CN219297154U - System for be used for purifying fertilizer level wet process phosphoric acid - Google Patents
System for be used for purifying fertilizer level wet process phosphoric acid Download PDFInfo
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- CN219297154U CN219297154U CN202320787316.4U CN202320787316U CN219297154U CN 219297154 U CN219297154 U CN 219297154U CN 202320787316 U CN202320787316 U CN 202320787316U CN 219297154 U CN219297154 U CN 219297154U
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Abstract
The utility model relates to a system for purifying fertilizer-grade wet-process phosphoric acid, and belongs to the technical field of industrial-grade wet-process phosphoric acid production. Comprises a feed inlet, a pretreatment system, a flat membrane filtration system, a nanofiltration system, a reverse osmosis system, a water washing system, an electrodialysis system, a diffusion dialysis system, a fertilizer-grade wet-process phosphoric acid production system, a post-treatment system and a discharge outlet. The utility model greatly reduces the energy consumption of the whole system while concentrating efficiently. The method can effectively remove impurities in the fertilizer-grade phosphoric acid, and the purified phosphoric acid can be used for preparing high-purity industrial-grade wet-process phosphoric acid, so that the method has important significance in improving the quality of industrial-grade wet-process phosphoric acid products, reducing the production cost and guaranteeing the safe operation of production equipment.
Description
Technical Field
The utility model relates to the technical field of industrial wet-process phosphoric acid production, in particular to a system for purifying fertilizer-grade wet-process phosphoric acid.
Background
With the increasing demand for clean energy, new energy phosphoric acid iron batteries are increasingly favored in the market as an efficient and environment-friendly energy storage battery. And a large amount of ferric phosphate precursors are needed for the production of new energy ferric phosphate batteries, wherein industrial wet phosphoric acid is used as a main raw material. In recent years, market demand for iron phosphate precursors has increased, and the demand for industrial wet process phosphoric acid by these enterprises has also increased year by year.
The preparation of industrial wet-process phosphoric acid from fertilizer-grade wet-process phosphoric acid refers to the preparation of industrial wet-process phosphoric acid with higher purity by further purification, concentration and other processes of fertilizer-grade phosphoric acid. The fertilizer grade phosphoric acid generally contains various impurities such as iron, aluminum, silicon, calcium and the like, and the presence of the impurities not only reduces the quality of the product, but also has adverse effects such as corrosion on production equipment and the like, so that further purification of the fertilizer grade phosphoric acid is necessary. In the prior art, methods such as calcium precipitation, solvent extraction and the like are generally used for purifying fertilizer-grade wet-process phosphoric acid to prepare industrial-grade wet-process phosphoric acid. However, the purification system is complicated in design due to the complicated process, and has a serious problem of environmental pollution.
Disclosure of Invention
First, the technical problem to be solved
In view of the above-mentioned shortcomings and disadvantages of the prior art, the present utility model provides a system for purifying wet-process phosphoric acid at fertilizer level, which solves the technical problems of complex design and easy environmental pollution of the purification system of wet-process phosphoric acid at fertilizer level.
(II) technical scheme
In order to achieve the above purpose, the main technical scheme adopted by the utility model comprises the following steps:
the embodiment of the utility model provides a system for purifying fertilizer-grade wet-process phosphoric acid, which comprises a feed inlet, a pretreatment system, a flat membrane filtration system, a nanofiltration system, a reverse osmosis system, a water washing system, an electrodialysis system, a diffusion dialysis system, a fertilizer-grade wet-process phosphoric acid production system, a post-treatment system and a discharge outlet; the feed inlet is sequentially connected with the pretreatment system and the flat membrane filtration system, the flat membrane filtration system is connected with the water inlet of the nanofiltration system, the fresh water outlet of the nanofiltration system is connected with the water inlet of the reverse osmosis system, and the concentrated water outlet of the nanofiltration system and the fresh water outlet of the reverse osmosis system are both connected with the water inlet of the electrodialysis system; the concentrated water outlet of the reverse osmosis system is connected with the water washing system, and the water washing system is also connected with the water inlet of the nanofiltration system; the water outlet of the electrodialysis system is connected with the water inlet of the diffusion dialysis system, the fresh water outlet of the diffusion dialysis system is connected with the fertilizer-grade wet-process phosphoric acid production system, and the concentrated water outlet of the diffusion dialysis system is sequentially connected with the aftertreatment system and the discharge port.
The pretreatment system serves as a homogeneous precipitation. The flat membrane filtration system is used for precise filtration to remove suspended matters and part of scaling substances in the clarified liquid of the pretreatment system. The nanofiltration system is used for removing impurities such as iron, calcium, magnesium, suspended matters and the like in the filtrate of the flat membrane system. The reverse osmosis system is used for further removing impurities such as iron, calcium, magnesium, suspended matters and the like in the permeate of the nanofiltration system. The electrodialysis system is used for re-concentrating dilute phosphoric acid after the reverse osmosis system is purified. The diffusion dialysis system is used for further concentrating the electrodialysis system concentrate. The post-treatment system is used for decoloring the diffusion dialysis concentrated solution. The water washing system is used for diluting the concentrated water of the reverse osmosis system so that the nanofiltration system can perform cyclic impurity removal.
