High-purity ammonia water preparation device in rare earth smelting industry

Abstract

The utility model discloses a high-purity ammonia water preparation device in the rare earth smelting industry, which comprises a liquid ammonia vaporizer, a liquid ammonia inlet and a liquid ammonia outlet, an inlet of the precision filter is communicated with a discharge hole of the liquid ammonia vaporizer through a pipeline; an inlet of the washing tower is communicated with the precision filter and the liquid ammonia vaporizer blow-off valve through pipelines; an inlet of the ammonia water preparation device is communicated with the washing tower through a pipeline; an ammonia water circulating pipeline on the ammonia water preparation device penetrates through the inside of the ammonia water cooler; an inlet of the tail gas absorption tank is fixedly communicated with a deionized water conveying pipe, a make-up pump is fixedly mounted on the deionized water conveying pipe, and the tail gas absorption tank is communicated with the ammonia water preparation device through a pipeline, so that the reaction purity and effect of rare earth smelting are improved, energy can be effectively recycled, and the production cost is reduced; the method has the characteristics of high preparation purity, stable and adjustable concentration, low energy consumption and high safety coefficient.

Description

TECHNICAL FIELD

[0001] The utility model relates to high -purity ammonia water preparation technical field, concretely is high -purity ammonia water preparation device of rare earth smelting industry. BACKGROUND

[0002] In the field of rare earth smelting, ammonia water as a kind of key chemical raw material, its quality and supply stability plays a decisive role in the entire production process. The traditional ammonia water preparation process gradually shows many limitations in meeting the growing demand of modern rare earth smelting.

[0003] Product quality is a big short board of traditional preparation process, on the one hand, due to lack of efficient impurity removal means, in the process of converting liquid ammonia into ammonia gas, the rust, dust and other solid impurities carried in liquid ammonia are easily mixed into gaseous ammonia, after subsequent preparation into ammonia water, these impurities still remain in it, seriously affect the reaction purity and effect of rare earth smelting, on the other hand, the traditional process has insufficient purification capacity for soluble impurities in ammonia gas, such as trace amount of acid gas, alkaline impurities, further reduces the quality of ammonia water. Furthermore, the traditional liquid ammonia preparation method due to low thermal efficiency in the reaction process, poor equipment heat preservation performance and lack of effective energy recovery utilization mechanism, so that a large amount of energy is consumed in the preparation of ammonia water process, increases the production cost. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a kind of high -purity ammonia water preparation device of rare earth smelting industry, solve the ammonia water preparation device of prior art in the process of converting liquid ammonia into ammonia gas, rust, dust and other solid impurities carried in liquid ammonia are easily mixed into gaseous ammonia, after subsequent preparation into ammonia water, these impurities still remain in it, seriously affect the reaction purity and effect of rare earth smelting, and the traditional liquid ammonia preparation method due to low thermal efficiency in the reaction process, poor equipment heat preservation performance and lack of effective energy recovery utilization mechanism, so that a large amount of energy is consumed in the preparation of ammonia water process, increases the production cost problem.

[0005] The utility model discloses a high -purity ammonia water preparation device of rare earth smelting industry, including: the liquid ammonia vaporizer for rare earth smelting industry high -purity ammonia water raw material extraction, its import fixed connection has the liquid ammonia delivery pipe, the import of precision filter is communicated with the liquid ammonia vaporizer discharge port through pipeline, the import of washing tower is communicated with precision filter, liquid ammonia vaporizer diffusion valve respectively through pipeline, the import of ammonia water preparation ware is communicated with washing tower through pipeline, ammonia water preparation ware fixed communication has ammonia water circulation pipeline, ammonia water circulation pipeline is fixedly installed with ammonia water circulating pump, and one end of ammonia water circulation pipeline is communicated with two branch pipes, and one way branch pipe is communicated with ammonia water preparation ware, and one way branch pipe is fixedly connected with qualified ammonia water delivery pipe, the import of ammonia water cooler is connected with circulating water input pipe, and the export is connected with circulating water output pipe, and ammonia water circulation pipeline on ammonia water preparation ware passes through from the inside of ammonia water cooler, and ammonia water circulation pipeline is contacted with the cooling water of ammonia water cooler inside, and the import of tail gas absorption groove is fixedly communicated with deionized water delivery pipe, and the deionized water delivery pipe is fixedly installed with water supplementing pump, and tail gas absorption groove is communicated with ammonia water preparation ware through pipeline.

