New energy material ferric phosphate green production system

Abstract

The utility model belongs to the technical field of new energy material production, and particularly relates to a green production system for new energy material ferric phosphate. The system comprises a nitric acid production unit (1), a ferric nitrate production unit (2), a ferric phosphate production unit (3), a neutralization unit (4), an evaporation and concentration unit (5) and a nitro compound fertilizer unit (6), the nitric acid production unit (1) is respectively communicated with the ferric nitrate production unit (2) and the neutralization unit (4); the ferric nitrate production unit (2) is communicated with the ferric phosphate production unit (3); the iron phosphate production unit (3) is communicated with the evaporation and concentration unit (5); the inlet end of the evaporation and concentration unit (5) is communicated with the neutralization unit (4), and the outlet end is communicated with the nitro compound fertilizer unit (6); and the evaporation and concentration unit (5) is communicated with the nitric acid production unit (1). According to the utility model, all elements are utilized, and zero emission is realized; the problem that calcium sulfate, ammonium sulfate or sodium nitrate and the like generated in the existing iron phosphate production process are difficult to digest in markets and environments is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of new energy material production, in particular to a green production system of new energy material iron phosphate. Background Art

[0002] At present, the development of new energy has been widely used and recognized. Usually, people often mention green new energy, which refers to the green use of alternative fuel vehicles. The green environmental protection issues in the production process of new energy materials are also gradually receiving attention.

[0003] Iron phosphate is an important raw material for new energy batteries. There are many production processes for iron phosphate, and there are also many methods for treating process by-products and waste liquids. Such as patents CN202210587400.1, CN202211172930.6, CN202211103720.1, CN112960662A, CN202210851059.6, CN207904011U, CN201911081604.2, 202110380493, CN202210890848.0, CN105417771B, etc.; these technologies have complex treatment processes, high environmental protection investment costs or low product value (such as the production of ammonium sulfate, sodium sulfate, etc.), and generally do not solve the problem of water balance.

[0004] Therefore, further research and development of the above technologies is needed to meet the green and environmental protection issues in the production process of new energy materials. Utility Model Content

[0005] The purpose of the utility model is to provide a green production system of iron phosphate, a new energy material, in view of the above technical problems. This is a technical solution suitable for nitric acid production enterprises to co-produce iron phosphate and nitro compound fertilizer. The technical solution is reasonably designed, and no pollutants or difficult-to-consume substances such as calcium sulfate, ammonium sulfate, and sodium nitrate are generated during the production process. The comprehensive utilization of all elements is achieved, and zero emissions are achieved. The nitro compound fertilizer produced is a bulk commodity with a large market demand, and has a strong market absorption capacity, which increases the added value of the product.

[0006] In order to achieve the purpose of the above utility model, the specific technical solution of the utility model is:

[0007] A green production system of new energy material iron phosphate, the system comprises a nitric acid production unit, a ferric nitrate production unit, an iron phosphate production unit, a neutralization unit, an evaporation concentration unit and a nitro-compound fertilizer unit; wherein the nitric acid production unit is connected with the ferric nitrate production unit and the neutralization unit respectively; the ferric nitrate production unit is connected with the iron phosphate production unit; the iron phosphate production unit is connected with the evaporation concentration unit; the inlet end of the evaporation concentration unit is connected with the neutralization unit, and the outlet end is connected with the nitro-compound fertilizer unit; the evaporation concentration unit is connected with the nitric acid production unit.

[0008] Furthermore, in the green production system of iron phosphate, a new energy material, the inlet end of the nitric acid production unit and the neutralization unit are connected to the ammonia raw material device. The nitric acid production unit uses ammonia oxidation to produce nitric acid, and a double-pressurization method nitric acid production device is used; this technology is an existing mature technology and will not be described in detail.

[0009] Furthermore, in the green production system of iron phosphate, a new energy material, the inlet end of the iron nitrate production unit is connected to the pure iron raw material device. The iron nitrate production unit is a production unit that adds pure iron particles to nitric acid to react and generate iron nitrate; it includes an intermittent iron nitrate production device and a continuous iron nitrate production device. The iron nitrate production process involved is a production process that adds pure iron particles to nitric acid to react and generate iron nitrate; this technology is also an existing mature technology and will not be repeated.