Optionally, the pretreatment system comprises a raw material pump, a flocculation precipitation device, a water storage tank and a discharge tank;
the flocculation precipitation device is connected with the feed inlet through the raw material pump;
the flocculation precipitation device comprises a solid impurity external discharge port and a clear water outlet, the solid impurity external discharge port is connected with the discharge tank, and the clear water outlet is connected with the water storage tank;
the water storage tank is connected with the flat membrane filtration system.
Optionally, the flat membrane filtration system comprises a clarifying water pump, a flat membrane filtration device and a clean water tank;
the flat membrane filtering device is connected with the water storage tank through the clarifying water pump;
the flat membrane filtering device comprises a concentrated water outlet and a clear water outlet, the concentrated water outlet is connected with the water storage tank, and the clear water outlet is connected with the clear water tank;
the clean water tank is connected with the nanofiltration system.
Optionally, the membrane element of the flat membrane filter device is a PVDF filter membrane or a ceramic membrane, and the aperture threshold value is 0.1-1.0 μm.
Preferably, the membrane of the flat membrane filtration device is a HWTT flat ceramic membrane, and the aperture threshold is 0.1 mu m.
Optionally, the nanofiltration system comprises a nanofiltration pump, a nanofiltration device, a nanofiltration concentrated water tank and a nanofiltration water production tank;
the nanofiltration device is connected with the clean water tank through the nanofiltration pump;
the nanofiltration device comprises a concentrated water outlet and a fresh water outlet, the concentrated water outlet is connected with the nanofiltration concentrated water tank, and the fresh water outlet is connected with the nanofiltration water production tank;
the nanofiltration concentrated water tank is connected with the electrodialysis system; the nanofiltration water producing pool is connected with the water inlet of the reverse osmosis system.
Optionally, the nanofiltration device is a primary nanofiltration device or a combination of multiple stage nanofiltration devices. Preferably, a high-pressure acid-resistant nanofiltration membrane system produced by Hangzhou water treatment is adopted.
Optionally, the reverse osmosis system comprises a reverse osmosis pump, a reverse osmosis device and a reverse osmosis water producing pool;
the reverse osmosis device is connected with the nanofiltration water producing pool through the reverse osmosis pump;
the reverse osmosis device comprises a concentrated water outlet and a fresh water outlet, the concentrated water outlet is connected with the water washing system, and the fresh water outlet is connected with the reverse osmosis water producing pool;
the reverse osmosis water producing pool is connected with the electrodialysis system.
Optionally, the reverse osmosis device is a primary reverse osmosis device or a combination of multiple stages of reverse osmosis devices. Preferably, a high-pressure acid-resistant reverse osmosis membrane system produced by Hangzhou water treatment is adopted.
Optionally, the electrodialysis system comprises an electrodialysis concentrate water inlet pump, an electrodialysis fresh water inlet pump, an electrodialysis device, an electrodialysis concentrate water tank, an electrodialysis fresh water tank, an electrodialysis pole water tank, an electrodialysis concentrate water circulating pump, an electrodialysis fresh water circulating pump and an electrodialysis pole water circulating pump;
the reverse osmosis water producing pool is connected with the water inlet of the electrodialysis concentrate tank through the electrodialysis concentrate water inlet pump, the concentrate outlet of the electrodialysis concentrate tank is connected with the concentrate inlet of the electrodialysis device through the electrodialysis concentrate circulating pump, and the fresh water outlet of the electrodialysis concentrate tank is connected with the diffusion dialysis system;
the nanofiltration concentrated water tank is connected with a water inlet of the electrodialysis fresh water tank through the electrodialysis fresh water inlet pump, a concentrated water outlet of the electrodialysis fresh water tank is connected with a fresh water inlet of the electrodialysis device through the electrodialysis fresh water circulating pump, and a fresh water outlet of the electrodialysis fresh water tank is connected with the diffusion dialysis system;
the electrodialysis device further comprises a polar water inlet, and the polar water inlet is connected with the electrodialysis polar water tank through the electrodialysis polar water circulating pump;
the electrodialysis device also comprises a concentrated water outlet, a fresh water outlet and a polar water outlet; the concentrated water outlet is connected with the electrodialysis concentrated water tank, the fresh water outlet is connected with the electrodialysis fresh water tank, and the polar water outlet is connected with the electrodialysis polar water tank.
Preferably, the electrodialysis system is a JED-5000 acid-resistant electrodialysis system of HWTT.
