Yellow phosphorus production sewage circulation purification system

Abstract

The invention relates to the technical field of environment-friendly treatment of industrial sewage, in particular to a yellow phosphorus production sewage circulation purification system which is provided with a yellow phosphorus sewage tank, a multi-stage sedimentation mechanism, a concentration and filtration mechanism and a clear liquid collection tank which are sequentially arranged along a sewage treatment flow. The yellow phosphorus sewage tank is used for collecting yellow phosphorus production sewage; the multi-stage sedimentation mechanism is provided with a plurality of deep cone sedimentation machines which are arranged in series and are used for carrying out sedimentation separation on the conveyed yellow phosphorus sewage; the concentrating and filtering mechanism is used for concentrating and separating the conveyed settling floating liquid; and the clear liquid collecting tank is used for collecting the clear liquid separated by the concentrating and filtering mechanism and conveying the clear liquid to the phosphorus collecting tower through a water conveying pipe. Aiming at the special characteristics of yellow phosphorus production sewage purification treatment, the invention constructs a closed-cycle purification system, has the technical characteristics of great reduction of land occupation, low construction and operation cost and excellent separation and purification effects, and has remarkable technical effects and economic benefits.

Description

Technical Field

[0001] The invention relates to the technical field of environmentally friendly treatment of industrial sewage, in particular to a yellow phosphorus production sewage circulation purification system. Background Art

[0002] Yellow phosphorus is an important basic industrial raw material, mainly used in the fields of chemical industry, pesticide, etc. Yellow phosphorus is usually prepared by electric furnace method, and the whole production process will produce a large amount of phosphorus-containing wastewater, that is, yellow phosphorus production wastewater. In order to recover yellow phosphorus in yellow phosphorus production wastewater and protect the environment, it is necessary to purify the yellow phosphorus production wastewater.

[0003] For a long time, the purification of yellow phosphorus production wastewater has been mainly achieved through sedimentation separation.

[0004] The traditional practice is to build multiple large sedimentation tanks (troughs) on the ground, and these sedimentation tanks are connected through corresponding equipment / pipelines according to the set sedimentation and separation order. For example, the Chinese patent literature discloses the technology named "a wastewater treatment system for yellow phosphorus production enterprises", the publication number is CN 205473189 U, and the publication date is 2016.08.17, the name is "a new process for treating yellow phosphorus industrial wastewater", the publication number is CN 1699206 A, and the publication date is November 23, 2005, and the name is "a process for treating yellow phosphorus wastewater", the publication number is CN107285555 A, and the publication date is October 24, 2017. Obviously, this purification treatment process of building multiple large sedimentation tanks on the ground mainly has the following technical problems: 1. The purification facilities occupy a large area, have high construction costs, and have great difficulty in closed-loop technology; 2. There is a high risk of groundwater contamination; 3. The purification efficiency of the sedimentation and separation process in the sedimentation tank alone is low. In order to meet the requirements of the industry, more sedimentation tanks need to be built to match; 4. The cleaning of each sedimentation tank requires manual work, which is labor-intensive and labor-intensive. 5. The impurity concentration in the clear liquid obtained by the final separation of yellow phosphorus production wastewater purified by sedimentation separation alone is usually above 100 mg / L, which is difficult to reach the ideal technical requirement of ≤40 mg / L. The purification effect of sedimentation separation is not good.

[0005] In view of this, in recent years, the industry has tried to study the reduction of ground sedimentation tanks and the construction of closed-loop purification technologies, such as the technology disclosed in the Chinese patent document named "Yellow Phosphorus Production Wastewater Closed-loop Treatment and Recycling System", with the publication number CN 222411260 U and the publication date of January 28, 2025. This type of technology replaces the traditional sedimentation separation sedimentation tank with sedimentation equipment, and transports the purified cooling water to the yellow phosphorus production equipment, forming a closed cycle of yellow phosphorus production wastewater-purification treatment-yellow phosphorus production, which has significant technical advantages over traditional technical measures.

[0006] However, the technology of publication number CN 222411260 U, the purification process of yellow phosphorus production wastewater is: the supernatant is separated and sent to the cooling water tank through the sedimentation separation of the sedimentation equipment, the middle mixed material is sent to the coagulation tank and the flocculation tank for drug separation through the sedimentation separation of the sedimentation equipment; the supernatant separated by the flocculation tank is sent to the cooling water tank, the flocculated mixed liquid separated by the flocculation tank is sent to the flotation tank; the clear liquid separated by the flotation tank is sent to the cooling water tank, and the mixed liquid separated by the flotation tank is sent to the filter; the clear liquid separated by the filter is sent to the cooling water tank. It can be seen that the water source entering the cooling water tank is separated by different purification and separation equipment in the purification treatment system, at least four ways, and the purification degree of each way is difficult to be consistent, which makes it difficult for the impurity concentration in the cooling water in the cooling water tank to reach the ideal technical requirement of ≤40mg / L, and the separation and purification effect is poor, which will have an adverse effect on the yellow phosphorus production equipment and production process downstream of the closed cycle. The most direct manifestation is that it is easy to cause blockage of the water supply pipeline and reduce the yellow phosphorus collection efficiency. Summary of the invention

[0007] The technical purpose of the present invention is to provide a yellow phosphorus production wastewater circulation purification system which reduces land occupation, has low construction and operation costs, has excellent separation and purification effects, and forms a closed cycle, in view of the particularity of the above-mentioned yellow phosphorus production wastewater purification treatment and the shortcomings of the existing technology.

[0008] The technical purpose of the present invention is achieved by the following technical scheme: a yellow phosphorus production wastewater circulation purification system, the circulation purification system having yellow phosphorus wastewater tanks arranged in sequence along the wastewater treatment process, Multi-stage sedimentation mechanism, concentration and filtration mechanism and clear liquid collection tank; The yellow phosphorus wastewater tank is used to collect yellow phosphorus production wastewater, and the yellow phosphorus wastewater tank is connected to the feed port of the multi-stage sedimentation mechanism through a yellow phosphorus wastewater feeding pipe; The multi-stage sedimentation mechanism has a plurality of deep cone sedimentation machines arranged in series, the discharge port of the multi-stage sedimentation mechanism is connected to the feed port of the concentration and filtration mechanism through a sedimentation floating liquid feeding pipe, and the discharge port of at least one deep cone sedimentation machine at the upstream position of the multi-stage sedimentation mechanism is connected to the yellow phosphorus slurry collection tank through a sedimentation slurry collection pipe, and the discharge ports of the remaining deep cone sedimentation machines are connected to the mud phosphorus collection tank through the sedimentation slurry collection pipe; The liquid discharge port of the concentration and filtration mechanism is connected to the clear liquid collection tank through a concentrated clear liquid collection pipe, and the slurry discharge port of the concentration and filtration mechanism is connected to the mud phosphorus collection tank through a concentrated slurry collection pipe; The clear liquid collecting tank is connected with the phosphorus collecting tower through a water supply pipe.

