CN201458731U

CN201458731U - Device for purifying phosphoric acid

Info

Publication number: CN201458731U
Application number: CN2009201255873U
Authority: CN
Inventors: 王邵东; 骆广生; 禹志宏; 颜鹏
Original assignee: Wengfu Group Co Ltd
Current assignee: Wengfu Group Co Ltd
Priority date: 2009-07-30
Filing date: 2009-07-30
Publication date: 2010-05-12
Anticipated expiration: 2019-07-30

Abstract

The utility model discloses a device for purifying phosphoric acid, comprising an extraction plant, a cleaning plant and a back extraction plant, wherein the extraction plant and the back extraction plant comprise two sets of blenders and phase separation plants, or one or more additional sets of blenders and phase separation plants, the cleaning plant comprises a set of blender and phase separation plant and a set of emulsifying machine and phase separation plant, or one or more additional sets of blenders and phase separation plants (or emulsifying machines and phase separation plants). A continuous-phase fluid inlet of the extraction plant is connected with a light-phase outlet of the final phase separation plant of the back extraction plant, a continuous-phase fluid inlet of the cleaning plant is connected with a final light-phase outlet of the extraction plant, and a continuous-phase fluid inlet of the back extraction plant is connected with a final light-phase outlet of the cleaning plant. The device for purifying phosphoric acid can strengthen mass transfer performance, increase purification efficiency, reduce equipment investment and running expense, and save floor space.

Description

Phosphoric acid purification device

Technical field

The utility model relates to this chemical industry equipment field, relates in particular to a kind of phosphoric acid purification device.

Background technology

Realize that with solvent extraction technology phosphoric acid purification is a phosphoric acid purification technology commonly used at present, solvent extraction technology generally comprises extraction, washing, reaches the back extraction operation.The chemical industry equipment that can realize extraction, washing, back extraction function at present is mainly as follows: multistage mixing-clarifying tank, it is a kind of typically contact liquid liquid mass transfer apparatus step by step, wherein every grade comprises mulser and clarifying tank two portions, this equipment main drawback has: horizontal multistage mixing-tempering tank floor space is bigger, be equipped with whipping appts in each level, fluid generally needs to use pump delivery flowing of inter-stage, and cost of equipment and process cost are all bigger; Sieve-tray tower, the weight two-phase is made counter-current flow in tower, and two-phase is the cross-flow contact on every block of column plate, and this tower mass-transfer efficiency is than higher, but its internal structure is complicated, and manufacturing cost is higher, the internal cleaning difficulty; Packing tower, the packing tower structure is simple relatively, but efficient is lower, can not be used to have the material of solid particulate and easy fouling; Pulsed packed tower and pulsed sieve plate column, in order to improve the two-phase contact condition, the reinforcing mass transfer process, add mechanical energy causing pulsation at packing tower and sieve-tray tower, and the generation of pulsation is realized by reciprocation pump or pressurized air usually, this kind equipment mass-transfer efficiency height, but manufacturing cost is higher, the internal cleaning difficulty, and working cost is higher; Sieve plate is fixed on the central shaft in the oscillating screen plate tower, oscillating screen plate tower, is driven by toggle, and this tower is limited by equipment material, and it is very difficult to maximize, and working cost is higher.

Mixing tank has important application in numerous hybrid reactions fields such as chemistry, chemical industry, petrochemical industry, medicine and food.This equipment mass transfer area is big, the reaction conversion ratio height; Cost of equipment is low, and is simple to operate; Regulate single passage width and parallel access volume and accomplish scale production, the device processes amount is big.Chinese patent publication number CN1625777A, disclosed on 02 22nd, 2006 " a kind of multi-channeled micro-structured reactor ", continuous phase fluid enters reactor from the inlet tube distribution chamber in this reactor, dispersed phase fluid is passed dispersion medium and is entered the external phase parallel channels, under continuous phase fluid flows shear action, be dispersed into fine droplet or bubble, contact, realize short mix and reaction between two-phase fluid with continuous phase fluid.

The rotor of mulser and stator are under the high-speed driving of motor, bear the inferior shearing action of hundreds of thousands of at short notice, because the powerful kinetic energy that high linear speed that the rotor high-speed rotation is produced and high frequency machinery effect belt come, make that material is subjected to intensive machinery and fluid power shearing, centrifugal extruding, liquid layer friction in the accurate gap of stator and rotor, high-speed impact is torn with comprehensive action such as turbulent flow under division, broken, disperse, thereby make immiscible material in the abundant dispersion in moment uniform, fine ground, emulsification, homogeneous, dissolving.Mulser is widely used in fine chemistry industry at present: resin emulsification, silicone oil emulsification, carbon black dispersion, fillers dispersed etc.; Be applied to petrochemical complex: heavy oil emulsive, emulsified bitumen, wax emulsification etc.; Biological medicine: microcapsule emulsification, medicine emulsion, cell tissue fragmentation etc.

Summary of the invention

The purpose of this utility model be to overcome above-mentioned shortcoming and provide a kind of can the reinforcing mass transfer performance, improve purification efficiency, reduce facility investment and working cost and the little phosphoric acid purification device of floor space.

A kind of phosphoric acid purification device of the present utility model, comprise extraction plant, washing device and back extraction device, wherein: extraction plant secondary light phase export is connected with washing device mixing tank A continuous phase fluid inlet, washing device phase splitting device B light phase export is connected with back extraction device continuous phase fluid inlet, and back extraction device secondary light phase export is connected with extraction plant continuous phase fluid inlet;

Extraction plant comprises extraction plant mixing tank and extraction plant phase splitting device, extraction plant secondary mixing tank and extraction plant secondary phase splitting device, the extraction plant mixing tank is provided with extraction plant continuous phase fluid inlet, extraction plant dispersed phase fluid inlet and the outlet of extraction plant mixed phase fluid, the extraction plant phase splitting device is provided with the import of extraction plant mixed phase, extraction plant heavy out and extraction plant light phase export, and the outlet of extraction plant mixed phase fluid is connected with the import of extraction plant mixed phase; Extraction plant secondary mixing tank is provided with extraction plant secondary continuous phase fluid inlet extraction plant and connects secondary dispersed phase fluid inlet and the outlet of extraction plant secondary mixed phase fluid, extraction plant secondary phase splitting device is provided with the import of extraction plant secondary mixed phase, extraction plant secondary heavy out and extraction plant secondary light phase export, and the outlet of extraction plant secondary mixed phase fluid is connected with the import of extraction plant secondary mixed phase; The extraction plant light phase export is connected with extraction plant secondary continuous phase fluid inlet; Extraction plant secondary heavy out is connected with extraction plant dispersed phase fluid inlet;