Optionally, the diffusion dialysis system comprises a diffusion dialysis concentrate water inlet pump, a diffusion dialysis fresh water inlet pump, a diffusion dialysis device, a diffusion dialysis concentrate water tank, a diffusion dialysis fresh water tank, a diffusion dialysis concentrate circulating pump and a diffusion dialysis fresh water circulating pump;
the fresh water outlet of the electrodialysis thick water tank is connected with the water inlet of the diffusion dialysis thick water tank through the diffusion dialysis thick water inlet pump, the thick water outlet of the diffusion dialysis thick water tank is connected with the thick water inlet of the diffusion dialysis device through the diffusion dialysis thick water circulating pump, and the fresh water outlet of the diffusion dialysis thick water tank is connected with the aftertreatment system;
the fresh water outlet of the electrodialysis fresh water tank is connected with the water inlet of the diffusion dialysis fresh water tank through the diffusion dialysis fresh water inlet pump, the concentrated water outlet of the diffusion dialysis fresh water tank is connected with the fresh water inlet of the diffusion dialysis device through the diffusion dialysis fresh water circulating pump, and the fresh water outlet of the diffusion dialysis fresh water tank is connected with the fertilizer-grade wet-process phosphoric acid production system;
the diffusion dialysis device further comprises a concentrated water outlet and a fresh water outlet, wherein the concentrated water outlet is connected with the diffusion dialysis concentrated water tank, and the fresh water outlet is connected with the diffusion dialysis fresh water tank.
The diffusion dialysis system is a JDD-5000 acid-resistant diffusion dialysis system of HWTT.
Preferably, the post-treatment system is a post-treatment thermal oxidation system and comprises a sodium hydroxide feeding device, a reaction kettle with stirring, an electric heating jacket and a cooling system which are connected in sequence. Decolorizing the concentrated phosphoric acid solution subjected to diffusion dialysis treatment; the phosphoric acid after decolorization treatment can be directly used for producing industrial wet-process phosphoric acid after being cooled by a cooling system.
The water inlet of the pretreatment system can be directly connected with the outlet of the fertilizer-grade wet-process phosphoric acid production system. The concentrated water outlet of the diffusion dialysis fresh water tank can be directly connected with a fertilizer-grade wet-process phosphoric acid production system. The liquid outlet of the post-treatment system can be directly connected with an industrial-grade wet-process phosphoric acid production system.
(III) beneficial effects
The beneficial effects of the utility model are as follows: the system for purifying the fertilizer-grade wet-process phosphoric acid improves the quality of the fertilizer-grade wet-process phosphoric acid, can efficiently remove impurities in the fertilizer-grade wet-process phosphoric acid, and reduces pollution. The whole system combines the purification process and the concentration process, has compact process and simple operation. Compared with the traditional methods of calcium phosphate precipitation, solvent extraction and the like, the method does not need to use a large amount of organic solvents, avoids the pollution of the organic solvents to the environment, and simultaneously avoids the discharge of wastewater. The product purified by the system of the utility model can be used as a direct raw material for producing industrial-grade wet-process phosphoric acid.
In addition, firstly, a flat membrane filtration system is adopted for precise filtration to remove suspended matters and part of scaling substances, and then a nanofiltration membrane of a nanofiltration system is adopted for further purifying phosphoric acid, so that impurities such as iron, calcium, magnesium and suspended matters in the phosphoric acid can be removed efficiently, and pollution is reduced. The utility model utilizes the electrodialysis system and the diffusion dialysis system to concentrate the purified phosphoric acid, and combines the purification process and the concentration process, so that the whole production process is more compact, and the equipment investment cost is reduced.
The produced water discharged by the diffusion dialysis system contains divalent impurities, can enter a front-stage process to produce fertilizer phosphoric acid, has no waste discharge, and is a resource circulation process.
The utility model has the advantages of simplified production process, simple operation, automatic control and improved production efficiency and production stability.
The pretreatment system of the utility model is used for homogenizing adjustment and precipitation, and is convenient for subsequent purification and concentration treatment.
The utility model adopts nanofiltration membrane purification technology, can efficiently remove impurities in phosphoric acid, and can greatly reduce raw material consumption cost. The system of the utility model has simpler operation, lower technical level requirement of operators and corresponding reduction of operation cost.
The post-treatment system can be used for decoloring the concentrated solution obtained by the diffusion dialysis system to obtain phosphoric acid with purer color.
The water washing system can dilute the concentrated water produced by the reverse osmosis system and return the concentrated water to the nanofiltration system so as to remove impurities circularly by the nanofiltration system.
The utility model has the advantages of environmental protection, investment, operation and operability, can better adapt to market demands, and is expected to be widely applied in the field of industrial wet purification of phosphoric acid.
Drawings
FIG. 1 is a schematic diagram of a system for purifying wet process phosphoric acid of fertilizer grade according to example 1 of the present utility model.
FIG. 2 is a schematic diagram of a system for purifying fertilizer grade wet process phosphoric acid according to example 1 of the present utility model.
