A molten phosphorus production system and production method

Abstract

The present invention relates to the field of fine chemical technology, and in particular to a molten phosphorus production system and production method. It includes a molten phosphorus pool, a phosphorus sedimentation pool, a phosphorus storage pool, a circulating water pool and a control device; the molten phosphorus pool, the phosphorus sedimentation pool, the phosphorus storage pool and the circulating water pool are all connected to the control device, and the liquid level height and liquid temperature in the pool are controlled by the control device; the molten phosphorus pool, the phosphorus sedimentation pool and the phosphorus storage pool are all provided with water seals; the molten phosphorus pool is connected to the phosphorus sedimentation pool; the upper water seal part of the phosphorus sedimentation pool is connected to the upper water seal part of the phosphorus storage pool, and the phosphorus liquid in the phosphorus sedimentation pool is transported to the phosphorus storage pool through a reverse phosphorus pump; the upper water seal part of the phosphorus storage pool is also connected to the upper part of the circulating water pool, and the circulating water in the circulating water pool is respectively transported to the molten phosphorus pool and the phosphorus sedimentation pool through a circulating water pump; the circulating water pool is also connected to an external water pipe, and the upper part of the circulating water pool is connected to a drainage network. The present invention has the advantages of safety and environmental protection.

Description

Technical Field

[0001] The invention relates to the technical field of fine chemical industry, and in particular to a molten phosphorus production system and a production method. Background Art

[0002] The most widely used method at present is to place solid yellow phosphorus in a hot water pool, melt it according to the melting point of yellow phosphorus at 44.1℃, store the solid yellow phosphorus in liquid form through a water seal, and then transport it through a submersible pump when needed. This widely used method has the following problems: 1. Yellow phosphorus itself contains certain impurities. If it is directly used after simple melting, it will bring certain quality risks to subsequent use. 2. Due to the physical and chemical properties of yellow phosphorus itself, yellow phosphorus will spontaneously ignite when it comes into contact with air, emitting a large amount of white smoke and polluting the air, so water seals will be used for storage operations, but this will inevitably lead to a large amount of water being directly discharged, wasting water resources. 3. Manual operation may bring certain dangers. Summary of the invention

[0003] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a molten phosphorus production system and production method.

[0004] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0005] On the one hand, the present invention provides a molten phosphorus production system, comprising a molten phosphorus pool, a phosphorus sedimentation pool, a phosphorus storage pool, a circulating water pool and a control device; the molten phosphorus pool, the phosphorus sedimentation pool, the phosphorus storage pool and the circulating water pool are all connected to the control device, and the liquid level height and liquid temperature in the molten phosphorus pool, the phosphorus sedimentation pool, the phosphorus storage pool and the circulating water pool are controlled by the control device; the molten phosphorus pool, the phosphorus sedimentation pool and the phosphorus storage pool are all provided with water seals; the molten phosphorus pool is connected to the phosphorus sedimentation pool to transport the phosphorus liquid in the molten phosphorus pool to the phosphorus sedimentation pool; the upper water seal portion of the phosphorus sedimentation pool is connected to the upper water seal portion of the phosphorus storage pool The phosphorus settling tank and the phosphorus storage tank are connected, and the phosphorus liquid in the phosphorus settling tank is transported to the phosphorus storage tank through a phosphorus reverse pump; the upper water seal part of the phosphorus storage tank is also connected with the upper part of the circulating water tank, and the circulating water in the circulating water tank is transported to the molten phosphorus pool and the phosphorus settling tank respectively through a circulating water pump; the circulating water pool is also connected with an external water pipe to replenish fresh water into the system; the upper part of the circulating water pool is connected with a drainage network; the molten phosphorus pool, the phosphorus settling tank, the phosphorus storage tank and the circulating water pool are all provided with a heating bypass pipe, and the heating bypass pipe is connected with a low-pressure steam pipeline to make the yellow phosphorus in the molten phosphorus pool, the phosphorus settling tank and the phosphorus storage tank in liquid state.