[0010] Furthermore, in the green production system of iron phosphate, a new energy material, the inlet end of the iron phosphate production unit is connected to the phosphoric acid raw material device and the ammonia raw material device, respectively. The outlet end of the iron phosphate production unit is connected to the iron phosphate output device. The process for producing iron phosphate in the iron phosphate production unit is prior art and will not be described in detail. The specific iron phosphate production process is: phosphoric acid, ferric nitrate solution, and ammonia are used as raw materials to continuously react to generate iron phosphate; in the process, attention should be paid to the excess of phosphoric acid and ammonia relative to iron to ensure complete separation of iron precipitation and avoid iron elements being brought to the subsequent process to affect the quality of nitro compound fertilizer. The filtration and washing of iron phosphate are carried out continuously, and the continuous process can ensure the stability of the subsequent process and better guarantee the product quality of iron phosphate.

[0011] Furthermore, in the green production system of iron phosphate, a new energy material, the process involved in the neutralization unit is a neutralization process of nitric acid and ammonia, and the unit can also be realized by existing technology. In the specific operation, the matching of iron phosphate production capacity and nitro fertilizer production capacity and the flexible adjustment of production load should be ensured.

[0012] Furthermore, in the green production system of iron phosphate, a new energy material, the inlet of the nitro compound fertilizer unit is connected to the potash fertilizer raw material device. The outlet of the nitro compound fertilizer unit is connected to the nitro compound fertilizer output device. In the unit, an appropriate amount of potash fertilizer or other nutrients is added to ensure that the nitrogen, phosphorus and potassium required for crop growth and the relevant product quality standards are met. The nitro compound fertilizer preferably adopts a high tower granulation process.

[0013] Furthermore, in the green production system of the new energy material iron phosphate, a filter press device and a washing device are provided in the iron phosphate production unit, and the outlets of the filter press device and the washing device are connected to the evaporation concentration unit.

[0014] Furthermore, in the green production system of the new energy material iron phosphate, the evaporation concentration unit adopts a continuous concentration process; with better system stability; the condensate obtained by concentration is returned to the nitric acid process as nitric acid absorption process water to achieve zero emissions.

[0015] The working principle of the utility model is as follows: the nitric acid production unit uses ammonia as raw material and produces nitric acid through ammonia oxidation and water absorption; the iron nitrate production unit is connected to the nitric acid pipeline from the nitric acid production unit and transported to the iron nitrate production unit to react with iron to generate iron nitrate solution; the iron nitrate solution is transported to the iron phosphate production unit through a pipeline to react with phosphoric acid and ammonia to generate iron phosphate products as new energy materials, and the byproducts in the unreacted system and the monoammonium phosphate and ammonium nitrate solutions produced by washing the iron phosphate are transported to the evaporation and concentration unit through a pipeline, and the materials after evaporation and concentration are sent to the compound fertilizer unit to be mixed with potash fertilizer in an appropriate proportion to produce nitro compound fertilizer; the evaporated condensed water returns to the nitric acid system as water for nitric acid production to absorb nitrogen oxides. Thus, the whole process of full element utilization and zero emission is realized; the problem of the market and environment being difficult to digest products such as calcium sulfate, ammonium sulfate, or sodium nitrate produced in the existing iron phosphate production process is solved.

[0016] Compared with the prior art, the positive effects of the utility model are embodied in:

[0017] (I) Ammonia oxidation to produce nitric acid, nitric acid to produce iron nitrate, iron nitrate to produce iron phosphate, iron phosphate production by-products and concentrates in washing water are used to make nitro compound fertilizer, and the condensate is returned to nitric acid for absorption and reuse. The comprehensive utilization of all elements is achieved, and zero emissions are achieved. The nitro compound fertilizer produced is a bulk commodity with a large market demand, with a strong market absorption capacity, which increases the added value of the product.

[0018] (2) The device has good continuity, stability and operational flexibility, which can better ensure green environmental protection; the production efficiency is high and the product quality is easier to guarantee.

[0019] (III) The system does not use ferric sulfate or ferrous sulfate, thus solving the problem of low added value of ammonium sulfate or calcium sulfate that is usually used in existing methods.

[0020] (IV) The system does not use the process of neutralizing with alkali to produce sodium nitrate. This is because sodium nitrate is a relatively niche industrial product compared to nitro-compound fertilizers, and its market capacity is limited, making it difficult for the by-product sodium nitrate to be absorbed by the market.

[0021] (V) This system realizes the full reuse of evaporated condensed water, truly achieving zero emissions.

[0022] (VI) The system recycles materials to produce nitro-complex fertilizer, which has good economic efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic structural diagram of a green production system for iron phosphate, a new energy material, described in the utility model.

