CN201882910U - Phosphoric acid purifying device - Google Patents

Abstract

The utility model discloses a phosphoric acid purifying device comprising an extraction device, a washing device and a back extraction device, wherein the extraction device and the washing device select a single stage formed by a group of mixers and a phase splitting device, or a multistage formed by a plurality of groups of mixers and phase splitting devices, and the back extraction device selects a pulse tower to be taken as a mass transferring device. A continuous phase fluid inlet of the extraction device is connected with a light phase outlet of a back extraction tower, a continuous phase fluid inlet of the washing device is connected a final-stage light phase outlet of the extraction device, and a light phase inlet of the back extraction tower is connected with a final-stage light phase outlet of the washing device. According to the phosphoric acid purifying device, the mass transferring performance can be strengthened, the purifying efficiency is improved, the investment and the running cost of the equipment are lowered, and the occupied area is small.

Description

Phosphoric acid purification device

Technical field

The utility model relates to the 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 mixing tank 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; 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 CN1736577A, disclosed on 02 22nd, 2006 " a kind of multi-channeled micro-structured reactor ", continuous phase fluid enters reactor from the inlet pipe 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.

Is advanced at present phosphoric acid purification technology with pulse-column as the solvent extraction technology of mass transfer apparatus, and pulse-column mass-transfer efficiency height can be produced high-quality purifying phosphoric acid.But this equipment making expense is higher, and for preventing to reveal, its tower body is generally moulded, the internal cleaning difficulty.In the phosphoric acid extraction process, phosphoric acid contacts with organic solvent anti-phase in extraction tower, and the partial impurities in the phosphoric acid separates out with sedimentary form.Wherein partly precipitated is along with raffinate is discharged outside the tower, and some precipitates and forms the tower dirt on attached long-pending tower wall and the column plate.Along with the lengthening of time, the tower dirt is cumulative, and structure is more and more finer and close.When the tower dirt was accumulated to certain degree, the tower interior passageway stopped up serious, and the Flow of Goods and Materials and the way of contact are changed in the tower, have a strong impact on effect of extracting.Because of tower dirt component complexity, compact structure will be replaced the obnoxious flavour in the tower during with artificial the cleaning, and it is big to clean difficulty, and the time is long and can not clean the dirty piece at tower body middle part.

In the back extraction process, considerably less because of the material foreign matter content, the tower dirt amount of generation does not seldom cause detrimentally affect to production substantially.

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 the phosphoric acid purification device of facility investment and working cost.

A kind of phosphoric acid purification device of the present utility model, comprise extraction plant, washing device and back extraction device, wherein: the extraction plant light phase export is connected with the import of washing device continuous phase fluid, the washing device light phase export connects with the light import mutually of back extraction tower, and the back extraction device light phase export is connected with the import of extraction plant continuous phase fluid;

Extraction plant comprises extraction plant mixing tank and extraction plant phase splitting device, the extraction plant mixing tank is provided with the import of extraction plant continuous phase fluid, the import of extraction plant dispersed phase fluid 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;

Washing device comprises washing device mixing tank and washing device phase splitting device, the washing device mixing tank is provided with the import of washing device continuous phase fluid, the import of washing device dispersed phase fluid and the outlet of washing device mixed phase fluid, the washing device phase splitting device is provided with the import of washing device mixed phase, washing device heavy out and washing device light phase export, and the outlet of washing device mixed phase fluid is connected with the import of washing device mixed phase;

Back extraction device is the back extraction tower, and the back extraction tower is provided with the light phase import of back extraction tower, the import of back extraction tower de-salted water, back extraction tower light phase export, back extraction tower back extraction acid outlet.

