Liquid monoammonium phosphate and ferric phosphate production system
By combining a mother liquor treatment device and an online pH monitoring device, liquid monoammonium phosphate is directly generated for the synthesis of iron phosphate, which solves the problems of high material conversion complexity and high energy consumption in the existing technology, and achieves the effect of efficient material conversion and reduced energy consumption.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUIZHOU BATIAN ECOTYPIC ENG CO LTD
- Filing Date
- 2025-04-29
- Publication Date
- 2026-06-26
AI Technical Summary
In the existing monoammonium phosphate production process, the conversion from solid ammonium to liquid form is complex, resulting in high equipment complexity and increased energy consumption, which affects production efficiency and cost control.
The system employs a mother liquor treatment device, a pH adjustment tank, a purified phosphate storage tank, a liquid monoammonium phosphate storage tank, and an iron phosphate production device. The reaction is controlled in real time by an online pH monitoring device, directly generating liquid monoammonium phosphate for use in iron phosphate synthesis, simplifying the process and reducing energy consumption.
It improved production efficiency, reduced energy consumption, simplified the material conversion process, and ensured raw material quality and production stability.
Smart Images
Figure CN224411416U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of chemical preparation, and in particular to a liquid monoammonium phosphate and iron phosphate production system. Background Technology
[0002] In the production processes of monoammonium phosphate (MAP) and ferric phosphate, MAP plays a crucial intermediate role as a raw material in the ferric phosphate synthesis stage. In traditional processes, MAP first undergoes a neutralization reaction to generate a solid intermediate product, namely fixed ammonium phosphate. Subsequently, during the co-precipitation reaction of ferric phosphate, the solid ammonium phosphate needs to be dissolved into a liquid form. This process involves complex crystallization, drying, storage, and redissolution steps, which not only increases the complexity of the equipment but also significantly increases energy consumption. For example, the dissolution process requires additional electricity for heating and stirring to complete the material conversion, and the frequent changes in material form make the production process more cumbersome, making it difficult to meet the ever-increasing demands of current production processes.
[0003] Therefore, when converting monoammonium phosphate (MAP) to a liquid form to meet the needs of the ferric phosphate synthesis stage, a more efficient material conversion method is urgently needed. This method should simplify the production process, reduce energy consumption, and ensure the required liquid form for the co-precipitation reaction of MAP and ferric phosphate. Current technical solutions suffer from high equipment complexity and increased energy consumption, which limit further improvements in production efficiency. A new material conversion and connection scheme is urgently needed to solve these problems.
[0004] In short, the existing monoammonium phosphate (MAP) production process involves multiple complex steps in converting solid MAP into a liquid form, resulting in high equipment complexity and increased energy consumption, which seriously affects production efficiency and cost control. Therefore, researching and developing a more efficient material conversion method to simplify the production process and reduce energy consumption has become an urgent technical problem to be solved. Utility Model Content
[0005] To overcome the shortcomings of existing technologies, this application provides a liquid monoammonium phosphate and iron phosphate production system to simplify the production process and reduce energy consumption, and to provide a more efficient material conversion and connection scheme.
[0006] The technical solution adopted by this application to solve its technical problem is:
[0007] A liquid monoammonium phosphate and ferric phosphate production system includes a mother liquor treatment device, a pH adjustment tank, a purified phosphate storage tank, a liquid monoammonium phosphate storage tank, and a ferric phosphate production device.
[0008] The output end of the mother liquor treatment device is connected to the first input end of the pH return tank, and the output end of the purified phosphate storage tank is connected to the second input end of the pH return tank, for injecting purified phosphate and mother liquor to be returned into the pH return tank;
[0009] The mixing reaction zone of the pH recovery tank is configured to neutralize the mother liquor to be recovered with purified phosphoric acid in a preset ratio to generate liquid monoammonium phosphate.
[0010] The input end of the liquid monoammonium phosphate storage tank is connected to the output end of the pH adjustment tank, and the output end of the liquid monoammonium phosphate storage tank is connected to the raw material inlet of the iron phosphate production device. The iron phosphate production device is configured to synthesize iron phosphate using the liquid monoammonium phosphate as raw material.
[0011] Optionally, the pH recovery tank is integrated with an online pH monitoring device for real-time detection of the pH value of the liquid monoammonium phosphate reaction solution.
[0012] Optionally, the online pH monitoring device includes two online pH meters.
[0013] Optionally, the mother liquor treatment device includes a decalcification device, a denitrification device, and a triple-effect purification device;
[0014] The input end of the decalcification device receives frozen mother liquor, and the output end of the decalcification device is connected to the input end of the denitrification device.
