CN113415791B - Device and method for recovering extractant in production of monopotassium phosphate by wet-process phosphoric acid extraction - Google Patents
Device and method for recovering extractant in production of monopotassium phosphate by wet-process phosphoric acid extraction Download PDFInfo
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- CN113415791B CN113415791B CN202110709414.1A CN202110709414A CN113415791B CN 113415791 B CN113415791 B CN 113415791B CN 202110709414 A CN202110709414 A CN 202110709414A CN 113415791 B CN113415791 B CN 113415791B
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- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/26—Phosphates
- C01B25/30—Alkali metal phosphates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D11/00—Solvent extraction
- B01D11/04—Solvent extraction of solutions which are liquid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D11/00—Solvent extraction
- B01D11/04—Solvent extraction of solutions which are liquid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D11/00—Solvent extraction
- B01D11/04—Solvent extraction of solutions which are liquid
- B01D11/0492—Applications, solvents used
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D25/00—Filters formed by clamping together several filtering elements or parts of such elements
- B01D25/12—Filter presses, i.e. of the plate or plate and frame type
- B01D25/21—Plate and frame presses
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Abstract
The invention discloses a device and a method for recovering an extractant in production of monopotassium phosphate by wet-process phosphoric acid extraction, and relates to the technical field of production of monopotassium phosphate by an extraction method. Collecting the extraction compound on the surface layer of the thickener by a floating recovery device, pumping the extraction compound into an extraction compound collecting tank by a submersible pump for primary back extraction, then discharging the extraction compound once after the extraction agent recovery tank is kept stand for phase splitting, adding the back extraction agent into the phase-split organic phase again for secondary back extraction, discharging the organic phase for secondary back extraction after the phase splitting is kept stand for phase splitting, and filtering the organic phase in a plate and frame filter press to produce potassium dihydrogen phosphate by an extraction method. The device is used for carrying out back extraction on the extraction compound to recover the extractant, the extractant is circularly used for production, the consumption of the extractant is reduced, and meanwhile, the granular impurities are prevented from entering an extraction system along with the recovered extractant. The secondary back extraction and secondary discharge are adopted, and the back extraction effect is better.
Description
Technical Field
The invention relates to the technical field of potassium dihydrogen phosphate production by an extraction method, in particular to a device and a method for recovering an extracting agent in potassium dihydrogen phosphate production by wet-process phosphoric acid extraction.
Background
The potassium dihydrogen phosphate is a high-efficiency and high-concentration compound fertilizer, and the phosphorus and the potassium can be absorbed by crops, have good solubility and are suitable for drip irrigation and spraying. The production method of the monopotassium phosphate mainly comprises a neutralization method, a direct method, an ion exchange method, a double decomposition method and an extraction method, wherein the extraction method is an advanced industrial production method with development prospect at present. Wet process phosphoric acid and potassium chloride are used as raw materials, an extractant and a solution are used for homogeneous reaction, and potassium dihydrogen phosphate is separated under the action of salting out and cooling conditions. Adding ammonia water into the extracted organic phase to regenerate an extractant, recycling the extractant, and performing extraction mainly by using a reaction (M is the extractant):
H 3 PO 4 +KCl+H 2 0+M (organic phase) = M · HCl (organic phase) + KH 2 PO 4 +H 2 0
The main reaction of the back extraction is (S is a back extractant):
M.HCl (organic phase) + NH 3 +H 2 0＝NH 4 Cl + M (organic phase) + H 2 0
After the extraction reaction is finished, the feed liquid enters a thickener for sedimentation separation, and the separated liquid is concentrated and crystallized to obtain a potassium dihydrogen phosphate product. A small amount of extraction compounds are carried in feed liquid after extraction reaction and enter the thickener, the surface extraction compounds float on the surface layer of the thickener after sedimentation separation, in order to ensure the quality of the monopotassium phosphate and avoid the influence of the extraction compounds on subsequent production, the extraction compounds on the inner surface layer of the thickener need to be cleaned when being gathered to a certain degree, on one hand, the extraction compounds are prevented from entering the process flow of the subsequent monopotassium phosphate production, and on the other hand, the extraction agent is recovered.