Washing device comprises washing device mixing tank A and washing device phase splitting device A, washing device mulser A and washing device phase splitting device B, washing device mixing tank A is provided with washing device mixing tank A continuous phase fluid inlet, washing device mixing tank A dispersed phase fluid inlet and the outlet of washing device mixing tank A mixed phase fluid, washing device phase splitting device A is provided with the import of washing device phase splitting device A mixed phase, washing device phase splitting device A heavy out and washing device phase splitting device A light phase export, the outlet of washing device mixing tank A mixed phase fluid is connected with the import of washing device phase splitting device A mixed phase; Washing device mulser A is provided with A import of washing device mulser and washing device mulser A outlet, washing device phase splitting device B is provided with the import of washing device phase splitting device B mixed phase, washing device phase splitting device B heavy out and washing device phase splitting device B light phase export, washing device mulser A import is connected with import of washing device phosphoric acid and washing device solvent inlet, and washing device mulser A outlet is connected with the import of washing device phase splitting device B mixed phase; Washing device phase splitting device A light phase export is connected with the washing device solvent inlet, and washing device phase splitting device B heavy out is connected with washing device mixing tank A dispersed phase fluid inlet;

Back extraction device comprises back extraction device mixing tank and back extraction device phase splitting device, back extraction device secondary mixing tank and back extraction device secondary phase splitting device, the back extraction device mixing tank is provided with back extraction device continuous phase fluid inlet, back extraction device connects dispersed phase fluid inlet and the outlet of back extraction device mixed phase fluid, the back extraction device phase splitting device is provided with the import of back extraction device mixed phase, back extraction device heavy out and back extraction device light phase export, and the outlet of back extraction device mixed phase fluid is connected with the import of back extraction device mixed phase; Back extraction device secondary mixing tank is provided with back extraction device secondary continuous phase fluid inlet back extraction device and connects secondary dispersed phase fluid inlet and the outlet of back extraction device secondary mixed phase fluid, back extraction device secondary phase splitting device is provided with the import of back extraction device secondary mixed phase, back extraction device secondary heavy out and back extraction device secondary light phase export, and the outlet of back extraction device secondary mixed phase fluid is connected with the import of back extraction device secondary mixed phase; The back extraction device light phase export is connected with back extraction device secondary continuous phase fluid inlet; Back extraction device secondary heavy out connects the dispersed phase fluid inlet by pipeline and back extraction device and is connected.

Above-mentioned phosphoric acid purification device, wherein: extraction plant comprises three grades of mixing tanks of extraction plant and three grades of phase-splitting equipment of extraction plant, three grades of mixing tanks of extraction plant are provided with extraction plant three grades of continuous phase fluid inlets, extraction plants and connect three grades of dispersion phase fluid inlets and three grades of mixed phase fluid outlets of extraction plant, three grades of phase-splitting equipment of extraction plant are provided with three grades of mixed phase imports of extraction plant, three grades of heavy outs of extraction plant and three grades of light phase exports of extraction plant, and three grades of mixed phase fluid outlets of extraction plant are connected with three grades of mixed phase imports of extraction plant; Three grades of continuous phase fluid inlets of extraction plant secondary light phase export and extraction plant are connected, three grades of heavy outs of extraction plant are connected with extraction plant secondary dispersed phase fluid inlet, and three grades of light phase exports of extraction plant are connected with washing device mixing tank A continuous phase fluid inlet;

Washing device comprises washing device mixing tank B and washing device phase splitting device C, washing device mixing tank B is provided with washing device mixing tank B continuous phase fluid inlet, washing device mixing tank B dispersed phase fluid inlet and the outlet of washing device mixing tank B mixed phase fluid, washing device phase splitting device C is provided with the import of washing device phase splitting device C mixed phase, washing device phase splitting device C heavy out and washing device phase splitting device C light phase export, and the outlet of washing device mixing tank B mixed phase fluid is connected with the import of washing device phase splitting device C mixed phase; Washing device phase splitting device B light phase export is connected with washing device mixing tank B continuous phase fluid inlet, washing device phase splitting device C heavy out is connected with the import of washing device phosphoric acid, and washing device phase splitting device C light phase export is connected with back extraction device continuous phase fluid inlet.

Back extraction device comprises three grades of mixing tanks of back extraction device and three grades of phase-splitting equipment of back extraction device, three grades of mixing tanks of back extraction device are provided with back extraction device three grades of continuous phase fluid inlets, back extraction devices and connect three grades of dispersion phase fluid inlets and three grades of mixed phase fluid outlets of back extraction device, three grades of phase-splitting equipment of back extraction device are provided with three grades of mixed phase imports of back extraction device, three grades of heavy outs of back extraction device and three grades of light phase exports of back extraction device, and three grades of mixed phase fluid outlets of back extraction device are connected with three grades of mixed phase imports of back extraction device; Three grades of continuous phase fluid inlets of back extraction device secondary light phase export and back extraction device are connected, and three grades of heavy outs of back extraction device are connected with back extraction device secondary dispersed phase fluid inlet, and three grades of light phase exports of back extraction device are connected with extraction plant continuous phase fluid inlet.

Washing device comprises washing device mulser B and washing device phase splitting device D, washing device mulser B is provided with B import of washing device mulser and washing device mulser B outlet, washing device phase splitting device D is provided with the import of washing device phase splitting device B mixed phase, washing device phase splitting device B heavy out and washing device phase splitting device B light phase export, three grades of phosphoric acid imports of washing device mulser B import and washing device and three grades of solvent inlets of washing device are connected, and washing device mulser B outlet is connected with the import of washing device phase splitting device B mixed phase.Three grades of solvent inlets of washing device phase splitting device B light phase export and washing device are connected, and washing device phase splitting device B heavy out is connected with the import of washing device phosphoric acid, and washing device phase splitting device B light phase export is connected with back extraction device continuous phase fluid inlet.

Above-mentioned phosphoric acid purification device, wherein: phase splitting device is the equipment that phase-splitting groove, clarifying tank etc. reach the phase-splitting purpose.

Above-mentioned phosphoric acid purification device, wherein: mulser is the pipeline high-shearing dispersion emulsifying machine.