[ reference numerals description ]
1: a feed inlet; 2: a pretreatment system; 21: a raw material pump; 22: a flocculation precipitation device; 23: a water storage tank; 24: a discharging pool; 3: a flat membrane filtration system; 31: clarifying the water pump; 32: a flat membrane filtration device; 33: a clean water tank; 4: a nanofiltration system; 41: a nanofiltration pump; 42: a nanofiltration device; 43: a nanofiltration concentrated water tank; 44: a nanofiltration water producing pool; 5: a reverse osmosis system; 51: a reverse osmosis pump; 52: a reverse osmosis device; 53: a reverse osmosis water producing pool; 6: a water washing system; 7: an electrodialysis system; 71: electrodialysis dense water inlet pump; 72: electrodialysis fresh water inlet pump; 73: an electrodialysis device; 74: electrodialysis thick water tank; 75: electrodialysis fresh water tank; 76: electrodialysis pole water tank; 77: electrodialysis dense water circulating pump; 78: electrodialysis fresh water circulating pump; 79: electrodialysis pole water circulating pump; 8: a diffusion dialysis system; 81: a diffusion dialysis concentrated water inlet pump; 82: diffusion dialysis fresh water inlet pump; 83: a diffusion dialysis device; 84: a diffusion dialysis concentrate tank; 85: diffusion dialysis fresh water tank; 86: a diffusion dialysis concentrate circulating pump; 87: a diffusion dialysis fresh water circulating pump; 9: a fertilizer grade wet process phosphoric acid production system; 10: a post-processing system; 11: and a discharge port.
Detailed Description
The utility model will be better explained by the following detailed description of the embodiments with reference to the drawings.
In order that the above-described aspects may be better understood, exemplary embodiments of the present utility model will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present utility model are shown in the drawings, it should be understood that the present utility model may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the utility model to those skilled in the art.
Example 1:
the system for purifying the fertilizer-grade wet-process phosphoric acid can remove impurities such as iron, calcium, magnesium and suspended matters in the fertilizer-grade wet-process phosphoric acid, and achieves the industrial-grade wet-process phosphoric acid standard. Specifically, the system for purifying the fertilizer-grade wet-process phosphoric acid by adopting the membrane method comprises a membrane purification system, a membrane concentration system and a post-treatment system.
Wherein the membrane purification system, the membrane concentration system and the post-treatment system are sequentially arranged; the membrane purification system is used for removing impurities such as iron, calcium, magnesium, suspended matters and the like in the fertilizer-grade wet-process phosphoric acid. The membrane concentration system is used for re-concentrating the purified dilute phosphoric acid. The post-treatment system is used for decoloring the concentrated solution. According to the process for purifying the fertilizer-grade wet-process phosphoric acid by the membrane method, a flat membrane filtration system is adopted to remove suspended matters of the fertilizer-grade wet-process phosphoric acid, and iron, calcium and magnesium are intercepted by a high-pressure acid-resistant nanofiltration system, an acid-resistant nanofiltration system and a reverse osmosis system. The purified phosphoric acid is concentrated with low energy consumption by using an electrodialysis system and a diffusion dialysis system. And according to the treatment characteristics of the respective membranes, the membranes are reasonably arranged. The energy consumption of the whole system is greatly reduced while the concentration is efficient.
Referring to fig. 1, a system for purifying fertilizer grade wet process phosphoric acid comprises a feed inlet 1, a pretreatment system 2, a flat membrane filtration system 3, a nanofiltration system 4, a reverse osmosis system 5, a water washing system 6, an electrodialysis system 7, a diffusion dialysis system 8, a fertilizer grade wet process phosphoric acid production system 9, a post-treatment system 10 and a discharge outlet 11; the feed inlet 1 is sequentially connected with the pretreatment system 2 and the flat membrane filtration system 3, the flat membrane filtration system 3 is connected with the water inlet of the nanofiltration system 4, the fresh water outlet of the nanofiltration system 4 is connected with the water inlet of the reverse osmosis system 5, and the concentrated water outlet of the nanofiltration system 4 and the fresh water outlet of the reverse osmosis system 5 are both connected with the water inlet of the electrodialysis system 7; the concentrated water outlet of the reverse osmosis system 5 is connected with the water washing system 6, and the water washing system 6 is also connected with the water inlet of the nanofiltration system 4; the water outlet of the electrodialysis system 7 is connected with the water inlet of the diffusion dialysis system 8, the fresh water outlet of the diffusion dialysis system 8 is connected with the fertilizer-grade wet-process phosphoric acid production system 9, and the concentrated water outlet of the diffusion dialysis system 8 is sequentially connected with the aftertreatment system 10 and the discharge port 11.
Referring to fig. 2, the pretreatment system 2 of the present utility model includes a raw material pump 21, a flocculation precipitation device 22, a water storage tank 23, and a discharge tank 24;
the flocculation precipitation device 22 is connected with the feed inlet 1 through a raw material pump 21;
the flocculation precipitation device 22 also comprises a solid impurity external discharge port and a clear water outlet, wherein the solid impurity external discharge port is connected with a discharge tank 24, and the clear water outlet is connected with a water storage tank 23; the water reservoir 23 is connected to the flat membrane filtration system 3.
The flat membrane filtration system 3 of the utility model comprises a clarifying water pump 31, a flat membrane filtration device 32 and a clean water tank 33;
the flat membrane filter 32 is connected with the water storage tank 23 through a clarifying water pump 31;
the flat membrane filter 32 comprises a concentrated water outlet and a clear water outlet, wherein the concentrated water outlet is connected with the water storage tank 23, and the clear water outlet is connected with the clear water tank 33; the clean water tank 33 is connected with the nanofiltration system 4.
The membrane element of the flat membrane filtration device 32 of the present utility model is a PVDF filter membrane or a ceramic membrane, and the pore size threshold is 0.1 to 1.0. Mu.m.
