Green energy-saving treatment device for tungsten smelting solution containing tungsten, molybdenum and ammonia nitrogen

Abstract

The utility model relates to the technical field of tungsten smelting solution treatment, in particular to a green energy-saving treatment device for tungsten smelting solution containing tungsten, molybdenum and ammonia nitrogen, which comprises a two-section adsorption system, an automatic feedback calcium hydroxide adding system, an efficient energy-saving preheating system, a steam direct heating and self-control tower top cold spraying system and a water condensation ammonia and air cooling circulating water system. According to the utility model, the extraction of low-concentration tungsten and molybdenum is completed through the two sections of adsorption systems, the pH value is accurately adjusted through the solution automatic feedback calcium hydroxide adding system, then the calcium slag removal is completed by utilizing the efficient sedimentation solid removal system, and the waste heat utilization and the efficient extraction of low-concentration tungsten and molybdenum are realized by utilizing the efficient energy-saving preheating system again. Meanwhile, deep removal and resource utilization of free ammonia in the solution are completed, and the benefits of energy conservation, consumption reduction and green emission reduction are remarkable.

Description

Technical Field

[0001] The utility model relates to the technical field of tungsten smelting solution treatment, in particular to a green energy-saving treatment device for tungsten smelting solution containing tungsten, molybdenum and ammonia nitrogen. Background Art

[0002] Tungsten smelting is mainly for the preparation of ammonium paratungstate (APT), which requires the introduction of ammonia water or ammonium salts. This process produces a large amount of wastewater containing ammonia nitrogen and low-concentration tungsten and molybdenum, including the first-stage liquid, third-stage liquid, and fourth-stage liquid produced by the ion exchange desorption process, the washing water of the exchange column after desorption, the mother liquor of ammonium tungstate crystallization, APT washing water, evaporation crystallization condensate water, etc. This type of wastewater is produced in large quantities and contains a high concentration of ammonia nitrogen and low concentrations of tungsten and molybdenum. It is difficult to treat and has a high utilization cost, which seriously limits the efficient and green utilization of resources. Therefore, it is urgent to design new treatment equipment and processes to improve the recovery rate of tungsten and molybdenum, deeply remove ammonia nitrogen and complete resource utilization.

[0003] In order to solve the problem of deep removal of ammonia nitrogen and resource utilization of ammonia nitrogen wastewater containing low concentrations of tungsten and molybdenum in tungsten smelting, researchers at home and abroad have developed a variety of treatment technologies, which are mainly divided into four categories. The ammonia nitrogen is removed by using oxidants (such as sodium hypochlorite, sodium chlorate, calcium perchlorate, etc.), and then the tungsten and molybdenum in the solution are recovered. This process is very easy to release chlorine and other toxic and harmful gases, the working environment is harsh, the risk of secondary environmental pollution is high, the reagent consumption is large, and the treatment cost is high; the MAP precipitation method uses ammonium magnesium phosphate to remove ammonia nitrogen, which has high consumption of magnesium salts and phosphate salts, and introduces phosphorus pollution. The stripping method adds a large amount of caustic soda flakes to the solution, then circulates and sprays it in the stripping tower, and then uses a high-power fan to spray a large amount of air to remove the ammonia nitrogen in the form of ammonia gas. This process is suitable for wastewater with high concentrations of ammonia nitrogen, but the overall operation time is long, the consumption of sodium hydroxide is large, the energy consumption is high, and it is difficult to remove the ammonia nitrogen to meet the standards in one go; the distillation method adjusts the pH value of the solution in advance, and then uses a distillation tower to remove the ammonia nitrogen, but how to accurately adjust the pH value, accurately control the temperature of the distillation tower, and how to achieve efficient preheating are the keys to achieving low-carbon, high-efficiency, and green operation.

[0004] Based on the above situation, a green and energy-saving treatment device for tungsten smelting solution containing tungsten, molybdenum and ammonia nitrogen was developed. Through a two-stage adsorption system, low-concentration tungsten and molybdenum were extracted. The solution was automatically fed back to the calcium hydroxide oxidation system to achieve low alkali consumption, low-cost precise pH adjustment and efficient sedimentation and solid removal, and calcium slag removal. Relying on the efficient and energy-saving preheating system, the waste heat was utilized, and the steam consumption was greatly reduced. With the help of steam direct heating and automatic control tower top cold spray system, the deep removal of ammonia nitrogen was completed, and high-quality ammonia water was prepared. A water-condensed ammonia and air-cooled circulating water system was set up to complete the conversion of ammonia gas into ammonia water. The steam automatic feedback adjustment system was implemented to achieve precise control of the temperature distribution of the distillation tower. Finally, through the new design, the efficient extraction of low-concentration tungsten and molybdenum was achieved, and the deep removal and resource utilization of free ammonia in the solution were completed, with significant energy-saving and green emission reduction benefits. Therefore, the problems of diverse equipment and complex processes mentioned above need to be solved urgently to improve the application scenarios of existing treatment devices. Utility Model Content

[0005] In view of the difficulty and high cost of deep treatment of tungsten, molybdenum and ammonia nitrogen solution in China Tungsten Smelting, and the failure to achieve green resource utilization, the embodiment of the present application provides such a green energy-saving treatment device for tungsten, molybdenum and ammonia nitrogen solution in tungsten smelting, including a two-stage adsorption system, an automatic feedback calcium hydroxide addition system, a high-efficiency energy-saving preheating system, a steam direct heating and automatic control tower top cold spray system, a water-condensed ammonia and air-cooled circulating water system, wherein:

[0006] The two-stage adsorption system is used to extract low-concentration tungsten and molybdenum. It is equipped with a low-concentration tungsten, molybdenum, and free ammonia solution storage tank. The storage tank is made of PPH and has a volume of 100m 3 , used for storing low-concentration tungsten, molybdenum and free ammonia solution, a centrifugal pump (anti-corrosion type, power 2.2KW·h), used for pumping the solution to be treated to the next link, the first adsorption tower (3), the second adsorption tower (4), the third adsorption tower (5), and the fourth adsorption tower (6) are all adsorption towers (the inner lining of the tower is plastic, the outer lining of the tower is carbon steel, and the size is φ800mm×8000mm), the first adsorption tower (3), the second adsorption tower (4), the third adsorption tower (5), and the fourth adsorption tower (6) are divided into two groups, wherein the first adsorption tower (3) and the second adsorption tower (4) are connected in series, and the third adsorption tower (5) and the fourth adsorption tower (6) are connected in series, and the tower is filled with 201×7 ion exchange resin, and the resin filling amount is 80-90% of the tower volume, which is used for preferentially adsorbing low-concentration tungsten and molybdenum in the solution, and the liquid after adsorption is transported to the next link through the second centrifugal pump.

[0007] The automatic feedback calcium hydroxide addition system is used to automatically and accurately adjust the pH value of the pumped solution, and automatically deposit and filter the solid phase (slag) generated in the pH adjustment process. The filtrate returns to the treatment system again. A sedimentation tank (horizontal tank, made of carbon steel, with a size of φ600mm×5000mm) is provided, which has a rotary vane baffle. After the solution is adjusted to pH by calcium hydroxide, it passes through the rotary vane baffle to deposit the generated solid phase to the bottom of the tank. The pH probe measures the pH value data of the solid-removing solution deposited in the sedimentation tank and communicates with the pH controller The slurry pump is connected to the calcium hydroxide storage tank and fed back to the calcium hydroxide slurry pump, which is a slurry pump (anti-corrosion type, power 2.2KW·h). It is connected to the calcium hydroxide storage tank and started after receiving the feedback information from the pH value controller. It accurately pumps calcium hydroxide into the precipitation tank by itself to adjust the pH value of the solution. It is a slag liquid collection tank (volume 10m3, PPH material), which mainly collects the slag liquid obtained by the precipitation tank after the rotary vane baffle is desolidified, and is pumped into the plate and frame filter press (anti-corrosion plate filter press, filtration area 100m3) through the third centrifugal pump (anti-corrosion type, 5.5KW·h). 2 ) to achieve the separation of slag and liquid, and the filtrate is stored in the filtrate storage tank (volume 10m 3 , PPH material), and when a certain amount is collected, it is combined with the solution from the sedimentation tank through the fourth centrifugal pump (anti-corrosion type, 2.2KW·h) and pumped into the next link.

[0008] The high-efficiency and energy-saving preheating system is used to efficiently exchange heat between the solution treated by the automatic feedback calcium hydroxide addition system and the bottom liquid of the distillation tower, significantly increasing the temperature, thereby greatly reducing the consumption of steam. At the same time, the design system is used to realize two sets of parallel secondary heat exchange to ensure stable operation. There are four plate heat exchangers, namely the first heat exchanger, the second heat exchanger, the third heat exchanger and the fourth heat exchanger. The heat exchanger fins are made of titanium, the number of heat exchanger fins is 140, and the heat exchange area of ​​a single heat exchanger is 19.6m 2 , the maximum water flow is 20m 3 / h, the connecting pipe is made of 304 stainless steel with a diameter of φ65mm, of which the first heat exchanger and the second heat exchanger are a group, and the third heat exchanger and the fourth heat exchanger are a group. The solution treated by the automatic feedback calcium hydroxide system moves in countercurrent with the bottom liquid of the distillation tower. Through the two sets of parallel heat exchangers, the efficient preheating of the solution treated by the automatic feedback calcium hydroxide system is achieved, and the temperature of the bottom liquid of the distillation tower is reduced. The preheated solution is pumped into the next treatment link by the fifth centrifugal pump (anti-corrosion, power 5.5KW·h, head 35m).

[0009] The steam direct heating and automatic tower top cold spray system is used to distill and remove free ammonia in the preheated solution to achieve the treatment and resource utilization of ammonia nitrogen. It is equipped with an automatic tower top cold spray system to improve the quality of prepared ammonia water (improve concentration and purity). A main equipment distillation tower is provided. According to the calculation of deamination flow and deamination effect, the tower height of the distillation tower is set to 26m, the tower diameter is φ100cm, the tower body is made of 304 carbon steel, the tower is lined with a titanium anti-corrosion layer, the tower plate is made of 316L stainless steel, the filler is 316L serpentine sheet, the tower top ammonia delivery pipe is a seamless 10# steel pipe with a diameter of φ100mm, the tower inlet steam pipe is a seamless 10# steel pipe with a diameter of φ65mm, the tower top cold spray pipeline is a 304 stainless steel pipe with a diameter of φ25mm, and the volume of the cold tap water tank is 5m 3 PPH tank, automatic centrifugal pump, high-lift centrifugal pump, power 2.2kw, head 28m, flow 3m 3 / h, the diameter of the water inlet pipe end is φ20mm, the diameter of the water outlet pipe end is φ15mm, the rotation speed is 2900r / min, and the steam is directly transported to the distillation tower through the pipeline. The hot gas runs from the bottom to the top, and the solution preheated in the previous step is sprayed from the top of the tower and runs from the top of the tower to the bottom. Through intense heat exchange, free ammonia is separated from the solution in the form of ammonia gas, and is transmitted to the next link from the ammonia gas delivery pipeline at the top of the tower. The automatic control tower top cold spray system is linked to the tower top temperature. If the tower top temperature is too high, flooding and a large amount of water vapor evaporation are likely to occur. At this time, the cold spray pump is started to spray cold tap water to suppress flooding, reduce water vapor generation, and improve the concentration and purity of ammonia water. The ammonia formed in the distillation tower is transported to the next process through a pipeline.

