CN219730547U - Wet process phosphoric acid high-efficiency extraction system - Google Patents
Wet process phosphoric acid high-efficiency extraction system Download PDFInfo
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- CN219730547U CN219730547U CN202223416901.8U CN202223416901U CN219730547U CN 219730547 U CN219730547 U CN 219730547U CN 202223416901 U CN202223416901 U CN 202223416901U CN 219730547 U CN219730547 U CN 219730547U
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- 238000000605 extraction Methods 0.000 title claims abstract description 161
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 title claims abstract description 138
- 229910000147 aluminium phosphate Inorganic materials 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 42
- 230000008569 process Effects 0.000 title claims description 19
- 238000003860 storage Methods 0.000 claims abstract description 153
- 230000007246 mechanism Effects 0.000 claims abstract description 142
- 239000002253 acid Substances 0.000 claims abstract description 130
- 238000005406 washing Methods 0.000 claims abstract description 103
- 239000002904 solvent Substances 0.000 claims abstract description 92
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 63
- 239000002994 raw material Substances 0.000 claims abstract description 31
- 239000000463 material Substances 0.000 abstract description 28
- 238000004945 emulsification Methods 0.000 abstract description 18
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- 239000012071 phase Substances 0.000 description 31
- 238000000926 separation method Methods 0.000 description 9
- 230000005587 bubbling Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000000638 solvent extraction Methods 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 239000003350 kerosene Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000012074 organic phase Substances 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 1
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 150000001335 aliphatic alkanes Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- -1 metallurgy Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000005191 phase separation Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- STCOOQWBFONSKY-UHFFFAOYSA-N tributyl phosphate Chemical group CCCCOP(=O)(OCCCC)OCCCC STCOOQWBFONSKY-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model relates to the field of extraction equipment manufacture, and solves the problems that the existing wet-process phosphoric acid efficient extraction system has a plurality of bubbles in a system and has an emulsification phenomenon so that the quality of phosphoric acid is reduced. An extraction system comprising: the device comprises a solvent storage and conveying assembly, a pure water storage and conveying assembly, an extraction centrifugal mechanism, a washing centrifugal mechanism, a back extraction centrifugal mechanism, a raffinate storage part, a raw material acid storage and conveying assembly and a back extraction acid storage part; the solvent storage and conveying assembly is respectively communicated with the extraction centrifugal mechanism and the stripping centrifugal mechanism; the pure water storage and conveying assembly is respectively connected with the washing centrifugal mechanism and the stripping centrifugal mechanism; the extraction centrifugal mechanism is respectively connected with the washing centrifugal mechanism, the raw material acid storage and conveying assembly and the raffinate acid storage piece, and the washing centrifugal mechanism is respectively connected with the back extraction centrifugal mechanism and the raw material acid storage and conveying assembly; the stripping centrifugal mechanism is connected with a stripping acid storage piece. The emulsification and bubble phenomenon of the materials prepared by the system are improved.
Description
Technical Field
The utility model relates to the field of extraction equipment manufacturing, in particular to a wet-process phosphoric acid efficient extraction system.
Background
Phosphoric acid is an important intermediate in the phosphorus chemical industry and is widely applied to industries such as petroleum, metallurgy, chemical industry, electronics, medicine, food and the like. At present, the phosphoric acid production method mainly adopts an organic solvent purification method as a main means for purifying wet phosphoric acid, and has been positively and successfully used for industrial production.
Extraction equipment used in wet-process phosphoric acid solvent extraction processes is of various types, such as a mixer-clarifier, a sieve plate tower, a packing tower, a turntable tower, a centrifugal extractor and the like, wherein the centrifugal extraction equipment is used in the wet-process phosphoric acid solvent extraction process in recent years, can improve separation efficiency and reduce equipment volume, but can cause more bubbles and emulsification phenomena in a system to influence productivity and purification of phosphoric acid quality.
Therefore, the existing wet-process phosphoric acid efficient extraction system has the defects that the system has a plurality of bubbles and has an emulsification phenomenon, so that the quality of phosphoric acid is reduced.
Disclosure of Invention
The utility model aims to solve the problems that the existing wet-process phosphoric acid efficient extraction system has more bubbles in the system and has emulsification phenomenon so as to reduce the quality of phosphoric acid.
