System for preparing ammonium phosphate and byproduct nitrophosphate fertilizer by decomposing phosphorite with sulfuric acid
The system for preparing ammonium phosphate by-product nitric acid fertilizer by sulfuric acid decomposition is solved, and the problems of low resource utilization and environmental pollution in monoammonium phosphate production are realized, the by-product reuse is achieved, and the resource utilization and environmental protection effect are improved.
Patent Information
- Application Number
- CN202422472821.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-12
- Publication Date
- 2025-09-02
- Estimated Expiration
- 2034-10-12
AI Technical Summary
There are problems of low resource utilization, serious environmental pollution and difficult handling of by-products in the production process of monoammonium phosphate.
Through a system for preparing ammonium phosphate by-product nitric acid fertilizer by-product through sulfuric acid decomposition phosphate ore, including acid dissolution, separation, extraction and other processes, the by-product white fertilizer is converted into valuable nitric acid fertilizer, and the effective utilization of phosphate ore resources and the reuse of by-products are achieved.
It improves the extraction rate of useful ingredients in phosphate ores, reduces environmental pollution, and improves the economic benefits and environmental protection image of the enterprise.
Smart Images
Figure CN223292303U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of phosphate rock processing, and in particular to a system for decomposing phosphate rock with sulfuric acid to produce ammonium phosphate as a by-product of nitric phosphate fertilizer. Background Art
[0002] In the phosphorus chemical industry, the efficient utilization of phosphorus resources and environmental protection have always been key issues in the industry's development. With the rapid development of agriculture, new energy, and other fields, demand for phosphorus chemical products such as monoammonium phosphate (MAP) is growing. As a key industrial raw material, MAP is widely used in agricultural fertilizers, new energy materials (such as lithium iron phosphate), and other fields. Its production efficiency and product quality are directly related to the sustainable development of downstream industries.
[0003] Currently, the production of monoammonium phosphate (MAP) primarily involves decomposing phosphate rock with sulfuric acid. This method involves the acidolysis of phosphate rock with sulfuric acid to produce phosphoric acid and its corresponding byproducts. This is then followed by a series of complex process steps, including extraction, separation, purification, concentration, and crystallization, to ultimately produce the MAP product. However, this production process still presents the following technical challenges that urgently need to be addressed:
[0004] 1. Low resource utilization
[0005] Traditional processes often result in resource waste during the decomposition and subsequent processing of phosphate rock. For example, the useful components in the phosphate rock cannot be fully extracted, resulting in low overall resource utilization.
[0006] 2. Severe environmental pollution
[0007] If waste residues, wastewater and other pollutants generated during the acid hydrolysis reaction and subsequent treatment are not handled properly, they will have serious impacts on the environment, such as water pollution and soil acidification.
[0008] 3. Difficulty in handling by-products
[0009] The production of monoammonium phosphate (MAP) generates a large number of by-products, such as phosphogypsum and white fertilizer. The treatment and utilization of these by-products has always been a challenge in the industry. Failure to effectively handle them will severely impact the economic benefits and environmental image of the company.
[0010] To this end, the present application provides a system for decomposing phosphate rock with sulfuric acid to produce ammonium phosphate as a by-product nitric phosphate fertilizer. Utility Model Content
[0011] In order to overcome the shortcomings of the existing technology, the present application provides a system for preparing ammonium phosphate as a by-product nitric acid phosphate fertilizer by decomposing phosphate rock with sulfuric acid. By using corresponding equipment to carry out a series of physical and chemical processes such as acid hydrolysis reaction, separation and extraction, the originally difficult-to-handle by-product white fertilizer is converted into valuable nitric acid phosphate fertilizer, thereby realizing the effective utilization of phosphate rock resources and the recycling of by-products.
[0012] The beneficial effects of this application are:
[0013] A system for producing ammonium phosphate as a by-product of nitric phosphate fertilizer by decomposing phosphate rock with sulfuric acid comprises an acidolysis tank connected to a first separator, the first separator connected to a purification tank, the purification tank connected to a second separator, the second separator connected to a first concentrator, the first concentrator connected to a first crystallizer, and the first crystallizer connected to a third separator;
[0014] The second separator and the third separator are connected to a reslurry tank, the reslurry tank is connected to a neutralization tank, and the neutralization tank is connected to a fourth concentrator.
[0015] In some embodiments, the third separator is further connected to a dryer.
[0016] In some embodiments, the fourth concentrator is connected to a granulation and drying device, and the granulation and drying device is further connected to a sifter.
[0017] In some embodiments, the sifter is connected to a pulverizer, which is connected to a granulation and drying device.