[0010] The water-condensed ammonia and air-cooled circulating water system is used to condense the ammonia-containing gas transported from the top of the distillation tower to prepare high-concentration ammonia water. It is equipped with a water-cooled heat exchanger made of titanium and has a heat exchange area of ​​120m 2 , ammonia storage tank, PPH material, volume 10m 3 , connected to an anti-corrosion centrifugal pump, power 2.2kw, head 28m, flow 3m 3 / h, the diameter of the water inlet pipe is φ20mm, the diameter of the water outlet pipe is φ15mm, and the speed is 2900r / min. It is used to transport the condensed ammonia water to the utilization process and return it to the use link. The air-cooled circulating water system is powered by an anti-corrosion centrifugal pump (power 15.0KW, flow rate 180m 3 / h, speed 1450r / min, water inlet diameter φ150mm, water outlet diameter φ180mm) pumps the cooled tap water into the water-cooled heat exchanger, and the tap water with increased temperature after heat exchange is transported to the air-cooled circulating water device through stainless steel pipes (the air-cooled cooling tower has the dimensions of 4m high × 3m wide × 3.5m long, the fan power is 11KW, the packing layer is 2m, the packing layer is made of plastic mesh, the circulating pipe is stainless steel, and the diameter is φ180mm) to realize the circulation of the water cooling system. In this process, the cooling water will have some evaporation loss, so an automatic water replenishment device is provided, and the tap water inlet pipe is associated with the float valve of the water collection tank at the bottom of the tower in the air-cooled circulating water device, thereby automatically controlling the liquid level to realize automatic cold water replenishment.

[0011] The steam automatic feedback regulation system is used to control the temperature of the bottom, middle and top of the tower during the distillation process to ensure the deamination effect while taking into account energy saving and consumption reduction. It is equipped with a steam automatic drain valve to ensure smooth steam transportation and timely discharge of condensed water from the steam in the transportation pipeline. The steam automatic control valve is linked with the temperature probe (3 groups in total, namely the bottom, middle and top of the distillation tower). By setting the temperature of the top, middle and bottom of the tower, the temperature probe measures the real-time temperature, and converts the temperature data into a control signal to control the opening degree of the steam automatic control valve, thereby realizing precise control of steam transportation and achieving energy saving. The steam pressure reducing valve ensures the stability of the transportation steam pressure, thereby further improving the accuracy of the steam automatic control valve regulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Shown is a schematic diagram of the structure of a green and energy-saving treatment device for tungsten smelting solution containing tungsten, molybdenum and ammonia nitrogen according to the utility model.

[0013] Description of reference numerals: 1. low concentration tungsten, molybdenum, free ammonia solution storage tank; 2. first centrifugal pump; 3. first adsorption tower; 4. second adsorption tower; 5. third adsorption tower; 6. fourth adsorption tower; 7. second centrifugal pump; 8. sedimentation tank; 9. pH probe; 10. slurry pump; 11. calcium hydroxide storage tank; 12. slag liquid collection tank; 13. third centrifugal pump; 14. plate and frame filter press; 15. filtrate storage tank; 16. fourth centrifugal pump; 17. The first heat exchanger; 18. The second heat exchanger; 19. The third heat exchanger; 20. The fourth heat exchanger; 21. The fifth centrifugal pump; 22. The distillation tower; 23. The steam trap; 24. The automatic steam control valve; 25. The steam pressure reducing valve; 26. The temperature probe; 27. The water-cooled heat exchanger; 28. The ammonia storage tank; 29. ​​The anti-corrosion centrifugal pump; 30. The air-cooled circulating water device; 31. The automatic water replenishment device; 32. The cold tap water tank; 33. The automatic centrifugal pump. DETAILED DESCRIPTION

[0014] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0015] Example 1

[0016] The tungsten smelting solution containing tungsten, molybdenum and ammonia nitrogen is a four-stage liquid obtained from the strong alkaline anion exchange desorption process, containing WO33.16g / L, Mo 0.04g / L, and NH3-N 7567.24ppm.