The specific technical scheme of the utility model is as follows:
a wet process phosphoric acid efficient extraction system comprising:
the device comprises a solvent storage and conveying assembly, a pure water storage and conveying assembly, an extraction centrifugal mechanism, a washing centrifugal mechanism, a back extraction centrifugal mechanism, a raffinate storage part, a raw material acid storage and conveying assembly and a back extraction acid storage part;
the solvent storage and conveying assembly is respectively communicated with the extraction centrifugal mechanism and the stripping centrifugal mechanism;
the pure water storage and conveying assembly is respectively connected with the washing centrifugal mechanism and the back extraction centrifugal mechanism;
the extraction centrifugal mechanism is respectively connected with the washing centrifugal mechanism, the raw material acid storage and conveying assembly and the raffinate acid storage piece, and the washing centrifugal mechanism is respectively connected with the back extraction centrifugal mechanism and the raw material acid storage and conveying assembly; the stripping centrifugal mechanism is connected with the stripping acid storage piece.
The working and using processes are as follows: when the system is used for preparing phosphoric acid by a wet method, pretreated phosphoric acid and solvent are respectively introduced into an extraction centrifugal mechanism, the solvent which is used for extracting the phosphoric acid by the extraction centrifugal mechanism and is used for obtaining the loaded phosphoric acid is introduced into a washing centrifugal mechanism for washing, and pure water is introduced into the washing centrifugal mechanism by a pure water storage and conveying assembly for auxiliary washing in the washing process.
After washing, the washed washing acid is mixed with the pretreated acid obtained in the previous working procedure through a raw material acid storage and transportation storage component and then transported back to the extraction centrifugal mechanism, and the solvent loaded with phosphoric acid after washing is introduced into the stripping centrifugal mechanism for stripping.
In the back extraction process, the pure water storage and conveying assembly introduces pure water into the back extraction centrifugal mechanism for auxiliary back extraction, back extracted acid (back extracted phosphoric acid) enters the back extracted acid storage part, and separated solvent enters the solvent storage and conveying assembly and is introduced into the extraction centrifugal mechanism through the solvent storage and conveying assembly.
According to the utility model, through the arrangement of the extraction centrifugal mechanism, the washing centrifugal mechanism, the back extraction centrifugal mechanism, the solvent storage and conveying assembly, the pure water storage and conveying assembly, the raffinate acid storage and conveying assembly and the back extraction acid storage assembly, the material temperature of the whole system and the pressure in a pipeline between centrifuges are effectively controlled, the emulsification and bubble phenomena of materials in the system are improved, and the quality and the production efficiency of phosphoric acid prepared by using the system are improved. When the system is used for wet phosphoric acid extraction, control nodes of the whole system are reduced, the operation is simplified, and industrial application is easier to realize; the bubbles in the phosphoric acid system prepared by the system are less, and the emulsification phenomenon is obviously reduced.
Optionally, the solvent storage and conveying assembly comprises a solvent storage tank, a solvent conveying pump connected with the discharge end of the solvent storage tank and a solvent heat exchanger connected with the solvent conveying pump, and the discharge end of the solvent heat exchanger is communicated with the extraction centrifugal mechanism.
Optionally, the pure water storage and conveying assembly comprises a pure water storage tank, a pure water washing section conveying pump and a pure water stripping section conveying pump, the outlet end of the pure water storage tank is respectively connected with the pure water washing section conveying pump and the pure water stripping section conveying pump, the pure water washing section conveying pump is connected with the washing centrifugal mechanism, and the pure water stripping section conveying pump is connected with the stripping centrifugal mechanism.
Optionally, the raw material acid storage and conveying assembly comprises a raw material acid storage tank connected with the washing centrifugal mechanism, a raw material acid conveying pump connected with the raw material acid storage tank and a raw material acid heat exchanger connected with the raw material acid conveying pump, and the raw material acid heat exchanger is connected with the extraction centrifugal mechanism.
Optionally, the back extraction acid storage part is a back extraction acid storage tank or a back extraction acid storage bottle.
Optionally, the raffinate storage part is a raffinate storage tank or a raffinate storage bottle.
Optionally, the extraction centrifuge mechanism comprises at least one extraction centrifuge in series.