[0006] Furthermore, a float valve is arranged in the phosphorus settling tank, and the float valve is connected to the external water pipe to adjust the height of the water seal liquid level in the phosphorus settling tank, ensuring that the water seal liquid level in the phosphorus settling tank and the phosphorus storage tank is the same as the liquid level height in the circulating water tank.

[0007] Furthermore, thermometers are provided in the phosphorus sedimentation tank and the phosphorus storage tank, and the thermometers are connected to the control device. The control device controls the opening of the regulating valve on the low-pressure steam pipeline according to the numerical value collected by the thermometer to control the liquid temperature in the phosphorus sedimentation tank and the phosphorus storage tank.

[0008] Furthermore, the height of the phosphorus liquid in the phosphorus sedimentation tank is 500-1000 mm, and the upper water seal height is not less than 200 mm.

[0009] Furthermore, the height of the phosphorus liquid in the phosphorus storage tank is 500-1000 mm, and the height of the upper water seal is not less than 200 mm.

[0010] Furthermore, it also includes a barrel washing pool for washing the outer wall of the yellow phosphorus barrel. A crane is arranged above the barrel washing pool, and the yellow phosphorus barrel and the solid yellow phosphorus in the yellow phosphorus barrel are placed into the molten phosphorus pool by the crane.

[0011] In another aspect, the present invention provides a method for producing molten phosphorus, comprising the following steps:

[0012] S1. Put the yellow phosphorus barrel and the solid yellow phosphorus in the yellow phosphorus barrel into a molten phosphorus pool, heat the water in the molten phosphorus pool to 60-80° C. by heating the low-pressure steam in the side pipe, so that the solid yellow phosphorus melts and becomes liquid yellow phosphorus;

[0013] S2, placing the melted liquid yellow phosphorus in S1 into a phosphorus settling tank through potential difference, and hot water is placed in the phosphorus settling tank in advance;

[0014] S3. After the liquid yellow phosphorus in the phosphorus settling tank has settled for 48 hours or more, the phosphorus pump on the phosphorus settling tank is promptly turned on according to the yellow phosphorus liquid level in the phosphorus storage tank to deliver the settled yellow phosphorus to the phosphorus storage tank, into which hot water is pre-placed;

[0015] S4. The liquid yellow phosphorus in the phosphorus storage tank is transported to the next process through a transfer pump.

[0016] Furthermore, in S2, the yellow phosphorus liquid level in the phosphorus sedimentation tank is controlled by a control device to be 500-1000 mm, the upper water seal height is not less than 200 mm, and the temperature is 60-80°C.

[0017] Furthermore, in S3, the yellow phosphorus liquid level in the phosphorus storage tank is controlled by a control device to be 500-1000 mm, the upper water seal height is not less than 200 mm, and the temperature is 60-80°C.

[0018] Furthermore, the water in the molten phosphorus pool and the phosphorus settling pool is provided by a circulating water pool, the upper water seal portion of the phosphorus settling pool is connected to the upper water seal portion of the phosphorus storage pool, and the upper water seal portion of the phosphorus storage pool is connected to the circulating water pool to ensure that the phosphorus storage pool and the phosphorus settling pool are always full of water.

[0019] The beneficial effects of the present invention are:

[0020] 1. Safety: All operations are carried out under water seal protection, avoiding the possibility of yellow phosphorus contacting the outside world.

[0021] 2. Environmental protection: All water used is recycled, reducing the waste of water resources.

[0022] 3. Ensure quality: The melted liquid yellow phosphorus enters the sedimentation tank by its own gravity for sedimentation, and the impurities in the yellow phosphorus are deposited, which is beneficial to improve the quality of the yellow phosphorus.

[0023] 4. Convenience: All operations can be completed by only 1 to 2 operators. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The present invention is a process flow chart of a phosphorus melting production system.