The nanofiltration system 4 of the utility model comprises a nanofiltration pump 41, a nanofiltration device 42, a nanofiltration concentrated water tank 43 and a nanofiltration water production tank 44;
the nanofiltration device 42 is connected with the clean water tank 33 through a nanofiltration pump 41;
the nanofiltration device 42 comprises a concentrated water outlet and a fresh water outlet, wherein the concentrated water outlet is connected with a nanofiltration concentrated water tank 43, and the fresh water outlet is connected with a nanofiltration water production tank 44;
the nanofiltration concentrated water tank 43 is connected with the electrodialysis system 7; the nanofiltration water production pool 44 is connected with the water inlet of the reverse osmosis system 5.
The nanofiltration device 42 of the present utility model is a one-stage nanofiltration device or a combination of multi-stage nanofiltration devices.
The reverse osmosis system 5 of the present utility model comprises a reverse osmosis pump 51, a reverse osmosis device 52, and a reverse osmosis water producing tank 53;
the reverse osmosis device 52 is connected with the nanofiltration water production pool 44 through a reverse osmosis pump 51;
the reverse osmosis device 52 comprises a concentrated water outlet and a fresh water outlet, the concentrated water outlet is connected with the water washing system 6, and the fresh water outlet is connected with a reverse osmosis water producing tank 53; the reverse osmosis water producing pond 53 is connected to the electrodialysis system 7.
The reverse osmosis unit 52 of the present utility model is a primary reverse osmosis unit or a combination of multiple reverse osmosis units.
The electrodialysis system 7 comprises an electrodialysis concentrate water inlet pump 71, an electrodialysis fresh water inlet pump 72, an electrodialysis device 73, an electrodialysis concentrate water tank 74, an electrodialysis fresh water tank 75, an electrodialysis pole water tank 76, an electrodialysis concentrate water circulating pump 77, an electrodialysis fresh water circulating pump 78 and an electrodialysis pole water circulating pump 79;
the reverse osmosis water producing pool 53 is connected with a water inlet of an electrodialysis concentration water tank 74 through an electrodialysis concentration water inlet pump 71, a concentration water outlet of the electrodialysis concentration water tank 74 is connected with a concentration water inlet of an electrodialysis device 73 through an electrodialysis concentration water circulating pump 77, and a fresh water outlet of the electrodialysis concentration water tank 74 is connected with a diffusion dialysis system 8;
the nanofiltration concentrated water pond 43 is connected with a water inlet of an electrodialysis fresh water tank 75 through an electrodialysis fresh water inlet pump 72, a concentrated water outlet of the electrodialysis fresh water tank 75 is connected with a fresh water inlet of an electrodialysis device 73 through an electrodialysis fresh water circulating pump 78, and a fresh water outlet of the electrodialysis fresh water tank 75 is connected with a diffusion dialysis system 8;
the electrodialysis device 73 further comprises a polar water inlet which is connected with the electrodialysis polar water tank 76 through an electrodialysis polar water circulating pump 79;
the electrodialysis device 73 further comprises a concentrate outlet, a fresh water outlet and a polar water outlet; the concentrated water outlet is connected with an electrodialysis concentrated water tank 74, the fresh water outlet is connected with an electrodialysis fresh water tank 75, and the polar water outlet is connected with an electrodialysis polar water tank 76.
The diffusion dialysis system 8 of the present utility model comprises a diffusion dialysis concentrate water inlet pump 81, a diffusion dialysis fresh water inlet pump 82, a diffusion dialysis device 83, a diffusion dialysis concentrate water tank 84, a diffusion dialysis fresh water tank 85, a diffusion dialysis concentrate circulating pump 86 and a diffusion dialysis fresh water circulating pump 87;
the fresh water outlet of the electrodialysis thick water tank 74 is connected with the water inlet of the diffusion dialysis thick water tank 84 through the diffusion dialysis thick water inlet pump 81, the thick water outlet of the diffusion dialysis thick water tank 84 is connected with the thick water inlet of the diffusion dialysis device 83 through the diffusion dialysis thick water circulating pump 86, and the fresh water outlet of the diffusion dialysis thick water tank 84 is connected with the aftertreatment system 10;
the fresh water outlet of the electrodialysis fresh water tank 75 is connected with the water inlet of the diffusion dialysis fresh water tank 85 through a diffusion dialysis fresh water inlet pump 82, the concentrated water outlet of the diffusion dialysis fresh water tank 85 is connected with the fresh water inlet of the diffusion dialysis device 83 through a diffusion dialysis fresh water circulating pump 87, and the fresh water outlet of the diffusion dialysis fresh water tank 85 is connected with the fertilizer-grade wet-process phosphoric acid production system 9;
the diffusion dialysis device 83 further comprises a concentrate outlet connected to the diffusion dialysis concentrate tank 84 and a fresh water outlet connected to the diffusion dialysis concentrate tank 85.