[0015] The output end of the denitrification device is connected to the input end of the triple-effect purification device, and the output end of the triple-effect purification device is connected to the first input end of the pH return tank.
[0016] Optionally, the triple-effect purification device includes a first purification unit, a second purification unit, and a third purification unit;
[0017] The input terminal of the first purification unit is connected to the output terminal of the denitrification device, and the output terminal of the first purification unit is connected to the input terminal of the second purification unit.
[0018] The output of the second purification unit is connected to the input of the third purification unit, and the output of the third purification unit is connected to the first input of the callback pH tank.
[0019] Optionally, the triple-effect purification device also includes a purification agent feeding tank;
[0020] The output end of the purifying agent feeding tank is connected to the feeding end of the first purification unit.
[0021] Optionally, a star-shaped feeder is provided at the bottom of the trough of the purifying agent feeding tank to ensure that the purifying agent is supplied to the first purification unit evenly and stably.
[0022] Optionally, the denitrification device includes a first denitrification unit, a second denitrification unit, a filter press unit, and a third denitrification unit;
[0023] The input end of the first denitrification unit is connected to the output end of the decalcification device, the first output end of the first denitrification unit is connected to the input end of the second denitrification unit, the first output end of the second denitrification unit is connected to the input end of the filter press unit, the first output end of the filter press unit is connected to the input end of the third denitrification unit, and the first output end of the third denitrification unit is connected to the input end of the triple-effect purification device.
[0024] Optionally, the denitrification device further includes a condensation unit;
[0025] The condensation unit is configured in correspondence with the denitrification device, and the second output terminal of each denitrification unit in the denitrification device is connected to the input terminal of a condensation unit.
[0026] Optionally, the second output end of the filter press unit is connected to the first input end of an external nitrate phosphate fertilizer production device, and the output end of each condensation unit is connected to the second input end of the nitrate phosphate fertilizer production device.
[0027] The beneficial effects of this application are as follows: The mother liquor treatment device is used to treat mother liquor containing specific impurities, ensuring that the extracted filtrate has high purity, thereby improving the quality of raw materials. Liquid monoammonium phosphate is directly generated in the pH adjustment tank by purifying phosphoric acid and the mother liquor to be adjusted, avoiding the steps of generating solid monoammonium phosphate and preparing solid monoammonium phosphate into liquid monoammonium phosphate in the ferric phosphate workshop, which are required in traditional processes. It directly generates liquid monoammonium phosphate that can be used to produce ferric phosphate in the ferric phosphate unit, eliminating the multiple material transformations required in traditional processes, improving production efficiency, and helping to reduce production costs. Attached Figure Description
[0028] Figure 1 This is a schematic diagram of the apparatus for producing liquid monoammonium phosphate and iron phosphate according to an embodiment of this application;
[0029] Figure 2 This is a schematic diagram of the water balance of the liquid monoammonium phosphate and iron phosphate production system according to an embodiment of this application;
[0030] Figure 3 This is a schematic diagram of the process flow of the liquid monoammonium phosphate and iron phosphate production system provided in the embodiments of this application.
[0031] Figure label:
[0032] 1. Mother liquor treatment unit; 2. pH adjustment tank; 3. Purified phosphate storage tank; 4. Liquid monoammonium phosphate storage tank; 5. Ferric phosphate production unit. Detailed Implementation
[0033] The present application will be further described below with reference to the accompanying drawings and embodiments.
[0034] The following will clearly and completely describe the concept, specific structure, and resulting technical effects of this application in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of this application. Obviously, the described embodiments are only a part of the embodiments of this application, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are all within the scope of protection of this application. Furthermore, all connections / linkages involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. The various technical features in this application can be combined interactively without contradicting each other.
[0035] Reference Figure 1 , Figure 1 This is a schematic diagram of the apparatus for producing liquid monoammonium phosphate and ferric phosphate according to an embodiment of this application. It shows the various components of the apparatus provided in this embodiment, including a mother liquor treatment device 1, a pH adjustment tank 2, a purified phosphate storage tank 3, a liquid monoammonium phosphate storage tank 4, and a ferric phosphate production device 5, wherein:
[0036] Regarding the mother liquor treatment device 1: The output end of the mother liquor treatment device 1 is connected to the first input end of the pH return tank 2. Specifically, the mother liquor treatment device 1 includes multiple sub-devices to perform processing steps such as decalcification, filtration, denitrification, and concentration on the frozen mother liquor input therein. It is the core unit for treating raw mother liquor (such as impurity-containing mother liquor from previous processes). It removes impurities (such as calcium ions, nitrate ions, suspended solids, etc.) from the mother liquor through multi-stage purification and concentration processes (such as decalcification, denitrification, and impurity filtration) to generate a mother liquor to be returned that meets the reaction requirements. This mother liquor to be returned is transported to the first input end of the pH return tank 2 through the output end as one of the raw materials for the synthesis of liquid monoammonium phosphate.