[0025] In the figure: 1. molten phosphorus pool; 2. phosphorus sedimentation pool; 3. phosphorus storage pool; 4. circulating water pool; 5. phosphorus dump pump; 6. circulating water pump; 7. delivery pump; 8. low-pressure steam pipeline; 9. liquid pipeline; 10. float valve; 11. regulating valve; 12. external water pipe; 13. pipeline; 14. overflow port; 15. barrel washing pool. DETAILED DESCRIPTION

[0026] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0027] Example:

[0028] The present invention is further described below in conjunction with the accompanying drawings:

[0029] like Figure 1 As shown, the present invention provides a molten phosphorus production system. The system includes a molten phosphorus pool 1, a phosphorus settling pool 2, a phosphorus storage pool 3, a circulating water pool 4 and a control device. The molten phosphorus pool 1, the phosphorus settling pool 2, the phosphorus storage pool 3 and the circulating water pool 4 are all connected to the control device, and the liquid level height and liquid temperature in the molten phosphorus pool 1, the phosphorus settling pool 2, the phosphorus storage pool 3 and the circulating water pool 4 are controlled by the control device.

[0030] The molten phosphorus pool 1 of the present invention is arranged above one side of the phosphorus sedimentation tank 2, and the lower part of the molten phosphorus pool 1 is connected to the upper part of the phosphorus sedimentation tank 2 through a liquid pipeline 9, and a regulating valve 11 is arranged on the liquid pipeline 9, and the phosphorus liquid in the molten phosphorus pool 1 is transported to the phosphorus sedimentation tank 2 through the height difference between the molten phosphorus pool 1 and the phosphorus sedimentation tank 2. A sedimentation tank is arranged at the lower part of the phosphorus sedimentation tank 2, which is used to precipitate impurities (such as phosphorus mud) in the phosphorus liquid. The upper water seal parts of the phosphorus sedimentation tank 2, the phosphorus storage tank 3 and the circulating water tank 4 are connected by a pipeline 13 to ensure that the water seal liquid level is consistent. The phosphorus liquid after precipitation in the phosphorus sedimentation tank 2 is transported to the phosphorus storage tank 3 through a phosphorus pump 5. Specifically, the present invention selects a phosphorus pump 5 of a suitable length so that the phosphorus pump 5 can only transport phosphorus liquid when working, and will not transport the impurities below to the phosphorus storage tank 3 together. The phosphorus liquid in the phosphorus storage tank 3 is transported to the next process through a delivery pump 7. The circulating water in the circulating water pool 4 is transported to the molten phosphorus pool 1 and the phosphorus settling pool 2 respectively through the circulating water pump 6 to replenish the water in the molten phosphorus pool 1 and the phosphorus settling pool 2 from time to time. The molten phosphorus pool 1, the phosphorus settling pool 2 and the circulating water pool 4 are also connected to the external water pipe to replenish the external fresh water into the system. The upper part of the circulating water pool 4 is connected to the drainage network through the overflow port 14 to discharge the excess water in the system to prevent the water seal from bursting. Specifically, a section of water pipe protruding upward is arranged on the upper part of the circulating water pool 4 to play the role of a water seal. When the water level in the circulating water pool 4 is higher than the height of the protruding water pipe section, the water in the circulating water pool 4 will flow into the external drainage network. The overflow water in the phosphorus settling pool 2 and the phosphorus storage tank 3 of the present invention is recycled to the circulating water pool 4 for recycling to ensure that no sewage is discharged.