The utility model compared with prior art, as can be known from the above technical solutions, require difference according to purifying, the extraction plant, the back extraction device that constitute phosphoric acid purification device are selected two groups of mixing tanks and phase splitting device for use, or increase by one group or polyhybrid device and phase splitting device on aforesaid combination; Washing device is selected the combination of one group of mixing tank and phase splitting device and one group of mulser and phase splitting device for use, or increasing multistage that one or more groups mixing tank and phase splitting device (or mulser and phase splitting device) constitute on the aforesaid combination. in the phosphoric acid purification process, feed phosphoric acid (fresh phosphoric) adds by final stage extraction plant mixer disperses phase fluid inlet, washing acid (purifying phosphoric acid), mixing tank by the final stage washing device, the dispersed phase fluid inlet of mulser, the phosphoric acid import adds, de-salted water adds by the mixer disperses phase fluid inlet of final stage back extraction device. and the no-load solvent of extraction plant continuous phase fluid inlet is from back extraction device final stage light phase export, the loaded solvent of washing device continuous phase fluid inlet is from extraction plant final stage light phase export, the loaded solvent of back extraction device continuous phase fluid inlet is from washing device final stage light phase export. because mixing tank, the mulser mass transfer area is big, the mass-transfer efficiency height. from mixing tank, the mixed solution that mulser comes out is easy to phase-splitting, thereby guaranteeing to divide phase effect. the purifying phosphoric acid foreign matter content that obtains is low, but by refining production food grade and electron-level phosphoric acid. system's material loading level is little, avoids hazardous material (fluids) (as phosphoric acid, organic extractant) leaks in a large number and the peace ring accident that causes; Mixing tank, mulser floor space are little, and appliance arrangement is arranged simple, and factory building can be realized miniaturization; Mixing tank, mulser cost are low, can save facility investment.

Description of drawings

Fig. 1 is embodiment 1 structural representation;

Fig. 2 is embodiment 2 structural representations;

Fig. 3 is embodiment 3 structural representations.

Mark among the figure:

1, the extraction plant mixing tank, 2, the extraction plant phase splitting device, 3, extraction plant continuous phase fluid inlet, 4, extraction plant dispersed phase fluid inlet, 5, the outlet of extraction plant mixed phase fluid, 6, the import of extraction plant mixed phase, 7, the extraction plant light phase export, 8, the extraction plant heavy out, 9, extraction plant secondary mixing tank, 10, extraction plant secondary phase splitting device, 11, extraction plant secondary continuous phase fluid inlet, 12, extraction plant secondary dispersed phase fluid inlet, 13, the outlet of extraction plant secondary mixed phase fluid, 14, the import of extraction plant secondary mixed phase, 15, extraction plant secondary light phase export, 16, extraction plant secondary heavy out, 17, three grades of mixing tanks of extraction plant, 18, three grades of phase-splitting equipment of extraction plant, 19, three grades of continuous phase fluid inlets of extraction plant, 20, extraction plant disperses the phase fluid inlet for three grades, 21, three grades of mixed phase fluid outlets of extraction plant, 22, three grades of mixed phase imports of extraction plant, 23, three grades of light phase exports of extraction plant, 24, three grades of heavy out .25 of extraction plant, washing device mixing tank A, 26, washing device phase splitting device A, 27, washing device mixing tank A continuous phase fluid inlet, 28, washing device mixing tank A dispersed phase fluid inlet, 29, the outlet of washing device mixing tank A mixed phase fluid, 30, the import of washing device phase splitting device A mixed phase, 31, washing device phase splitting device A light phase export, 32, washing device phase splitting device A heavy out, 33, washing device mulser A, 34, washing device phase splitting device B, 35, washing device mulser A import, 36, washing device mulser A outlet, 37, the import of washing device phase splitting device B mixed phase, 38, washing device phase splitting device B heavy out, 39, washing device phase splitting device B light phase export, 40, the import of washing device phosphoric acid, 41, the washing device solvent inlet, 42, washing device mixing tank B, 43, washing device phase splitting device C, 44, washing device mixing tank B continuous phase fluid inlet, 45, washing device mixing tank B dispersed phase fluid inlet, 46, the outlet of washing device mixing tank B mixed phase fluid, 47, the import of washing device phase splitting device C mixed phase, 48, washing device phase splitting device C light phase export, 49, washing device phase splitting device C heavy out, 50, washing device mulser B, 51, washing device phase splitting device D, 52, washing device mulser B import, 53, washing device mulser B outlet, 54, the import of washing device phase splitting device D mixed phase, 55, washing device phase splitting device D heavy out, 56, washing device phase splitting device D light phase export, 57, three grades of phosphoric acid imports of washing device, 58, three grades of solvent inlets of washing device, 59, the back extraction device mixing tank, 60, the back extraction device phase splitting device, 61, back extraction device continuous phase fluid inlet, 62, back extraction device dispersed phase fluid inlet, 63, the outlet of back extraction device mixed phase fluid, 64, the import of back extraction device mixed phase, 65, the back extraction device light phase export, 66, the back extraction device heavy out, 67, back extraction device secondary mixing tank, 68, back extraction device secondary phase splitting device, 69, back extraction device secondary continuous phase fluid inlet, 70, back extraction device secondary dispersed phase fluid inlet, 71, the outlet of back extraction device secondary mixed phase fluid, 72, the import of back extraction device secondary mixed phase, 73, back extraction device secondary light phase export, 74, back extraction device secondary heavy out, 75, three grades of mixing tanks of back extraction device, 76, three grades of phase-splitting equipment of back extraction device, 77, three grades of continuous phase fluid inlets of back extraction device, 78, back extraction device disperses phase fluid inlet, 79 for three grades, three grades of mixed phase fluid outlets of back extraction device, 80, three grades of mixed phase imports of back extraction device, 81, three grades of light phase exports of back extraction device, 82, three grades of heavy outs of back extraction device.

Embodiment

Below in conjunction with accompanying drawing, its embodiment of phosphoric acid purification device, structure, feature and effect thereof to foundation the utility model proposes are described in detail as follows:

Embodiment 1

Referring to Fig. 1, adopt the phosphoric acid purification device of two-stage extraction, washing and back extraction, comprise extraction plant, washing device and back extraction device, wherein: extraction plant secondary light phase export 15 is connected with washing device mixing tank A continuous phase fluid inlet 27, washing device phase splitting device B light phase export 39 is connected with back extraction device continuous phase fluid inlet 61, and back extraction device secondary light phase export 73 is connected with extraction plant continuous phase fluid inlet 3;

Extraction plant comprises extraction plant mixing tank 1 and extraction plant phase splitting device 2, extraction plant secondary mixing tank 9 and extraction plant secondary phase splitting device 10, extraction plant mixing tank 1 is provided with extraction plant continuous phase fluid inlet 3, extraction plant dispersed phase fluid inlet 4 and extraction plant mixed phase fluid outlet 5, extraction plant phase splitting device 2 is provided with extraction plant mixed phase import 6, extraction plant heavy out 8 and extraction plant light phase export 7, and extraction plant mixed phase fluid outlet 5 is connected with extraction plant mixed phase import 6; Extraction plant secondary mixing tank 9 is provided with extraction plant secondary continuous phase fluid 11 extraction plants that enter the mouth and connects secondary dispersed phase fluid inlet 12 and extraction plant secondary mixed phase fluid outlet 13, extraction plant secondary phase splitting device 10 is provided with extraction plant secondary mixed phase import 14, extraction plant secondary heavy out 16 and extraction plant secondary light phase export 15, and extraction plant secondary mixed phase fluid outlet 13 is connected with extraction plant secondary mixed phase import 14; Extraction plant light phase export 7 is connected with extraction plant secondary continuous phase fluid inlet 11 by the pipeline that is provided with pump; Extraction plant secondary heavy out 16 is connected with extraction plant dispersed phase fluid inlet 4 by the pipeline that is provided with pump;