[0037] Regarding the purified phosphoric acid storage tank 3: It is used to inject purified phosphoric acid into the pH adjustment tank 2. The purified phosphoric acid storage tank 3 is a special container for storing phosphoric acid that has undergone deep purification treatment. The phosphoric acid inside has had metal ions and organic impurities removed through processes such as adsorption, ion exchange, or extraction, and its purity meets the preset standard. The purified phosphoric acid is injected into the second input end of the pH adjustment tank 2 through the output end of the storage tank, and is mixed with the mother liquor to be adjusted in proportion. In the neutralization reaction, it participates as an acidic component in the formation of liquid monoammonium phosphate.
[0038] Regarding pH adjustment tank 2: The mixing reaction zone of pH adjustment tank 2 is configured to neutralize the mother liquor to be adjusted with purified phosphoric acid in a preset ratio to generate liquid monoammonium phosphate. Specifically, in existing processes, solid monoammonium phosphate is usually prepared first through a corresponding preparation method. In the process of producing ferric phosphate, the prepared solid monoammonium phosphate needs to be converted into liquid monoammonium phosphate, and then ferric phosphate is prepared based on the converted liquid monoammonium phosphate.
[0039] Furthermore, in this embodiment of the application, an online pH monitoring device is integrated in the pH return tank 2. The online pH monitoring device may be two or more pH meters, which are used to detect the pH value of the liquid monoammonium phosphate reaction solution in real time.
[0040] Specifically, multiple online pH monitoring devices (e.g., two or more pH meters) are integrated into the pH return tank 2. By distributing them at different positions in the tank, the pH distribution of the reaction solution is detected in real time to ensure the uniformity of the neutralization reaction and the reliability of the data.
[0041] More specifically, multiple pH meters reduce the risk of single-point failure through redundant design (such as other probes still providing valid data when one probe fails), and improve the overall accuracy of pH monitoring through data fusion algorithms (such as weighted averaging or outlier removal), thereby enabling monitoring to ensure the production quality and process stability of liquid monoammonium phosphate.
[0042] Furthermore, referring to Figure 2 , Figure 2 This is a water balance diagram of the liquid monoammonium phosphate and ferric phosphate production system according to an embodiment of this application. A water balance diagram is a chart used to describe the flow, use, and recycling of water resources in a production line. The following is in conjunction with... Figure 2 Please provide a detailed explanation:
[0043] The mother liquor is fed into the mother liquor treatment device 1 to perform decalcification, denitrification and other steps. In this embodiment, the mother liquor treatment device 1 includes a decalcification device, a denitrification device and a triple-effect purification device; the input end of the decalcification device receives frozen mother liquor, and the output end of the decalcification device is connected to the input end of the denitrification device.
[0044] Specifically, in combination Figure 2 As can be seen, the frozen mother liquor is first fed into the decalcification device, and the decalcified substance is vacuum filtered to obtain the first nitric-phosphoric acid mixture. The obtained first nitric-phosphoric acid mixture is then fed into the denitrification device, and after the steps of primary denitrification, secondary denitrification, pressure filtration, tertiary denitrification and dilute acid preparation are carried out in sequence, dilute phosphoric acid that has completed decalcification and denitrification is obtained.
[0045] Furthermore, the output end of the denitrification device is connected to the input end of the triple-effect purification device, and the output end of the triple-effect purification device is connected to the first input end of the pH return tank 2.
[0046] Specifically, refer to Figure 3 , Figure 3 This is a schematic diagram of the process flow of a liquid monoammonium phosphate and ferric phosphate production system provided in this application embodiment. Dilute phosphoric acid, after decalcification and denitrification treatment, is input into a triple-effect purification device for sequential purification in three stages. Therefore, in this application embodiment, the triple-effect purification device includes a first purification unit, a second purification unit, and a third purification unit; the input end of the first purification unit is connected to the output end of the denitrification device, the output end of the first purification unit is connected to the input end of the second purification unit, the output end of the second purification unit is connected to the input end of the third purification unit, and the output end of the third purification unit is connected to the first input end of the pH adjustment tank 2.