[0009] The above technical measures are aimed at the particularity of the above yellow phosphorus production wastewater purification treatment. The multi-stage sedimentation mechanism and the concentration and filtration mechanism are arranged in sequence according to the yellow phosphorus wastewater treatment process, so that the yellow phosphorus wastewater in the yellow phosphorus wastewater tank is separated in sequence by the multi-stage sedimentation mechanism and the concentration and filtration mechanism. The separated high-phosphorus slurry enters the yellow phosphorus collection tank, the separated low-phosphorus slurry enters the mud phosphorus collection tank, and the separated clear liquid enters the clear liquid collection tank and is closed and circulated to the phosphorus collection tower through the water supply pipe. It can be seen that the closed-loop purification system constructed by the above technical measures does not need to occupy too much land resources. The multi-stage sedimentation mechanism and the concentration and filtration mechanism that can be supported on the ground replace the traditional multiple large sedimentation tanks on the ground, which greatly reduces the occupation of land resources. The multi-stage sedimentation mechanism and the concentration and filtration mechanism are easy to clean automatically, making the construction and operation costs of the circulation purification system of the above technical measures low. Moreover, the purification system of the above technical measures allows the yellow phosphorus wastewater in the yellow phosphorus wastewater tank to be separated in sequence by the multi-stage sedimentation mechanism and the concentration and filtration mechanism, and the separated clear liquid enters the clear liquid collection tank, without the problem of clear liquid confluence under multi-way separation and purification, so that the purification degree of the clear liquid entering the clear liquid collection tank is relatively constant, thereby achieving excellent separation and purification effects, and enabling the impurity concentration in the clear liquid entering the clear liquid collection tank to reach the ideal technical requirement of ≤40mg / L. Therefore, the closed-loop purification system constructed by the above technical measures has the technical characteristics of greatly reducing land occupation, low construction and operation costs, and excellent separation and purification effects.

[0010] As one of the preferred technical solutions, the clear liquid collection tank is divided into a relatively independent first clear liquid collection tank and a second clear liquid collection tank, and the first clear liquid collection tank and the second clear liquid collection tank are connected to the concentration and filtration mechanism through corresponding concentrated clear liquid collection pipes; The first clear liquid collection tank is connected to the high-temperature phosphorus collection tower through a high-temperature phosphorus collection tower water supply pipe, and is used to supply operating water to the high-temperature phosphorus collection tower; a second steam heating coil is arranged in the first clear liquid collection tank, and the second steam heating coil is used to heat the clear liquid in the first clear liquid collection tank to a temperature corresponding to the operation of the high-temperature phosphorus collection tower; The second clear liquid collection tank is connected to a closed cooling tower via a cooling water supply pipe. The closed cooling tower is used to cool the clear liquid in the second clear liquid collection tank to a temperature corresponding to the operation of the low-temperature phosphorus collection tower, and is connected to the low-temperature phosphorus collection tower via a low-temperature phosphorus collection tower water supply pipe to transport operating water to the low-temperature phosphorus collection tower.

[0011] On the basis of closed circulation, the above technical measures aim at the particularity of the relatively high temperature phosphorus collection tower and the relatively low temperature phosphorus collection tower in the yellow phosphorus production process, and form a targeted configuration of the clear liquid collection tank used for closed circulation, and make the clear liquid collected in the first clear liquid collection tank and the second clear liquid collection tank obtain water of the corresponding process temperature through the corresponding steam heating coil and the closed cooling tower, and the water meeting the corresponding process temperature is sent to the relatively high temperature phosphorus collection tower and the relatively low temperature phosphorus collection tower through the corresponding water supply pipe. It can be seen that the closed circulation purification system constructed by the above technical measures is more in line with the yellow phosphorus production process, which is conducive to ensuring the reliable and efficient implementation of the yellow phosphorus production process.

[0012] Furthermore, the second clear liquid collection tank has a relatively independent closed cooling tower water replenishment tank and cooling water tank; The closed cooling tower water supply tank is connected to the drain pipe and / or cooling water tank of the closed cooling tower, and is connected to the closed cooling tower through the closed cooling tower water supply pipe, and is used to transport heat exchange cooling water to the closed cooling tower; The cooling water tank is connected to the drain pipe of the closed cooling tower, and is connected to the low-temperature phosphorus collecting tower through a low-temperature phosphorus collecting tower water supply pipe.

[0013] The above technical measures are aimed at the particularity of the water used for heat exchange in closed cooling towers, so that the water replenishment of the closed cooling tower forms a self-sufficient closed circulation system with better closed circulation performance.

[0014] As one of the preferred technical solutions, the multiple deep cone settlers of the multi-stage settling mechanism are arranged in series in a structure in which the upstream deep cone settler overflows sequentially to the downstream deep cone settler; A guide plate extending downward at least to the middle of the corresponding settling chamber is arranged at the feed inlet of each deep cone settling machine, and an inclined tube filler is arranged in the settling chamber in the height direction of the guide plate; The yellow phosphorus wastewater entering the multi-stage sedimentation mechanism flows in a bypass path from top to bottom and from bottom to top; Moreover, the feed inlet of the first deep cone sedimentation machine in the multi-stage sedimentation mechanism is provided with a spoiler with a toothed upper edge, and the yellow phosphorus wastewater flows into the diversion channel formed by the guide plate of the first deep cone sedimentation machine after flipping over the spoiler.

[0015] The multi-stage sedimentation mechanism of the above technical measures is composed of a plurality of deep cone sedimentators arranged in series, and the yellow phosphorus wastewater entering the multi-stage sedimentation mechanism forms a flow path with up and down bends, thereby reliably improving the sedimentation separation effect. At the same time, the structure at the feed port of the first deep cone sedimentator can, on the one hand, make the incoming yellow phosphorus wastewater relatively evenly distributed, and on the other hand, can have a certain mixing effect on the reagents contained in the yellow phosphorus wastewater, which is conducive to improving the sedimentation separation effect.