[0017] (1) Two-stage adsorption, with tungsten smelting containing tungsten, molybdenum, and ammonia nitrogen solution in PPH material, volume 100m 3 The low concentration tungsten, molybdenum and free ammonia solution storage tank 1 is pumped to the first adsorption tower (3), the second adsorption tower (4), the third adsorption tower (5) and the fourth adsorption tower (6) for adsorption (the tower is lined with plastic and the outside is made of carbon steel, with a size of φ800mm×8000mm, and the tower is filled with 201×7 ion exchange resin, and the resin filling amount is 85% of the tower volume). The adsorption flow rate is controlled to 6m 3 / h, the detection results of the liquid after adsorption are WO3 0.002g / L, Mo≤0.001g / L, NH3-N7531.49ppm (ammonia nitrogen concentration only fluctuates slightly), and the liquid after adsorption is transported to the next link through the second centrifugal pump 7 (anti-corrosion type, power 2.2KW·h).

[0018] (2) Automatic feedback of calcium hydroxide is used to automatically and accurately adjust the pH value of the pumped solution, and the solid phase (slag) generated during the pH adjustment process is automatically deposited and filtered, and the filtrate is returned to the treatment system again. After the adsorption in the previous step, the second centrifugal pump 7 is input into the sedimentation tank 8 (horizontal tank, made of carbon steel, with a size of φ600mm×5000mm). After the solution is adjusted to pH by calcium hydroxide, it passes through the rotary vane baffle and the generated solid phase is deposited to the bottom of the tank and enters the slag liquid collection tank 12 (volume 10m 3 , PPH material). There are three groups of pH probes 9, which are arranged at the front, middle and tail of the tank body respectively to ensure that the data obtained are true and reliable. The pH value data of the solid removal solution deposited in the sedimentation tank 8 is measured, and connected to the pH controller, and fed back to the calcium hydroxide slurry pump 10 (anti-corrosion type, power 2.2KW·h). The slurry pump 10 is connected to the calcium hydroxide storage tank 11. After obtaining the feedback information from the pH value controller, if the pH value of the solution in the sedimentation tank 8 is ≤13.0, the slurry pump 10 will start immediately. If the pH value of the solution in the sedimentation tank 8 is ≥14.0, the operation is equivalent to treating every cubic meter of ammonia nitrogen wastewater, and the calcium hydroxide consumption is 4.6-6.4kg. The solution with calcium hydroxide added to adjust the pH value passes through the slag liquid collection tank 12 (volume 10m 3, PPH material), mainly collects the slag liquid obtained by the precipitation tank 8 after the rotary vane baffle desolidification, then the slurry pump 10 stops immediately, accurately controls the process of calcium hydroxide pumping into the precipitation tank 8, and adjusts the pH value of the solution. The sediment in the slag liquid collection tank 12 is pumped into the plate and frame filter press 14 (anti-corrosion plate filter press, filtration area 100m) by the third centrifugal pump 13 (anti-corrosion type, 5.5KW·h) 2 ) to achieve separation of slag and liquid, and the filtrate enters the filtrate storage tank 15 (volume 10m 3 , PPH material), and a certain amount is collected and combined with the solution from the sedimentation tank 8 through the fourth centrifugal pump 16 (anti-corrosion type, 2.2KW·h), and pumped into the next link.

[0019] (3) High-efficiency and energy-saving preheating: the solution with adjusted pH value obtained in the previous step is efficiently heat exchanged with the bottom liquid of the distillation tower 22 to increase the temperature of the solution, thereby reducing the consumption of steam. There are two sets of parallel secondary heat exchangers, the first heat exchanger (17) and the second heat exchanger (18) and the third heat exchanger (19) and the fourth heat exchanger (20). The heat exchange equipment is a plate heat exchanger, the heat exchange plate is made of titanium, the number of heat exchange plates is 140, and the heat exchange area of ​​a single heat exchanger is 19.6m 2 , the maximum water flow is 20m 3 / h, the connecting pipe is made of 304 stainless steel with a diameter of φ65mm. The solution treated by the automatic feedback calcium hydroxide system moves in countercurrent with the bottom liquid of the distillation tower 22, and the solution treated by the automatic feedback calcium hydroxide system is efficiently preheated through two sets of parallel heat exchangers. After monitoring, the outlet water temperature of the bottom liquid of the distillation tower 22 is 100°C, and after heat exchange, the temperature is 65°C. The temperature of the solution treated by the calcium hydroxide system before entering the heat exchanger is 35°C, and after heat exchange, the temperature is 83°C. The preheated solution is pumped into the next treatment link by the fifth centrifugal pump 21 (corrosion-resistant, power 5.5KW·h, head 35m).