[0006] As a preferred technical scheme, the liquid ammonia vaporizer and the precision filter are fixedly communicated with a nitrogen delivery pipe on a connecting pipeline.

[0007] As a preferred technical scheme, the washing tower is provided with a washing circulating water inlet and outlet, and a washing circulating pipe is fixedly communicated between the inlet and the outlet, and a washing circulating pump is fixedly installed on the washing circulating pipe.

[0008] As a preferred technical scheme, the ammonia water circulating pipeline on the ammonia water preparation ware passes through from the inside of the liquid ammonia vaporizer.

[0009] As a preferred technical scheme, a cut-off valve is fixedly installed on the liquid ammonia delivery pipe.

[0010] As a preferred technical scheme, a flow meter and an adjusting valve are fixedly installed on a connecting pipeline between the washing tower and the ammonia water preparation ware.

[0011] As a preferred technical scheme, a density meter is fixedly installed on the ammonia water circulating pipeline connected with the ammonia water preparation ware.

[0012] The utility model at least has following beneficial effect:

[0013] The liquid-gas conversion is realized by the special gasification equipment, impurities are not easy to be mixed into the gas, and the special filtering and mixing are carried out before the preparation equipment, so that the reaction purity and effect of the rare earth smelting are improved, in addition, the liquid ammonia preparation method can realize effective energy recycling, reduces the energy consumption in the ammonia water preparation process, reduces the production cost, has the characteristics of high preparation purity, stable and adjustable concentration, low energy consumption and high safety factor. BRIEF DESCRIPTION OF DRAWINGS

[0014] The drawings described herein are used to provide further understanding of the present application, and form a part of the present application, the illustrative embodiments of the present application and the description thereof are used to explain the present application, and do not constitute improper limitation on the present application.

[0015] Figure 1 A flow chart of the high-purity ammonia water preparation device in the rare earth smelting industry.

[0016] Explanation of reference numerals:

[0017] 1, liquid ammonia vaporizer; 101, liquid ammonia conveying pipe; 102, nitrogen conveying pipe; 2, precision filter; 3, washing tower; 301, washing circulating pump; 4, ammonia water preparation device; 401, qualified ammonia water conveying pipe; 5, ammonia water cooler; 501, circulating water input pipe; 502, circulating water output pipe; 6, ammonia water circulating pump; 7, tail gas absorption tank; 701, deionized water conveying pipe; 702, water supplementing pump. DETAILED DESCRIPTION

[0018] The embodiments of the present application will be described in detail below with reference to the drawings and examples, so that the realization process of how to apply technical means to solve technical problems and achieve technical effects of the present application can be fully understood and implemented.