Above-mentioned phosphoric acid purification device, it is characterized in that: extraction plant comprises extraction plant secondary mixing tank and extraction plant secondary phase splitting device, extraction plant secondary mixing tank is provided with the import of extraction plant secondary continuous phase fluid, the dispersed phase fluid import of extraction plant secondary 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 the import of extraction plant secondary continuous phase fluid, and extraction plant secondary heavy out is connected with the import of extraction plant dispersed phase fluid, and extraction plant secondary light phase export is connected with the import of washing device continuous phase fluid;

Washing device comprises washing device secondary mixing tank and washing device secondary phase splitting device, washing device secondary mixing tank is provided with the import of washing device secondary continuous phase fluid, the dispersed phase fluid import of washing device secondary and the outlet of washing device secondary mixed phase fluid, washing device secondary phase splitting device is provided with the import of washing device secondary mixed phase, washing device secondary heavy out and washing device secondary light phase export, and the outlet of washing device mixed phase second grade fluid is connected with the import of washing device secondary mixed phase; The washing device light phase export is connected with the import of washing device secondary continuous phase fluid, and washing device secondary heavy out is connected with the import of washing device dispersed phase fluid, and washing device secondary light phase export connects with the light import mutually of back extraction device;

Back extraction device comprises the back extraction tower, and the back extraction tower is provided with the light phase import of back extraction tower, the import of back extraction tower de-salted water, back extraction tower light phase export, back extraction tower back extraction acid outlet.

Above-mentioned phosphoric acid purification device, it is characterized in that: 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 three grades of continuous phase fluid imports of extraction plant, extraction plant disperses phase fluid import and three grades of mixed phase fluid outlets of extraction plant for three grades, 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 imports of extraction plant secondary light phase export and extraction plant are connected, and three grades of heavy outs of extraction plant are connected with the import of extraction plant secondary dispersed phase fluid, and three grades of light phase exports of extraction plant are connected with the import of washing device continuous phase fluid;

Washing device comprises three grades of mixing tanks of washing device and three grades of phase-splitting equipment of washing device, three grades of mixing tanks of washing device are provided with three grades of continuous phase fluid imports of washing device, washing device disperses phase fluid import and three grades of mixed phase fluid outlets of washing device for three grades, three grades of phase-splitting equipment of washing device are provided with three grades of mixed phase imports of washing device, three grades of heavy outs of washing device and three grades of light phase exports of washing device, and three grades of mixed phase fluid outlets of washing device are connected with three grades of mixed phase imports of washing device; Three grades of continuous phase fluid imports of washing device secondary light phase export and washing device are connected, and three grades of heavy outs of washing device are connected with the import of washing device secondary dispersed phase fluid, and three grades of light phase exports of washing device connect with the light import mutually of back extraction device;

Back extraction device comprises the back extraction tower, and the back extraction tower is provided with the light phase import of back extraction tower, the import of back extraction tower de-salted water, back extraction tower light phase export, back extraction tower back extraction acid outlet.

The utility model compared with prior art, as can be known from the above technical solutions, different according to purify requiring, constitute in the phosphoric acid purification device, extraction plant, washing device select for use single-stage that one group of mixing tank and phase splitting device constitute or by multiple mixer and phase splitting device combine multistage; Back extraction device selects for use pulse-column as mass transfer apparatus.In the phosphoric acid purification process, feed phosphoric acid (fresh phosphoric), washing acid (purifying phosphoric acid) are added by the import of extraction plant final stage dispersed phase fluid, the import of washing device final stage dispersed phase fluid respectively, and de-salted water is added by the import of back extraction tower de-salted water.The no-load solvent of extraction plant continuous phase fluid import is from back extraction tower light phase export, and the loaded solvent of washing device continuous phase fluid import is from extraction plant final stage light phase export, and the loaded solvent of the light phase import of back extraction tower is from washing device final stage light phase export.Because the mixing tank mass transfer area is big, the mass-transfer efficiency height.The mixed solution that comes out from mixing tank is easy to phase-splitting, thereby guarantees 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) to leak in a large number and the peace ring accident that causes; The mixing tank floor space is little, and appliance arrangement is arranged simple, and factory building can be realized miniaturization; The mixing tank cost is low, can save facility investment.