[0031] Among them, thermometers are set in the molten phosphorus pool 1, the phosphorus settling pool 2, the phosphorus storage pool 3 and the circulating water pool 4. The thermometers in the phosphorus settling pool 2 and the phosphorus storage pool 3 are connected to the control device. The control device controls the opening of the regulating valve on the low-pressure steam pipeline 8 according to the data collected by the thermometer, so as to control the liquid temperature in the phosphorus settling pool 2 and the phosphorus storage pool 3. Because the circulating water pool 4 is connected to the phosphorus settling pool 2 and the phosphorus storage pool 3, the water temperature in these three pools should be the same. As for the molten phosphorus pool 1, the temperature in the pool is controlled by manually operating the valve. After all, the molten phosphorus pool 1 needs to melt solid yellow phosphorus into liquid yellow phosphorus. In order to accelerate the melting speed, the temperature in the pool must be slightly higher than the temperature of other pools. Because the present invention is intermittent phosphorus melting, the amount of phosphorus melting on the day is determined according to the liquid level of yellow phosphorus in the molten phosphorus pool 1. When phosphorus is not melted, the water in the molten phosphorus pool 1 does not need to be heated to avoid wasting steam. Only when phosphorus is melted, the water in the molten phosphorus pool 1 is heated to 60-80°C in advance, and then phosphorus melting is started. Liquid level gauges are provided in the molten phosphorus pool 1, the phosphorus settling pool 2, the phosphorus storage pool 3 and the circulating water pool 4. The liquid level gauges in the phosphorus settling pool 2 and the phosphorus storage pool 3 are connected to the control device. The control device controls the switch of the phosphorus pump 5 and the delivery pump 7 according to the data collected by the liquid level gauge, so as to control the liquid level height of the phosphorus liquid in the phosphorus settling pool 2 and the phosphorus storage pool 3 to meet the process requirements. Specifically, the height of the phosphorus liquid in the phosphorus settling pool 2 is 500-1000mm, and the upper water seal height is not less than 200mm. The height of the phosphorus liquid in the phosphorus storage pool 3 is 500-1000mm, and the upper water seal height is not less than 200mm.

[0032] Specifically, the control device is a control computer equipped with a safety instrument remote control system, which is connected to the regulating valve, liquid level meter and thermometer on site respectively. The temperature displayed by the on-site thermometer is transmitted to the control computer through a remote signal, and the personnel adjust the size of the regulating valve on the low-pressure steam pipeline to achieve the increase and decrease of the liquid temperature in each tank. The liquid level displayed by the on-site liquid level meter is transmitted to the control computer through a remote signal, and by triggering the interlock, when the phosphorus liquid level in the phosphorus storage tank 3 is high, the control device controls the phosphorus pump 5 to stop automatically. The operating principle of the control device is to transmit the on-site electrical signal source to the control computer, and the control personnel transmit the operation signal back to the on-site regulating valve through the control computer to realize the process of converting the electrical signal source into a gas signal source.

[0033] Due to the physical and chemical properties of yellow phosphorus itself, yellow phosphorus will spontaneously ignite when in contact with air, and yellow phosphorus does not react with water, and the density of yellow phosphorus is greater than the density of water, so a water seal is used for storage operation. The present invention provides a water seal of a certain height in the molten phosphorus pool 1, the phosphorus settling pool 2 and the phosphorus storage pool 3. Among them, the water seal height in the molten phosphorus pool 1 can be controlled by the circulating water pool 4 or the external water pipe 12. The water seal height in the phosphorus settling pool 2 and the phosphorus storage pool 3 is adjusted by a float valve 10. The float valve 10 is arranged in the phosphorus settling pool 2, and is connected to the external water pipe 12. When the water seal liquid level in the phosphorus settling pool 2 is reduced to a set value, the float valve 10 is opened, and fresh water is injected into the phosphorus settling pool 2 to meet the process requirements. When the water seal liquid level in the phosphorus settling pool 2 is raised to a set value, the float valve 10 is closed, indicating that the water seal height in the phosphorus settling pool 2 meets the process requirements.