[0024] Among them, 1 is nitric acid production unit; 2 is ferric nitrate production unit; 3 is ferric phosphate production unit; 4 is neutralization unit; 5 is concentration unit; 6 is compound fertilizer unit; A is ammonia; B is pure iron; C is phosphoric acid; D is nitric acid; E is dilute nitric acid; F is condensate; G is filtrate; H is washing liquid; I is concentrated liquid; J is potash fertilizer; K is ferric phosphate; L is nitro compound fertilizer; M is ferric nitrate. DETAILED DESCRIPTION

[0025] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0026] It should be noted that, in order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Generally, the components of the embodiment of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0029] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0030] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0031] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In addition, the present utility model should point out that, in the present utility model, if the specific structure, connection relationship, position relationship, power source relationship, etc. are not specifically written out, the structure, connection relationship, position relationship, power source relationship, etc. involved in the present utility model are all known by technical personnel in this field on the basis of existing technology without creative work.

[0033] Embodiment 1:

[0034] A green production system of new energy material iron phosphate, the system comprises a nitric acid production unit 1, a ferric nitrate production unit 2, an iron phosphate production unit 3, a neutralization unit 4, an evaporation concentration unit 5 and a nitro-compound fertilizer unit 6; wherein the nitric acid production unit 1 is connected with the ferric nitrate production unit 2 and the neutralization unit 4 respectively; the ferric nitrate production unit 2 is connected with the iron phosphate production unit 3; the iron phosphate production unit 3 is connected with the evaporation concentration unit 5; the inlet end of the evaporation concentration unit 5 is connected with the neutralization unit 4, and the outlet end is connected with the nitro-compound fertilizer unit 6; the evaporation concentration unit 5 is connected with the nitric acid production unit 1.

[0035] In a green production system of new energy material iron phosphate, the inlet end of the nitric acid production unit 1 and the neutralization unit 4 are connected to the ammonia raw material device. The nitric acid production unit 1 adopts a double-pressurization nitric acid production device, that is, ammonia is oxidized by air and then enters the energy recovery and water absorption device to generate nitric acid, and the nitrogen oxide gas and tail gas are pressurized and energy recovered by the four-in-one unit. The designed process is a mature double-pressurization nitric acid production process, which is not described in detail here.

[0036] In a green production system of new energy material iron phosphate, the inlet end of the iron nitrate production unit 2 is connected to the pure iron raw material device. The iron nitrate production unit 2 is a production unit that adds pure iron particles to nitric acid to react and generate iron nitrate; it includes an intermittent iron nitrate production device and a continuous iron nitrate production device, which are also prior art and will not be described in detail.

[0037] In this unit, the nitric acid produced by the nitric acid production unit is metered and then enters the ferric nitrate reactor. Pure iron and catalyst are added, the reaction temperature is controlled, the generation of ferrous iron is controlled, and ferric nitrate solution is obtained. Ferric nitrate enters the next process in a solution state without crystallization treatment, which can reduce the concentration and packaging required for crystallization, which is complicated and easy to introduce pollutants, thus ensuring quality and reducing production costs.

[0038] In a green production system of new energy material iron phosphate, the inlet end of the iron phosphate production unit 3 is connected to the phosphoric acid raw material device and the ammonia raw material device respectively. The outlet end of the iron phosphate production unit 3 is connected to the iron phosphate output device. A filter press device and a washing device are provided in the iron phosphate production unit 3, and the outlets of the filter press device and the washing device are connected to the evaporation concentration unit 5.

[0039] In the iron phosphate production unit, ferric nitrate enters the system in the form of solution, and enters the continuous reactor after being metered with raw materials phosphoric acid and ammonia. The ferric phosphate exiting the continuous reactor is continuously filtered and washed to obtain dihydrate ferric phosphate, which is further dried and roasted to obtain battery-grade ferric phosphate. Ferric nitrate enters the system in the form of solution, which can be transported by a pump and metered by a flow meter, reducing the trouble of opening barrels and pouring materials for crystallized materials, saving labor costs, and avoiding the introduction of impurities and pollutants during operations such as opening barrels and pouring materials. Cost savings and quality assurance. Filtration and washing are both continuous operations, greatly improving production efficiency.

[0040] In a green production system of new energy material iron phosphate, a medium-pressure neutralization process is preferably used in the neutralization unit, during which a neutralization reaction of nitric acid and ammonia is achieved to generate a dilute ammonium nitrate solution; the process is as described in patent CN 200910058766 and will not be repeated here.

[0041] In a green production system of new energy material iron phosphate, the evaporation concentration unit can use a method that combines membrane concentration with evaporation concentration to concentrate ammonium nitrate liquid and recover lithium iron phosphate filtrate and washing liquid at a lower cost; the separated clear liquid and condensate are returned to the nitric acid unit as water for the nitric acid absorption process, thereby achieving zero process emissions.