Description of drawings

Fig. 1 is the single step arrangement synoptic diagram of utility model;

Fig. 2 is the secondary structure synoptic diagram of utility model;

Fig. 3 is the tertiary structure synoptic diagram of utility model.

Mark among the figure:

1, the extraction plant mixing tank, 2, the extraction plant phase splitting device, 3, the import of extraction plant continuous phase fluid, 4, the import of extraction plant dispersed phase fluid, 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, the import of extraction plant secondary continuous phase fluid, 12, the import of extraction plant secondary dispersed phase fluid, 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 imports of extraction plant, 20, extraction plant disperses the phase fluid import 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 outs of extraction plant, 25, the washing device mixing tank, 26, the washing device phase splitting device, 27, the import of washing device continuous phase fluid, 28, the import of washing device dispersed phase fluid, 29, the outlet of washing device mixed phase fluid, 30, the import of washing device mixed phase, 31, the washing device light phase export, 32, the washing device heavy out, 33, washing device secondary mixing tank, 34, washing device secondary phase splitting device, 35, the import of washing device secondary continuous phase fluid, 36, the import of washing device secondary dispersed phase fluid, 37, the outlet of washing device secondary mixed phase fluid, 38, the import of washing device secondary mixed phase, 39, washing device secondary light phase export, 40, washing device secondary heavy out, 41, three grades of mixing tanks of washing device, 42, three grades of phase-splitting equipment of washing device, 43, three grades of continuous phase fluid imports of washing device, 44, washing device disperses the phase fluid import for three grades, 45, three grades of mixed phase fluid outlets of washing device, 46, three grades of mixed phase imports of washing device, 47, three grades of light phase exports of washing device, 48, three grades of heavy outs of washing device, 49, the back extraction tower, 50, the import of back extraction tower de-salted water, 51, the light phase import of back extraction tower, 52, back extraction tower light phase export, 53, back extraction tower back extraction acid outlet.

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 single-stage extraction device, washing device and back extraction device, wherein: extraction plant light phase export 7 is connected with washing device continuous phase fluid import 27, washing device light phase export 31 connects with the light import mutually 51 of back extraction tower, and back extraction tower light phase export 52 is connected with extraction plant continuous phase fluid import 3;

Extraction plant comprises extraction plant mixing tank 1 and extraction plant phase splitting device 2, extraction plant mixing tank 1 is provided with extraction plant continuous phase fluid import 3, extraction plant dispersed phase fluid import 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;

Washing device comprises washing device mixing tank 25 and washing device phase splitting device 26, washing device mixing tank 25 is provided with washing device continuous phase fluid import 27, washing device dispersed phase fluid import 28 and washing device mixed phase fluid outlet 29, washing device phase splitting device 26 is provided with washing device mixed phase import 30, washing device heavy out 32 and washing device light phase export 31, and washing device mixed phase fluid outlet 29 is connected with washing device mixed phase import 30;

Back extraction device comprises back extraction tower 49, and back extraction tower 49 is provided with the light phase import 51 of back extraction tower, back extraction tower de-salted water import 50, back extraction tower light phase export 52, back extraction tower back extraction acid outlet 53.

During use, at extraction plant, phosphoric acid enters mixing tank 1 from extraction plant dispersed phase fluid import 4, extraction agent (from the no-load solvent of back extraction tower light phase export 52) from extraction plant continuous phase fluid import 3, extraction agent and phosphoric acid are finished the efficient mass transfer process in 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 phase splitting device mixed phase import 6.In extraction plant phase splitting device 2, realize the layering of mixed phase, light, the heavy two-phase of formation.Phosphoric acid is extracted agent extraction to be become loaded solvent and enters washing device from extraction plant light phase export 7, and the impurity in the phosphoric acid enters heavy phase to be become raffinate and discharge from extraction plant heavy out 8, thereby realizes extracting and separating.