Washing device comprises washing device mixing tank A25 and washing device phase splitting device A26, washing device mulser A33 and washing device phase splitting device B34, washing device mixing tank A25 is provided with washing device mixing tank A continuous phase fluid inlet 27, washing device mixing tank A dispersed phase fluid inlet 28 and washing device mixing tank A mixed phase fluid outlet 29, washing device phase splitting device A26 is provided with washing device phase splitting device A mixed phase import 30, washing device phase splitting device A heavy out 32 and washing device phase splitting device A light phase export 31, washing device mixing tank A mixed phase fluid outlet 29 are connected with washing device phase splitting device A mixed phase import 30; Washing device mulser A33 is provided with washing device mulser A import 35 and washing device mulser A outlet 36, washing device phase splitting device B34 is provided with washing device phase splitting device B mixed phase import 37, washing device phase splitting device B heavy out 38 and washing device phase splitting device B light phase export 39, washing device mulser A import 35 is connected with washing device phosphoric acid import 40 and washing device solvent inlet 41, and washing device mulser A outlet 36 is connected with washing device phase splitting device B mixed phase import 37; Washing device phase splitting device A light phase export 31 is connected with washing device solvent inlet 41, and washing device phase splitting device B heavy out 38 is connected with washing device mixing tank A dispersed phase fluid inlet 28;

Back extraction device comprises back extraction device mixing tank 59 and back extraction device phase splitting device 60, back extraction device secondary mixing tank 67 and back extraction device secondary phase splitting device 68, back extraction device mixing tank 59 is provided with back extraction device continuous phase fluid inlet 61, back extraction device connects dispersed phase fluid inlet 62 and back extraction device mixed phase fluid outlet 63, back extraction device phase splitting device 60 is provided with back extraction device mixed phase import 64, back extraction device heavy out 66 and back extraction device light phase export 65, and back extraction device mixed phase fluid outlet 63 is connected with back extraction device mixed phase import 64; Back extraction device secondary mixing tank 67 is provided with back extraction device secondary continuous phase fluid 69 back extraction devices that enter the mouth and connects secondary dispersed phase fluid inlet 70 and back extraction device secondary mixed phase fluid outlet 71, back extraction device secondary phase splitting device 68 is provided with back extraction device secondary mixed phase import 72, back extraction device secondary heavy out 74 and back extraction device secondary light phase export 73, and back extraction device secondary mixed phase fluid outlet 71 is connected with back extraction device secondary mixed phase import 72; Back extraction device light phase export 65 is connected with back extraction device secondary continuous phase fluid inlet 69; Back extraction device secondary heavy out 74 connects dispersed phase fluid inlet 62 by pipeline and back extraction device and is connected.

During use: at extraction plant, the phosphoric acid that extraction plant secondary heavy out 16 comes out, the no-load solvent of return extraction plant dispersed phase fluid inlet 4 under the effect of pump, coming from back extraction device enters extraction plant mixing tank 1 from extraction plant continuous phase fluid inlet 3, solvent and phosphoric acid are finished the efficient mass transfer process in extraction plant mixing tank 1, the mixed phase that forms comes out from extraction plant mixed phase fluid outlet 5, enters extraction plant phase splitting device 2 by extraction plant mixed phase import 6.In extraction plant phase splitting device 2, realize the layering of mixed phase, light, the heavy two-phase of formation.Impurity in the phosphoric acid enters heavy phase becomes raffinate from 8 discharges of extraction plant heavy out, phosphoric acid is become loaded solvent by solvent extraction and comes out from extraction plant light phase export 7, enters extraction plant secondary mixing tank 9 through extraction plant secondary continuous phase fluid inlet 11 under the effect of pump.Fresh phosphoric enters extraction plant secondary mixing tank 9 through extraction plant secondary dispersed phase fluid inlet 12, efficient mass transfer effect by extraction plant secondary mixing tank 9, further improve the effect of extracting of phosphoric acid, the mixed phase that forms comes out from extraction plant secondary mixed phase fluid outlet 13, enter extraction plant secondary phase splitting device 10 by extraction plant secondary phase splitting device mixed phase import 14, in extraction plant secondary phase splitting device 10, realize the layering of mixed phase, what form is light, heavy two-phase, phosphoric acid is become loaded solvent by solvent extraction and enters washing device from extraction plant secondary light phase export 15, and the impurity in the phosphoric acid enters heavy phase and returns extraction plant mixing tank 1 by extraction plant heavy out 16.

At washing device, the phosphoric acid that comes out from washing device phase splitting device B heavy out 38 under the effect of pump from washing device mixing tank A dispersed phase fluid inlet 28, enter washing device mixing tank A25 from washing device mixing tank A continuous phase fluid inlet 27 from the loaded solvent of extraction plant, loaded solvent and phosphoric acid are finished the efficient mass transfer process in washing device mixing tank A25, the mixed phase that forms comes out from washing device mixing tank A mixed phase fluid outlet 29, enters washing device phase splitting device A26 by washing device phase splitting device A mixed phase import 30.In washing device phase splitting device A26, realize the layering of mixed phase, light, the heavy two-phase of formation.Impurity enters heavy phase to be become and washes spent acid and discharge from washing device phase splitting device A heavy out 32, the loaded solvent of eccysis partial impurities comes out from washing device phase splitting device B light phase export 31, enters washing device mulser A33 through washing device solvent inlet 41 under the effect of pump; Washing acid (purifying phosphoric acid) enters washing device mulser A33 through washing device phosphoric acid import 40, efficient mass transfer effect by washing device mulser A33, further improve washing effect, the mixed phase that forms comes out from washing device mulser A outlet 36, enter washing device phase splitting device B34 by washing device phase splitting device B mixed phase import 37, in washing device phase splitting device B34, realize the layering of mixed phase, what form is light, heavy two-phase, the loaded solvent that has been purified by phosphoric acid washing enters back extraction device continuous phase fluid inlet 61 from washing device phase splitting device B light phase export 39, heavy phase is then returned washing device mixing tank A25 by washing device phase splitting device B heavy out 38, thereby realizes washing, purifying.