[0042] In a green production system of iron phosphate, a new energy material, the inlet end of the nitro compound fertilizer unit (6) is connected to a potash fertilizer raw material device. The outlet end of the nitro compound fertilizer unit 6 is connected to a nitro compound fertilizer output device. A certain amount of potash fertilizer is added to the liquid from the evaporation concentration unit to obtain a ternary system of nitrogen, phosphorus and potassium slurry, and the concentrated material is evaporated twice and then subjected to high tower granulation to obtain a ternary high tower granulated compound fertilizer.

[0043] The green production system of new energy material iron phosphate recorded in the utility model uses ammonia oxidation to produce nitric acid, nitric acid to produce iron nitrate, iron nitrate to produce iron phosphate, iron phosphate production by-products and concentrates in washing water to make nitro compound fertilizer, and the condensate is returned to nitric acid for absorption and reuse. The comprehensive utilization of all elements is achieved, and zero emissions are achieved. The produced nitro compound fertilizer is a bulk commodity with a large market demand, has a strong market absorption capacity, and increases the added value of the product.

[0044] The basic examples and further selected examples in the above utility model can be freely combined to form multiple embodiments, which are all embodiments that can be adopted and claimed for protection in the utility model. In the scheme of the utility model, each selected example can be arbitrarily combined with any other basic example and selected example. Those skilled in the art will know that there are many combinations.

[0045] The above-mentioned embodiments only express the specific implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the protection scope of the present application. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the technical solution concept of the present application, and these all belong to the protection scope of the present application.

[0046] This background technology section is provided to generally present the context of the present invention, and the work of the currently named inventor, the work to the extent described in this background technology section, and aspects of the description in this section that did not constitute prior art at the time of application are neither explicitly nor implicitly admitted to be prior art of the present invention.

Claims

1. A green production system for new energy material iron phosphate, characterized by: The system comprises a nitric acid production unit (1), a ferric nitrate production unit (2), a ferric phosphate production unit (3), a neutralization unit (4), an evaporation concentration unit (5) and a nitro compound fertilizer unit (6); wherein the nitric acid production unit (1) is connected to the ferric nitrate production unit (2) and the neutralization unit (4) respectively; the ferric nitrate production unit (2) is connected to the ferric phosphate production unit (3); the ferric phosphate production unit (3) is connected to the evaporation concentration unit (5); the inlet end of the evaporation concentration unit (5) is connected to the neutralization unit (4), and the outlet end is connected to the nitro compound fertilizer unit (6); and the evaporation concentration unit (5) is connected to the nitric acid production unit (1).

2. A green production system of new energy material iron phosphate as claimed in claim 1, characterized in that: The inlet end of the nitric acid production unit (1) and the neutralization unit (4) are both connected to the ammonia raw material device.

3. A green production system of new energy material iron phosphate as claimed in claim 1, characterized in that: The inlet end of the ferric nitrate production unit (2) is connected to the pure iron raw material device.

4. A green production system of new energy material iron phosphate as claimed in claim 1, characterized in that: The inlet end of the iron phosphate production unit (3) is connected to a phosphoric acid raw material device and an ammonia raw material device respectively.

5. A green production system of new energy material iron phosphate as claimed in claim 1, characterized in that: The inlet end of the nitro compound fertilizer unit (6) is connected to a potash fertilizer raw material device.

6. A green production system of new energy material iron phosphate as claimed in claim 1 or 2, characterized in that: The nitric acid production unit (1) is a double-pressure nitric acid production device.

7. A green production system of new energy material iron phosphate as claimed in claim 1 or 3, characterized in that: The ferric nitrate production unit (2) is a production unit in which pure iron particles are added to nitric acid to react and generate ferric nitrate; it includes an intermittent ferric nitrate production device and a continuous ferric nitrate production device.

8. A green production system of new energy material iron phosphate as claimed in claim 1 or 4, characterized in that: A filter press device and a washing device are provided in the iron phosphate production unit (3), and the outlets of the filter press device and the washing device are connected to the evaporation concentration unit (5).

9. A green production system of new energy material iron phosphate as claimed in claim 1 or 5, characterized in that: The outlet end of the nitro-compound fertilizer unit (6) is connected to the nitro-compound fertilizer output device.

10. A green production system of new energy material iron phosphate as claimed in claim 8, characterized in that: The outlet end of the iron phosphate production unit (3) is connected to the iron phosphate output device.

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