At washing device, purifying phosphoric acid enters washing device mixing tank 25 from washing device dispersed phase fluid import 28, the loaded solvent that comes from extraction plant from washing device continuous phase fluid import 27, loaded solvent and phosphoric acid are finished the efficient mass transfer process in washing device mixing tank 25, the mixed phase that forms comes out from washing device mixed phase fluid outlet 29, enters washing device phase splitting device 26 by washing device phase splitting device mixed phase import 30.In washing device phase splitting device 26, realize the layering of mixed phase, light, the heavy two-phase that forms, impurity in the loaded solvent enters heavy phase to be become and washes spent acid and discharge from washing device heavy out 32, be washed the loaded solvent that has purified and enter the back extraction tower, thereby realize washing, purifying from washing device light phase export 31.

At back extraction device, the loaded solvent that comes out from washing device washing tower light phase export enters the light phase import 51 of back extraction device back extraction tower, and de-salted water adds from back extraction device back extraction tower de-salted water import 50, and de-salted water contacts with loaded solvent anti-phase in tower, fully mass transfer.Phosphoric acid in the loaded solvent enters heavy phase and sinks to down the clarifying chamber, in following clarifying chamber, leave standstill phase-splitting after back extraction acid discharge outside the towers from back extraction tower back extraction acid outlet 53.Be desalted loaded solvent after the water back extraction and become no-load solvent and rise to the clarifying chamber, return extraction plant from back extraction tower light phase export 52 at last.Realize the recycle of extraction agent.

Embodiment 2

Referring to Fig. 2, the extraction of employing secondary, the phosphoric acid purification device of washing and back extraction device, extraction plant comprises extraction plant secondary mixing tank 9 and extraction plant secondary phase splitting device 10, extraction plant secondary mixing tank 9 is provided with extraction plant secondary continuous phase fluid import 11, extraction plant secondary dispersed phase fluid import 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, extraction plant secondary mixed phase fluid outlet 13 are connected with extraction plant secondary mixed phase import 14; Extraction plant light phase export 7 is connected with extraction plant secondary continuous phase fluid import 11, and extraction plant secondary heavy out 16 is connected with extraction plant dispersed phase fluid import 4, and extraction plant secondary light phase export 15 is connected with washing device continuous phase fluid import 27;

Washing device comprises washing device secondary mixing tank 33 and washing device secondary phase splitting device 34, washing device secondary mixing tank 33 is provided with washing device secondary continuous phase fluid import 35, washing device secondary dispersed phase fluid import 36 and washing device secondary mixed phase fluid outlet 37, washing device secondary phase splitting device 34 is provided with washing device secondary mixed phase import 38, washing device secondary heavy out 40 and washing device secondary light phase export 39, and washing device mixed phase second grade fluid outlet 37 is connected with washing device secondary mixed phase import 38; Washing device light phase export 31 is connected with washing device secondary continuous phase fluid import 35, and washing device secondary heavy out 40 is connected with washing device dispersed phase fluid import 28, and washing device secondary light phase export 39 connects with the light import mutually 51 of back extraction device;

Back extraction device such as embodiment 1.

During use, the phosphoric acid that extraction plant secondary heavy out 16 comes out, under the effect of pump, return extraction plant dispersed phase fluid import 4, extraction agent (from the no-load solvent of back extraction tower light phase export 52) enters extraction plant mixing tank 1 from extraction plant continuous phase fluid import 3, extraction agent 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 phase splitting device 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 extracted agent extraction to be become loaded solvent and comes out from extraction plant light phase export 7, enters extraction plant secondary mixing tank 9 through extraction plant secondary continuous phase fluid import 11 under the effect of pump.Feed phosphoric acid (fresh phosphoric) enters extraction plant secondary mixing tank 9 through extraction plant secondary dispersed phase fluid import 12, efficient mass transfer effect by extraction plant secondary mixing tank 9, further improve the phosphoric acid extraction rate, 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, most of phosphoric acid is extracted the agent extraction and enters and gently form loaded solvent mutually and enter washing device from extraction plant secondary light phase export 15, heavy phase is then returned extraction plant mixing tank 1 by extraction plant heavy out 16, thereby realizes extracting and separating.