Optionally, the washing centrifuge mechanism comprises at least one washing centrifuge in series.
Optionally, the stripping centrifugal mechanism comprises at least one stripping centrifugal machine connected in series.
Optionally, the wet-process phosphoric acid efficient extraction system further comprises negative pressure equipment, and the negative pressure equipment is respectively connected with the extraction centrifugal mechanism and the washing centrifugal mechanism.
Compared with the prior art, the utility model effectively controls the material temperature of the whole system and the pressure in the pipeline between centrifuges by arranging the extraction centrifugal mechanism, the washing centrifugal mechanism, the back extraction centrifugal mechanism, the solvent storage and conveying component, the pure water storage and conveying component, the raffinate storage component, the raw material acid storage and conveying component and the back extraction acid storage component, improves the emulsification and bubbling phenomena of the materials in the system, and improves the quality and the production efficiency of phosphoric acid prepared by using the system. When the system is used for wet phosphoric acid extraction, control nodes of the whole system are reduced, the operation is simplified, and industrial application is easier to realize; the bubbles in the phosphoric acid system prepared by the system are less, and the emulsification phenomenon is obviously reduced.
According to the utility model, the solvent storage and conveying assembly is arranged, so that the secondary storage of the solvent can be used for the next secondary use, and the production cost is reduced and the system has advantages when the system is used for preparing phosphoric acid by a wet method.
The pure water storage and conveying assembly is arranged to introduce auxiliary liquid into the washing centrifugal mechanism and the back extraction centrifugal mechanism, so that the washing and back extraction effects are better when the system is used for preparing phosphoric acid, the material temperature of the whole system is improved, and the phenomena of emulsification and bubbles in the system are further improved.
The utility model realizes the recovery and the utilization of the washing acid by arranging the raw material acid storage and conveying component, avoids excessive waste of materials when the system is used, and reduces the production cost.
According to the utility model, through the arrangement of the negative pressure equipment connected with the extraction centrifugal mechanism and the washing centrifugal mechanism, the temperature of the materials in the whole system and the pressure in the pipeline between the centrifuges can be effectively controlled, and the phenomena of emulsification and bubbling of the materials in the system are improved. Specifically, the pipeline gauge pressure of the connection of the centrifugal machine and the negative pressure pipeline between the extraction centrifugal mechanism and the washing centrifugal mechanism is set to be-50 kPa-0 kPa, so that bubbles of materials between most of the centrifugal machines can be eliminated, the condition of blocking the light phase (loaded phosphoric acid solvent) outlet of the centrifugal machine is improved, the productivity is improved, meanwhile, the connection is carried out on the pipeline, the equipment size is not changed, and the operation is easy.
According to the utility model, the centrifugal machines of the three mechanisms are connected through the light phase, the separation factors in each section of centrifugal machine are gradually increased, the effect of separating the organic phase from the water phase can be improved, and meanwhile, the separation factors of each section of centrifugal machine are gradually increased, so that the acid entrainment amount in the acid-containing solvent at each section of outlet is effectively controlled to be less than or equal to 0.5%, and the preparation of phosphoric acid with higher purity is facilitated.
Drawings
Fig. 1 is a schematic structural diagram of a wet-process phosphoric acid efficient extraction system according to an embodiment of the present utility model.
Fig. 2 is a schematic diagram of a wet-process phosphoric acid efficient extraction system according to a second embodiment of the present utility model.
Fig. 3 is a schematic diagram III of a wet-process phosphoric acid efficient extraction system according to an embodiment of the utility model.
Fig. 4 is a schematic structural diagram of a wet-process phosphoric acid efficient extraction system according to an embodiment of the present utility model.
The attached drawings are used for identifying and describing:
1. a solvent storage tank; 2. a solvent delivery pump; 3. a solvent heat exchanger; 4. a pure water storage tank; 5. pure water is sent to a washing section delivery pump; 6. pure water stripping section conveying pump; 7. a negative pressure device; 8. an extraction centrifugal mechanism; 9. a washing centrifugal mechanism; 10. a back extraction centrifugal mechanism; 11. a raffinate acid storage; 12. a raw material acid storage tank; 13. a raw acid delivery pump; 14. a raw acid heat exchanger; 15. a strip acid storage; 1#, a first extraction centrifuge; 2#, a second extraction centrifuge; 3#, a third extraction centrifuge; 4# a first washing centrifuge; 5# a second washing centrifuge; 6# and a third washing centrifuge; 7# a first strip centrifuge; 8#, a second stripping centrifuge; 9# and a third extraction centrifuge.