Example 2:
this example provides a method for purifying fertilizer grade wet process phosphoric acid using the system of example 1, comprising the steps of:
(1) Introducing the fertilizer-grade wet-process phosphoric acid product into a pretreatment system for homogenization adjustment and precipitation pretreatment;
(2) Introducing the pretreated clarified material into a flat membrane filtration system for precise filtration, and removing suspended matters and part of scaling substances in clarified liquid of the pretreatment system to obtain filtered concentrated water and clear material;
(3) Refluxing the filtered concentrated water obtained in the step (2) to a pretreatment pool for reprecipitation, and repeating the operation step (2);
(4) The clear material obtained in the step (2) enters a nanofiltration device for nanofiltration treatment, and iron, calcium and magnesium are removed to obtain nanofiltration concentrated water and nanofiltration fresh water;
wherein the pressure threshold of nanofiltration treatment is 5.0-12MPa, and the concentration multiple threshold is 2-4.
The pressure threshold for the nanofiltration treatment in this example is preferably 7.0MPa.
In the embodiment, after the nanofiltration treatment in the step (4), impurities such as iron, calcium, magnesium and the like in the original liquid are trapped on the concentrated water side, and the impurity content in the obtained nanofiltration fresh water is less than 20mg/L.
(5) And (3) introducing the nanofiltration fresh water obtained in the step (4) into a reverse osmosis device to further remove iron, calcium and magnesium. The reverse osmosis device carries out reverse osmosis treatment to obtain reverse osmosis concentrated water and reverse osmosis fresh water;
wherein the operating pressure threshold of reverse osmosis treatment is 3-7MPa, and the concentration multiple threshold is 2-3.
In the embodiment, after the reverse osmosis treatment in the step (5), impurities such as iron, calcium, magnesium and the like in the nanofiltration fresh water are further removed, and the impurity content in the obtained reverse osmosis fresh water is less than 10mg/L.
(6) And (3) respectively feeding the nanofiltration concentrated water obtained in the step (4) and the reverse osmosis fresh water obtained in the step (5) into the fresh water side and the concentrated water side of an electrodialysis device for primary concentration. Electrodialysis treatment is carried out by the electrodialysis device to obtain electrodialysis concentrated water and electrodialysis fresh water;
wherein, the electrodialysis membrane of the electrodialysis treatment system is HWTT acid-resistant separation membrane, and P in the concentrated water of the electrodialysis treatment system 2 O 5 The content is more than 10 percent.
(7) And (3) respectively feeding the electrodialysis concentrated water and the electrodialysis fresh water obtained in the step (6) into a concentrated water side and a fresh water side of a diffusion dialysis device for concentration again. The diffusion dialysis device carries out diffusion dialysis treatment to obtain diffusion dialysis concentrated water and diffusion dialysis fresh water;
wherein, P in diffusion dialysis concentrated water 2 O 5 Greater than 20%, fe 3 O 3 、Al 2 O 3 And MgO is less than 10mg/L.
(8) The diffusion dialysis concentrated water obtained in the step (7) enters a post-treatment system for decolorization treatment;
(9) The effluent of the post-treatment system obtained in the step (8) enters a discharge port for recycling or enters an industrial wet-process phosphoric acid production system;
(10) The diffusion dialysis fresh water obtained in the step (7) enters a fertilizer-grade wet-process phosphoric acid production system, such as a process section of ore dissolution and the like;
(11) And (3) feeding the reverse osmosis concentrated water obtained in the step (5) into a water washing system, regulating the acid concentration through pH monitoring, and then refluxing to a nanofiltration system, and repeating the operation (4).
Example 3:
the specification of the product of a fertilizer grade phosphoric acid production enterprise is as follows: p (P) 2 O 5 The concentration was 589700ppm, the Fe concentration was 7262ppm, the Ca concentration was 1200ppm, the Mg concentration was 1000ppm and the turbidity was 10. Into the system for purifying fertilizer grade wet phosphoric acid in example 1, a flat membrane filter was used to remove fertilizer grade wet phosphoric acid suspended matter, and iron, calcium and magnesium were trapped by a high pressure acid resistant nanofiltration and acid resistant nanofiltration system and a reverse osmosis system. The purified phosphoric acid is concentrated with high efficiency at low energy consumption by electrodialysis and diffusion dialysis.
The fertilizer-grade wet-process phosphoric acid is treated by a flat membrane filter, and is mixed with reverse osmosis concentrated water after being washed by water after suspended matters are removed. The mixed solution enters a high-pressure acid-resistant nanofiltration membrane for impurity separation, and the high-pressure nanofiltration membrane is circulated through concentrated water, so that the recovery rate is controlled to be about 64%. The vast majority of iron, calcium, magnesium and aluminum ions are trapped. Nanofiltration postcut off pale phosphoric acid side P 2 O 5 The concentration is about 42000ppm, and the reverse osmosis secondary impurity removal is performed. The reverse osmosis concentrate side contains residual divalent ions, and direct nanofiltration separation can cause divalent ion enrichment. The water enters a water washing system, and the water is refluxed to nanofiltration water after the acid concentration is regulated through pH monitoring. P in reverse osmosis fresh water 2 O 5 The concentration was about 40000ppm, and the secondary purification and primary concentration were carried out by an acid-resistant electrodialysis system. Concentrated phosphoric acid and reverse osmosis fresh water of the high-pressure acid-resistant nanofiltration membrane system respectively enter the fresh water side and the concentrated water side of the electrodialysis system for concentrationAnd (5) processing. Concentrated phosphoric acid side P after electrodialysis system treatment 2 O 5 At a concentration of about 120000ppm, light phosphoric acid P 2 O 5 The concentration is 20000ppm, and the mixture is further concentrated by diffusion dialysis. Diffusion infiltration fresh water P 2 O 5 The concentration is 4000ppm, and heavy metals such as iron, calcium, magnesium, aluminum and the like are returned to the front-stage phosphoric acid production of enterprises, such as ore dissolution and the like for recycling. Diffusion permeation to produce purified phosphoric acid P 2 O 5 The 200000ppm concentration enters a thermal oxidation decoloration system to meet the requirements of a subsequent industrial wet-process phosphoric acid production system.