At present, the treatment method of the surface layer extract compound of the thickener is mainly to scrape the surface layer extract compound by a plate manually, and the surface layer extract compound is not recycled, thereby causing waste.
Disclosure of Invention
The invention aims to provide a device and a method for recovering an extracting agent in the production of monopotassium phosphate by wet-process phosphoric acid extraction, and solve the problem of waste caused by the fact that an extraction compound in a thickener is not recovered in the existing production.
In order to solve the technical problems, the invention adopts the following technical scheme: the utility model provides an extractant recovery unit in phosphoric acid by wet process extraction production potassium dihydrogen phosphate which characterized in that: the device comprises a floating type recovery device, an extract compound collecting tank, a first pump, an extractant recovery tank, a second pump, a plate-and-frame filter press and an extractant collecting ground tank which are connected in sequence; the floating type recovery device is a hollow shell with an opening at the top, a submersible pump is arranged in the shell, the floating type recovery device floats on the liquid level of the thickener, and the top of the floating type recovery device is lower than the liquid level; the extraction compound collecting tank is connected with a back extraction agent providing device, the top of the extraction agent recovery tank is connected with the back extraction agent providing device and a low-pressure steam providing device, and the bottom of the extraction agent recovery tank is connected with a water-phase slag slurry collecting ground tank.
A motor is arranged on the extractant recovery tank, an output shaft of the motor is connected with a stirring paddle, and the stirring paddle is positioned in the extractant recovery tank; a liquid level sight glass is arranged on the side wall of the extractant recovery tank.
The further technical proposal is that the stripping agent supply device comprises an ammonia absorber which is respectively connected with an ammonia water supply device and an ammonium chloride solution supply device.
A further technical scheme is that a fixed support is arranged above the thickener, an electric telescopic rod is movably arranged on the fixed support, and the end part of the electric telescopic rod is connected with the floating type recovery device.
The further technical scheme is that the method for recovering the extractant by using the extractant recovery device in the production of the monopotassium phosphate by the wet-process phosphoric acid extraction comprises the following specific steps:
s1, when the liquid level in the thickener is higher than 300mm, putting the thickener into a floating type recovery device, enabling the top of the floating type recovery device to be lower than the liquid level, and enabling the extraction compound on the surface layer of the liquid level to enter the floating type recovery device; starting a submersible pump to pump the extract compounds in the floating type recovery device into an extract compound collecting tank; when the liquid level of the extract compound collecting tank reaches 1m, closing the submersible pump;
s2, adding NH from an ammonia absorber 3 Adding 2-5% ammonium chloride solution into an extract compound collecting tank according to 1:1 for carrying out a back extraction reaction, starting a stirring paddle for uniformly stirring, reacting for 15-20 minutes, and pumping the solution obtained by the reaction into an extractant recovery tank through a first pump;
s3, standing for 5-10 minutes, and discharging the water-phase slag slurry into a water-phase slag slurry collecting ground tank through a bottom outlet; the remaining organic phase is continuously added with NH-containing gas from an ammonia absorber according to 1:1 3 Carrying out secondary back extraction reaction on 2-5% ammonium chloride solution at 40-60 ℃ for 5-20 min;
s4, standing and phase splitting after the reaction is finished, wherein the phase splitting time is 10-30 minutes, discharging the water phase into a water phase slag slurry collecting ground tank, conveying the organic phase into a plate-and-frame filter press for filter pressing through a second pump, and conveying the filtrate serving as an extractant into an extractant collecting ground tank for producing potassium dihydrogen phosphate by wet-process phosphoric acid extraction.
A further technical proposal is that before the plate-and-frame filter press is unloaded, 0.5 to 2m of extractant is added into an extractant recovery tank 3 And (3) pumping the diluent into a plate-and-frame filter press to wash the filter cake, and feeding the washing water into an extractant collecting ground tank.
The further technical scheme is that after the water phase entering the water phase slag slurry collecting ground tank is subjected to pressure filtration, the filtrate enters an ammonium chloride concentration procedure, and the filter cake is collected and treated.