[0034] In the present invention, a heating bypass pipe is arranged in the molten phosphorus pool 1, the phosphorus settling pool 2, the phosphorus storage pool 3 and the circulating water pool 4, and the heating bypass pipe is connected with the low-pressure steam pipeline 8, so that the yellow phosphorus in the molten phosphorus pool 1, the phosphorus settling pool 2 and the phosphorus storage pool 3 is in a liquid state. By controlling the opening of the regulating valve 11 on the low-pressure steam pipeline 8, the low-pressure steam in the heating bypass pipe enters the molten phosphorus pool 1, the phosphorus settling pool 2, the phosphorus storage pool 3 and the circulating water pool 4, and then the liquid temperature in the molten phosphorus pool 1, the phosphorus settling pool 2, the phosphorus storage pool 3 and the circulating water pool 4 is controlled to reach 60-80°C.

[0035] In another embodiment of the present invention, the system further comprises a barrel washing pool 15 for washing the outer wall of the yellow phosphorus barrel, and a crane is arranged above the barrel washing pool 15. In specific operation, the upper cover of the washed yellow phosphorus barrel is opened, and the yellow phosphorus barrel and the solid yellow phosphorus in the yellow phosphorus barrel are placed into the molten phosphorus pool 1 by the crane. The crane in the present invention is a prior art and can realize up and down, left and right, front and back movement.

[0036] On the other hand, the present invention also provides a method for producing molten phosphorus. The method comprises the following steps:

[0037] S1. Put the yellow phosphorus barrel and the solid yellow phosphorus in the yellow phosphorus barrel into the molten phosphorus pool 1, and heat the water in the molten phosphorus pool 1 to 60-80° C. through the low-pressure steam in the low-pressure steam pipeline 8, so that the solid yellow phosphorus melts and flows into the water; this step is a melting process for converting the yellow phosphorus from solid to liquid.

[0038] S2, placing the melted yellow phosphorus in S1 into a phosphorus sedimentation tank 2 through potential difference, wherein hot water of a certain height is pre-placed in the phosphorus sedimentation tank 2; specifically, the yellow phosphorus liquid level in the phosphorus sedimentation tank 2 is controlled by a control device to be 500-1000 mm, the upper water seal height is not less than 200 mm, and the temperature is 60-80° C.; in this step, impurities in the yellow phosphorus itself are deposited by sedimentation.

[0039] S3, after the sedimentation time of yellow phosphorus in phosphorus sedimentation tank 2 reaches or exceeds 48 hours, the phosphorus pump 5 on phosphorus sedimentation tank 2 is timely opened according to the yellow phosphorus liquid level in phosphorus storage tank 3, and the settled yellow phosphorus is sent to phosphorus storage tank 3, and a certain height of hot water is pre-placed in phosphorus storage tank 3; specifically, the yellow phosphorus liquid level in phosphorus storage tank 3 is controlled by the control device to be 500-1000mm, the upper water seal height is not less than 200mm, and the temperature is 60-80°C; this step safely stores the settled yellow phosphorus for easy use.

[0040] S4, the yellow phosphorus in the phosphorus storage tank 3 is transported to the next process through the delivery pump 7.

[0041] Among them, the water in the molten phosphorus pool 1 and the phosphorus sedimentation pool 2 is provided by the circulating water pool 4, the upper water seal part of the phosphorus sedimentation pool 2 is connected with the upper water seal part of the phosphorus storage pool 3, the upper water seal part of the phosphorus storage pool 3 is connected with the circulating water pool 4, and the molten phosphorus pool 1, the phosphorus sedimentation pool 2 and the circulating water pool 4 are also connected with the external water pipe 12 respectively to ensure that the phosphorus storage pool 3 and the phosphorus sedimentation pool 2 are always full of water, and all water sources can be recycled and reused.