At back extraction device, the phosphoric acid that back extraction device back extraction device secondary heavy out 74 comes out, under the effect of pump, return back extraction device back extraction device dispersed phase fluid inlet 62, the loaded solvent that comes from washing device enters back extraction device mixing tank 59 from back extraction device continuous phase fluid inlet 61, loaded solvent and phosphoric acid are finished the efficient mass transfer process in back extraction device mixing tank 59, the mixed phase that forms comes out from back extraction device mixed phase fluid outlet 63, enter back extraction device phase splitting device 60. is realized mixed phase in back extraction device phase splitting device 60 layering by back extraction device mixed phase import 64, what form is light, heavy two-phase. the phosphoric acid in the loaded solvent enters heavy phase becomes purifying phosphoric acid from 66 discharges of back extraction device heavy out, the loaded solvent of being taken off part phosphoric acid comes out from back extraction device light phase export 65, under the effect of pump, enter back extraction device secondary mixing tank 67. de-salted waters and enter back extraction device secondary mixing tank 67 through back extraction device secondary dispersed phase fluid inlet 70 through back extraction device secondary continuous phase fluid inlet 69, efficient mass transfer effect by back extraction device secondary mixing tank 67, further improve the back extraction effect of loaded solvent, the mixed phase that forms comes out from back extraction device secondary mixed phase fluid outlet 71, enter back extraction device secondary phase splitting device 68 by back extraction device secondary phase splitting device mixed phase import 72, in back extraction device secondary phase splitting device 68, realize the layering of mixed phase, what form is light, heavy two-phase, loaded solvent removes and then becomes no-load solvent behind the phosphoric acid and return extraction plant from back extraction device secondary light phase export 73, and the phosphoric acid in the loaded solvent enters heavy phase and returns back extraction device mixing tank 59. by back extraction device heavy out 74

Embodiment 2

Referring to Fig. 2, adopt three grades of extractions, the phosphoric acid purification device of washing and back extraction, comprise extraction plant, washing device and back extraction device, wherein: extraction plant comprises three grades of mixing tanks 17 of extraction plant and three grades of phase-splitting equipment 18 of extraction plant, three grades of mixing tanks 17 of extraction plant are provided with three grades of continuous phase fluid inlets 19 of extraction plant, extraction plant connects three grades and disperses phase fluid inlet 20 and three grades of mixed phase fluid outlets 21 of extraction plant, three grades of phase-splitting equipment 18 of extraction plant are provided with three grades of mixed phase imports 22 of extraction plant, three grades of heavy outs 24 of extraction plant and three grades of light phase exports 23 of extraction plant, three grades of mixed phase fluid of extraction plant outlet 21 are connected with three grades of mixed phase imports 22 of extraction plant; Three grades of continuous phase fluid inlets 19 of extraction plant secondary light phase export 15 and extraction plant are connected, three grades of heavy outs 24 of extraction plant are connected with extraction plant secondary dispersed phase fluid inlet 12, and three grades of light phase exports 23 of extraction plant are connected with washing device mixing tank A continuous phase fluid inlet 27;

Washing device comprises washing device mixing tank B42 and washing device phase splitting device C43, washing device mixing tank B42 is provided with washing device mixing tank B continuous phase fluid inlet 44, washing device mixing tank B dispersed phase fluid inlet 45 and washing device mixing tank B mixed phase fluid outlet 46, washing device phase splitting device C43 is provided with washing device phase splitting device C mixed phase import 47, washing device phase splitting device C heavy out 49 and washing device phase splitting device C light phase export 48, washing device mixing tank B mixed phase fluid outlet 46 are connected with washing device phase splitting device C mixed phase import 47; Washing device phase splitting device B light phase export 39 is connected with washing device mixing tank B continuous phase fluid inlet 44, washing device phase splitting device C heavy out 49 is connected with washing device phosphoric acid import 40, and washing device phase splitting device C light phase export 48 is connected with back extraction device continuous phase fluid inlet 61.

Back extraction device comprises three grades of mixing tanks 75 of back extraction device and three grades of phase-splitting equipment 76 of back extraction device, three grades of mixing tanks 75 of back extraction device are provided with back extraction device three grades of continuous phase fluid inlets 77, back extraction devices and connect three grades of dispersion phase fluid inlets 78 and three grades of mixed phase fluid outlets 79 of back extraction device, three grades of phase-splitting equipment 76 of back extraction device are provided with three grades of mixed phase imports 80 of back extraction device, three grades of heavy outs 82 of back extraction device and three grades of light phase exports 81 of back extraction device, and three grades of mixed phase fluid of back extraction device outlet 79 is connected with three grades of mixed phase imports 80 of back extraction device; Three grades of continuous phase fluid inlets 77 of back extraction device secondary light phase export 73 and back extraction device are connected, three grades of heavy outs 82 of back extraction device are connected with back extraction device secondary dispersed phase fluid inlet 70, and three grades of light phase exports 81 of back extraction device are connected with extraction plant continuous phase fluid inlet 3.All the other are with embodiment 1.

During use, at extraction plant, the phosphoric acid that extraction plant secondary heavy out 16 comes out, under the effect of pump, return extraction plant dispersed phase fluid inlet 4, the no-load solvent of coming from back extraction device enters extraction plant mixing tank 1 from extraction plant continuous phase fluid inlet 3, solvent and phosphoric acid are finished the efficient mass transfer process in extraction plant mixing tank 1, the mixed phase that forms comes out from extraction plant mixed phase fluid outlet 5, enter extraction plant phase splitting device 2. is realized mixed phase in extraction plant phase splitting device 2 layering by extraction plant mixed phase import 6, what form is light, heavy two-phase. the impurity in the phosphoric acid enters heavy phase becomes raffinate from 8 discharges of extraction plant heavy out, phosphoric acid is become loaded solvent by solvent extraction and comes out from extraction plant light phase export 7, under the effect of pump, enter the phosphoric acid that three grades of heavy outs 24 of extraction plant secondary mixing tank 9. extraction plants come out through extraction plant secondary continuous phase fluid inlet 11, under the effect of pump, return extraction plant secondary mixing tank 9, efficient mass transfer effect by extraction plant secondary mixing tank 9, the mixed phase that forms comes out from extraction plant secondary mixed phase fluid outlet 13, enter extraction plant secondary phase splitting device 10 by extraction plant secondary phase splitting device mixed phase import 14, in extraction plant secondary phase splitting device 10, realize the layering of mixed phase, what form is light, heavy two-phase, impurity in the phosphoric acid enters heavy phase and returns extraction plant mixing tank 1. loaded solvents by extraction plant heavy out 16 and come out from extraction plant secondary light phase export 15, under the effect of pump, enter the mouth 19 through three grades of continuous phase fluids of extraction plant, fresh phosphoric disperses phase fluid inlet 20 to enter three grades of mixing tanks 17 of extraction plant through three grades of extraction plants, efficient mass transfer effect by multi-stage solvent extraction device mixing tank has improved the phosphoric acid extraction effect as much as possible; The mixed phase that forms comes out from three grades of mixed phase fluid outlets 21 of extraction plant, enter three grades of phase-splitting equipment 18 of extraction plant by three grades of mixed phase imports 22 of extraction plant, in three grades of phase-splitting equipment 18 of extraction plant, realize the layering of mixed phase, light, the heavy two-phase that forms, phosphoric acid is become loaded solvent by solvent extraction and comes out to enter washing device from three grades of light phase exports of extraction plant 23, and the impurity in the phosphoric acid enters heavy phase and returns extraction plant secondary mixing tank 9. by three grades of heavy outs 24 of extraction plant