Detailed Description
Extraction equipment used in wet-process phosphoric acid solvent extraction processes is of various types, such as a mixer-clarifier, a sieve plate tower, a packing tower, a turntable tower, a centrifugal extractor and the like, wherein the centrifugal extraction equipment is used in the wet-process phosphoric acid solvent extraction process in recent years, can improve separation efficiency and reduce equipment volume, but can cause more bubbles and emulsification phenomena in a system to influence productivity and purification of phosphoric acid quality.
Therefore, the existing wet-process phosphoric acid efficient extraction system has the defects that the system has a plurality of bubbles and has an emulsification phenomenon, so that the quality of phosphoric acid is reduced.
Referring to fig. 1, an embodiment of the present utility model provides a wet process phosphoric acid efficient extraction system, which includes:
the device comprises a solvent storage and conveying assembly, a pure water storage and conveying assembly, an extraction centrifugal mechanism, a washing centrifugal mechanism, a back extraction centrifugal mechanism, a raffinate storage part, a raw material acid storage and conveying assembly and a back extraction acid storage part;
the solvent storage and conveying assembly is respectively communicated with the extraction centrifugal mechanism and the stripping centrifugal mechanism;
the pure water storage and conveying assembly is respectively connected with the washing centrifugal mechanism and the back extraction centrifugal mechanism;
the extraction centrifugal mechanism is respectively connected with the washing centrifugal mechanism, the raw material acid storage and conveying assembly and the raffinate acid storage piece, and the washing centrifugal mechanism is respectively connected with the back extraction centrifugal mechanism and the raw material acid storage and conveying assembly; the stripping centrifugal mechanism is connected with the stripping acid storage piece.
It can be understood that when the system is used for preparing phosphoric acid by a wet method, pretreated phosphoric acid and solvent are respectively introduced into an extraction centrifugal mechanism, the solvent which is used for extracting the phosphoric acid by the extraction centrifugal mechanism and is used for obtaining the loaded phosphoric acid is introduced into a washing centrifugal mechanism for washing, and pure water is introduced into the washing centrifugal mechanism by a pure water storage and conveying assembly for auxiliary washing in the washing process.
After washing, the washed washing acid is mixed with the pretreated acid obtained in the previous working procedure through a raw material acid storage and transportation storage component and then transported back to the extraction centrifugal mechanism, and the solvent loaded with phosphoric acid after washing is introduced into the stripping centrifugal mechanism for stripping.
In the back extraction process, the pure water storage and conveying assembly introduces pure water into the back extraction centrifugal mechanism for auxiliary back extraction, back extracted acid (back extracted phosphoric acid) enters the back extracted acid storage part, and separated solvent enters the solvent storage and conveying assembly and is introduced into the extraction centrifugal mechanism through the solvent storage and conveying assembly.
According to the utility model, through the arrangement of the extraction centrifugal mechanism, the washing centrifugal mechanism, the back extraction centrifugal mechanism, the solvent storage and conveying assembly, the pure water storage and conveying assembly, the raffinate acid storage and conveying assembly and the back extraction acid storage assembly, the material temperature of the whole system and the pressure in a pipeline between centrifuges are effectively controlled, the emulsification and bubble phenomena of materials in the system are improved, and the quality and the production efficiency of phosphoric acid prepared by using the system are improved. When the system is used for wet phosphoric acid, control nodes of the whole system are reduced, the operation is simplified, and industrial application is easier to realize; the bubbles in the phosphoric acid system prepared by the system are less, and the emulsification phenomenon is obviously reduced.
Referring to fig. 2, in some embodiments of the present utility model, the solvent storage and delivery assembly includes a solvent storage tank 1, a solvent delivery pump 2 connected to a discharge end of the solvent storage tank 1, and a solvent heat exchanger 3 connected to the solvent delivery pump 2, wherein a discharge end of the solvent heat exchanger 3 is in communication with the extraction centrifugal mechanism 8.