[0042] When the present invention is implemented, firstly, the dirt and other dust on the outside of the yellow phosphorus barrel is washed clean in the barrel washing pool 15 by means of a hose through a barrel washing pump. The upper cover of the solid yellow phosphorus barrel is cut open with a barrel cutter, and the yellow phosphorus barrel and the solid yellow phosphorus in the barrel are placed together in a molten phosphorus pool 1 filled with water by means of a crane. The number of yellow phosphorus barrels placed in the molten phosphorus pool 1 at one time is based on the requirement that all the yellow phosphorus barrels are immersed in water, and at the same time, it is ensured that after these yellow phosphorus are placed in the phosphorus settling pool 2, the yellow phosphorus liquid level in the phosphorus settling pool 2 does not exceed the standard. The water in the molten phosphorus pool 1 is heated to 60-80° C. by low-pressure steam, so that the yellow phosphorus melts and flows into the water. After the yellow phosphorus melts, the yellow phosphorus barrel is taken out of the molten phosphorus pool 1 by a crane.

[0043] After the yellow phosphorus is melted, it is placed in the phosphorus settling tank 2 through the height difference. The phosphorus settling tank 2 should be pre-filled with water to a position at the same horizontal line as the overflow port 14 of the circulating water tank 4. The water temperature in the phosphorus settling tank 2 is controlled at 60-80°C by the DCS control device. The yellow phosphorus liquid level in the phosphorus settling tank 2 is controlled at 500-1000mm, and the upper water seal height is not less than 200mm. When the yellow phosphorus settling time in the phosphorus settling tank 2 reaches or exceeds 48 hours, the phosphorus pump 5 in the phosphorus settling tank 2 is opened in time according to the phosphorus level in the phosphorus storage tank 3 to transport the settled yellow phosphorus to the phosphorus storage tank 3. The phosphorus storage tank 3 should be pre-filled with water to a position at the same horizontal line as the overflow port 14 of the circulating water tank 4. The water temperature is controlled at 60-80°C by the DCS control device. The yellow phosphorus liquid level in the phosphorus storage tank 3 is controlled at 500-1000mm, and the upper water seal height is controlled at not less than 200mm. The upper water seal parts of the phosphorus settling tank 2 and the phosphorus storage tank 3 are connected, and the liquid level on the water seal in the phosphorus settling tank 2 is automatically controlled by the float valve 10 connected to the external water pipe 12 to ensure that the phosphorus settling tank 2 and the phosphorus storage tank 3 are always full of water. At the same time, the DCS control device can also display the water seal heights in the phosphorus settling tank 2 and the phosphorus storage tank 3 respectively. In addition, the delivery pump 7 in the phosphorus storage tank 3 and the phosphorus pump 5 in the phosphorus settling tank 2 are interlocked with the yellow phosphorus liquid level in the phosphorus storage tank 3. When the yellow phosphorus liquid level in the phosphorus storage tank 3 is higher than the high limit alarm, the delivery pump 7 and the phosphorus pump 5 automatically stop and are restarted after the on-site staff checks to ensure safety.

Claims

1. A phosphorus melting production system, characterized in that: The invention comprises a molten phosphorus pool, a phosphorus settling pool, a phosphorus storage pool, a circulating water pool and a control device; the molten phosphorus pool, the phosphorus settling pool, the phosphorus storage pool and the circulating water pool are all connected to the control device, and the liquid level height and liquid temperature in the molten phosphorus pool, the phosphorus settling pool, the phosphorus storage pool and the circulating water pool are controlled by the control device; the molten phosphorus pool, the phosphorus settling pool and the phosphorus storage pool are all provided with water seals; the molten phosphorus pool is connected to the phosphorus settling pool to transport the phosphorus liquid in the molten phosphorus pool to the phosphorus settling pool; the upper water seal part of the phosphorus settling pool is connected to the upper water seal part of the phosphorus storage pool, and the phosphorus settling pool The phosphorus liquid in the system is transported to the phosphorus storage tank by a phosphorus pump; the upper water seal portion of the phosphorus storage tank is also connected to the upper portion of the circulating water tank, and the circulating water in the circulating water tank is respectively transported to the molten phosphorus tank and the phosphorus sedimentation tank by a circulating water pump; the circulating water tank is also connected to an external water pipe to replenish fresh water into the system; the upper portion of the circulating water tank is connected to a drainage network; the molten phosphorus tank, the phosphorus sedimentation tank, the phosphorus storage tank and the circulating water tank are all provided with a heating bypass pipe, and the heating bypass pipe is connected to a low-pressure steam pipeline to ensure that the yellow phosphorus in the molten phosphorus tank, the phosphorus sedimentation tank and the phosphorus storage tank is in liquid state. A float valve is arranged in the phosphorus settling tank, and the float valve is connected to the external water pipe to adjust the height of the water seal liquid level in the phosphorus settling tank, so as to ensure that the water seal liquid level in the phosphorus settling tank and the phosphorus storage tank is the same as the liquid level in the circulating water tank.