At washing device, loaded solvent comes out, enters the mouth 44 through washing device mixing tank B continuous phase fluid under the effect of pump from washing device phase splitting device B light phase export 39, and washing acid (purifying phosphoric acid) enters washing device mixing tank B42 through washing device mixing tank B dispersed phase fluid inlet 45; The mixed phase that forms comes out from washing device mixing tank B mixed phase fluid outlet 46, enter washing device phase splitting device C43 by washing device phase splitting device C mixed phase import 47, in washing device phase splitting device C43, realize the layering of mixed phase, light, the heavy two-phase that forms, washing, purifying loaded solvent come out to enter back extraction device from washing device phase splitting device C light phase export 48; Heavy phase is then returned washing device mulser A33 by washing device phase splitting device C heavy out 49, the loaded solvent that enters with washing device solvent inlet 41 is by the efficient mass transfer effect of washing device mulser A33, the mixed phase that forms comes out from washing device mulser A outlet 36, enter washing device phase splitting device B34 by washing device phase splitting device B mixed phase import 37, in washing device phase splitting device B34, realize the layering of mixed phase, what form is light, heavy two-phase, washing, purifying loaded solvent enter washing device mixing tank B42 from washing device phase splitting device B light phase export 39.Heavy phase is then returned washing device mixing tank A dispersed phase fluid inlet 28 by washing device phase splitting device B heavy out 38, loaded solvent from extraction plant enters washing device mixing tank A25 from washing device mixing tank A continuous phase fluid inlet 27, loaded solvent and phosphoric acid are finished the efficient mass transfer process in washing device mixing tank A25, the mixed phase that forms comes out from washing device mixing tank A mixed phase fluid outlet 29, enters washing device phase splitting device A26 by washing device phase splitting device A mixed phase import 30.In washing device phase splitting device A26, realize the layering of mixed phase, light, the heavy two-phase of formation.Impurity in the loaded solvent enters heavy phase to be become and washes spent acid and discharge from washing device phase splitting device A heavy out 32.The loaded solvent of washing impurity off comes out from washing device phase splitting device A light phase export 31, enters washing device mulser A33 through washing device solvent inlet 41 under the effect of pump.

The phosphoric acid that comes out at back extraction device secondary heavy out 74, under the effect of pump, return back extraction device back extraction device dispersed phase fluid inlet 62, the loaded solvent that comes from washing device enters back extraction device mixing tank 59 from back extraction device continuous phase fluid inlet 61, loaded solvent and phosphoric acid are finished the efficient mass transfer process in back extraction device mixing tank 59, the mixed phase that forms comes out from back extraction device mixed phase fluid outlet 63, enter back extraction device phase splitting device 60. is realized mixed phase in back extraction device phase splitting device 60 layering by back extraction device mixed phase import 64, what form is light, heavy two-phase. the phosphoric acid in the loaded solvent enters heavy phase becomes purifying phosphoric acid from 66 discharges of back extraction device heavy out, the loaded solvent of being taken off part phosphoric acid comes out from back extraction device light phase export 65, under the effect of pump, enter the phosphoric acid that three grades of heavy outs 82 of back extraction device secondary mixing tank 67. back extraction devices come out through back extraction device secondary continuous phase fluid inlet 69, under the effect of pump, return back extraction device secondary mixing tank 67, efficient mass transfer effect by back extraction device secondary mixing tank 67, the mixed phase that forms comes out from back extraction device secondary mixed phase fluid outlet 71, enter back extraction device secondary phase splitting device 68 by back extraction device secondary phase splitting device mixed phase import 72, in back extraction device secondary phase splitting device 68, realize the layering of mixed phase, what form is light, heavy two-phase, phosphoric acid in the loaded solvent enters heavy phase and returns the loaded solvent that back extraction device mixing tank 59. also contains part phosphoric acid by back extraction device heavy out 74 and come out from back extraction device secondary light phase export 73, under the effect of pump, enter the mouth 77 through three grades of continuous phase fluids of back extraction device, de-salted water disperses phase fluid inlet 78 to enter three grades of mixing tanks 75 of back extraction device through three grades of back extraction devices, by the efficient mass transfer effect of multistage back extraction device mixing tank, improved phosphoric acid back extraction effect as much as possible; The mixed phase that forms comes out from three grades of mixed phase fluid outlets 79 of back extraction device, enter three grades of phase-splitting equipment 76 of back extraction device by three grades of phase-splitting equipment of back extraction device mixed phase import 80, in three grades of phase-splitting equipment 76 of back extraction device, realize the layering of mixed phase, what form is light, heavy two-phase, loaded solvent removes and then becomes no-load solvent behind the phosphoric acid and come out to return extraction plant from three grades of light phase exports of back extraction device 81, phosphoric acid in the loaded solvent enters heavy phase and returns back extraction device secondary mixing tank 67. by three grades of back extractions by three grades of heavy outs 82 of back extraction device, phosphoric acid in the loaded solvent is desalted the water back extraction and enters heavy phase finally from the discharge of back extraction device phase splitting device heavy phase mouth, becomes purifying phosphoric acid. and all the other are with embodiment 1.

Embodiment 3

Referring to Fig. 3, adopt three grades of extractions, the phosphoric acid purification device of washing and back extraction, comprise extraction plant, washing device and back extraction device, wherein: extraction plant comprises three grades of mixing tanks 17 of extraction plant and three grades of phase-splitting equipment 18 of extraction plant, three grades of mixing tanks 17 of extraction plant are provided with three grades of continuous phase fluid inlets 19 of extraction plant, extraction plant connects three grades and disperses phase fluid inlet 20 and three grades of mixed phase fluid outlets 21 of extraction plant, three grades of phase-splitting equipment 18 of extraction plant are provided with three grades of mixed phase imports 22 of extraction plant, three grades of heavy outs 24 of extraction plant and three grades of light phase exports 23 of extraction plant, three grades of mixed phase fluid of extraction plant outlet 21 are connected with three grades of mixed phase imports 22 of extraction plant; Three grades of continuous phase fluid inlets 19 of extraction plant secondary light phase export 15 and extraction plant are connected, three grades of heavy outs 24 of extraction plant are connected with extraction plant secondary dispersed phase fluid inlet 12, and three grades of light phase exports 23 of extraction plant are connected with washing device mixing tank A continuous phase fluid inlet 27;

Washing device comprises washing device mulser B50 and washing device phase splitting device D51, washing device mulser B50 is provided with washing device mulser B import 52 and washing device mulser B outlet 53, washing device phase splitting device D51 is provided with washing device phase splitting device B mixed phase import 54, washing device phase splitting device B heavy out 55 and washing device phase splitting device B light phase export 56, three grades of phosphoric acid imports 57 of washing device mulser B import 52 and washing device and three grades of solvent inlets 58 of washing device are connected, and washing device mulser B outlet 53 is connected with washing device phase splitting device B mixed phase import 54.Three grades of solvent inlets 58 of washing device phase splitting device B light phase export 39 and washing device are connected, washing device phase splitting device B heavy out 55 is connected with washing device phosphoric acid import 40, and washing device phase splitting device B light phase export 56 is connected with back extraction device continuous phase fluid inlet 61.