[0047] Specifically, the obtained dilute phosphoric acid is purified in the first purification unit by a purifying agent. After the first purification is completed, it enters the second and third purification units in sequence. In the second and third purification units, gaseous ammonia is added to purify the liquid monoammonium phosphate. The liquid monoammonium phosphate is concentrated and then output to the pH return tank 2 to obtain the mother liquor to be returned. Therefore, in this embodiment, the output end of the triple-effect purification device is connected to the input end of the concentration device, and the output end of the concentration device is connected to the first input end of the pH return tank 2.
[0048] More specifically, Figure 3 This paper demonstrates a complete chemical process for producing high-purity phosphoric acid from phosphate concentrate. First, the phosphate concentrate is ground and crushed, then reacted with hydrochloric acid to produce a crude phosphoric acid solution. This solution is then purified through a gravity settling tank and separator to remove large particles, yielding primary purified acid. Next, in the second purification stage, lime slurry is added to adjust the pH to an acidic range, promoting the formation of hydroxide precipitates from iron, aluminum, and other metal ions. The precipitate, containing phosphogypsum, is then separated by a pressure filtration unit, removing most of the heavy metals from the filtrate. The third purification stage employs ion exchange resin or organic solvent extraction technology to further adsorb residual magnesium, calcium, and other ions and separate trace impurities.
[0049] The denitrification unit uses high-temperature steam to react with nitrate ions in a vaporization reaction. The resulting nitrogen-containing gas is cooled and recovered by a condensation unit, and the condensate can be recycled to adjust the acid concentration. Finally, high-purity phosphoric acid undergoes a concentration process to remove excess water, yielding a finished product that meets food-grade or electronic-grade standards. Byproducts such as phosphogypsum and iron slag generated throughout the process can be used in building material production or metal recycling, achieving comprehensive resource utilization.
[0050] Furthermore, the triple-effect purification device also includes a purification agent feeding tank. The output end of the purification agent feeding tank is connected to the feeding end of the first purification unit, and a star-shaped feeder is provided at the bottom of the tank. Specifically, by adding a star-shaped feeder at the bottom of the feeding tank, uniform and continuous feeding is ensured, the addition amount is precisely controlled, thereby ensuring the liquid monoammonium phosphate index and ensuring that the purification agent is supplied to the first purification unit uniformly and stably.
[0051] Furthermore, the denitrification device includes a first denitrification unit, a second denitrification unit, a filter press unit, and a third denitrification unit;
[0052] The input end of the first denitrification unit is connected to the output end of the decalcification device, the first output end of the first denitrification unit is connected to the input end of the second denitrification unit, the first output end of the second denitrification unit is connected to the input end of the filter press unit, the first output end of the filter press unit is connected to the input end of the third denitrification unit, and the first output end of the third denitrification unit is connected to the input end of the triple-effect purification device.
[0053] Specifically, refer to Figure 2 As can be seen, the denitrification device includes three stages of denitrification units. Each stage of denitrification is heated by steam and then transferred to the next stage. The third denitrification unit processes the crude phosphoric acid, which is then used for subsequent purification steps to obtain the mother liquor to be returned. In the embodiments of this application, a filter press unit is also provided between the second and third denitrification units to separate solid impurities generated during the denitrification process.
[0054] Furthermore, the denitrification device also includes a condensation unit;
[0055] The condensation unit is configured in correspondence with the denitrification device, and the second output terminal of each denitrification unit in the denitrification device is connected to the input terminal of a condensation unit.
[0056] Specifically, by setting up a condensation unit for each denitrification unit, the volatile or condensable products generated during the heating process of denitrification are cooled down to condense the gaseous products (such as water vapor, unreacted steam, or low-boiling-point substances) into liquid, thereby removing the products in the reaction system, reducing the occurrence of reverse reactions, and improving denitrification efficiency.
[0057] Furthermore, this application embodiment also proposes that the second output end of the filter press unit is connected to the first input end of an external nitric acid phosphate fertilizer production device, and the output end of each condensation unit is connected to the second input end of the nitric acid phosphate fertilizer production device. That is, the acid residue obtained by the filter press unit and the dilute nitric acid obtained by the condensation unit can be used as raw materials for the production of nitric acid phosphate fertilizer, reducing costs and improving material utilization.
[0058] Furthermore, the output end of the purified phosphoric acid storage tank 3 is connected to the second input end of the pH return tank 2, so that the purified acid in the purified phosphoric acid tank is input into the pH return tank 2 and reacts with the mother liquor to be returned obtained in the aforementioned steps at a certain pH value, and finally obtains liquid monoammonium phosphate product, which is stored in the liquid monoammonium phosphate storage tank 4 set in the embodiment of this application.