[0016] As one of the preferred technical solutions, a steam heating coil is arranged at the bottom of each deep cone settler in the multi-stage settling mechanism. This technical measure is aimed at the particularity that yellow phosphorus is easy to crystallize in a low temperature environment (≤45°C). The steam heating coil is used to ensure the temperature of the settling separation slurry, avoiding the crystallization blockage of the settling separation slurry due to too low temperature, so as to ensure the stable and long-term operation of the multi-stage settling mechanism.

[0017] Furthermore, the slurry discharge port of each deep cone settler in the multi-stage settling mechanism is a siphon elbow structure connected to the bottom of the corresponding settling chamber. This technical measure can produce adsorption characteristics at the bottom of the corresponding settling chamber, so that the slurry settled to the bottom of the corresponding settling chamber can be effectively adsorbed and discharged, and the slurry discharge effect is significantly better than the direct discharge structure.

[0018] As one of the preferred technical solutions, each deep cone sedimentation machine in the multi-stage sedimentation mechanism has a temperature-adjusting steam pipe that can be connected to a steam pipe and introduce steam into the corresponding sedimentation chamber. This technical measure adjusts the temperature of the yellow phosphorus wastewater in the current corresponding sedimentation chamber by introducing steam to ensure that the yellow phosphorus wastewater in the multi-stage sedimentation mechanism tends to a constant temperature state, which is beneficial to ensuring the sedimentation and separation effect, and to ensuring the stable flow of the yellow phosphorus wastewater in each sedimentation chamber of the multi-stage sedimentation mechanism. It is also beneficial to improve the tar coagulation phenomenon in the yellow phosphorus wastewater, which is more prominent in the case of combined agents, and effectively solves the long-standing legacy problem of scaling caused by tar coagulation in the yellow phosphorus wastewater.

[0019] As one of the preferred technical solutions, a sedimentation float overflow pipe higher than the discharge port is connected to the top of the tail stage deep cone sedimentator in the multi-stage sedimentation mechanism; The sedimentation floating liquid overflow pipe is connected to the yellow phosphorus sewage tank.

[0020] The above technical measures can ensure the stable operation of the entire purification system, especially the multi-stage sedimentation mechanism, through the design of the overflow structure without affecting the purification effect of the final discharged clear liquid.

[0021] As one of the preferred technical solutions, the concentration and filtration mechanism is a parallel arrangement structure of two concentrators; The top of each concentrator is connected with a concentrated clear liquid overflow pipe higher than the liquid discharge port; The concentrated clear liquid overflow pipe is connected to the yellow phosphorus sewage tank.

[0022] The concentration and filtration mechanism of the above technical measures can, on the one hand, effectively cope with the feed flow of the multi-stage sedimentation mechanism, and on the other hand, enable the two concentrators to form a mutually redundant configuration to ensure continuous filtration operation, thereby ensuring the stable operation of the entire purification system, which is especially obvious under the design of the overflow structure.

[0023] As one of the preferred technical solutions, a mixer is connected to the yellow phosphorus wastewater feeding pipe; The mixer is connected to a PAC doser and / or a PAM doser for adding corresponding agents to the yellow phosphorus wastewater transported to the multi-stage sedimentation mechanism; At least one group of flow-turbulating blades is arranged in the mixer, and at least one group of flow-turbulating blades is located downstream of the drug-adding port.

[0024] On the one hand, the above technical measures can enable the yellow phosphorus wastewater entering the multi-stage sedimentation mechanism to carry flocculation agents, so as to reliably improve the separation and purification effects of the multi-stage sedimentation mechanism and the concentration and filtration mechanism, especially the multi-stage sedimentation mechanism; on the other hand, the design structure of the mixer can ensure that the added agents are automatically and evenly mixed during the transportation of the yellow phosphorus wastewater.

[0025] The beneficial technical effect of the present invention is: the above technical measures are aimed at the special treatment of the yellow phosphorus production wastewater, and the multi-stage sedimentation mechanism and the concentration and filtration mechanism are arranged in sequence according to the yellow phosphorus wastewater treatment process, so that the yellow phosphorus wastewater in the yellow phosphorus wastewater tank is separated in sequence by the multi-stage sedimentation mechanism and the concentration and filtration mechanism, and the separated high-phosphorus slurry enters the recyclable yellow phosphorus collection tank, the separated low-phosphorus slurry enters the mud phosphorus collection tank that can be reused, and the separated clear liquid enters the clear liquid collection tank and is closed and circulated to the phosphorus collection tower through the water supply pipe. Therefore, the closed-loop purification system constructed by the above technical measures does not need to occupy too much land resources, and replaces the traditional multiple large sedimentation tanks on the ground with multi-stage sedimentation mechanisms and concentration and filtration mechanisms that can be supported on the ground, which greatly reduces the occupation of land resources, and the multi-stage sedimentation mechanism and the concentration and filtration mechanism are easy to automatically clean, so that the construction and operation costs of the circulation purification system of the above technical measures are low. Moreover, the purification system of the above technical measures allows the yellow phosphorus wastewater in the yellow phosphorus wastewater tank to be separated in sequence by a multi-stage sedimentation mechanism and a concentration and filtration mechanism, and the separated clear liquid enters the clear liquid collecting tank. The source of the clear liquid collected by the clear liquid collecting tank is relatively unique, and there is no technical problem of clear liquid confluence under multi-path separation and purification. The purification degree of the clear liquid entering the clear liquid collecting tank is relatively constant, thereby achieving excellent separation and purification effects, and can make the impurity concentration in the clear liquid entering the clear liquid collecting tank significantly lower than the ideal technical requirement of ≤40mg / L, and can reach ≤10mg / L. After testing, it is usually 3 to 10mg / L.

[0026] In summary, the above technical measures have the following technical advantages compared with the traditional purification and separation technologies of Publication No. CN 205473189 U, Publication No. CN 1699206 A and Publication No. CN 107285555 A: 1. The purification facility occupies a small area, is easy to build, and has a low construction cost, and can effectively form a closed cycle; 2. Low risk of groundwater pollution, high environmental protection and safety; 3. The multi-stage sedimentation mechanism and the concentration and filtration mechanism work together to achieve high purification efficiency and enable continuous purification production; 4. The multi-stage sedimentation mechanism and concentration and filtration mechanism can achieve automatic cleaning, basically no need for manual cleaning, and the operation and management costs are low; 5. The multi-stage sedimentation mechanism and the concentration and filtration mechanism work together to achieve excellent purification effects. The impurity concentration in the clear liquid obtained by final separation is far lower than the ideal technical requirement of ≤40mg / L, usually ≤10mg / L.