Compared with the prior art, the invention has the beneficial effects that:
1. collecting the extraction compound on the surface layer of the thickener by a floating recovery device, pumping the extraction compound into an extraction compound collecting tank by a submersible pump for primary back extraction, then discharging the extraction compound once after the extraction agent recovery tank is kept stand for phase splitting, adding the back extraction agent into the phase-split organic phase again for secondary back extraction, discharging the organic phase for secondary back extraction after the phase splitting is kept stand for phase splitting, and filtering the organic phase in a plate and frame filter press to produce potassium dihydrogen phosphate by an extraction method. The device is used for carrying out back extraction on the extraction compound to recover the extractant, the extractant is circularly used for production, the consumption of the extractant is reduced, and meanwhile, the granular impurities are prevented from entering an extraction system along with the recovered extractant.
2. Observing the discharge condition in the extractant recovery tank through a liquid level sight glass, so as to avoid discharging an organic phase; accurately preparing a stripping agent through an ammonia absorber; the height of the floating recovery device in the liquid surface of the thickener is adjusted through an electric telescopic rod, so that the top of the floating recovery device is positioned 3-5 mm below the liquid surface, and the surface layer extract enters in a self-flowing manner; through adjusting electric telescopic handle's position, make floating recovery unit remove on the stiff ware surface, as far as possible collect and extract the compound.
3. Secondary back extraction and secondary discharge are adopted, so that the back extraction effect is better; after the extractant is filtered by the plate-and-frame filter press, the extraction system can avoid the particles from being carried out along with the recovery of the extractant; and the filter cake is washed by a diluent, so that the residual quantity of the extractant in the filter cake is reduced to the maximum extent.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
In the figure: 1-floating type recovery device, 2-extract compound collecting tank, 3-first pump, 4-extractant recovery tank, 5-second pump, 6-plate-and-frame filter press, 7-extractant collecting ground tank, 8-submersible pump, 9-thickener, 10-aqueous phase slag slurry collecting ground tank, 11-liquid level sight glass, 12-ammonia absorber, 13-fixed support and 14-electric telescopic rod.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 1 shows an extractant recovery device in potassium dihydrogen phosphate production by wet-process phosphoric acid extraction, which comprises a floating type recovery device 1, an extract collecting tank 2, a first pump 3, an extractant recovery tank 4, a second pump 5, a plate-and-frame filter press 6 and an extractant collecting ground tank 7 which are connected in sequence.
The floating recovery device 1 is a hollow shell with an opening at the top, and a submersible pump 8 is arranged in the shell. For convenience of installation, a fixed support 13 is arranged above the thickener 9, an electric telescopic rod 14 is movably arranged on the fixed support 13, the fixed support 13 can use a portal frame, and the electric telescopic rod 14 can move left and right on the fixed support 13. The end part of the electric telescopic rod 14 is connected with the floating type recovery device 1. The floating recovery device 1 floats on the liquid level of the thickener 9, the top of the floating recovery device 1 is controlled to be lower than the liquid level through the expansion and contraction of the electric telescopic rod 14, and the extracted compound can conveniently flow into the floating recovery device 1 automatically.
The extraction compound collecting tank 2 is connected with a back extraction agent providing device, the top of the extraction agent recovery tank 4 is connected with the back extraction agent providing device and a low-pressure steam providing device, and the bottom of the extraction agent recovery tank 4 is connected with a water phase slag slurry collecting ground tank 10. The stripping agent supply device comprises an ammonia absorber 12, the ammonia absorber 12 is respectively connected with an ammonia water supply device and an ammonium chloride solution supply device, and the stripping agent is accurately prepared through the ammonia absorber 12. The reaction temperature of the back extraction reaction in the extractant recovery tank 4 is controlled by low-pressure steam.
Motors are arranged on the extract compound collecting tank 2, the extractant recovery tank 4 and the thickener 9, and the output shafts of the motors are connected with stirring paddles which are positioned in the tank body. Wherein, a liquid level viewing mirror 11 is arranged on the side wall of the extractant recovery tank 4. The back-extracted extraction compound is kept stand in the extraction agent recovery tank 4 for phase splitting, the organic phase is used for extraction agent recovery, the water phase enters the water phase slag slurry collection ground tank 10 through a discharge outlet at the bottom of the extraction agent recovery tank 4, and observation and control are carried out through a liquid level sight glass 11 in order to avoid discharging the extraction agent in the organic phase.