[0019] Embodiment

[0020] Please refer to Figure 1As shown, the embodiment provides a kind of high-purity ammonia water preparation device of rare earth smelting industry, including: for the extraction of high-purity ammonia water raw material of rare earth smelting industry liquid ammonia vaporizer 1, its import is fixedly connected with liquid ammonia conveying pipe 101;Precise filter 2, its import is communicated with the discharge port of liquid ammonia vaporizer 1 by pipeline;Washing tower 3, its import is communicated with precise filter 2, liquid ammonia vaporizer 1 respectively by pipeline and diffusion valve;Ammonia water preparation device 4, its import is communicated with washing tower 3 by pipeline, ammonia water preparation device 4 is fixedly communicated with ammonia water circulation pipeline, ammonia water circulation pump 6 is fixedly installed on ammonia water circulation pipeline, one end of ammonia water circulation pipeline is communicated with two branch pipes, one branch pipe is communicated with ammonia water preparation device 4, and one branch pipe is fixedly connected with qualified ammonia water conveying pipe 401;Ammonia water cooler 5, its import is connected with circulating water input pipe 501, and its export is connected with circulating water output pipe 502, ammonia water circulation pipeline on ammonia water preparation device 4 passes through the inside of ammonia water cooler 5, and ammonia water circulation pipeline is in contact with cooling water in the inside of ammonia water cooler 5;And tail gas absorption tank 7, its import is fixedly communicated with deionized water conveying pipe 701, and water pump 702 is fixedly installed on deionized water conveying pipe 701, tail gas absorption tank 7 is communicated with ammonia water preparation device 4 by pipeline, liquid-vapor conversion is realized by special gasification equipment, so that impurities are not easy to be doped into gas, and after special filtering and mixing, preparation equipment is entered, the reaction purity and effect of rare earth smelting are improved, in addition, the preparation method of the liquid ammonia can effectively recover and utilize energy, so that the energy consumption in the process of preparing ammonia water is reduced, the production cost is reduced, and the prepared ammonia water has the characteristics of high purity, stable and adjustable concentration, low energy consumption and high safety factor.

[0021] Wherein, nitrogen conveying pipe 102 is fixedly communicated on the connecting pipeline of liquid ammonia vaporizer 1 and precise filter 2, nitrogen conveying pipe 102 is communicated on the connecting pipeline of liquid ammonia vaporizer 1 and precise filter 2, nitrogen is used to replace air and dilute liquid ammonia concentration, effectively reduces the explosion risk in the process of liquid ammonia conveying and the whole device operation, guarantees the personal safety of operator and the safety of device equipment, and creates a safer and more reliable production environment.

[0022] Wherein, washing tower 3 is provided with washing circulating water inlet and outlet, and washing circulating pipe is fixedly communicated between the inlet and the outlet, and washing circulating pump 301 is fixedly installed on the washing circulating pipe, so that the circulating water can be repeatedly used, on the one hand, the waste of water resources is avoided, and the utilization efficiency of water is improved, on the other hand, since the circulating water is always circulated in the relatively closed system, its own properties and state are relatively stable, which is more conducive to continuously and stably washing and purifying ammonia gas, guarantees the stability and reliability of the whole washing process, and lays a foundation for the stable subsequent ammonia water preparation process.

[0023] The ammonia circulation pipeline on the ammonia water preparation device 4 passes through the inside of the liquid ammonia vaporizer 1, vaporizes the liquid ammonia discharged from the ammonia water preparation device, recovers system heat, and reduces external heat source consumption.

[0024] The cut-off valve is fixedly installed on the liquid ammonia conveying pipe 101, and the liquid ammonia supply can be quickly cut off in an emergency to prevent the danger from further expanding, thereby providing an important emergency safeguard mechanism for safe operation of the entire device and enhancing the safety and reliability of the device.

[0025] The flow meter and the adjusting valve are fixedly installed on the connecting pipeline between the washing tower 3 and the ammonia water preparation device 4, the water flow entering the ammonia water preparation device 4 can be accurately measured and controlled in real time through the flow meter and the adjusting valve installed on the connecting pipeline between the washing tower 3 and the ammonia water preparation device 4, so that the water can react with the water according to the preset accurate proportion, and the feedback control of the density meter on the ammonia water concentration is realized, thereby realizing accurate control of the ammonia water preparation process and ensuring the quality stability and consistency of each batch of ammonia water output, which is more conducive to stable production according to the standardized process in the rare earth smelting industry.

[0026] The density meter is fixedly installed on the ammonia water circulation pipeline connected to the ammonia water preparation device 4, the ammonia water density can be monitored in real time through the density meter, the control system accurately controls the ammonia water concentration, and the ammonia water concentration is stably controlled at a high-precision level meeting the requirements, such as a target high-purity concentration, thereby further improving the product quality and making it more suitable for various chemical reactions and process links in rare earth smelting.