[0027] Compared with the technology of publication number CN 222411260 U, the above-mentioned technical measures have a unique purification path under the cooperation of the upstream and downstream of the multi-stage sedimentation mechanism and the concentration and filtration mechanism, that is, the clear liquid entering the clear liquid collecting tank only comes from the concentration and filtration mechanism, and there is no technical problem of clear liquid confluence under multi-path separation and purification, so that the purification degree of the clear liquid entering the clear liquid collecting tank is relatively constant, thereby achieving excellent separation and purification effect, and can make the impurity concentration of the clear liquid entering the clear liquid collecting tank far lower than the ideal technical requirement of ≤40mg / L, usually ≤10mg / L; and the molding structure of the whole purification system is simpler and more compact.

[0028] Therefore, the closed-loop purification system constructed by the above-mentioned technical measures has the technical characteristics of greatly reducing land occupation, low construction and operation costs, and excellent separation and purification effects, with significant technical and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A structural schematic diagram of the present invention.

[0030] Figure 2 for Figure 1 A partial enlarged view of the yellow phosphorus sewage tank.

[0031] Figure 3 for Figure 1 A partial enlarged view of the multi-stage sedimentation mechanism.

[0032] Figure 4 for Figure 3 Enlarged view of the bottom structure of the medium-deep cone settler.

[0033] Figure 5 for Figure 3 Enlarged view of the middle and upper structure of the medium-depth cone settler.

[0034] Figure 6 for Figure 1 A partial enlarged view of the clear liquid collection tank.

[0035] Meaning of the codes in the figure: 1—yellow phosphorus wastewater tank; 11—yellow phosphorus wastewater collection pipe; 12—yellow phosphorus wastewater feeding pipe; 13—mixer; 14—PAC doser; 15—PAM doser; 2—multi-stage sedimentation mechanism; 21—deep cone sedimentation machine; 22—precipitation slurry collection pipe; 23—steam heating coil 1; 24—temperature regulating steam connection pipe; 25—sedimentation floating liquid feeding pipe; 26—sedimentation floating liquid overflow pipe; 27—guide plate; 28—spoiler; 3—concentration and filtration mechanism; 31—concentrator; 32—concentrated slurry collection pipe; 33—concentrated clear liquid collection pipe; 34—concentrated clear liquid overflow pipe; 4—Yellow phosphorus slurry collection tank; 5—mud phosphorus collection tank; 51—mud phosphorus circulation pipe; 6—clear liquid collection tank; 61—clear liquid first collection tank; 62—steam heating coil second; 63—high temperature phosphorus collection tower water supply pipe; 64—clear liquid second collection tank; 65—cooling water supply pipe; 66—closed cooling tower; 67—closed cooling tower water supply tank; 68—cooling water tank; 69—low temperature phosphorus collection tower water supply pipe; 610—closed cooling tower water supply pipe; 7—High temperature phosphorus collection tower; 8—Low temperature phosphorus collection tower; 9—Compressed air supply mechanism. DETAILED DESCRIPTION

[0036] The present invention relates to the field of environmentally friendly treatment of industrial wastewater, and specifically to a yellow phosphorus production wastewater recycling purification system. The main technical solution of the present invention is specifically described below in conjunction with a plurality of embodiments. Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 The technical solution of the present invention is explained clearly and in detail; although other embodiments are not separately drawn with drawings, their main structures can still refer to the drawings of embodiment 1.

[0037] It should be noted that the drawings of the present invention are schematic, and unnecessary details have been simplified to clarify the technical purpose of the present invention, so as to avoid blurring the technical solution of the present invention that contributes to the prior art. In addition, the expressions "approximately", "substantially" and the like regarding quantity or matching relationship in the following text mean that reasonable assembly errors and processing errors in the industry are allowed to exist, and do not literally express absolute quantities or matching relationships.

[0038] Example 1 See also Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the present invention is a closed-loop purification system for yellow phosphorus production wastewater, which includes a yellow phosphorus wastewater tank 1, a multi-stage sedimentation mechanism 2, a concentration and filtration mechanism 3, and a clear liquid collection tank 6 arranged in sequence along the wastewater treatment process. The yellow phosphorus wastewater from the yellow phosphorus production line enters the yellow phosphorus wastewater tank 1, and the yellow phosphorus wastewater in the yellow phosphorus wastewater tank 1 is subjected to sedimentation separation by the multi-stage sedimentation mechanism 2 and concentration and filtration by the concentration and filtration mechanism 3. The finally formed filtered clear liquid enters the clear liquid collection tank 6, and is then transported from the clear liquid collection tank 6 to the phosphorus collection tower, forming a closed-loop purification process.

[0039] Specifically, Figure 1 and Figure 2 As shown, the yellow phosphorus sewage tank 1 is a pit-type structure, which is used to collect the yellow phosphorus sewage generated by the entire yellow phosphorus production line. A shielding cover plate is arranged at the notch of the yellow phosphorus sewage tank 1, and necessary manholes, exhaust ports, etc. are arranged on the cover plate.

[0040] like Figure 1 and Figure 2 As shown, the yellow phosphorus wastewater tank 1 is connected to the feed port of the multi-stage sedimentation mechanism 2 through the yellow phosphorus wastewater feeding pipe 12. A submersible pump is connected to the end of the yellow phosphorus wastewater feeding pipe 12 extending into the yellow phosphorus wastewater tank 1 to pressure-pump the yellow phosphorus wastewater in the yellow phosphorus wastewater tank 1 to the multi-stage sedimentation mechanism 2 through the yellow phosphorus wastewater feeding pipe 12. A valve for controlling the on / off state of the yellow phosphorus wastewater feeding pipe 12 is connected to the yellow phosphorus wastewater feeding pipe 12. To realize automated operation, the valve is preferably an electromagnetically controlled valve; the valve is located upstream of the mixer 13 described below.