2. A phosphorus melting production system according to claim 1, characterized in that: The phosphorus precipitation tank and the phosphorus storage tank are both provided with thermometers, and the thermometers are connected to the control device. The control device controls the opening of the regulating valve on the low-pressure steam pipeline according to the numerical value collected by the thermometer to control the liquid temperature in the phosphorus precipitation tank and the phosphorus storage tank.

3. A phosphorus melting production system according to claim 1, characterized in that: The height of the phosphorus liquid in the phosphorus sedimentation tank is 500-1000mm, and the height of the upper water seal is not less than 200mm.

4. A phosphorus melting production system according to claim 1, characterized in that: The height of the phosphorus liquid in the phosphorus storage tank is 500-1000 mm, and the height of the upper water seal is not less than 200 mm.

5. A phosphorus melting production system according to claim 1, characterized in that: It also includes a barrel washing pool for washing the outer wall of the yellow phosphorus barrel. A crane is arranged above the barrel washing pool, and the yellow phosphorus barrel and the solid yellow phosphorus in the yellow phosphorus barrel are placed into the molten phosphorus pool by the crane.

6. A method for producing molten phosphorus, the method using the molten phosphorus production system according to claim 1, characterized in that: The following steps are involved: S1. Put the yellow phosphorus barrel and the solid yellow phosphorus in the yellow phosphorus barrel into a molten phosphorus pool, heat the water in the molten phosphorus pool to 60-80° C. by heating the low-pressure steam in the side pipe, so that the solid yellow phosphorus melts and becomes liquid yellow phosphorus; S2, placing the melted liquid yellow phosphorus in S1 into a phosphorus settling tank through potential difference, and hot water is placed in the phosphorus settling tank in advance; S3. After the liquid yellow phosphorus in the phosphorus settling tank has settled for 48 hours or more, the phosphorus pump on the phosphorus settling tank is promptly turned on according to the yellow phosphorus liquid level in the phosphorus storage tank to deliver the settled yellow phosphorus to the phosphorus storage tank, into which hot water is pre-placed; S4. The liquid yellow phosphorus in the phosphorus storage tank is transported to the next process through a transfer pump.

7. A method for producing molten phosphorus according to claim 6, characterized in that: In S2, the yellow phosphorus liquid level in the phosphorus sedimentation tank is controlled by a control device to be 500-1000 mm, the upper water seal height is not less than 200 mm, and the temperature is 60-80°C.

8. A method for producing molten phosphorus according to claim 6, characterized in that: In S3, the yellow phosphorus liquid level in the phosphorus storage tank is controlled by a control device to be 500-1000 mm, the upper water seal height is not less than 200 mm, and the temperature is 60-80°C.

9. A method for producing molten phosphorus according to claim 6, characterized in that: The water in the molten phosphorus pool and the phosphorus precipitation pool is provided by a circulating water pool, the upper water seal portion of the phosphorus precipitation pool is connected to the upper water seal portion of the phosphorus storage pool, and the upper water seal portion of the phosphorus storage pool is connected to the circulating water pool to ensure that the phosphorus storage pool and the phosphorus precipitation pool are always full of water.

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