[0018] In some embodiments, the first separator is connected to a second concentrator, the second concentrator is connected to an extraction tank, the extraction tank is connected to a stripping tank, and the stripping tank is connected to a third concentrator.
[0019] In some embodiments, the third concentrator is connected to a decolorization tank.
[0020] In some specific embodiments, the acid hydrolysis tank is used to perform an acid hydrolysis reaction between sulfuric acid and phosphate rock.
[0021] In some specific embodiments, the reslurry tank is used to receive the white fertilizer separated by the second separator and the third separated liquid separated by the third separator.
[0022] In some specific embodiments, the first separator is used to separate phosphogypsum and a first separated liquid.
[0023] In some specific embodiments, the third concentrator is used for concentrating to produce industrial phosphoric acid.
[0024] The beneficial effects of this application are:
[0025] 1. The system described in this application prepares industrial phosphoric acid from the first separated liquid obtained by the first separator through concentration, extraction, desulfurization, washing, stripping, concentration, deweighting and decolorization, thereby increasing the extraction rate of useful components in phosphate rock and significantly improving resource utilization.
[0026] 2. The system described in this application realizes the reuse of the by-product white fertilizer through the re-pulping and neutralization process, produces nitric acid phosphate fertilizer, solves the problem of by-product treatment, and improves the economic benefits and environmental image of the enterprise.
[0027] 3. The system described in this application effectively treats waste residue and wastewater, reducing environmental pollution, especially the risk of water pollution and soil acidification. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] The present application is further described below with reference to the accompanying drawings and examples.
[0029] Figure 1 This is a schematic structural diagram of a system for preparing ammonium phosphate as a by-product of nitric phosphate fertilizer by decomposing phosphate rock with sulfuric acid as described in the present application;
[0030] Figure 2 This is another structural schematic diagram of a system for preparing ammonium phosphate as a by-product of nitric phosphate fertilizer by decomposing phosphate rock with sulfuric acid as described in this application;
[0031] Figure 3 This is a schematic diagram of the material flow during operation of a system for preparing ammonium phosphate as a by-product of nitric phosphate fertilizer by decomposing phosphate rock with sulfuric acid as described in this application;
[0032] Among them: 101, acid hydrolysis tank; 102, first separator; 201, purification tank; 202, second separator; 203, first concentrator; 204, first crystallizer; 205, third separator; 206, dryer; 301, reslurry tank; 302, neutralization tank; 303, fourth concentrator; 304, granulation and drying equipment; 305, sifter; 306, crusher; 401, second concentrator; 402, extraction tank; 403, stripping tank; 404, third concentrator; 405, decolorization tank. DETAILED DESCRIPTION
[0033] The following will clearly and completely describe the concept, specific structure and technical effects of this application in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments of this application, other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application. In addition, all the connection / connection relationships involved in the patent do not refer to the direct connection of components, but refer to the formation of a better connection structure by adding or reducing connection accessories according to the specific implementation situation. The various technical features created in this application can be combined interactively without conflicting with each other.
[0034] like Figure 1As shown, a system for preparing ammonium phosphate as a by-product of nitric phosphate fertilizer by decomposing phosphate rock with sulfuric acid includes an acid decomposition tank 101,
[0035] The acid hydrolysis tank 101 is connected to the first separator 102, the first separator 102 is connected to the purification tank 201, the purification tank 201 is connected to the second separator 202, the second separator 202 is connected to the first concentrator 203, the first concentrator 203 is connected to the first crystallizer 204, and the first crystallizer 204 is connected to the third separator 205;
[0036] The second separator 202 and the third separator 205 are connected to a reslurry tank 301 , the reslurry tank 301 is connected to a neutralization tank 302 , and the neutralization tank 302 is connected to a fourth concentrator 303 .
[0037] Specifically, in an acid hydrolysis tank, sulfuric acid reacts with phosphate rock to produce an acid hydrolysis solution and corresponding phosphogypsum; the phosphogypsum and phosphoric acid are separated by a first separator to obtain phosphogypsum and a first separated liquid; the first separated liquid is introduced into a purification tank, ammonia is added for purification, and purified to obtain a purified liquid; the purified liquid is introduced into a second separator for separation to obtain a second separated liquid and white fertilizer; the second separated liquid is introduced into a first concentrator for concentration to obtain a first concentrated liquid; the first concentrated liquid is introduced into a first crystallizer for crystallization to obtain a first crystallized liquid; the first crystallized liquid is introduced into a third separator for separation to obtain a third separated liquid and monoammonium phosphate crystals;
[0038] The white fertilizer and the third separated liquid are introduced into a reslurry tank, nitric acid is added thereto for reslurry treatment, and a reslurry liquid is obtained; the reslurry liquid is introduced into a neutralization tank, ammonia is added thereto for neutralization treatment, and a neutralized liquid is obtained; the neutralized liquid is introduced into a fourth concentrator for concentration treatment, and a fourth concentrated liquid is obtained;
[0039] Specifically, the third separated liquid is a filtrate containing phosphate; and the fourth concentrated liquid is a concentrated liquid containing nitrophosphate fertilizer.