In the description of the present utility model, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; may be a communication between two elements or an interaction between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present utility model, unless expressly stated or limited otherwise, a first feature is "on" or "under" a second feature, which may be in direct contact with the first and second features, or in indirect contact with the first and second features via an intervening medium. Moreover, a first feature "above," "over" and "on" a second feature may be a first feature directly above or obliquely above the second feature, or simply indicate that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is level lower than the second feature.
In the description of the present specification, the terms "one embodiment," "some embodiments," "examples," "particular examples," or "some examples," etc., refer to particular features, structures, materials, or characteristics described in connection with the embodiment or example as being included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that alterations, modifications, substitutions and variations may be made in the above embodiments by those skilled in the art within the scope of the utility model.
Claims (10)
1. A system for purifying fertilizer-grade wet-process phosphoric acid, which is characterized by comprising a feed inlet (1), a pretreatment system (2), a flat membrane filtration system (3), a nanofiltration system (4), a reverse osmosis system (5), a water washing system (6), an electrodialysis system (7), a diffusion dialysis system (8), a fertilizer-grade wet-process phosphoric acid production system (9), a post-treatment system (10) and a discharge outlet (11); the feed inlet (1) is sequentially connected with the pretreatment system (2) and the flat membrane filtration system (3), the flat membrane filtration system (3) is connected with a water inlet of the nanofiltration system (4), a fresh water outlet of the nanofiltration system (4) is connected with a water inlet of the reverse osmosis system (5), and a concentrated water outlet of the nanofiltration system (4) and a fresh water outlet of the reverse osmosis system (5) are both connected with a water inlet of the electrodialysis system (7); the concentrated water outlet of the reverse osmosis system (5) is connected with the water washing system (6), and the water washing system (6) is also connected with the water inlet of the nanofiltration system (4); the water outlet of the electrodialysis system (7) is connected with the water inlet of the diffusion dialysis system (8), the fresh water outlet of the diffusion dialysis system (8) is connected with the fertilizer-grade wet-process phosphoric acid production system (9), and the concentrated water outlet of the diffusion dialysis system (8) is sequentially connected with the aftertreatment system (10) and the discharge port (11).
2. The system for purifying fertilizer grade wet process phosphoric acid according to claim 1, wherein the pretreatment system (2) comprises a raw material pump (21), a flocculation precipitation device (22), a water storage tank (23) and a discharge tank (24);
the flocculation precipitation device (22) is connected with the feed inlet (1) through the raw material pump (21);
the flocculation precipitation device (22) comprises a solid impurity external discharge outlet and a clear water outlet, the solid impurity external discharge outlet is connected with the discharge tank (24), and the clear water outlet is connected with the water storage tank (23);
the water storage tank (23) is connected with the flat membrane filtration system (3).
3. The system for purifying fertilizer grade wet process phosphoric acid according to claim 2, wherein the flat membrane filtration system (3) comprises a clarification water pump (31), a flat membrane filtration device (32) and a clean water basin (33);
the flat membrane filter device (32) is connected with the water storage tank (23) through the clarifying water pump (31);
the flat membrane filtering device (32) comprises a concentrated water outlet and a clear water outlet, the concentrated water outlet is connected with the water storage tank (23), and the clear water outlet is connected with the clear water tank (33);
the clean water tank (33) is connected with the nanofiltration system (4).
4. A system for purifying fertilizer grade wet process phosphoric acid according to claim 3, wherein the membrane element of the flat membrane filtration device (32) is a PVDF filter membrane or a ceramic membrane, and the pore size threshold is 0.1-1.0 μm.
5. A system for purifying fertilizer grade wet process phosphoric acid according to claim 3, characterized in that the nanofiltration system (4) comprises a nanofiltration pump (41), a nanofiltration device (42), a nanofiltration concentrate pond (43) and a nanofiltration product pond (44);
the nanofiltration device (42) is connected with the clean water tank (33) through the nanofiltration pump (41);
the nanofiltration device (42) comprises a concentrated water outlet and a fresh water outlet, wherein the concentrated water outlet is connected with the nanofiltration concentrated water tank (43), and the fresh water outlet is connected with the nanofiltration water production tank (44);
the nanofiltration concentrated water tank (43) is connected with the electrodialysis system (7); the nanofiltration water producing pool (44) is connected with the water inlet of the reverse osmosis system (5).