Example 2
The extractant recovery device in the embodiment 1 is used for recovering the extractant in the potassium dihydrogen phosphate production by wet-process phosphoric acid extraction, and the method comprises the following specific steps:
s1, when the liquid level in the thickener 9 is 300mm, the floating recovery device 1 is placed, the top of the floating recovery device 1 is lower than the liquid level by 3mm, and the extract on the surface layer of the liquid level enters the floating recovery device 1. Starting a submersible pump 8 to pump the extract compounds in the floating type recovery device 1 into an extract compound collecting tank 2; when the liquid level of the extract collecting tank 2 reaches 1m, the submersible pump 8 is closed.
S2, NH contained in the ammonia suction device 12 3 And adding 2% ammonium chloride solution into the extraction compound collecting tank 2 according to 1:1 for carrying out a back extraction reaction, starting a stirring paddle to stir uniformly, reacting for 15 minutes, and pumping the solution obtained by the reaction into the extractant recovery tank 4 through the first pump 3.
S3, standing for 5 minutes, and discharging the water-phase slag slurry into a water-phase slag slurry collecting ground tank 10 through a bottom outlet; the remaining organic phase is continuously added with NH-containing gas from the ammonia absorber 12 according to 1:1 3 The secondary back extraction reaction is carried out by 2 percent ammonium chloride solution, the reaction temperature is 40 ℃, and the reaction time is 20 minutes. And (3) after the water phase entering the water phase slag slurry collecting ground tank 10 is subjected to filter pressing, the filtrate enters an ammonium chloride concentration process, and a filter cake is collected and treated.
S4, standing and phase splitting are carried out after the reaction is finished, the phase splitting time is 10 minutes, the water phase is discharged into a water phase slag slurry collecting ground tank 10, the organic phase is sent into a plate-and-frame filter press 6 through a second pump 5 to be subjected to filter pressing, and the filtrate is used as an extractant and is sent into an extractant collecting ground tank 7 to be used for producing potassium dihydrogen phosphate through wet-process phosphoric acid extraction. Before the plate-and-frame filter press 6 is unloaded, 0.5m of extractant is added into the extractant recovery tank 4 3 And (3) pumping a diluent into the plate-and-frame filter press 6 to wash the filter cake, and feeding the washing water into an extractant collecting ground tank 7. The diluent is kerosene.
Example 3
The extractant recovery device in the embodiment 1 is used for recovering the extractant in the potassium dihydrogen phosphate production by wet-process phosphoric acid extraction, and the method comprises the following specific steps:
s1, when the liquid level in the thickener 9 is 400mm, the floating type recovery device 1 is placed in, the top of the floating type recovery device 1 is lower than the liquid level by 5mm, and the extraction compound on the surface layer of the liquid level enters the floating type recovery device 1. Starting a submersible pump 8 to pump the extract compounds in the floating type recovery device 1 into an extract compound collecting tank 2; when the liquid level of the extract collecting tank 2 reaches 1m, the submersible pump 8 is closed.
S2, NH contained in the ammonia suction device 12 3 And adding 4% ammonium chloride solution into the extraction compound collecting tank 2 according to 1:1 for carrying out a back extraction reaction, starting a stirring paddle for uniformly stirring, and pumping the solution obtained by the reaction into the extractant recovering tank 4 through the first pump 3 after the reaction is carried out for 18 minutes.
S3, standing for 5 minutes, and discharging the water-phase slag slurry into a water-phase slag slurry collecting ground tank 10 through a bottom outlet; the remaining organic phase is continuously added with NH-containing gas from the ammonia absorber 12 according to 1:1 3 The ammonium chloride solution with the amount of 4 percent is subjected to secondary back extraction reaction at the reaction temperature of 50 ℃ for 10 minutes. And (3) after the water phase entering the water phase slag slurry collecting ground tank 10 is subjected to pressure filtration, the filtrate enters an ammonium chloride concentration process, and the filter cake is collected and treated.