It will be appreciated that when the solvent separated in the stripping centrifugal mechanism 10 enters the solvent storage and delivery assembly, the solvent enters the solvent storage tank 1 through the feed end of the solvent storage tank 1, the solvent enters the solvent delivery pump 2 from the discharge end of the solvent storage tank 1, the solvent is pumped into the solvent heat exchanger 3 by the solvent delivery pump 2, and after the solvent heat exchanger 3 exchanges heat with the solvent, the solvent enters the extraction centrifugal mechanism 8 through the discharge end of the solvent heat exchanger 3 for extraction.
According to the utility model, the solvent storage and conveying assembly is arranged, so that the secondary storage of the solvent can be used for the next secondary use, and the production cost is reduced and the system has advantages when the system is used for preparing phosphoric acid by a wet method.
Referring to fig. 2, in some embodiments of the present utility model, the pure water storage and transportation assembly includes a pure water storage tank 4, a pure water washing stage transportation pump 5, and a pure water stripping stage transportation pump 6, wherein an outlet end of the pure water storage tank 4 is respectively connected to the pure water washing stage transportation pump 5 and the pure water stripping stage transportation pump 6, the pure water washing stage transportation pump 5 is connected to the washing centrifugal mechanism 9, and the pure water stripping stage transportation pump 6 is connected to the stripping centrifugal mechanism 10.
It will be appreciated that when the system is performing a wash, i.e. when material enters the wash centrifugal mechanism 9, the pure water removal washing section transfer pump 5 is turned on to introduce pure water stored in the pure water reservoir 4 into the wash centrifugal mechanism 9 to assist the wash. Meanwhile, when the system is in back extraction, namely materials enter the back extraction centrifugal mechanism 10, the pure water stripping section conveying pump 6 is started to work, and pure water stored in the pure water storage tank 4 is introduced into the back extraction centrifugal mechanism 10 to assist back extraction.
Referring to fig. 2, the pure water storage and conveying assembly is provided to introduce auxiliary liquid into the washing centrifugal mechanism 9 and the stripping centrifugal mechanism 10, so that the washing and stripping effects are better, the material temperature of the whole system is improved, and the phenomena of emulsification and bubbles in the system are improved when the system is used for preparing phosphoric acid.
Referring to fig. 2, in some embodiments of the utility model, the feed acid storage and delivery assembly includes a feed acid storage tank 12 connected to the washing centrifuge 9, a feed acid delivery pump 13 connected to the feed acid storage tank 12, and a feed acid heat exchanger 14 connected to the feed acid delivery pump 13, the feed acid heat exchanger 14 being connected to the extraction centrifuge 8.
It can be understood that after the washing centrifugal mechanism 9 finishes washing the material, raw acid enters the raw acid storage tank 12, the raw acid delivery pump 13 is started, the raw acid in the raw acid storage tank 12 is pumped into the raw acid heat exchanger 14, the raw acid heat exchanger 14 exchanges heat with the raw acid and then is introduced into the extraction centrifugal mechanism 8 for next extraction, so that the recovery and utilization of the washing acid are realized, excessive waste of the material when the system is used is avoided, and the production cost is reduced.
According to the utility model, the raw material acid storage and conveying assembly is arranged, so that the raw material acid is recycled and utilized, excessive waste of materials is avoided when the system is used, and the production cost is reduced.
Referring to fig. 2, in some embodiments of the utility model, the strip acid storage 15 is a strip acid storage tank or a strip acid storage bottle.
It will be appreciated that a strip acid storage tank or strip acid storage bottle is used to store strip acid.
Referring to fig. 2, in some embodiments of the utility model, the spent acid storage unit 11 is a spent acid storage tank or a spent acid storage bottle.
It is understood that a spent acid storage tank or a spent acid storage bottle is used to store the spent acid.
Referring to fig. 3 or with continued reference to fig. 4, in some embodiments of the present utility model, the wet phosphoric acid efficient extraction system further includes a negative pressure device 7, where the negative pressure device 7 is connected to the extraction centrifugal mechanism 8 and the washing centrifugal mechanism 9, respectively.