[0020] (4) Steam direct heating and automatic top cold spraying. The preheated solution obtained in the previous step is processed by the distillation tower 22 to achieve deep removal of ammonia nitrogen. The removed residual liquid flows out from the bottom of the distillation tower 22, and the formed ammonia gas rises to the top of the distillation tower 22. It is equipped with an automatic top cold spraying system to prevent the top temperature from being too high and the formation of flooding, thereby improving the quality (concentration and purity) of the prepared ammonia water. The main equipment distillation tower 22 is provided. The tower height of the distillation tower 22 is set to 26m, the tower diameter is φ100cm, the tower body is made of 304 carbon steel, the tower is lined with a titanium anti-corrosion layer, the tower plate is made of 316L stainless steel, the filler is 316L serpentine sheet, and the tower top ammonia delivery pipe is a seamless 10# steel pipe with a diameter of φ100mm. The steam pipe entering the tower is a seamless 10# steel pipe with a diameter of φ65mm, and the tower top cold spray pipeline is a 304 stainless steel pipe with a diameter of φ25mm. The cold tap water tank 32 is a PPH tank with a volume of 5m3, and uses an automatic centrifugal pump 33 (power 2.2kw, head 28m, flow rate 1-3m 3 / h, the diameter of the water inlet pipe end is φ20mm, the diameter of the water outlet pipe end is φ15mm, and the speed is 2900r / min), and cold tap water is sprayed into the distillation tower 22 from the top of the tower. Steam is directly transported to the distillation tower 22 through a pipeline, and the hot gas runs from the bottom to the top. The solution preheated in the previous step is sprayed from the top of the tower and runs from the top of the tower to the bottom. Through intense heat exchange, free ammonia is separated from the solution in the form of ammonia gas and is transmitted to the next link from the ammonia gas delivery pipeline at the top of the tower. The automatic control tower top cold spray system is linked with the tower top temperature. If the tower top temperature is too high (≥105℃), it is easy to cause flooding and a large amount of water vapor evaporation. At this time, the cold spray pump is started to spray cold tap water, thereby suppressing the flooding phenomenon, reducing the generation of water vapor, and improving the concentration and purity of the prepared ammonia water. Operation monitoring shows that the NH3-N concentration of the water at the bottom of the tower is 5-15ppm, and the ammonia formed in the distillation tower 22 is transported to the next process through a pipeline.

[0021] (5) Water-condensed ammonia and air-cooled circulating water: The ammonia gas formed in the distillation process in the previous step is transported to the water-condensed ammonia process through the tower top pipeline to be used to prepare high-concentration ammonia water. A water-cooled heat exchanger 27 is provided. The water-cooled heat exchanger 27 is made of titanium and has a heat exchange area of ​​120m 2 The bottom of the water-cooled heat exchanger 27 is connected to an ammonia water storage tank 28 (PPH material, volume 10m3), which is connected to an anti-corrosion centrifugal pump 29 (power 2.2kw, head 28m, flow 3m 3 / h, the diameter of the water inlet pipe end is φ20mm, the diameter of the water outlet pipe end is φ15mm, and the speed is 2900r / min), which is used to transport the condensed ammonia water to the utilization process and return it to the use link. The air-cooled circulating water system is powered by an anti-corrosion centrifugal pump 29 (power 15.0KW, flow rate 180m 3 / h, speed 1450r / min, water inlet diameter φ150mm, water outlet diameter φ180mm) pumps the cooled tap water to the water-cooled heat exchanger 27, and the tap water with increased temperature after heat exchange is transported to the air-cooled circulating water device 30 through a stainless steel pipe (the air-cooled cooling tower has a size of 4m high × 3m wide × 3.5m long, the fan power is 11KW, the packing layer is 2m, the packing layer is made of plastic mesh, the circulating pipe is stainless steel, and the diameter is φ180mm), so as to realize the circulation of the water cooling system (water cooling system, control the inlet water temperature at 30°C and the outlet water temperature at 40°C). In this process, the cooling water will have some evaporation loss, so an automatic water replenishment device 31 is provided, and the inlet tap water pipe is associated with the float valve of the water collection tank at the bottom of the tower in the air-cooled circulating water device 30, thereby automatically controlling the liquid level and realizing automatic cold water replenishment. The concentration of condensed ammonia water can be controlled to 80-255g / L by linking with the automatic tower top cold spray in step (4).

[0022] (6) Automatic steam feedback regulation is used to control the temperature at the bottom, middle and top of the tower during the distillation process to ensure the deammoniation effect while taking into account energy conservation and consumption reduction. An automatic steam drain valve 23 is provided to ensure smooth steam transportation and timely discharge of condensed water from the steam in the transportation pipeline. The steam automatic control valve 24 is linked with the temperature probe 26 (the temperature at the bottom of the distillation tower 22 is set to 102-105°C, 96-101°C in the tower, and 92-95°C at the top of the tower, a total of 3 groups). By setting the temperature at the top, middle and bottom of the tower, the temperature probe 26 measures the real-time temperature and converts the temperature data into a control signal to control the opening degree of the steam automatic control valve 24, thereby achieving precise control of steam transportation and achieving energy conservation. The steam pressure reducing valve 25 ensures the stability of the transportation steam pressure, thereby further improving the accuracy of the adjustment of the steam automatic control valve 24. 144m3 of steam is processed every day during operation 3 For wastewater containing ammonia, 8-10 tons of steam are required, and 55.55-69.44 kg of steam is required for each cubic meter of wastewater containing ammonia.

[0023] Example 2

[0024] The tungsten smelting solution containing tungsten, molybdenum and ammonia nitrogen is the wash water of ammonium tungstate evaporation crystallization APT, containing WO3 1.05g / L, Mo≤0.001g / L, NH3-N 5371.85ppm.

[0025] (1) Two-stage adsorption, with tungsten smelting containing tungsten, molybdenum, and ammonia nitrogen solution in PPH material, volume 100m 3 The low-concentration tungsten, molybdenum and free ammonia solution storage tank 1 is pumped to the adsorption tower for adsorption through the first centrifugal pump 2 (anti-corrosion type, power 2.2KW·h) (the tower is lined with plastic and the outside is carbon steel, with a size of φ800mm×8000mm. The tower is filled with 201×7 ion exchange resin, and the resin filling amount is 85% of the tower volume). The adsorption flow rate is controlled to 3m3 / h, the detection results of the liquid after adsorption are WO3 0.002g / L, Mo≤0.001g / L, NH3-N 5247.19ppm (ammonia nitrogen concentration only fluctuates slightly), and the liquid after adsorption is transported to the next link through the second centrifugal pump 7 (anti-corrosion type, power 2.2KW·h).