At washing device, the phosphoric acid that washing device secondary heavy out 40 comes out, the loaded solvent that return washing device dispersed phase fluid import 28 under the effect of pump, comes from extraction plant enters washing device mixing tank 25 from washing device continuous phase fluid import 27, loaded solvent and phosphoric acid are finished the efficient mass transfer process in washing device mixing tank 25, the mixed phase that forms comes out from washing device mixed phase fluid outlet 29, enters washing device phase splitting device 26 by washing device phase splitting device mixed phase import 30.In washing device phase splitting device 26, 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 heavy out 32, be washed the loaded solvent that has purified and come out, under the effect of pump, enter washing device secondary mixing tank 33 through washing device secondary continuous phase fluid import 35 from washing device light phase export 31.Washing acid (purifying phosphoric acid) enters washing device secondary mixing tank 33 through washing device secondary dispersed phase fluid import 36, efficient mass transfer effect by washing device secondary mixing tank 33, further improve the molten washing effect of load, the mixed phase that forms comes out from washing device secondary mixed phase fluid outlet 37, enter washing device secondary phase splitting device 34 by washing device secondary phase splitting device mixed phase import 38, in washing device secondary phase splitting device 34, realize the layering of mixed phase, what form is light, heavy two-phase, be washed the loaded solvent that has purified and enter the back extraction tower from washing device secondary light phase export 39, impurity in the loaded solvent enters heavy phase and returns washing device mixing tank 25 by washing device heavy out 40, thereby realizes washing, purifying.

Back extraction device such as embodiment 1.

Embodiment 3

Referring to Fig. 3, adopt three grades of extractions, the phosphoric acid purification device of washing and back extraction device, 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 imports 19 of extraction plant, extraction plant disperses phase fluid import 20 and three grades of mixed phase fluid outlets 21 of extraction plant for three grades, 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 imports 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 import 12, and three grades of light phase exports 23 of extraction plant are connected with washing device continuous phase fluid import 27;

Washing device comprises three grades of mixing tanks 41 of washing device and three grades of phase-splitting equipment 42 of washing device, three grades of mixing tanks 41 of washing device are provided with three grades of continuous phase fluid imports 43 of washing device, washing device disperses phase fluid import 44 and three grades of mixed phase fluid outlets 45 of washing device for three grades, three grades of phase-splitting equipment 42 of washing device are provided with three grades of mixed phase imports 46 of washing device, three grades of heavy outs 48 of washing device and three grades of light phase exports 47 of washing device, and three grades of mixed phase fluid of washing device outlet 45 is connected with three grades of mixed phase imports 46 of washing device; Three grades of continuous phase fluid imports 43 of washing device secondary light phase export 39 and washing device are connected, three grades of heavy outs 48 of washing device are connected with washing device secondary dispersed phase fluid import 36, and three grades of light phase exports 47 of washing device connect with the light import mutually 51 of back extraction tower;

Back extraction device such as embodiment 1.