It can be understood that the utility model can effectively control the temperature of the materials in the whole system and the pressure in the pipeline between the centrifuges by arranging the negative pressure equipment 7 connected with the extraction centrifugal mechanism 8 and the washing centrifugal mechanism 9, thereby improving the phenomena of emulsification and bubbling of the materials in the system.
In some embodiments of the utility model, the pipe gauge pressure of the centrifuge-to-negative pressure pipe connection between the extraction centrifugal mechanism 8 and the washing centrifugal mechanism 9 is set to-50 kPa to 0kPa.
It can be understood that the air bubbles of materials between most centrifuges can be eliminated by the arrangement, the blocking condition of a light phase outlet of the centrifuges is improved, the productivity is improved, meanwhile, the connection is carried out on a pipeline, the equipment size is not changed, and the operation is easy.
Specifically, in some embodiments of the present utility model, the upper part of the light-heavy phase pipeline connected between the first extraction centrifuge 1#, the second extraction centrifuge 2#, the third extraction centrifuge 3#, the first washing centrifuge 4#, the second washing centrifuge 5#, the third washing centrifuge 6# and the first stripping centrifuge 7# is connected with a negative pressure pipeline, so that the pipeline between the centrifuges is kept at normal pressure and micro negative pressure.
The pipeline gauge pressure of the pipeline connected with the negative pressure equipment 7 between the first extraction centrifugal machine 1#, the second extraction centrifugal machine 2#, the third extraction centrifugal machine 3#, the first washing centrifugal machine 4#, the second washing centrifugal machine 5#, the third washing centrifugal machine 6# and the first back extraction centrifugal machine 7# is-50 kPa-0 kPa.
In some embodiments of the utility model, the extraction centrifugal mechanism 8, the washing centrifugal mechanism 9 and the stripping centrifugal mechanism 10 are respectively 1-9, preferably 2-3, centrifuges in series.
In some embodiments of the present utility model, the centrifuge light phases of the three mechanisms of extraction centrifuge mechanism 8, washing centrifuge mechanism 9 and stripping centrifuge mechanism 10 are connected, while the separation factor in each stage of centrifuge is increased stepwise.
It can be understood that the light phase of the centrifuges of the three mechanisms is connected, the separation factor in each section of centrifuges is gradually increased, the separation effect of the organic phase and the water phase can be improved, and meanwhile, the separation factor of each section of centrifuges is gradually increased, so that the acid entrainment amount in the acid-containing solvent at each section of outlet is effectively controlled to be less than or equal to 0.5%, and the preparation of phosphoric acid with higher purity is facilitated.
In some embodiments of the utility model, the pipeline gauge pressure connected with the negative pressure pipeline between the first extraction centrifugal machine 1# and the first back extraction centrifugal machine 7# is-50 kPa to 0kPa.
It can be understood that the gauge pressure of the pipeline connected with the negative pressure pipeline between the first extraction centrifugal machine 1# and the first stripping centrifugal machine 7# is set to be-50 kPa-0 kPa, so that bubbles of most materials between the centrifugal machines can be eliminated, the condition of blocking a light phase outlet of the centrifugal machine is improved, the productivity is improved, and meanwhile, the pipeline is connected without changing the equipment size, and the operation is easy.
Specifically, as a more specific embodiment, the wet-process phosphoric acid efficient extraction system comprises a material storage tank, a material conveying pipeline, each heat exchanger, an extraction centrifugal mechanism 8, a washing centrifugal mechanism 9, a stripping centrifugal mechanism 10 and a negative pressure device 7.
A solvent delivery pump 2 is connected between the outlet of the solvent storage tank 1 and the inlet of the solvent heat exchanger 3, and is used for delivering the solvent to the solvent heat exchanger 3.
The outlet of the solvent heat exchanger 3 is connected with the light phase inlet of a first extraction centrifuge 1# of the extraction centrifugal mechanism 8, and is used for controlling the temperature of the solvent in a proper range, and then the solvent reaching the requirement is conveyed to the extraction centrifugal mechanism 8 through the solvent conveying pump 2.
A raw acid delivery pump 13 is connected between the outlet of the raw acid storage tank 12 and the inlet of the raw acid heat exchanger 14 for delivering raw acid to the raw acid heat exchanger 14.