During use, at extraction plant, its principle of work is with embodiment 2.

At washing device, the loaded solvent that comes out from washing device phase splitting device B light phase export 39, enter washing device mulser B50 through three grades of solvent inlets 58 of washing device under the effect of pump, washing acid (purifying phosphoric acid) enters washing device mulser B50 through three grades of phosphoric acid imports 57 of washing device; The mixed phase that forms comes out from washing device mulser B outlet 53, enter washing device phase splitting device D51 by washing device phase splitting device D mixed phase import 54, in washing device phase splitting device D51, realize the layering of mixed phase, light, the heavy two-phase that forms, washing, purifying loaded solvent come out to enter back extraction device from washing device phase splitting device D light phase export 56; Heavy phase is then come out by washing device phase splitting device D heavy out 55, returns washing device mulser A33 by washing device phosphoric acid import 40 under the effect of pump; Loaded solvent comes out from washing device phase splitting device A light phase export 31, under the effect of pump, enter washing device mulser A33 through washing device solvent inlet 41, efficient mass transfer effect by washing device mulser A33, the mixed phase that forms comes out from washing device mulser A outlet 36, enter washing device phase splitting device B34 by washing device phase splitting device B mixed phase import 37, in washing device phase splitting device B34, realize the layering of mixed phase, what form is light, heavy two-phase. loaded solvent enters washing device mulser B50 from washing device phase splitting device B light phase export 39, heavy phase then enters the mouth 28 from washing device mixing tank A dispersed phase fluid by washing device phase splitting device B heavy out 38 under the effect of pump, loaded solvent all enters washing device mixing tank A25 from washing device mixing tank A continuous phase fluid inlet 27, loaded solvent and phosphoric acid are finished the efficient mass transfer process in washing device mixing tank A25, the mixed phase that forms comes out from washing device mixing tank A mixed phase fluid outlet 29, enter washing device phase splitting device A26. realizes mixed phase in washing device phase splitting device A26 layering by washing device phase splitting device A mixed phase import 30, what form is light, heavy two-phase. the impurity in the loaded solvent enters heavy phase to be become and washes spent acid and discharge from washing device phase splitting device A heavy out 32, and the loaded solvent of washing impurity off comes out to enter washing device mulser A33. from washing device phase splitting device A light phase export 31

At back extraction device, its principle of work is with embodiment 2.

More than among three embodiment: mulser adopts the pipeline high-shearing dispersion emulsifying machine; Phase splitting device adopts phase-splitting groove, clarifying tank etc. to reach the equipment of phase-splitting purpose; Mixing tank adopts Chinese patent publication number CN1625777A, open day: on 02 22nd, 2006, disclosed " a kind of multi-channeled micro-structured reactor ".

The above, it only is preferred embodiment of the present utility model, be not that the utility model is done any pro forma restriction, any technical solutions of the utility model content that do not break away from,, all still belong in the scope of technical solutions of the utility model any simple modification, equivalent variations and modification that above embodiment did according to technical spirit of the present utility model.

Claims

1. phosphoric acid purification device, comprise extraction plant, washing device and back extraction device, it is characterized in that: extraction plant secondary light phase export (15) is connected with washing device mixing tank A continuous phase fluid inlet (27), washing device phase splitting device B light phase export (39) is connected with back extraction device continuous phase fluid inlet (61), and back extraction device secondary light phase export (73) is connected with extraction plant continuous phase fluid inlet (3);

Extraction plant comprises extraction plant mixing tank (1) and extraction plant phase splitting device (2), extraction plant secondary mixing tank (9) and extraction plant secondary phase splitting device (10), extraction plant mixing tank (1) is provided with extraction plant continuous phase fluid inlet (3), extraction plant dispersed phase fluid inlet (4) and extraction plant mixed phase fluid outlet (5), extraction plant phase splitting device (2) is provided with extraction plant mixed phase import (6), extraction plant heavy out (8) and extraction plant light phase export (7), extraction plant mixed phase fluid outlet (5) is connected with extraction plant mixed phase import (6); Extraction plant secondary mixing tank (9) is provided with extraction plant secondary continuous phase fluid inlet (11) extraction plant and connects secondary dispersed phase fluid inlet (12) and extraction plant secondary mixed phase fluid outlet (13), extraction plant secondary phase splitting device (10) is provided with extraction plant secondary mixed phase import (14), extraction plant secondary heavy out (16) and extraction plant secondary light phase export (15), and extraction plant secondary mixed phase fluid outlet (13) is connected with extraction plant secondary mixed phase import (14); Extraction plant light phase export (7) is connected with extraction plant secondary continuous phase fluid inlet (11); Extraction plant secondary heavy out (16) is connected with extraction plant dispersed phase fluid inlet (4);

Washing device comprises washing device mixing tank A (25) and washing device phase splitting device A (26), washing device mulser A (33) and washing device phase splitting device B (34), washing device mixing tank A (25) is provided with washing device mixing tank A continuous phase fluid inlet (27), washing device mixing tank A dispersed phase fluid inlet (28) and washing device mixing tank A mixed phase fluid outlet (29), washing device phase splitting device A (26) is provided with washing device phase splitting device A mixed phase import (30), washing device phase splitting device A heavy out (32) and washing device phase splitting device A light phase export (31), washing device mixing tank A mixed phase fluid outlet (29) is connected with washing device phase splitting device A mixed phase import (30); Washing device mulser A (33) is provided with washing device mulser A import (35) and washing device mulser A outlet (36), washing device phase splitting device B (34) is provided with washing device phase splitting device B mixed phase import (37), washing device phase splitting device B heavy out (38) and washing device phase splitting device B light phase export (39), washing device mulser A import (35) is connected with washing device phosphoric acid import (40) and washing device solvent inlet (41), and washing device mulser A outlet (36) is connected with washing device phase splitting device B mixed phase import (37); Washing device phase splitting device A light phase export (31) is connected with washing device solvent inlet (41), and washing device phase splitting device B heavy out (38) is connected with washing device mixing tank A dispersed phase fluid inlet (28);