[0040] Specifically, the acid hydrolysis tank is used to hydrolyze sulfuric acid with phosphate rock to produce an acid hydrolysis solution and phosphogypsum. The acid hydrolysis tank can be, for example, an acid hydrolysis reactor or an acid hydrolysis kettle, or other suitable equipment can be selected based on actual conditions to meet the requirements of the acid hydrolysis reaction.
[0041] The first separator is used to separate the phosphogypsum from the first separated liquid after acid hydrolysis. The first, second, and third separators can be, for example, solid-liquid separators, filter presses, or centrifuges. Other suitable equipment can also be used based on actual conditions, as long as it meets the requirements for solid-liquid separation.
[0042] In the purification tank, ammonia gas is added to purify the first separated liquid to produce a purified feed liquid. The purification tank can be a purification reactor or a neutralization tank, or other corresponding equipment can be selected according to actual conditions to meet the purification requirements.
[0043] The second separator is used to separate and purify the feed liquid to obtain a second separated liquid and white fertilizer.
[0044] The first concentrator, the first crystallizer, and the third separator are used for concentration, crystallization, and separation in sequence, and ultimately obtain monoammonium phosphate crystals and the third separated liquid.
[0045] The repulping tank receives the white fertilizer and the third separation liquid for repulping.
[0046] The neutralization tank receives ammonia gas and adds it to the slurry liquid for neutralization.
[0047] The fourth concentrator concentrates the neutralized liquid to obtain a concentrated liquid containing nitrophosphate fertilizer.
[0048] In some embodiments, the third separator 205 is further connected to a dryer 206 .
[0049] Specifically, the monoammonium phosphate crystals obtained by the third separator are introduced into a dryer for drying to obtain phosphate solids.
[0050] In some embodiments, the fourth concentrator 303 is connected to a granulation and drying device 304 , and the granulation and drying device 304 is further connected to a sifter 305 .
[0051] Specifically, the fourth concentrated liquid is concentrated in the fourth concentrator to obtain a fourth concentrated liquid, which is introduced into a granulation and drying device for granulation and drying to obtain dry nitrophosphate fertilizer particles, and the dried nitrophosphate fertilizer particles are introduced into a sifter for sieving to obtain nitrophosphate fertilizer particles with a qualified particle size.
[0052] In some embodiments, the sifter 305 is connected to a pulverizer 306 , and the pulverizer 306 is connected to the granulation and drying device 304 .
[0053] Specifically, the dried nitrophosphate fertilizer particles are introduced into a sifter for screening, and the nitrophosphate fertilizer particles with unqualified particle size are introduced into a crusher for crushing, and then introduced into a granulation and drying equipment for granulation and drying.
[0054] Therefore, in the present application, the granulation drying equipment, the screener, and the pulverizer are used to prepare the fourth concentrated liquid into dry nitrophosphate fertilizer granules, and perform screening and pulverization processes.
[0055] like Figure 2As shown, in some embodiments, the first separator 102 is connected to the second concentrator 401 , the second concentrator 401 is connected to the extraction tank 402 , the extraction tank 402 is connected to the stripping tank 403 , and the stripping tank 403 is connected to the third concentrator 404 .
[0056] Specifically, the first separated liquid obtained by the first separator is introduced into the second concentrator for concentration to increase the concentration to obtain a second concentrated liquid; the second concentrated liquid is introduced into the extraction tank for extraction to obtain an extracted oil layer; the extracted oil layer is introduced into the desulfurization tank for desulfurization to obtain a desulfurized extracted oil layer; the desulfurized extracted oil layer is introduced into the stripping tank for stripping to obtain a stripping water layer, and the stripping water layer is introduced into the third concentrator for concentration to obtain a third concentrated liquid, wherein the third concentrated liquid contains phosphoric acid.
[0057] In some embodiments, the third concentrator 404 is connected to a decolorization tank 405 .
[0058] Specifically, the third concentrated liquid is concentrated in the third concentrator to obtain a third concentrated liquid, which is first introduced into a deweighting tank for deweighting, and then introduced into a decoloring tank for decoloring to obtain industrial phosphoric acid.