[0026] (2) Automatic feedback of calcium hydroxide is used to automatically and accurately adjust the pH value of the pumped solution, and the solid phase (slag) generated in the process of adjusting the pH value is automatically deposited and filtered, and the filtrate is returned to the treatment system again. After the adsorption in the previous step, the solution is input into the sedimentation tank 8 (horizontal tank, made of carbon steel, with a size of φ600mm×5000mm) through the first centrifugal pump 2. After the solution is adjusted to pH value by calcium hydroxide, it passes through the rotary vane baffle and the generated solid phase is deposited to the bottom of the tank and enters the slag liquid collection tank 12 (volume 10m 3 , PPH material). There are three groups of pH probes 9, which are arranged at the front, middle and tail of the tank body respectively to ensure that the data obtained are true and reliable. The pH value data of the solid removal solution deposited in the sedimentation tank 8 is measured, and connected to the pH controller, and fed back to the calcium hydroxide slurry pump 10 (anti-corrosion type, power 2.2KW·h). The slurry pump 10 is connected to the calcium hydroxide storage tank 11. After obtaining the feedback information from the pH value controller, if the pH value of the solution in the sedimentation tank 8 is ≥12.7, the slurry pump 10 will start immediately. If the pH value of the solution in the sedimentation tank 8 is ≤13.7, the operation is equivalent to treating every cubic meter of ammonia nitrogen wastewater, and the calcium hydroxide consumption is 5.2-6.8kg. The solution with calcium hydroxide added to adjust the pH value passes through the slag liquid collection tank 12 (volume 10m 3 , PPH material), mainly collects the slag liquid obtained by the precipitation tank 8 after the rotary vane baffle desolidification, then the slurry pump 10 stops immediately, accurately controls the process of calcium hydroxide pumping into the precipitation tank 8, and adjusts the pH value of the solution. The sediment in the slag liquid collection tank 12 is pumped into the plate and frame filter press 14 (anti-corrosion plate filter press, filtration area 100m) by the third centrifugal pump 13 (anti-corrosion type, 5.5KW·h) 2 ) to achieve separation of slag and liquid, and the filtrate enters the filtrate storage tank 15 (volume 10m 3 , PPH material), and a certain amount is collected and combined with the solution from the sedimentation tank 8 through the fourth centrifugal pump 16 (anti-corrosion type, 2.2KW·h), and pumped into the next link.

[0027] (3) High-efficiency and energy-saving preheating: The solution with adjusted pH value obtained in the previous step is efficiently heat exchanged with the bottom liquid of distillation tower 22 to increase the temperature of the solution, thereby reducing steam consumption. There are two sets of parallel secondary heat exchangers. The heat exchange equipment is a plate heat exchanger. The heat exchange plate is made of titanium. The number of heat exchange plates is 140. The heat exchange area of ​​a single heat exchanger is 19.6m 2 , the maximum water flow is 20m3 / h, the connecting pipe is made of 304 stainless steel with a diameter of φ65mm. The solution treated by the automatic feedback calcium hydroxide system moves in countercurrent with the bottom liquid of the distillation tower 22, and the solution treated by the automatic feedback calcium hydroxide system is efficiently preheated through two sets of parallel heat exchangers. After monitoring, the outlet water temperature of the bottom liquid of the distillation tower 22 is 100°C, and after heat exchange, the temperature is 65°C. The temperature of the solution treated by the calcium hydroxide system before entering the heat exchanger is 35°C, and after heat exchange, the temperature is 88°C. The preheated solution is pumped into the next treatment link by the fifth centrifugal pump 21 (corrosion-resistant, power 5.5KW·h, head 35m).

[0028] (4) Steam direct heating and automatic top cold spraying. The preheated solution obtained in the previous step is processed by the distillation tower 22 to achieve deep removal of ammonia nitrogen. The removed residual liquid flows out from the bottom of the distillation tower 22, and the formed ammonia gas rises to the top of the distillation tower 22. It is equipped with an automatic top cold spraying system to prevent the top temperature from being too high and the formation of flooding, thereby improving the quality (concentration and purity) of the prepared ammonia water. The main equipment distillation tower 22 is provided. The tower height of the distillation tower 22 is set to 26m, the tower diameter is φ100cm, the tower body is made of 304 carbon steel, the tower is lined with a titanium anti-corrosion layer, the tower plate is made of 316L stainless steel, the filler is 316L serpentine sheet, and the tower top ammonia delivery pipe is a seamless 10# steel pipe with a diameter of φ100mm. The steam pipe entering the tower is a seamless 10# steel pipe with a diameter of φ65mm, and the tower top cold spray pipeline is a 304 stainless steel pipe with a diameter of φ25mm. The cold tap water tank 32 is a PPH tank with a volume of 5m3, and uses an automatic centrifugal pump 33 (power 2.2kw, head 28m, flow rate 1-3m 3 / h, the diameter of the water inlet pipe end is φ20mm, the diameter of the water outlet pipe end is φ15mm, and the speed is 2900r / min), and cold tap water is sprayed from the top of the tower into the distillation tower 22. Steam is directly transported to the distillation tower 22 through a pipeline, and the hot gas runs from the bottom to the top. The solution preheated in the previous step is sprayed from the top of the tower and runs from the top of the tower to the bottom. Through intense heat exchange, free ammonia is separated from the solution in the form of ammonia gas and is transmitted to the next link from the ammonia gas delivery pipeline at the top of the tower. The automatic control tower top cold spray system is linked with the tower top temperature. If the tower top temperature is too high (≥106℃), it is easy to cause flooding and a large amount of water vapor evaporation. At this time, the cold spray pump is started to spray cold tap water, thereby suppressing the flooding phenomenon, reducing the generation of water vapor, and improving the concentration and purity of the prepared ammonia water. Operation monitoring shows that the NH3-N concentration of the water at the bottom of the tower is 3-14ppm, and the ammonia formed in the distillation tower 22 is transported to the next process through a pipeline.