6. The system for purifying fertilizer grade wet process phosphoric acid according to claim 5, wherein the nanofiltration device (42) is a primary nanofiltration device or a combination of multiple nanofiltration devices.
7. The system for purifying fertilizer grade wet process phosphoric acid according to claim 5, wherein the reverse osmosis system (5) comprises a reverse osmosis pump (51), a reverse osmosis device (52), a reverse osmosis water producing tank (53);
the reverse osmosis device (52) is connected with the nanofiltration water production pool (44) through the reverse osmosis pump (51);
the reverse osmosis device (52) comprises a concentrated water outlet and a fresh water outlet, the concentrated water outlet is connected with the water washing system (6), and the fresh water outlet is connected with the reverse osmosis water producing tank (53);
the reverse osmosis water producing tank (53) is connected with the electrodialysis system (7).
8. The system for purifying fertilizer grade wet process phosphoric acid of claim 7, wherein the reverse osmosis device (52) is a primary reverse osmosis device or a combination of multiple reverse osmosis devices.
9. The system for purifying fertilizer grade wet process phosphoric acid according to claim 7, wherein the electrodialysis system (7) comprises an electrodialysis concentrate water inlet pump (71), an electrodialysis fresh water inlet pump (72), an electrodialysis device (73), an electrodialysis concentrate water tank (74), an electrodialysis fresh water tank (75), an electrodialysis pole water tank (76), an electrodialysis concentrate water circulating pump (77), an electrodialysis fresh water circulating pump (78) and an electrodialysis pole water circulating pump (79);
the reverse osmosis water producing tank (53) is connected with a water inlet of the electrodialysis concentrate tank (74) through the electrodialysis concentrate water inlet pump (71), a concentrate outlet of the electrodialysis concentrate tank (74) is connected with a concentrate inlet of the electrodialysis device (73) through the electrodialysis concentrate circulating pump (77), and a fresh water outlet of the electrodialysis concentrate tank (74) is connected with the diffusion dialysis system (8);
the nanofiltration concentrated water tank (43) is connected with a water inlet of the electrodialysis fresh water tank (75) through the electrodialysis fresh water inlet pump (72), a concentrated water outlet of the electrodialysis fresh water tank (75) is connected with a fresh water inlet of the electrodialysis device (73) through the electrodialysis fresh water circulating pump (78), and a fresh water outlet of the electrodialysis fresh water tank (75) is connected with the diffusion dialysis system (8);
the electrodialysis device (73) further comprises a polar water inlet which is connected with the electrodialysis polar water tank (76) through the electrodialysis polar water circulating pump (79);
the electrodialysis device (73) further comprises a concentrated water outlet, a fresh water outlet and a polar water outlet; the concentrated water outlet is connected with the electrodialysis concentrated water tank (74), the fresh water outlet is connected with the electrodialysis fresh water tank (75), and the polar water outlet is connected with the electrodialysis polar water tank (76).
10. The system for purifying fertilizer grade wet phosphoric acid according to claim 9, wherein the diffusion dialysis system (8) comprises a diffusion dialysis concentrate water inlet pump (81), a diffusion dialysis fresh water inlet pump (82), a diffusion dialysis device (83), a diffusion dialysis concentrate water tank (84), a diffusion dialysis fresh water tank (85), a diffusion dialysis concentrate water circulation pump (86) and a diffusion dialysis fresh water circulation pump (87);
the fresh water outlet of the electrodialysis thick water tank (74) is connected with the water inlet of the diffusion dialysis thick water tank (84) through the diffusion dialysis thick water inlet pump (81), the thick water outlet of the diffusion dialysis thick water tank (84) is connected with the thick water inlet of the diffusion dialysis device (83) through the diffusion dialysis thick water circulating pump (86), and the fresh water outlet of the diffusion dialysis thick water tank (84) is connected with the aftertreatment system (10);
the fresh water outlet of the electrodialysis fresh water tank (75) is connected with the water inlet of the diffusion dialysis fresh water tank (85) through the diffusion dialysis fresh water inlet pump (82), the concentrated water outlet of the diffusion dialysis fresh water tank (85) is connected with the fresh water inlet of the diffusion dialysis device (83) through the diffusion dialysis fresh water circulating pump (87), and the fresh water outlet of the diffusion dialysis fresh water tank (85) is connected with the fertilizer-grade wet-process phosphoric acid production system (9);
the diffusion dialysis device (83) further comprises a concentrate outlet and a fresh water outlet, the concentrate outlet is connected with the diffusion dialysis concentrate tank (84), and the fresh water outlet is connected with the diffusion dialysis fresh water tank (85).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320787316.4U CN219297154U (en) | 2023-04-11 | 2023-04-11 | System for be used for purifying fertilizer level wet process phosphoric acid |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320787316.4U CN219297154U (en) | 2023-04-11 | 2023-04-11 | System for be used for purifying fertilizer level wet process phosphoric acid |
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| CN219297154U true CN219297154U (en) | 2023-07-04 |
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| CN202320787316.4U Active CN219297154U (en) | 2023-04-11 | 2023-04-11 | System for be used for purifying fertilizer level wet process phosphoric acid |
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