S4, standing and phase splitting after the reaction is finished, wherein the phase splitting time is 20 minutes, discharging the water phase into a water phase slag slurry collecting ground tank 10, sending the organic phase into a plate-and-frame filter press 6 for filter pressing through a second pump 5, and sending the filtrate serving as an extractant into an extractant collecting ground tank 7 for producing potassium dihydrogen phosphate by wet-process phosphoric acid extraction. Before the plate and frame filter press 6 is unloaded, 1.2m of extractant is added into an extractant recovery tank 4 3 And (3) pumping a diluent into the plate-and-frame filter press 6 to wash the filter cake, and feeding the washing water into an extractant collecting ground tank 7. The diluent is kerosene.
Example 4
The extractant recovery device in the embodiment 1 is used for recovering the extractant in the potassium dihydrogen phosphate production by wet-process phosphoric acid extraction, and the method comprises the following specific steps:
s1, when the liquid level in the thickener 9 is 500mm, the floating recovery device 1 is placed, the top of the floating recovery device 1 is lower than the liquid level by 5mm, and the extract on the surface layer of the liquid level enters the floating recovery device 1. Starting a submersible pump 8 to pump the extract compounds in the floating type recovery device 1 into an extract compound collecting tank 2; when the liquid level of the extract collecting tank 2 reaches 1m, the submersible pump 8 is closed.
S2. NH content from suction ammonia 12 3 5% ammonium chloride solution is added as 1:1And (3) performing a back extraction reaction in the extraction compound collecting tank 2, starting a stirring paddle, uniformly stirring, reacting for 20 minutes, and pumping the solution obtained by the reaction into the extractant recycling tank 4 through the first pump 3.
S3, standing for 5 minutes, and discharging the water-phase slag slurry into a water-phase slag slurry collecting ground tank 10 through a bottom outlet; the remaining organic phase is continuously added with NH-containing gas from the ammonia absorber 12 according to 1:1 3 The secondary back extraction reaction is carried out by 5 percent ammonium chloride solution, the reaction temperature is 60 ℃, and the reaction time is 10 minutes. And (3) after the water phase entering the water phase slag slurry collecting ground tank 10 is subjected to pressure filtration, the filtrate enters an ammonium chloride concentration process, and the filter cake is collected and treated.
S4, standing and phase splitting are carried out after the reaction is finished, the phase splitting time is 30 minutes, the water phase is discharged into a water phase slag slurry collecting ground tank 10, the organic phase is sent into a plate-and-frame filter press 6 through a second pump 5 to be subjected to filter pressing, and the filtrate is used as an extractant and is sent into an extractant collecting ground tank 7 to be used for producing potassium dihydrogen phosphate through wet-process phosphoric acid extraction. Before the plate and frame filter press 6 is unloaded, 1.8m of extractant is added into an extractant recovery tank 4 3 And (3) pumping a diluent into the plate-and-frame filter press 6 to wash the filter cake, and feeding the washing water into an extractant collecting ground tank 7. The diluent is kerosene.
Although the invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More particularly, various variations and modifications are possible in the component parts and/or arrangements within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.
Claims (5)
1. The utility model provides an extractant recovery unit in wet process phosphoric acid extraction production potassium dihydrogen phosphate which characterized in that: comprises a floating type recovery device (1), an extract collecting tank (2), a first pump (3), an extractant recovery tank (4), a second pump (5), a plate-and-frame filter press (6) and an extractant collecting ground tank (7) which are connected in sequence; the floating type recovery device (1) is a hollow shell with an opening at the top, a submersible pump (8) is arranged in the shell, the floating type recovery device (1) floats on the liquid level of the thickener (9), and the top of the floating type recovery device (1) is lower than the liquid level; the extraction compound collecting tank (2) is connected with a back extraction agent supply device, the top of the extraction agent recovery tank (4) is connected with the back extraction agent supply device and a low-pressure steam supply device, and the bottom of the extraction agent recovery tank (4) is connected with a water phase slag slurry collecting ground tank (10); a fixed support (13) is arranged above the thickener (9), an electric telescopic rod (14) is movably arranged on the fixed support (13), the end part of the electric telescopic rod (14) is connected with the floating type recovery device (1), the fixed support (13) is a portal frame, and the electric telescopic rod (14) moves front and back, left and right on the fixed support (13); a motor is arranged on the extract compound collecting tank (2), and an output shaft of the motor is connected with a stirring paddle which is positioned in the tank body; a motor is arranged on the extractant recovery tank (4), and an output shaft of the motor is connected with a stirring paddle which is positioned in the extractant recovery tank (4); the stripping agent supply device comprises an ammonia absorber (12), and the ammonia absorber (12) is respectively connected with an ammonia water supply device and an ammonium chloride solution supply device.