The outlet of the raw acid heat exchanger 14 is connected with the heavy phase inlet of the third extraction centrifuge 3# of the extraction centrifuge 8, and is used for controlling the temperature of the raw acid in a proper range, and then the raw acid reaching the requirement is conveyed to the extraction centrifuge 8 through the raw acid conveying pump 13.
The extraction centrifugal mechanism 8 is formed by connecting 3 centrifuges in series, and comprises a first extraction centrifugal machine 1#, a second extraction centrifugal machine 2#, and a third extraction centrifugal machine 3#. The light phase inlet of the first extraction centrifuge 1# is connected with the outlet of the solvent heat exchanger 3, the heavy phase outlet of the first extraction centrifuge 1# is connected with the raffinate acid storage tank, the heavy phase inlet of the third extraction centrifuge 3# is connected with the outlet of the raw material acid heat exchanger 14, the light phase outlet of the third extraction centrifuge 3# is connected with the light phase inlet of the first washing centrifuge 4# of the washing section and is used for carrying out countercurrent extraction and two-phase separation on solvent and raw material acid, the extracted extraction section is loaded with acid solvent and is conveyed to the washing centrifugal mechanism 9, and raffinate acid enters the raffinate acid storage tank.
The washing centrifugal mechanism 9 is formed by connecting 3 centrifuges in series and comprises a first washing centrifugal machine 4#, a second washing centrifugal machine 5#, and a third washing centrifugal machine 6#. The light phase inlet of the first washing centrifugal machine 4# is connected with the light phase outlet of the third extraction centrifugal machine 3#, the heavy phase outlet of the first washing centrifugal machine 4# is connected with the raw material acid storage tank 12, the heavy phase inlet of the third washing centrifugal machine 6# is connected with the pure water storage tank 4, the light phase outlet of the third washing centrifugal machine 6# is connected with the light phase inlet of the first stripping centrifugal machine 7# of the stripping section and is used for washing the loaded acid solvent of the extraction section by pure water, the loaded acid solvent of the washing section after washing is conveyed to the stripping centrifugal mechanism 10, and the washing acid enters the raw material acid storage tank.
The stripping centrifugal mechanism 10 is formed by connecting 3 centrifuges in series, and comprises a first stripping centrifugal machine 7#, a second stripping centrifugal machine 8#, and a third stripping centrifugal machine 9#, wherein a light phase inlet of the first stripping centrifugal machine 7# is connected with a light phase outlet of a third washing centrifugal machine 6#, a heavy phase outlet of the first stripping centrifugal machine 7# is connected with a stripping acid pipeline, a heavy phase inlet of the third stripping centrifugal machine 9# is connected with a pure water pipeline, a light phase outlet of the third stripping centrifugal machine 9# is connected with a solvent storage tank 1, and the light phase outlet of the third stripping centrifugal machine 9# is used for stripping the acid solvent loaded on the washing section, so that the acid solvent loaded on the washing section completely enters the pure water, the no-load solvent obtained returns to the solvent storage tank 1, and the stripping acid enters the stripping acid storage tank.
The negative pressure equipment 7 is connected with a negative pressure pipeline, and the upper part of a light-heavy phase pipeline connected between the first extraction centrifugal machine 1# and the first stripping centrifugal machine 7# is connected with the negative pressure pipeline, so that the pipeline between the centrifugal machines is kept at normal pressure and micro negative pressure.
Preferably, the solvent of the system is tributyl phosphate and methyl isobutyl ketone which are mixed with one or more of kerosene, sulfonated kerosene and 11-alkane-16 alkane according to different proportions.
Preferably, the starting acid is P 2 O 5 The concentration is 20-60%;
preferably, the temperature of the solvent and the raw material acid is 40-100 ℃;
preferably, each section of centrifugal machines of the extraction centrifugal mechanism 8, the washing centrifugal mechanism 9 and the back extraction centrifugal mechanism 10 is respectively provided with 1-9 centrifugal machines which are connected in series, and preferably 2-3 centrifugal machines;
preferably, the extraction centrifugal mechanism 8, the washing centrifugal mechanism 9 and the back extraction centrifugal mechanism 103 are connected in light phase, and the separation factor in each section of centrifugal machine is gradually increased;
preferably, the pipeline gauge pressure connected with the negative pressure pipeline between the first extraction centrifugal machine 1# and the first stripping centrifugal machine 7# is-50 kPa to 0kPa.