During use, the phosphoric acid that extraction plant secondary extraction plant heavy out 16 comes out, under the effect of pump, return extraction plant dispersed phase fluid import 4, extraction agent (from the no-load solvent of back extraction tower light phase export 52) enters extraction plant mixing tank 1 from extraction plant continuous phase fluid import 3, extraction agent 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 phase splitting device 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 extracted agent extraction to be become loaded solvent and comes out from extraction plant light phase export 7, enters extraction plant secondary mixing tank 9 through extraction plant secondary continuous phase fluid import 11 under the effect of pump.The phosphoric acid that three grades of heavy outs 24 of extraction plant come out, under the effect of pump, return extraction plant secondary mixing tank 9, loaded solvent and phosphoric acid enter extraction plant phase splitting device 10 finish mass transfer in extraction plant secondary mixing tank 9 after, after extraction plant phase splitting device 10 is realized phase-splitting, heavy phase is returned extraction plant mixing tank 1 from extraction plant heavy out 16, loaded solvent comes out from extraction plant secondary light phase export 15, under the effect of pump through three grades of continuous phase fluid imports 19 of extraction plant, feed phosphoric acid (fresh phosphoric) disperses phase fluid import 20 to enter three grades of mixing tanks 17 of extraction plant through three grades of extraction plants, efficient mass transfer effect by multi-level mixer has improved the phosphoric acid extraction rate 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 phase-splitting equipment of extraction plant mixed phase import 22, in three grades of phase-splitting equipment 18 of extraction plant, realize the layering of mixed phase, light, the heavy two-phase that forms, most of phosphoric acid is extracted the agent extraction and enters and gently form loaded solvent mutually and come out to enter washing device from three grades of light phase exports of extraction plant 23, heavy phase is then returned extraction plant secondary mixing tank 9 by three grades of heavy outs 24 of extraction plant, thereby realizes extracting and separating.

At washing device, the phosphoric acid that washing device secondary heavy out 40 comes out, under the effect of pump, return washing device dispersed phase fluid import 28, enter washing device mixing tank 25 from washing device continuous phase fluid import 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 25, the mixed phase that forms comes out from washing device mixed phase fluid outlet 29, enters washing device phase splitting device 26 by washing device phase splitting device mixed phase import 30.In washing device phase splitting device 26, 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 heavy out 32, be washed the loaded solvent that has purified and come out, under the effect of pump, enter washing device secondary mixing tank 33 through washing device secondary continuous phase fluid import 35 from washing device light phase export 31.The phosphoric acid that comes out from three grades of heavy outs 48 of washing device returns washing device secondary dispersed phase fluid import 36, effect of mass transmitting by washing device secondary mixing tank 33, the mixed phase that forms comes out from washing device secondary mixed phase fluid outlet 37, enter washing device secondary phase splitting device 34 by washing device secondary phase splitting device mixed phase import 38, in washing device secondary phase splitting device 34, realize the layering of mixed phase, what form is light, heavy two-phase, loaded solvent comes out from washing device secondary light phase export 39, enters three grades of mixing tanks 41 of washing device through three grades of continuous phase fluid imports 43 of washing device under the effect of pump.Washing acid (purifying phosphoric acid) disperses phase fluid import 44 to enter three grades of mixing tanks 41 of washing device through three grades of washing devices, and the efficient mass transfer effect by multistage washing device mixing tank has improved the phosphoric acid washing effect as much as possible; The mixed phase that forms comes out from three grades of mixed phase fluid outlets 45 of washing device, enter three grades of phase-splitting equipment 42 of washing device by three grades of phase-splitting equipment of washing device mixed phase import 46, in three grades of phase-splitting equipment 42 of washing device, realize the layering of mixed phase, light, the heavy two-phase that forms, be washed the loaded solvent that has purified and come out to enter back extraction tower preface from three grades of light phase exports of washing device 47, the impurity in the loaded solvent enters heavy phase and returns washing device secondary mixing tank 33 by three grades of heavy outs 48 of washing device.By three grades of washings, the impurity major part in the loaded solvent is entered heavy phase by phosphoric acid washing finally to be become and washes spent acid and discharge from washing device phase splitting device heavy out 32, thereby realizes washing, purifying.

Back extraction device such as embodiment 1.

More than among three embodiment: mixing tank adopts Chinese patent publication number CN1736577A, open day: on 02 22nd, 2006, disclosed " a kind of multi-channeled micro-structured reactor ".

