MER value of acid solution before extraction; wherein the MER value is Fe in phosphoric acid 2 O 3 、Al 2 O 3 And total MgO content and P 2 O 5 Content in mass percent, fe 2 O 3 、Al 2 O 3 And MgO content measured by inductively coupled plasma emission spectrometer, P 2 O 5 The content is measured by a GB/T2091-2008 industrial phosphoquinmolybdic citranone gravimetric method.
TABLE 1
As can be seen from the table 1, the device for enhancing the extraction of the phosphorite acidolysis slurry provided by the invention enhances the mixing and extraction of the phosphorite acidolysis slurry and the extractant, and obviously improves the extraction rate;
compared with the application examples 4 and 5, the application example 1 shows that the volume of microbubbles in the microbubble extractant is too low, the strengthening effect on the dispersion and mixing of the phosphorite acidolysis slurry and the extractant is obviously reduced, and the volume is too high, so that the amount of the extractant in the extraction tower is reduced, the contact time of the extractant and the phosphorite acidolysis slurry is reduced, and the extraction rate is reduced; as can be seen from comparison of application example 1 with application examples 8 and 9, the ratio of the height to the diameter of the fluidized mixing section is too low, the extractant and the acidolysis slurry droplets are not dispersed and sufficiently mixed for a sufficient time, and the extraction rate is reduced; the ratio of the height to the diameter is too high, and the acidolysis slurry drops are aggregated and grow up again, so that the extraction is not facilitated;
as can be seen from the comparison between the application example 1 and the comparative application example 1, microbubbles are not introduced into the extractant, and the dispersion and mixing effect of the phosphorite acidolysis slurry and the extractant is reduced to some extent, so that the extraction rate is reduced; as can be seen from comparison of application example 1 with comparative application examples 2 and 3, the extraction rate is significantly reduced when the diameter of the fluidized mixing section is too small or too large; as can be seen from the comparison between the application example 1 and the comparative application example 4, the extraction tower is not provided with a fluidized mixing section, which is not beneficial to the dispersion and mixing of the phosphate rock acidolysis slurry and the extractant, thereby reducing the extraction rate.
In summary, according to the device provided by the invention, the fluidized mixing section is arranged in the tower body, and the diameter of the fluidized mixing section is limited, so that the extraction agent flowing upwards in a counter-current manner and the phosphorite acidolysis slurry flowing downwards in a co-current manner can be subjected to boiling mixing in the extraction process of the phosphorite acidolysis slurry; the microbubble is introduced into the extractant to form multiphase flow, which is favorable for the reinforced dispersion and mixing of the phosphate ore acidolysis slurry and the extractant in the fluidized mixing section, the extraction rate can reach 96.8 percent, and the high-efficiency extraction of the phosphate ore acidolysis slurry is realized.
The above description is only for the specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the protection scope and the disclosure of the present invention.
Claims (10)
1. The device for enhancing the extraction of the acid hydrolysis slurry of the phosphorite is characterized by comprising a tower body, wherein the tower body comprises a first layered section, a first connecting section, a fluidized mixing section, a second connecting section, an extraction section, a third connecting section and a second layered section which are sequentially arranged along the direction pointing to the bottom of the tower body;
the diameter D = D x phi of the fluidized mixing section 0.5 X (0.75-1.25); wherein d is the diameter of the extraction section, and phi is the aperture ratio of the extraction plate in the extraction section.
2. The apparatus according to claim 1, wherein the diameter d of the extraction section is 50-5000mm.
3. The apparatus of claim 1, wherein the extraction plate in the extraction section has an open porosity Φ of 15-30%.
4. The apparatus of claim 1 wherein the fluidized mixing section has a height to diameter ratio of (10-20): 1.
5. The apparatus according to claim 1, wherein the ratio of the diameter of the first separation section to the extraction section is (1.3-1.7): 1.
6. The apparatus of claim 1, wherein the ratio of the diameter of the second separation section to the diameter of the extraction section is (1.5-2.5): 1.
7. A method for strengthening the extraction of acid hydrolyzed phosphate slurry by using the device of any one of claims 1 to 6, which is characterized by comprising the following steps:
mixing and extracting the phosphorite acidolysis slurry and a microbubble extractant flowing upwards in a countercurrent manner, performing first separation treatment to obtain an extract and the phosphorite acidolysis slurry, and performing second separation treatment to obtain the extractant and the purified slurry.
8. The method of claim 7, wherein the volume of microbubbles in the microbubble extractant is 5-10% of the total volume of the microbubble extractant.
9. The method as claimed in claim 7, characterized in that the flow ratio of the microbubble extractant to the phosphorite acidolysis slurry is (0.5-50): 1.
10. The method according to claim 7, characterized in that it comprises the steps of:
mixing and extracting the phosphorite acidolysis slurry with the flow ratio of (0.5-50): 1 and a microbubble extractant flowing upwards in a countercurrent manner, performing first separation treatment to obtain an extract and the phosphorite acidolysis slurry, and performing second separation treatment to obtain the extractant and the purification slurry; the volume of microbubbles in the microbubble extracting agent is 5-10% of the total volume of the microbubble extracting agent.
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| WO2024125058A1 (en) * | 2022-12-13 | 2024-06-20 | 中国科学院过程工程研究所 | Method for separating and purifying phosphoric acid and phosphogypsum from wet-process phosphoric acid slurry, and phosphoric acid and phosphogypsum prepared thereby |
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