Preferably, a delivery pump is arranged between the solvent storage tank 1 and the solvent heat exchanger 3;
preferably, a transfer pump is provided between the feed acid storage tank 12 and the feed acid heat exchanger 14.
The wet-process phosphoric acid efficient extraction system effectively controls the material temperature of the whole system and the pressure in the pipeline between the centrifuges, improves the phenomena of emulsification and bubbling of materials in the system, and improves the quality and production efficiency of purified phosphoric acid; meanwhile, 3 operation units of extraction, washing and back extraction are controlled by adopting a mode of connecting a plurality of centrifuges in series and controlling the temperature and flow of the material at the front end inlet, so that the control nodes of the whole system are reduced, the operation is simplified, and the industrialized application is easier to realize. The front end of the system controls parameters such as temperature, phase ratio and the like, reduces control nodes of the whole system, further simplifies operation, and is beneficial to more stable operation of materials.
The above embodiments are merely preferred embodiments of the present utility model, and are not intended to limit the present utility model, so that any modifications, equivalents, improvements, etc. made within the principles of the present utility model should be included in the scope of the present utility model.
Claims (10)
1. A wet process phosphoric acid efficient extraction system, comprising:
the device comprises a solvent storage and conveying assembly, a pure water storage and conveying assembly, an extraction centrifugal mechanism, a washing centrifugal mechanism, a back extraction centrifugal mechanism, a raffinate storage part, a raw material acid storage and conveying assembly and a back extraction acid storage part;
the solvent storage and conveying assembly is respectively communicated with the extraction centrifugal mechanism and the stripping centrifugal mechanism;
the pure water storage and conveying assembly is respectively connected with the washing centrifugal mechanism and the back extraction centrifugal mechanism;
the extraction centrifugal mechanism is respectively connected with the washing centrifugal mechanism, the raw material acid storage and conveying assembly and the raffinate acid storage piece, and the washing centrifugal mechanism is respectively connected with the back extraction centrifugal mechanism and the raw material acid storage and conveying assembly; the stripping centrifugal mechanism is connected with the stripping acid storage piece.
2. The efficient wet process phosphoric acid extraction system of claim 1, wherein the solvent storage and delivery assembly comprises a solvent storage tank, a solvent delivery pump connected with the discharge end of the solvent storage tank, and a solvent heat exchanger connected with the solvent delivery pump, and the discharge end of the solvent heat exchanger is communicated with the extraction centrifugal mechanism.
3. The wet process phosphoric acid efficient extraction system according to claim 1, wherein the pure water storage and transportation assembly comprises a pure water storage tank, a pure water washing section transportation pump and a pure water stripping section transportation pump, the outlet end of the pure water storage tank is respectively connected with the pure water washing section transportation pump and the pure water stripping section transportation pump, the pure water washing section transportation pump is connected with the washing centrifugal mechanism, and the pure water stripping section transportation pump is connected with the stripping centrifugal mechanism.
4. The wet process phosphoric acid efficient extraction system of claim 1, wherein the feed acid storage and delivery assembly comprises a feed acid storage tank connected to the washing centrifuge, a feed acid delivery pump connected to the feed acid storage tank, and a feed acid heat exchanger connected to the feed acid delivery pump, the feed acid heat exchanger being connected to the extraction centrifuge.
5. The wet process phosphoric acid efficient extraction system of claim 1, wherein the strip acid storage is a strip acid storage tank or a strip acid storage bottle.
6. The wet process phosphoric acid efficient extraction system of claim 5, wherein the raffinate storage is a raffinate storage tank or a raffinate storage bottle.
7. The wet process phosphoric acid efficient extraction system according to claim 1, wherein: the extraction centrifuge mechanism includes at least one extraction centrifuge in series.
8. The wet process phosphoric acid efficient extraction system of claim 1, wherein the wash centrifuge mechanism comprises at least one wash centrifuge in series.
9. The wet process phosphoric acid efficient extraction system of claim 1, wherein the stripping centrifuge mechanism comprises at least one stripping centrifuge in series.
10. The wet process phosphoric acid efficient extraction system of claim 9, further comprising a negative pressure device connected to the extraction centrifuge and the washing centrifuge, respectively.
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