[0041] like Figure 1 and Figure 2As shown, in order to flocculate the yellow phosphorus wastewater entering the multi-stage sedimentation mechanism 2 and improve the sedimentation and separation effect, a mixer 13 is connected to the yellow phosphorus wastewater feeding pipe 12, and the mixer 13 is connected to a PAC doser 14 and a PAM doser 15. The PAC doser 14 and the PAM doser 15 inject corresponding reagents into the yellow phosphorus wastewater feeding pipe 12 through the mixer 13, so that the corresponding reagents are mixed in the yellow phosphorus wastewater transported by the yellow phosphorus wastewater feeding pipe 12. In order to improve the mixing effect, three groups of flow disturbance blades are arranged along the flow direction spacing in the mixer 13, and each group of flow disturbance blades constitutes a grid hole type flow channel. The first group of flow disturbance blades is located at the upstream of the first dosing port, and is used to block the flow disturbance of the transported yellow phosphorus wastewater, so that the yellow phosphorus wastewater collides here and flows downstream by detour, and the yellow phosphorus wastewater is dispersed so that the reagents can be relatively evenly added. The second set of flow-turbulating blades is located downstream of the first dosing port and upstream of the second dosing port (i.e., the area between the two dosing ports), and is used to block and disturb the delivered yellow phosphorus wastewater and the contained chemicals, so that the yellow phosphorus wastewater and the contained chemicals collide here and flow around to the downstream, and the added chemicals collide and mix, and disperse the yellow phosphorus wastewater so that the chemicals added by the next dosing port can be relatively evenly added. The third set of flow-turbulating blades is located downstream of the second dosing port, and is used to block and disturb the delivered yellow phosphorus wastewater and the contained chemicals, so that the yellow phosphorus wastewater and the contained chemicals collide here and flow around to the downstream, and the added chemicals collide and mix.

[0042] The PAC doser 14 and the PAM doser 15 have the same molding structure and are supported on the ground by a frame. They are mainly composed of a medicine tank, a submersible pump and corresponding pipelines. The medicine tank has a stirring structure, and the corresponding pipeline is connected to a valve that controls its on / off state. In order to realize automatic operation, the valve is preferably an electromagnetic control valve.

[0043] like Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, the multi-stage sedimentation mechanism 2 is supported on the ground by a frame. The multi-stage sedimentation mechanism 2 is a series structure of multiple deep cone sedimentators 21. These deep cone sedimentators 21 are arranged in series in a structure in which the upstream deep cone sedimentator overflows to the downstream deep cone sedimentator in sequence, that is, the yellow phosphorus wastewater entering the first deep cone sedimentator overflows to the second deep cone sedimentator after filling the sedimentation chamber, and overflows to the third deep cone sedimentator after filling the sedimentation chamber of the second deep cone sedimentator, and so on. In order to form integrity and easy arrangement, multiple deep cone sedimentators 21 are arranged in the same shell, and adjacent deep cone sedimentators 21 are separated by a cavity partition to form a relatively independently arranged sedimentation chamber. The top of the cavity partition forms an overflow channel between adjacent deep cone sedimentators 21. Each deep cone sedimentator 21 has a relatively independent conical bottom connected to the corresponding sedimentation chamber, and the conical bottom of each deep cone sedimentator 21 has a slurry discharge port.

[0044] In order to make the yellow phosphorus wastewater entering the corresponding deep cone sedimentation machine 21 be fully precipitated as much as possible and improve the sedimentation and separation effect, a guide plate 27 extending downward to the middle and lower part of the corresponding sedimentation chamber is arranged at the feed port of each deep cone sedimentation machine 21. The guide plate 27 separates the feed channel and the sedimentation chamber, so that the continuous feed is diverted to the lower part of the corresponding sedimentation chamber, and then filled and overflowed. The guide plate 27 is arranged with an inclined tube filler in the sedimentation chamber in the height direction to block and filter out heavy substances in the yellow phosphorus wastewater, such as yellow phosphorus and mud phosphorus. Based on the structure of the aforementioned deep cone sedimentation machine 21 and the series structure of multiple deep cone sedimentation machines 21, the yellow phosphorus wastewater entering the multi-stage sedimentation mechanism 2 flows in a bypass path from top to bottom and from bottom to top. In addition, in order to improve the distribution of the yellow phosphorus wastewater entering the first deep cone sedimentation machine 21 and further mix the reagents contained in the yellow phosphorus wastewater, a spoiler 28 (such as Figure 5 As shown in the figure, the upper edge of the spoiler 28 is a toothed structure, and the yellow phosphorus wastewater flowing thereto first overflows laterally in the groove formed by the spoiler 28, and then flows into the guide channel formed by the guide plate 27 of the first deep cone sedimentator 21 through the toothed structure on the upper edge of the upturned spoiler 28.

[0045] Since the yellow phosphorus and muddy phosphorus impurities in the yellow phosphorus wastewater are prone to scaling at low temperatures, in order to reduce the scaling and clogging of the sedimentation chamber by the yellow phosphorus and muddy phosphorus impurities in the yellow phosphorus wastewater during sedimentation separation, a temperature-adjusting steam pipe 24 (such as a steam pipe 24) is arranged at the bottom of each deep cone sedimentator 21 and can be connected to a steam pipe to introduce steam into the corresponding sedimentation chamber. Figure 4 As shown in the figure, the yellow phosphorus wastewater in the corresponding sedimentation chamber is heated by the introduced steam, so that the yellow phosphorus wastewater tends to be in a constant temperature state for sedimentation and separation, thereby reducing scaling.

[0046] As described above, the yellow phosphorus slurry and mud phosphorus slurry separated by sedimentation are arranged in the corresponding collection tank through the discharge port at the bottom of each deep cone sedimentator 21, and the floating liquid separated by sedimentation is transported to the concentration and filtration mechanism 3 through the discharge port of the tail deep cone sedimentator 21. Therefore, based on the characteristic that yellow phosphorus is easy to crystallize at low temperature (usually ≤45°C), a steam heating coil 23 (such as Figure 4 As shown in FIG. 1 , the steam heating coil 23 is used to heat the slurry (yellow phosphorus slurry, mud phosphorus slurry) separated by sedimentation to a temperature greater than the crystallization point (generally the heating temperature is 65° C.). The heating by the steam heating coil 23 is only a tubular heat exchange and does not involve the phenomenon of steam directly passing into the slurry. This is because it is difficult to directly pass steam into the slurry separated by sedimentation for heating. Therefore, the structure of the steam heating coil 23 is basically independent of the temperature control structure for directly passing steam.

[0047] As described above, the bottom of the sedimentation chamber of each deep cone sedimentator 21 of the multi-stage sedimentation mechanism 2 will form sedimentation and separation slurry, so each deep cone sedimentator 21 needs to form an independent slurry discharge port at the bottom, which is connected to a corresponding sedimentation slurry collection pipe 22. In order to improve the discharge effect of the slurry at the bottom of the sedimentation chamber and reduce blockage, the part of the sedimentation slurry collection pipe 22 extending into the corresponding deep cone sedimentator 21 is a siphon elbow structure connected to the bottom of the corresponding sedimentation chamber (such as Figure 4 ). A valve for controlling the on / off state of each sedimentation slurry collection pipe 22 is connected to each of the sedimentation slurry collection pipes 22. To realize automated operation, the valve is preferably an electromagnetically controlled valve; the valve is located outside the corresponding deep cone settler 21.