[0029] (5) Water-condensed ammonia and air-cooled circulating water. The ammonia gas formed in the distillation process in the previous step is transported to the water-condensed ammonia process through the tower top pipeline to prepare high-concentration ammonia water. A water-cooled heat exchanger 27 is provided. The water-cooled heat exchanger 27 is made of titanium and has a heat exchange area of ​​120m 2 The bottom of the heat exchanger is connected to an ammonia water storage tank 28 (PPH material, volume 10m 3 ), connected to the anti-corrosion centrifugal pump 29 (power 2.2kw, head 28m, flow 3m 3 / h, the diameter of the water inlet pipe end is φ20mm, the diameter of the water outlet pipe end is φ15mm, and the speed is 2900r / min), which is used to transport the condensed ammonia water to the utilization process and return it to the use link. The air-cooled circulating water system is powered by an anti-corrosion centrifugal pump 29 (power 15.0KW, flow rate 180m 3 / h, speed 1450r / min, water inlet diameter φ150mm, water outlet diameter φ180mm) pumps the cooled tap water to the water-cooled heat exchanger 27, and the tap water with increased temperature after heat exchange is transported to the air-cooled circulating water device 30 through a stainless steel pipe (the air-cooled cooling tower has a size of 4m high × 3m wide × 3.5m long, the fan power is 11KW, the packing layer is 2m, the packing layer is made of plastic mesh, the circulating pipe is stainless steel, and the diameter is φ180mm), so as to realize the circulation of the water cooling system (water cooling system, control the inlet water temperature at 30°C and the outlet water temperature at 38°C). In this process, the cooling water will have some evaporation loss, so an automatic water replenishment device 31 is provided, and the inlet tap water pipe is associated with the float valve of the water collection tank at the bottom of the tower in the air-cooled circulating water device 30, thereby automatically controlling the liquid level and realizing automatic cold water replenishment. The concentration of the condensed ammonia water can be controlled to 100-200g / L by linking with the automatic tower top cold spray in step (4).

[0030] (6) Automatic steam feedback regulation is used to control the temperature at the bottom, middle and top of the tower during the distillation process to ensure the deammoniation effect while taking into account energy conservation and consumption reduction. An automatic steam drain valve 23 is provided to ensure smooth steam transportation and timely discharge of condensed water from the steam in the transportation pipeline. The steam automatic control valve 24 is linked with the temperature probe 26 (the temperature at the bottom of the distillation tower 22 is set to 103-105°C, 96-101°C in the tower, and 92-95°C at the top of the tower, a total of 3 groups). By setting the temperature at the top, middle and bottom of the tower, the temperature probe 26 measures the real-time temperature and converts the temperature data into a control signal to control the opening degree of the steam automatic control valve 24, thereby achieving precise control of steam transportation and achieving energy conservation. The steam pressure reducing valve 25 ensures the stability of the transportation steam pressure, thereby further improving the accuracy of the adjustment of the steam automatic control valve 24. The operation process is 72m per day 3 For wastewater containing ammonia, 3.8-4.8 tons of steam are required, and 52.77-66.66 kg are required for each cubic meter of wastewater containing ammonia.

[0031] Example 3

[0032] The tungsten smelting solution containing tungsten, molybdenum and ammonia nitrogen is the condensed water of evaporation and crystallization of ammonium tungstate, containing WO3 0.54g / L, Mo≤0.001g / L, and NH3-N 28914.56ppm.

[0033] (1) Two-stage adsorption, with tungsten smelting containing tungsten, molybdenum, and ammonia nitrogen solution in PPH material, volume 100m 3 The low-concentration tungsten, molybdenum and free ammonia solution storage tank 1 is pumped to the adsorption tower for adsorption through the first centrifugal pump 2 (anti-corrosion type, power 2.2KW·h) (the tower is lined with plastic and the outside is carbon steel, with a size of φ800mm×8000mm. The tower is filled with 201×7 ion exchange resin, and the resin filling amount is 85% of the tower volume). The adsorption flow rate is controlled to 2m 3 / h, the detection results of the liquid after adsorption are WO3 0.002g / L, Mo≤0.001g / L, NH3-N 28735.26ppm (ammonia nitrogen concentration only fluctuates slightly), and the liquid after adsorption is transported to the next link through the second centrifugal pump 7 (anti-corrosion type, power 2.2KW·h).