Claims (3)

1. phosphoric acid purification device, comprise extraction plant, washing device and back extraction device, it is characterized in that: extraction plant light phase export (7) is connected with washing device continuous phase fluid import (27), washing device light phase export (31) connects with the light import mutually of back extraction tower (51), and back extraction tower light phase export (52) is connected with extraction plant continuous phase fluid import (3);

Extraction plant comprises extraction plant mixing tank (1) and extraction plant phase splitting device (2), extraction plant mixing tank (1) is provided with extraction plant continuous phase fluid import (3), extraction plant dispersed phase fluid import (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);

Washing device comprises washing device mixing tank (25) and washing device phase splitting device (26), washing device mixing tank (25) is provided with washing device continuous phase fluid import (27), washing device dispersed phase fluid import (28) and washing device mixed phase fluid outlet (29), washing device phase splitting device (26) is provided with washing device mixed phase import (30), washing device heavy out (32) and washing device light phase export (31), and washing device mixed phase fluid outlet (29) is connected with washing device mixed phase import (30);

Back extraction device is back extraction tower (49), and back extraction tower (49) is provided with the light phase import of back extraction tower (51), back extraction tower de-salted water import (50), back extraction tower light phase export (52), back extraction tower back extraction acid outlet (53).

2. phosphoric acid purification device as claimed in claim 1, it is characterized in that: extraction plant comprises extraction plant secondary mixing tank (9) and extraction plant secondary phase splitting device (10), extraction plant secondary mixing tank (9) is provided with extraction plant secondary continuous phase fluid import (11), extraction plant secondary dispersed phase fluid import (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), 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 import (11), extraction plant secondary heavy out (16) is connected with extraction plant dispersed phase fluid import (4), and extraction plant secondary light phase export (15) is connected with washing device continuous phase fluid import (27);

Washing device comprises washing device secondary mixing tank (33) and washing device secondary phase splitting device (34), washing device secondary mixing tank (33) is provided with washing device secondary continuous phase fluid import (35), washing device secondary dispersed phase fluid import (36) and washing device secondary mixed phase fluid outlet (37), washing device secondary phase splitting device (34) is provided with washing device secondary mixed phase import (38), washing device secondary heavy out (40) and washing device secondary light phase export (39), washing device mixed phase second grade fluid outlet (37) is connected with washing device secondary mixed phase import (38); Washing device light phase export (31) is connected with washing device secondary continuous phase fluid import (35), washing device secondary heavy out (40) is connected with washing device dispersed phase fluid import (28), and washing device secondary light phase export (39) connects with the light import mutually of back extraction tower (51).

3. phosphoric acid purification device as claimed in claim 2, 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 imports of extraction plant (19), extraction plant disperses phase fluid import (20) and three grades of mixed phase fluid outlets of extraction plant (21) for three grades, 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 imports of extraction plant (19), three grades of heavy outs of extraction plant (24) are connected with extraction plant secondary dispersed phase fluid import (12), and three grades of light phase exports of extraction plant (23) are connected with washing device continuous phase fluid import (27);

Washing device comprises three grades of mixing tanks of washing device (41) and three grades of phase-splitting equipment of washing device (42), three grades of mixing tanks of washing device (41) are provided with three grades of continuous phase fluid imports of washing device (43), washing device disperses phase fluid import (44) and three grades of mixed phase fluid outlets of washing device (45) for three grades, three grades of phase-splitting equipment of washing device (42) are provided with three grades of mixed phase imports of washing device (46), three grades of light phase exports of three grades of heavy outs of washing device (48) and washing device (47), three grades of mixed phase fluid outlets of washing device (45) are connected with three grades of mixed phase imports of washing device (46); Washing device secondary light phase export (39) is connected with three grades of continuous phase fluid imports of washing device (43), three grades of heavy outs of washing device (48) are connected with washing device secondary dispersed phase fluid import (36), and three grades of light phase exports of washing device (47) connect with the light import mutually of back extraction tower (51).

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