[0048] Due to the structural form and working characteristics of the above-mentioned multi-stage sedimentation mechanism 2, the concentration of yellow phosphorus contained in the slurry separated by sedimentation of the deep cone sedimentation machine 21 arranged upstream is significantly greater than the yellow phosphorus contained in the slurry separated by sedimentation of the deep cone sedimentation machine 21 arranged downstream. In order to achieve effective recovery of yellow phosphorus and reduce the technical difficulty of processing the collected yellow phosphorus, the slurry with a relatively high yellow phosphorus concentration is collected separately for yellow phosphorus recovery, and the slurry with a relatively low yellow phosphorus concentration is collected separately for environmentally friendly treatment. Therefore, the discharge ports of the first deep cone sedimentation machine and the second deep cone sedimentation machine at the upstream position of the above-mentioned multi-stage sedimentation mechanism 2 are respectively connected to the yellow phosphorus slurry collection tank 4 through the corresponding sedimentation slurry collection pipes 22, and the discharge ports of the remaining downstream deep cone sedimentation machines are connected to the mud phosphorus collection tank 5 (such as) through the corresponding sedimentation slurry collection pipes 22. Figure 1 and Figure 3 as shown).

[0049] The yellow phosphorus slurry collecting tank 4 is a pit-type structure, which is used to collect the sedimentation separation slurry discharged by the deep cone sedimentation machine 21 at the upstream of the multi-stage sedimentation mechanism 2, i.e., the yellow phosphorus slurry. A shielding cover plate is provided at the notch of the yellow phosphorus slurry collecting tank 4, and necessary manholes and the like are provided on the cover plate. In order to facilitate the discharge and recovery of the yellow phosphorus slurry in the yellow phosphorus slurry collecting tank 4, a mud pump is installed in the yellow phosphorus slurry collecting tank 4.

[0050] The mud phosphorus collection tank 5 is a pit-type structure, which is used to collect the sedimentation separation slurry discharged by the deep cone sedimentation machine 21 downstream of the multi-stage sedimentation mechanism 2, that is, the mud phosphorus slurry. A shielding cover plate is provided at the notch of the mud phosphorus collection tank 5, and necessary manholes are provided on the cover plate. In order to facilitate the discharge of the mud phosphorus slurry in the mud phosphorus collection tank 5 for environmental protection treatment (such as baking bricks, etc.), a mud pump is installed in the mud phosphorus collection tank 5. Of course, in order to further improve the purification effect and recycle as much yellow phosphorus in the mud phosphorus slurry as possible, the mud phosphorus collection tank 5 is connected to a mud phosphorus circulation pipe 51, and the end of the mud phosphorus circulation pipe 51 extending into the mud phosphorus collection tank 5 is connected to a mud pump, and the other end of the mud phosphorus circulation pipe 51 is connected to the feed inlet of the first deep cone sedimentation machine 21 of the multi-stage sedimentation mechanism 2, so as to circulate and purify the mud phosphorus collected in the mud phosphorus collection tank 5.

[0051] The discharge port of the multi-stage sedimentation mechanism 2, i.e., the discharge port of the tail stage deep cone sedimentation machine 21, is connected to the feed port of the concentration and filtration mechanism 3 through the sedimentation float feeding pipe 25. At the same time, in order to ensure the stable operation of the multi-stage sedimentation mechanism 2, an overflow port higher than the discharge port is provided at the top of the tail stage deep cone sedimentation machine 21 in the multi-stage sedimentation mechanism 2, and a sedimentation float overflow pipe 26 higher than the discharge port is connected to the overflow port, and the sedimentation float overflow pipe 26 is connected to the yellow phosphorus sewage tank 1, so that the yellow phosphorus sewage that cannot be discharged into the concentration and filtration mechanism 3 and is higher than the normal purification flow path is returned to the yellow phosphorus sewage tank 1, so as to realize the circulation purification under the stable operation condition of the system.

[0052] like Figure 1 and Figure 6 As shown, the concentration and filtration mechanism 3 is supported on the ground by a frame. The concentration and filtration mechanism 3 is a parallel arrangement structure of two concentrators 31, and each feed port is connected to the sedimentation and floating liquid feeding pipe 25 of the above-mentioned multi-stage sedimentation mechanism 2, and the corresponding sedimentation and floating liquid feeding pipe 25 respectively transports the floating liquid material after sedimentation and separation to the two concentrators 31. The two concentrators 31 of the concentration and filtration mechanism 3 can be synchronously operated or redundant standby operated according to the working conditions, usually redundant standby operation, so a valve for controlling on / off is connected to the sedimentation and floating liquid feeding pipe 25 at the feed port of each concentrator 31. In order to realize automatic operation, the valve is preferably an electromagnetic control valve.

[0053] The discharge ports of the two concentrators 31 of the concentrating and filtering mechanism 3 are connected to the clear liquid collection tank 6 through their respective concentrated clear liquid collection pipes 33. Each concentrated clear liquid collection pipe 33 is connected to a negative pressure pump and a valve for controlling the on / off of the concentrated clear liquid collection pipe 33. To achieve automated operation, the valve is preferably an electromagnetically controlled valve. The slurry discharge ports of the two concentrators 31 of the concentrating and filtering mechanism 3 are connected to the above-mentioned mud phosphorus collection tank 5 through their respective concentrated slurry collection pipes 32. Each concentrated slurry collection pipe 32 is connected to a valve for controlling its on / off. To achieve automated operation, the valve is preferably an electromagnetically controlled valve.

[0054] Each concentrator 31 of the above-mentioned concentrating and filtering mechanism 3 is a conventional high-efficiency concentrator, and a plurality of hollow structure filter plates are arranged in its filter chamber. The outside of each filter plate has a filtering structure and filter cloth. The top of each filter plate is connected to a filtrate manifold, and the tail end of the filtrate manifold is connected to a concentrated clear liquid collection pipe 33, so as to filter and separate the slurry entering the filter chamber.