[0027] The liquid levels of the liquid ammonia vaporizer 1, the tail gas absorption tank 7, and the ammonia water preparation device 4 are monitored in real time, and once the liquid level reaches the upper limit or the lower limit, the system immediately sends an alarm signal to remind the operator, and when the liquid level reaches the upper limit or the lower limit, the corresponding interlocking device is started, such as the liquid ammonia vaporizer 1 liquid level high limit, the liquid ammonia feeding is cut off to prevent accidents.

[0028] The gasification ammonia gas pressure and the ammonia water preparation device 4 pressure are also monitored in real time, and when the high limit alarm occurs, if the pressure continues to rise to the high limit, the liquid ammonia feeding is cut off to avoid pipeline rupture, explosion, and other dangers caused by excessive pressure.

[0029] The temperature of the ammonia water preparation device 4 body is monitored in real time, and if the temperature reaches the high limit alarm, the operator needs to promptly investigate the cause and adjust the process parameters to prevent the ammonia water preparation quality and equipment safety from being affected by excessive temperature.

[0030] Working principle:

[0031] Liquid ammonia is transported from the external storage device to the inlet of the liquid ammonia vaporizer 1 through the liquid ammonia delivery pipe 101. During this process, the shut-off valve on the liquid ammonia delivery pipe 101 is open to ensure the normal flow of liquid ammonia. At the same time, nitrogen gas can be introduced into the pipe as needed through the nitrogen gas delivery pipe 102. The nitrogen gas is used to replace the air in the pipe to prevent the formation of flammable mixtures that can cause explosions. It also dilutes the concentration of liquid ammonia to within a safe range, reducing safety hazards. It also creates a relatively dry and inert environment to protect the pipe from corrosion. When the liquid ammonia enters the liquid ammonia vaporizer 1, heat is exchanged with the heat exchange medium inside the vaporizer to vaporize the liquid ammonia into ammonia gas. The vaporized ammonia gas is discharged from the top outlet of the liquid ammonia vaporizer 1. After the ammonia gas exits the liquid ammonia vaporizer 1, it enters the precision filter 2 through the pipe. The precision filter 2 uses internal filter media to intercept and filter solid particulate impurities such as rust and dust from the ammonia gas, ensuring that the ammonia gas entering the next stage is initially pure. The preliminarily filtered ammonia gas then enters the preparation device through the pipe. At the same time, water is also introduced into the ammonia water preparation device 4 in a certain proportion. The water flow is monitored in real time by the flow meter on the connecting pipe between the scrubbing tower 3 and the ammonia water preparation device 4, and the data is fed back to the control system. The regulating valve automatically adjusts the valve opening degree according to the instructions of the control system to accurately control the flow of ammonia gas entering the ammonia water preparation device 4, ensuring that the gas-water mixing ratio meets the set requirements to prepare ammonia water of the target concentration. In the ammonia water preparation device 4, ammonia gas reacts with water to produce ammonia water. The ammonia water circulation pipeline fixedly connected to the ammonia water preparation device 4 and the ammonia water circulation pump 6 installed thereon start to work. The ammonia water enters the ammonia water cooler 5 from the ammonia water preparation device 4 through the ammonia water circulation pipeline. The circulating water enters the ammonia water cooler 5 from the circulating water input pipe 501. In the cooler, it exchanges heat with the ammonia water in the ammonia water circulation pipeline, taking away the heat of the ammonia water. The cooled ammonia water flows out from the circulating water output pipe 502 of the ammonia water cooler 5 and continues to circulate in the ammonia water circulation pipeline, maintaining a suitable temperature environment to ensure the stability of the ammonia water during the entire preparation process. The ammonia water flows in the circulation system composed of the circulation pipeline, the ammonia water preparation device 4, and the branch pipe connected to one end of the circulation pipeline. One branch pipe returns part of the ammonia water to the ammonia water preparation device 4 itself, making the ammonia water mix more uniformly in the preparation device and promoting the full reaction of ammonia gas and water. The other branch pipe is connected to the qualified ammonia water delivery pipe 401 for outputting the final qualified ammonia water product. During system operation, tail gas such as unreacted ammonia gas produced in each link is collected and transported to the tail gas absorption tank 7. The water pump 702 at the inlet of the tail gas absorption tank 7 starts to transport deionized water from the deionized water delivery pipe 701 to the tail gas absorption tank 7. The ammonia gas in the tail gas contacts and is absorbed by the deionized water, generating ammonia water. Since the tail gas absorption tank 7 is connected to the ammonia water preparation device 4 through the pipe, the ammonia water generated after absorbing the tail gas can re-enter the ammonia water preparation process, realizing the recycling of ammonia resources, reducing resource waste, and reducing the emission of ammonia gas in the tail gas and environmental pollution.