2. The extraction agent recovery device in the production of monopotassium phosphate by wet-process phosphoric acid extraction according to claim 1, characterized in that: and a liquid level viewing mirror (11) is arranged on the side wall of the extractant recovery tank (4).
3. A method for recovering an extracting agent in the production of monopotassium phosphate by wet-process phosphoric acid extraction is characterized by comprising the following steps: the recovery device of the extractant in the production of potassium dihydrogen phosphate by wet-process phosphoric acid extraction as claimed in claim 1 or 2 comprises the following steps:
s1, when the liquid level in the thickener (9) is higher than 300mm, putting the thickener into a floating type recovery device (1), making the top of the floating type recovery device (1) lower than the liquid level, and making the extraction compound on the surface layer of the liquid level enter the floating type recovery device (1); starting a submersible pump (8) to pump the extract compounds in the floating type recovery device (1) into an extract compound collecting tank (2); when the liquid level of the extract compound collecting tank (2) reaches 1m, closing the submersible pump (8);
s2, NH contained in the ammonia gas from the ammonia absorber (12) 3 Adding 2-5% ammonium chloride solution into the extract compound collecting tank (2) according to 1:1 for carrying out a back extraction reaction, starting a stirring paddle to stir uniformly, and pumping the solution obtained by the reaction into an extractant recovery tank (4) through a first pump (3) after reacting for 15-20 minutes;
s3, standing for 5-10 minutes, and discharging the water-phase slag slurry into a water-phase slag slurry collecting ground tank (10) through a bottom outlet; the remaining organic phase is continuously added with NH-containing gas from the ammonia absorber (12) according to 1:1 3 Carrying out secondary back extraction reaction on 2-5% ammonium chloride solution at 40-60 ℃ for 5-20 min;
s4, standing and phase splitting are carried out after the reaction is finished, the phase splitting time is 10-30 minutes, the water phase is discharged into a water phase slag slurry collecting ground tank (10), the organic phase is sent into a plate-and-frame filter press (6) through a second pump (5) for filter pressing, and the filtrate is used as an extractant and sent into an extractant collecting ground tank (7) for producing potassium dihydrogen phosphate through wet-process phosphoric acid extraction.
4. The method for recovering the extractant in the production of monopotassium phosphate by wet-process phosphoric acid extraction according to claim 3, characterized by comprising the following steps: before the plate-and-frame filter press (6) is unloaded, 0.5-2 m of extractant is added into the extractant recovery tank (4) 3 And (3) pumping a diluent into a plate-and-frame filter press (6) to wash the filter cake, and feeding the washing water into an extractant collecting ground tank (7).
5. The method for recovering the extractant in the production of the monopotassium phosphate by the wet-process phosphoric acid extraction, which is characterized by comprising the following steps of: and (3) after the water phase entering the water phase slag slurry collecting ground tank (10) is subjected to pressure filtration, the filtrate enters an ammonium chloride concentration process, and the filter cake is collected and treated.
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| CN1898155A (en) * | 2003-12-24 | 2007-01-17 | 艾克菲斯公司 | Method for producing strong base phosphates |
| CN103069022A (en) * | 2010-07-09 | 2013-04-24 | 浦项产业科学研究院 | Method for economical extraction of lithium from solution including lithium |
| CN106586990A (en) * | 2016-11-09 | 2017-04-26 | 中化重庆涪陵化工有限公司 | Method of using phosphoric acid by wet process to produce monopotassium phosphate |
| CN108609592A (en) * | 2018-07-04 | 2018-10-02 | 中化重庆涪陵化工有限公司 | The method of Purification of Wet process Phosphoric Acid by Solvent Extraction coproduction potassium dihydrogen phosphate |
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