[0055] In order to ensure the stable operation of each concentrator 31 of the concentration and filtration mechanism 3, an overflow port higher than the discharge port is opened at the top of each concentrator 31, and a concentrated clear liquid overflow pipe 34 higher than the discharge port is connected to the overflow port. The concentrated clear liquid overflow pipe 34 is connected to the yellow phosphorus sewage tank 1, so that the yellow phosphorus sewage that cannot be concentrated and filtered is returned to the yellow phosphorus sewage tank 1, so as to realize the circulation purification under the stable operation condition of the system.

[0056] like Figure 1 and Figure 6 As shown, the clear liquid collecting tank 6 is divided into a relatively independent first clear liquid collecting tank 61 and a second clear liquid collecting tank 64, and the second clear liquid collecting tank 64 has a relatively independent closed cooling tower water replenishment tank 67 and a cooling water tank 68. The first clear liquid collecting tank 61, the second clear liquid collecting tank 64, the closed cooling tower water replenishment tank 67 and the cooling water tank 68 are relatively independent pit structures, each having a cover plate.

[0057] The first clear liquid collecting tank 61 and the second clear liquid collecting tank 64 are connected to the concentration and filtering mechanism 3 through corresponding concentrated clear liquid collecting pipes 33 , respectively.

[0058] The first clear liquid collection tank 61 is connected to the high-temperature phosphorus collecting tower 7 through the high-temperature phosphorus collecting tower water supply pipe 63. The end of the high-temperature phosphorus collecting tower water supply pipe 63 extending into the first clear liquid collection tank 61 is connected to a submersible pump. Under the pumping action of the submersible pump, the high-temperature phosphorus collecting tower water supply pipe 63 is used to transport operating water to the high-temperature phosphorus collecting tower 7. A valve for controlling its on / off is connected to the high-temperature phosphorus collecting tower water supply pipe 63. In order to realize automated operation, the valve is preferably an electromagnetic control valve. A steam heating coil 2 62 is arranged in the first clear liquid collection tank 61. The steam heating coil 2 62 is used to heat the clear liquid in the first clear liquid collection tank 61 to a temperature corresponding to the operation of the high-temperature phosphorus collecting tower 7 (generally 70-80°C).

[0059] The second clear liquid collection tank 64 is connected to a closed cooling tower 66 through a cooling water supply pipe 65. The end of the cooling water supply pipe 65 extending into the second clear liquid collection tank 64 is connected to a submerged pump. Under the pumping action of the submerged pump, the cooling water supply pipe 65 delivers cooling water to the closed cooling tower 66. The closed cooling tower 66 is installed on the ground. The closed cooling tower 66 is used to cool the clear liquid in the second clear liquid collection tank 64 to a temperature corresponding to the operation of the low-temperature phosphorus collection tower 8 (generally 20 to 30°C). The drain pipe of the closed cooling tower 66 is connected to the cooling water tank 68 to deliver the cooled water to the cooling water tank 68.

[0060] The cooling water tank 68 is connected to the low-temperature phosphorus collecting tower 8 through a low-temperature phosphorus collecting tower water supply pipe 69. The end of the low-temperature phosphorus collecting tower water supply pipe 69 extending into the cooling water tank 68 is connected to a submersible pump. Under the pumping action of the submersible pump, the low-temperature phosphorus collecting tower water supply pipe 69 is used to transport working water to the low-temperature phosphorus collecting tower 8. A valve for controlling the on / off of the low-temperature phosphorus collecting tower water supply pipe 69 is connected to the low-temperature phosphorus collecting tower water supply pipe 69. In order to realize automatic operation, the valve is preferably an electromagnetic control valve.

[0061] The closed cooling tower water supply tank 67 is used to replenish working water to the closed cooling tower 66. The cooling water in the closed cooling tower water supply tank 67 can be external water (preferred), or it can be the drainage of the closed cooling tower 66 or the cooling water tank 68 after further cooling. Based on the heat exchange requirements, the cooling water temperature in the closed cooling tower water supply tank 67 should be significantly lower than the clear liquid temperature in the clear liquid second collection tank 64. The closed cooling tower water supply tank 67 is connected to the closed cooling tower 66 through the closed cooling tower water supply pipe 610. The end of the closed cooling tower water supply pipe 610 extending into the closed cooling tower water supply tank 67 is connected to a submersible pump. Under the pumping action of the submersible pump, the closed cooling tower water supply pipe 610 is used to transport working water to the closed cooling tower 66.

[0062] Of course, in order to adjust and control the entire purification system, the high-temperature phosphorus collection tower water supply pipe 63 and the low-temperature phosphorus collection tower water supply pipe 69 are respectively led out with other independently controllable branch pipes, such as a branch pipe for electric furnace water, a branch pipe for slag tank water replenishment, a branch pipe for refining and rinsing water replenishment, etc.

[0063] In order to ensure the normal operation of the above-mentioned concentration and filtration mechanism 3 and back-blow cleaning of the filter cloth, the above-mentioned purification system also has an air pressure supply mechanism 9, which is connected to each concentrator 31 of the concentration and filtration mechanism 3 through an on / off controllable air supply pipeline.

[0064] Example 2 The other contents of this embodiment are the same as those of Embodiment 1, except that: The dosing equipment in the purification system is only a single PAC doser or PAM doser; Correspondingly, the turbulent blades in the mixer are arranged in two groups with a spacing before and after the dosing port.

[0065] Example 3 The other contents of this embodiment are the same as those of Embodiment 1, except that: The mud-phosphorus circulation pipe between the mud-phosphorus collection tank and the multi-stage sedimentation mechanism is eliminated.

[0066] Of course, the corresponding function will be eliminated.

[0067] Example 4 The other contents of this embodiment are the same as those of Embodiment 1, except that: The spoiler at the feed inlet of the first deep cone settler in the multi-stage sedimentation mechanism is eliminated.

[0068] Of course, the corresponding function will be eliminated.

[0069] Example 5 The other contents of this embodiment are the same as those of Embodiment 1, except that: The slurry discharge port at the bottom of each deep cone settler in the multi-stage sedimentation mechanism is a straight discharge pipe structure.

[0070] Of course, the corresponding siphon function is eliminated.

[0071] The above embodiments are only used to illustrate the present invention, but not to limit it.

[0072] Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the above embodiments or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not deviate the essence of the corresponding technical solutions from the spirit and scope of the present invention.