Back extraction device comprises back extraction device mixing tank (59) and back extraction device phase splitting device (60), back extraction device secondary mixing tank (67) and back extraction device secondary phase splitting device (68), back extraction device mixing tank (59) is provided with back extraction device continuous phase fluid inlet (61), back extraction device connects dispersed phase fluid inlet (62) and back extraction device mixed phase fluid outlet (63), back extraction device phase splitting device (60) is provided with back extraction device mixed phase import (64), back extraction device heavy out (66) and back extraction device light phase export (65), back extraction device mixed phase fluid outlet (63) is connected with back extraction device mixed phase import (64); Back extraction device secondary mixing tank (67) is provided with back extraction device secondary continuous phase fluid inlet (69) back extraction device and connects secondary dispersed phase fluid inlet (70) and back extraction device secondary mixed phase fluid outlet (71), back extraction device secondary phase splitting device (68) is provided with back extraction device secondary mixed phase import (72), back extraction device secondary heavy out (74) and back extraction device secondary light phase export (73), and back extraction device secondary mixed phase fluid outlet (71) is connected with back extraction device secondary mixed phase import (72); Back extraction device light phase export (65) is connected with back extraction device secondary continuous phase fluid inlet (69); Back extraction device secondary heavy out (74) connects dispersed phase fluid inlet (62) by pipeline and back extraction device and is connected.

2. phosphoric acid purification device as claimed in claim 1, it is characterized in that: extraction plant comprises three grades of mixing tanks of extraction plant (17) and three grades of phase-splitting equipment of extraction plant (18), three grades of mixing tanks of extraction plant (17) are provided with three grades of continuous phase fluid inlets of extraction plant (19), extraction plant connects three grades and disperses phase fluid inlet (20) and three grades of mixed phase fluid outlets of extraction plant (21), three grades of phase-splitting equipment of extraction plant (18) are provided with three grades of mixed phase imports of extraction plant (22), three grades of light phase exports of three grades of heavy outs of extraction plant (24) and extraction plant (23), three grades of mixed phase fluid outlets of extraction plant (21) are connected with three grades of mixed phase imports of extraction plant (22); Extraction plant secondary light phase export (15) is connected with three grades of continuous phase fluid inlets of extraction plant (19), three grades of heavy outs of extraction plant (24) are connected with extraction plant secondary dispersed phase fluid inlet (12), and three grades of light phase exports of extraction plant (23) are connected with washing device mixing tank A continuous phase fluid inlet (27);

Washing device comprises washing device mixing tank B (42) and washing device phase splitting device C (43), washing device mixing tank B (42) is provided with washing device mixing tank B continuous phase fluid inlet (44), washing device mixing tank B dispersed phase fluid inlet (45) and washing device mixing tank B mixed phase fluid outlet (46), washing device phase splitting device C (43) is provided with washing device phase splitting device C mixed phase import (47), washing device phase splitting device C heavy out (49) and washing device phase splitting device C light phase export (48), washing device mixing tank B mixed phase fluid outlet (46) is connected with washing device phase splitting device C mixed phase import (47); Washing device phase splitting device B light phase export (39) is connected with washing device mixing tank B continuous phase fluid inlet (44), washing device phase splitting device C heavy out (49) is connected with washing device phosphoric acid import (40), and washing device phase splitting device C light phase export (48) is connected with back extraction device continuous phase fluid inlet (61);

Back extraction device comprises three grades of mixing tanks of back extraction device (75) and three grades of phase-splitting equipment of back extraction device (76), three grades of mixing tanks of back extraction device (75) are provided with three grades of continuous phase fluid inlets of back extraction device (77), back extraction device connects three grades and disperses phase fluid inlet (78) and three grades of mixed phase fluid outlets of back extraction device (79), three grades of phase-splitting equipment of back extraction device (76) are provided with three grades of mixed phase imports of back extraction device (80), three grades of light phase exports of three grades of heavy outs of back extraction device (82) and back extraction device (81), three grades of mixed phase fluid outlets of back extraction device (79) are connected with three grades of mixed phase imports of back extraction device (80); Back extraction device secondary light phase export (73) is connected with three grades of continuous phase fluid inlets of back extraction device (77), three grades of heavy outs of back extraction device (82) are connected with back extraction device secondary dispersed phase fluid inlet (70), and three grades of light phase exports of back extraction device (81) are connected with extraction plant continuous phase fluid inlet (3).

3. phosphoric acid purification device as claimed in claim 1, it is characterized in that: extraction plant comprises three grades of mixing tanks of extraction plant (17) and three grades of phase-splitting equipment of extraction plant (18), three grades of mixing tanks of extraction plant (17) are provided with three grades of continuous phase fluid inlets of extraction plant (19), extraction plant connects three grades and disperses phase fluid inlet (20) and three grades of mixed phase fluid outlets of extraction plant (21), three grades of phase-splitting equipment of extraction plant (18) are provided with three grades of mixed phase imports of extraction plant (22), three grades of light phase exports of three grades of heavy outs of extraction plant (24) and extraction plant (23), three grades of mixed phase fluid outlets of extraction plant (21) are connected with three grades of mixed phase imports of extraction plant (22); Extraction plant secondary light phase export (15) is connected with three grades of continuous phase fluid inlets of extraction plant (19), three grades of heavy outs of extraction plant (24) are connected with extraction plant secondary dispersed phase fluid inlet (12), and three grades of light phase exports of extraction plant (23) are connected with washing device mixing tank A continuous phase fluid inlet (27);

Washing device comprises washing device mulser B50 and washing device phase splitting device D (51), washing device mulser B (50) is provided with washing device mulser B import (52) and washing device mulser B outlet (53), washing device phase splitting device D (51) is provided with washing device phase splitting device B mixed phase import (54), washing device phase splitting device B heavy out (55) and washing device phase splitting device B light phase export (56), washing device mulser B import (52) is connected with three grades of phosphoric acid imports of washing device (57) and three grades of solvent inlets of washing device (58), and washing device mulser B outlet (53) is connected with washing device phase splitting device B mixed phase import (54); Washing device phase splitting device B light phase export (39) is connected with three grades of solvent inlets of washing device (58), washing device phase splitting device B heavy out (55) is connected with washing device phosphoric acid import (40), and washing device phase splitting device B light phase export (56) is connected with back extraction device continuous phase fluid inlet (61);

4. as the described phosphoric acid purification device of one of claim 1-3, wherein: phase splitting device is phase-splitting groove or clarifying tank.

5. as the described phosphoric acid purification device of one of claim 1-3, wherein: mulser divides mulser for the pipeline high-shear.