[0032] The above description shows and describes several preferred embodiments of the present application, but as previously indicated, the present application is not limited to the forms disclosed, but should be accorded the full scope consistent with the patent and principles of patent law, and can be practiced in various other combinations, modifications, and environments, and with the contents of the application concept described herein, through the teachings or relevant knowledge in the art or technology, and can be changed. Any changes and modifications made by those skilled in the art without departing from the spirit and scope of the present application shall be within the scope of protection of the claims of the present application.

Claims

1. A high-purity ammonia water preparation device for the rare earth smelting industry, characterized in that, include: A liquid ammonia vaporizer (1) for extracting high-purity ammonia water raw materials in the rare earth smelting industry has a liquid ammonia delivery pipe (101) fixedly connected to its inlet. The precision filter (2) has its inlet connected to the outlet of the liquid ammonia vaporizer (1) via a pipe; The scrubbing tower (3) has its inlet connected to the precision filter (2) and the vent valve of the liquid ammonia vaporizer (1) via a pipeline; The ammonia water preparation device (4) has its inlet connected to the washing tower (3) through a pipeline. The ammonia water preparation device (4) is fixedly connected to an ammonia water circulation pipeline. An ammonia water circulation pump (6) is fixedly installed on the ammonia water circulation pipeline. One end of the ammonia water circulation pipeline is connected to two branch pipes. One branch pipe is connected to the ammonia water preparation device (4), and the other branch pipe is fixedly connected to a qualified ammonia water delivery pipe (401). An ammonia water cooler (5) has a circulating water input pipe (501) connected to its inlet and a circulating water output pipe (502) connected to its outlet. An ammonia water circulation pipe on the ammonia water generator (4) passes through the interior of the ammonia water cooler (5) and is in contact with the cooling water inside the ammonia water cooler (5). The exhaust gas absorption tank (7) has a deionized water delivery pipe (701) fixedly connected to its inlet. A water replenishment pump (702) is fixedly installed on the deionized water delivery pipe (701). The exhaust gas absorption tank (7) is connected to the ammonia water preparer (4) through a pipeline.

2. The high-purity ammonia water preparation device for the rare earth smelting industry according to claim 1, characterized in that: A nitrogen delivery pipe (102) is fixedly connected to the connecting pipe of the liquid ammonia vaporizer (1) and the precision filter (2).

3. The high-purity ammonia water preparation device for the rare earth smelting industry according to claim 2, characterized in that: The washing tower (3) is provided with a washing circulating water inlet and outlet, and a washing circulating pipe is fixedly connected between the inlet and outlet. A washing circulating pump (301) is fixedly installed on the washing circulating pipe.

4. A high-purity ammonia water preparation device for the rare earth smelting industry according to claim 3, characterized in that: The ammonia water circulation pipe on the ammonia water generator (4) passes through the interior of the liquid ammonia vaporizer (1).

5. A high-purity ammonia water preparation device for the rare earth smelting industry according to claim 1, characterized in that: A shut-off valve is fixedly installed on the liquid ammonia delivery pipe (101).

6. The high-purity ammonia water preparation device for the rare earth smelting industry according to claim 1, characterized in that: A flow meter and a regulating valve are fixedly installed on the connecting pipeline between the washing tower (3) and the ammonia water preparer (4).

7. A high-purity ammonia water preparation device for the rare earth smelting industry according to claim 1, characterized in that: A density meter is fixedly installed on the ammonia water circulation pipe connected to the ammonia water preparer (4).

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