[0059] Specifically, the extraction tank and the stripping tank may be, for example, an extractor or an extraction tank, or other corresponding equipment may be selected according to actual conditions, as long as the extraction and stripping requirements are met.
[0060] The first concentrator, the second concentrator, the third concentrator, and the fourth concentrator may be, for example, a concentration kettle, or other corresponding equipment may be selected according to actual conditions, as long as the requirements of the concentration treatment are met.
[0061] The first crystallizer can be, for example, a crystallization kettle, or other corresponding equipment can be selected according to actual conditions, as long as the requirements of the crystallization treatment are met.
[0062] The dryer may be a dryer or an oven, or other corresponding equipment may be selected according to actual conditions, as long as the requirements of the drying process are met.
[0063] The reslurry tank may be, for example, a reslurry tank or a mixing tank, or other corresponding equipment may be selected according to actual conditions, as long as the requirements for the reslurry treatment are met.
[0064] The neutralization tank may be, for example, a neutralization reactor, or other corresponding equipment may be selected according to actual conditions, as long as the requirements of the neutralization treatment are met.
[0065] The granulation and drying equipment may be an all-in-one granulation and drying machine, or other corresponding equipment may be selected according to the actual situation so long as the requirements of granulation and drying are met.
[0066] like Figure 3As shown, the system described in this application has the following specific operating process:
[0067] Acid hydrolysis and separation: Sulfuric acid reacts with phosphate rock in the acid hydrolysis tank to produce acid hydrolysis solution and phosphogypsum. The phosphogypsum is separated by the first separator.
[0068] Purification treatment: The first separated liquid enters the purification tank and is purified by ammonia.
[0069] Concentration, crystallization and separation: The purified liquid in the purification tank is separated by the second separator, and the obtained second separated liquid enters the first concentrator for concentration, then crystallizes in the first crystallizer, and finally separates by the third separator.
[0070] Reslurry and neutralization: The white fertilizer and the third separated liquid are mixed in the reslurry tank, and the obtained reslurry liquid is neutralized by ammonia in the neutralization tank.
[0071] Concentration and granulation: The liquid neutralized in the neutralization tank is concentrated in the fourth concentrator, and the concentrated liquid is made into granules in the granulation drying equipment, and the particle size is adjusted by a sifter and a crusher.
[0072] The above is a specific description of the preferred implementation of the present application, but the invention of the present application is not limited to the described embodiments. Technical personnel familiar with the art can also make various equivalent modifications or substitutions without violating the spirit of the present application. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present application.
Claims
1. A system for decomposing phosphate rock with sulfuric acid to produce ammonium phosphate as a by-product of nitrophosphate fertilizer, characterized in that: The invention comprises an acidolysis tank (101), wherein the acidolysis tank (101) is connected to a first separator (102), the first separator (102) is connected to a purification tank (201), the purification tank (201) is connected to a second separator (202), the second separator (202) is connected to a first concentrator (203), the first concentrator (203) is connected to a first crystallizer (204), and the first crystallizer (204) is connected to a third separator (205); The second separator (202) and the third separator (205) are connected to a reslurry tank (301), the reslurry tank (301) is connected to a neutralization tank (302), and the neutralization tank (302) is connected to a fourth concentrator (303).
2. The system according to claim 1, wherein: The third separator (205) is also connected to a dryer (206).
3. The system according to claim 1, wherein: The fourth concentrator (303) is connected to a granulation drying device (304), and the granulation drying device (304) is further connected to a sifter (305).
4. The system according to claim 3, characterized in that The sifter (305) is connected to a pulverizer (306), and the pulverizer (306) is connected to a granulation and drying device (304).
5. The system according to claim 1, wherein: The first separator (102) is connected to the second concentrator (401), the second concentrator (401) is connected to the extraction tank (402), the extraction tank (402) is connected to the stripping tank (403), and the stripping tank (403) is connected to the third concentrator (404).
6. The system according to claim 5, characterized in that The third concentrator (404) is connected to a decolorization tank (405).
7. The system according to claim 1, wherein: The acid hydrolysis tank (101) is used for acid hydrolysis reaction of sulfuric acid and phosphate rock.
8. The system according to claim 1, wherein: The reslurry tank (301) is used to receive the white fertilizer separated by the second separator (202) and the third separated liquid separated by the third separator (205).
9. The system according to claim 1, wherein: The first separator (102) is used to separate phosphogypsum and a first separation liquid.
10. The system according to claim 5, wherein: The third concentrator (404) is used for concentrating to produce industrial phosphoric acid.