Claims

1. A yellow phosphorus production wastewater circulation purification system, characterized in that: The circulation purification system comprises a yellow phosphorus sewage tank (1) arranged in sequence along the sewage treatment process, A multi-stage sedimentation mechanism (2), a concentration and filtration mechanism (3) and a clear liquid collection tank (6); The yellow phosphorus wastewater tank (1) is used to collect yellow phosphorus production wastewater, and the yellow phosphorus wastewater tank (1) is connected to the feed port of the multi-stage sedimentation mechanism (2) via a yellow phosphorus wastewater feeding pipe (12); The multi-stage sedimentation mechanism (2) comprises a plurality of deep cone sedimentators (21) arranged in series, the liquid discharge port of the multi-stage sedimentation mechanism (2) being connected to the feed port of the concentration and filtration mechanism (3) via a sedimentation floating liquid feeding pipe (25), and the slurry discharge port of at least one deep cone sedimentator (21) at an upstream position of the multi-stage sedimentation mechanism (2) being connected to a yellow phosphorus slurry collection tank (4) via a sedimentation slurry collection pipe (22), and the slurry discharge ports of the remaining deep cone sedimentators (21) being connected to a mud phosphorus collection tank (5) via a sedimentation slurry collection pipe (22); The liquid discharge port of the concentration and filtration mechanism (3) is connected to the clear liquid collection tank (6) via a concentrated clear liquid collection pipe (33), and the slurry discharge port of the concentration and filtration mechanism (3) is connected to the sludge phosphorus collection tank (5) via a concentrated slurry collection pipe (32); The clear liquid collection tank (6) is connected to the phosphorus collection tower via a water supply pipe.

2. The yellow phosphorus production wastewater circulation purification system according to claim 1, characterized in that: The clear liquid collecting tank (6) is divided into a relatively independent first clear liquid collecting tank (61) and a second clear liquid collecting tank (64), and the first clear liquid collecting tank (61) and the second clear liquid collecting tank (64) are connected to the concentration and filtering mechanism (3) via corresponding concentrated clear liquid collecting pipes (33); The first clear liquid collecting tank (61) is connected to the high-temperature phosphorus collecting tower (7) via a high-temperature phosphorus collecting tower water supply pipe (63) and is used to supply operating water to the high-temperature phosphorus collecting tower (7); a second steam heating coil (62) is arranged in the first clear liquid collecting tank (61), and the second steam heating coil (62) is used to heat the clear liquid in the first clear liquid collecting tank (61) to a temperature corresponding to the operating temperature of the high-temperature phosphorus collecting tower (7); The second clear liquid collecting tank (64) is connected to a closed cooling tower (66) via a cooling water supply pipe (65). The closed cooling tower (66) is used to cool the clear liquid in the second clear liquid collecting tank (64) to a temperature corresponding to the operation of the low-temperature phosphorus collecting tower (8). The closed cooling tower (66) is connected to the low-temperature phosphorus collecting tower (8) via a low-temperature phosphorus collecting tower water supply pipe (69) to supply operating water to the low-temperature phosphorus collecting tower (8).

3. The yellow phosphorus production wastewater circulation purification system according to claim 2, characterized in that: The second clear liquid collecting tank (64) has a relatively independent closed cooling tower water replenishment tank (67) and a cooling water tank (68); The closed cooling tower water supply tank (67) is connected to the drainage pipe and / or cooling water tank (68) of the closed cooling tower (66), and is connected to the closed cooling tower (66) via a closed cooling tower water supply pipe (610), and is used to transport heat exchange cooling water to the closed cooling tower (66); The cooling water tank (68) is connected to the drainage pipe of the closed cooling tower (66), and is connected to the low-temperature phosphorus collection tower (8) via a low-temperature phosphorus collection tower water supply pipe (69).

4. The yellow phosphorus production wastewater circulation purification system according to claim 1, characterized in that: The multiple deep cone settlers (21) of the multi-stage settling mechanism (2) are arranged in series in a structure in which the upstream deep cone settler overflows sequentially to the downstream deep cone settler; A guide plate (27) extending downward at least to the middle of the corresponding settling chamber is arranged at the feed inlet of each deep cone settling machine (21), and an inclined tube filler is arranged in the settling chamber in the height direction of the guide plate (27); The yellow phosphorus wastewater entering the multi-stage sedimentation mechanism (2) flows in a bypass path from top to bottom and from bottom to top; Furthermore, the feed inlet of the first deep cone sedimentation machine (21) in the multi-stage sedimentation mechanism (2) is provided with a spoiler (28) whose upper edge is a toothed structure, and the yellow phosphorus wastewater flows thereinto, flipping over the spoiler (28) and flowing into the guide channel formed by the guide plate (27) of the first deep cone sedimentation machine (21).

5. The yellow phosphorus production wastewater circulation purification system according to claim 1 or 4, characterized in that: A steam heating coil (23) is arranged at the bottom of each deep cone settler (21) in the multi-stage settling mechanism (2).

6. The yellow phosphorus production wastewater circulation purification system according to claim 5, characterized in that: The slurry discharge port of each deep cone settler (21) in the multi-stage settling mechanism (2) is a siphon elbow structure connected to the bottom of the corresponding settling chamber.

7. The yellow phosphorus production wastewater circulation purification system according to claim 1 or 4, characterized in that: Each deep cone settler (21) in the multi-stage settling mechanism (2) has a temperature-adjusting steam pipe (24) that can be connected to a steam pipe and that can introduce steam into a corresponding settling chamber.

8. The yellow phosphorus production wastewater circulation purification system according to claim 1 or 4, characterized in that: A sedimentation floating liquid overflow pipe (26) higher than the liquid discharge port is connected to the top of the tail platform deep cone sedimentator (21) in the multi-stage sedimentation mechanism (2); The sedimentation float overflow pipe (26) is connected to the yellow phosphorus sewage tank (1).

9. The yellow phosphorus production wastewater circulation purification system according to claim 1, characterized in that: The concentration and filtration mechanism (3) is a parallel arrangement structure of two concentrators (31); The top of each concentrator (31) is connected to a concentrated clear liquid overflow pipe (34) higher than the liquid discharge port; The concentrated clear liquid overflow pipe (34) is connected to the yellow phosphorus sewage tank (1).

10. The yellow phosphorus production wastewater circulation purification system according to claim 1, characterized in that: The yellow phosphorus wastewater feeding pipe (12) is connected to a mixer (13); The mixer (13) is connected to a PAC doser (14) and / or a PAM doser (15) for adding corresponding agents to the yellow phosphorus wastewater transported to the multi-stage sedimentation mechanism (2); At least one group of flow-turbulating blades is arranged in the mixer (13), and at least one group of flow-turbulating blades is located downstream of the drug-adding port.

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