[0059] The pH recovery tank 2 integrates an online pH monitoring device, which is used to monitor the pH value of the liquid monoammonium phosphate reaction solution in real time. This reduces manual measurement errors and allows for real-time monitoring of the pH value of the liquid monoammonium phosphate, ensuring that the pH value meets the usage standards of the new energy workshop. In this embodiment, the online pH monitoring device includes two online pH meters. The combined use of the two pH meters further improves the stability and reliability of the system.
[0060] The above is a detailed description of the preferred embodiments of this application. However, the invention of this application is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of this application. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.
Claims
1. A liquid monoammonium phosphate and ferric phosphate production system, characterized by, This includes a mother liquor treatment unit, a pH adjustment tank, a purified phosphate storage tank, a liquid monoammonium phosphate storage tank, and an iron phosphate production unit. The output end of the mother liquor treatment device is connected to the first input end of the pH return tank, and the output end of the purified phosphate storage tank is connected to the second input end of the pH return tank, for injecting purified phosphate and mother liquor to be returned into the pH return tank; The mixing reaction zone of the pH recovery tank is configured to neutralize the mother liquor to be recovered with purified phosphoric acid in a preset ratio to generate liquid monoammonium phosphate. The input end of the liquid monoammonium phosphate storage tank is connected to the output end of the pH adjustment tank, and the output end of the liquid monoammonium phosphate storage tank is connected to the raw material inlet of the iron phosphate production device. The iron phosphate production device is configured to synthesize iron phosphate using the liquid monoammonium phosphate as raw material.
2. The liquid monoammonium phosphate and ferric phosphate production system according to claim 1, characterized by, The pH adjustment tank is equipped with an online pH monitoring device, which is used to detect the pH value of the liquid monoammonium phosphate reaction solution in real time.
3. The liquid monoammonium phosphate and ferric phosphate production system according to claim 2, characterized by, The online pH monitoring device includes two online pH meters.
4. The liquid monoammonium phosphate and ferric phosphate production system according to claim 1, characterized by, The mother liquor treatment device includes a decalcification device, a denitrification device, and a triple-effect purification device; The input end of the decalcification device receives frozen mother liquor, and the output end of the decalcification device is connected to the input end of the denitrification device. The output end of the denitrification device is connected to the input end of the triple-effect purification device, and the output end of the triple-effect purification device is connected to the first input end of the pH return tank.
5. The liquid monoammonium phosphate and ferric phosphate production system according to claim 4, characterized in that, The triple-effect purification device includes a first purification unit, a second purification unit, and a third purification unit; The input terminal of the first purification unit is connected to the output terminal of the denitrification device, and the output terminal of the first purification unit is connected to the input terminal of the second purification unit. The output of the second purification unit is connected to the input of the third purification unit, and the output of the third purification unit is connected to the first input of the callback pH tank.
6. The liquid monoammonium phosphate and ferric phosphate production system according to claim 5, characterized in that, The triple-effect purification device also includes a purification agent feeding tank; The output end of the purifying agent feeding tank is connected to the feeding end of the first purification unit.
7. The liquid monoammonium phosphate and ferric phosphate production system according to claim 6, characterized in that, The bottom of the purifying agent feeding trough is equipped with a star-shaped feeder to ensure that the purifying agent is fed evenly and stably to the first purification unit.
8. The liquid monoammonium phosphate and ferric phosphate production system according to claim 4, characterized in that, The denitrification device includes a first denitrification unit, a second denitrification unit, a filter press unit, and a third denitrification unit; The input end of the first denitrification unit is connected to the output end of the decalcification device, the first output end of the first denitrification unit is connected to the input end of the second denitrification unit, the first output end of the second denitrification unit is connected to the input end of the filter press unit, the first output end of the filter press unit is connected to the input end of the third denitrification unit, and the first output end of the third denitrification unit is connected to the input end of the triple-effect purification device.
9. The liquid monoammonium phosphate and ferric phosphate production system according to claim 8, characterized in that, The denitrification device also includes a condensation unit; The condensation unit is configured in correspondence with the denitrification device, and the second output terminal of each denitrification unit in the denitrification device is connected to the input terminal of a condensation unit.
10. The liquid monoammonium phosphate and ferric phosphate production system according to claim 9, characterized in that, The second output end of the filter press unit is connected to the first input end of the external nitrate phosphate fertilizer production device, and the output end of each condensation unit is connected to the second input end of the nitrate phosphate fertilizer production device.