[0034] (2) Automatic feedback of calcium hydroxide is used to automatically and accurately adjust the pH value of the pumped solution, and the solid phase (slag) generated during the pH adjustment process is automatically deposited and filtered, and the filtrate is returned to the treatment system again. After the adsorption in the previous step, the second centrifugal pump 7 is input into the sedimentation tank 8 (horizontal tank, made of carbon steel, with a size of φ600mm×5000mm). After the solution is adjusted to pH by calcium hydroxide, it passes through the rotary vane baffle and the generated solid phase is deposited to the bottom of the tank and enters the slag liquid collection tank 12 (volume 10m 3 , PPH material). There are three groups of pH probes 9, which are arranged at the front, middle and tail of the tank body respectively to ensure that the data obtained are true and reliable. The pH value data of the solid removal solution deposited in the sedimentation tank 8 is measured, and connected to the pH controller, and fed back to the calcium hydroxide slurry pump 10 (anti-corrosion type, power 2.2KW·h). The slurry pump 10 is connected to the calcium hydroxide storage tank 11. After obtaining the feedback information from the pH value controller, if the pH value of the solution in the sedimentation tank 8 is ≥13, the slurry pump 10 will start immediately. If the pH value of the solution in the sedimentation tank 8 is ≤14, the operation is equivalent to treating every cubic meter of ammonia nitrogen wastewater, and the calcium hydroxide consumption is 4.6-6.5kg. The solution with calcium hydroxide added to adjust the pH value passes through the slag liquid collection tank 12 (volume 10m 3, PPH material), mainly collects the slag liquid obtained by the precipitation tank 8 after the rotary vane baffle desolidification, then the slurry pump 10 stops immediately, accurately controls the process of calcium hydroxide pumping into the precipitation tank 8, and adjusts the pH value of the solution. The sediment in the slag liquid collection tank 12 is pumped into the plate and frame filter press 14 (anti-corrosion plate filter press, filtration area 100m) by the third centrifugal pump 13 (anti-corrosion type, 5.5KW·h) 2 ) to achieve separation of slag and liquid, the filtrate enters the filtrate storage tank 15 (volume 10m3, PPH material) for storage, and a certain amount is collected and combined with the solution from the sedimentation tank 8 through the fourth centrifugal pump 16 (anti-corrosion type, 2.2KW·h) and pumped into the next link.

[0035] (3) High-efficiency and energy-saving preheating: The solution with adjusted pH value obtained in the previous step is efficiently heat exchanged with the bottom liquid of distillation tower 22 to increase the temperature of the solution, thereby reducing steam consumption. There are two sets of parallel secondary heat exchangers. The heat exchange equipment is a plate heat exchanger. The heat exchange plate is made of titanium. The number of heat exchange plates is 140. The heat exchange area of ​​a single heat exchanger is 19.6m 2 , the maximum water flow is 20m 3 / h, the connecting pipe is made of 304 stainless steel with a diameter of φ65mm. The solution treated by the automatic feedback calcium hydroxide system moves in countercurrent with the bottom liquid of the distillation tower 22, and the solution treated by the automatic feedback calcium hydroxide system is efficiently preheated through two sets of parallel heat exchangers. After monitoring, the outlet water temperature of the bottom liquid of the distillation tower 22 is 100°C, and after heat exchange, the temperature is 69°C. The temperature of the solution treated by the calcium hydroxide system before entering the heat exchanger is 35°C, and after heat exchange, the temperature is 86°C. The preheated solution is pumped into the next treatment link by the fifth centrifugal pump 21 (anti-corrosion, power 5.5KW·h, head 35m).

[0036] (4) Steam direct heating and automatic control of the top cold spray. The preheated solution obtained in the previous step is processed by the distillation tower 22 to achieve deep removal of ammonia nitrogen. The residual liquid after removal flows out from the bottom of the distillation tower 22, and the formed ammonia rises to the top of the distillation tower 22. It is equipped with an automatic control top cold spray system to prevent the top temperature from being too high and the formation of flooding, thereby improving the quality (concentration and purity) of the prepared ammonia water. The main equipment distillation tower 22 is set to a height of 26m and a tower diameter of φ100cm. The tower body is made of 304 carbon steel, the tower is lined with a titanium anti-corrosion layer, the tower plate is made of 316L stainless steel, the filler is 316L serpentine sheet, and the top ammonia delivery pipe is a seamless 10# steel pipe with a diameter of φ100mm. The steam inlet pipe is a seamless 10# steel pipe with a diameter of φ65mm, and the top cold spray pipe is a 304 stainless steel pipe with a diameter of φ25mm. The volume of the cold tap water tank 32 is 5m 3 The PPH tank is equipped with an automatic centrifugal pump 33 (power 2.2kw, head 28m, flow rate 1-3m3 / h, the diameter of the water inlet pipe end is φ20mm, the diameter of the water outlet pipe end is φ15mm, and the speed is 2900r / min), and cold tap water is sprayed from the top of the tower into the distillation tower 22. Steam is directly transported to the distillation tower 22 through a pipeline, and the hot gas runs from the bottom to the top. The solution preheated in the previous step is sprayed from the top of the tower and runs from the top of the tower to the bottom. Through intense heat exchange, free ammonia is separated from the solution in the form of ammonia gas and is transmitted to the next link from the ammonia gas delivery pipeline at the top of the tower. The automatic control tower top cold spray system is linked with the tower top temperature. If the tower top temperature is too high (≥106℃), it is easy to cause flooding and a large amount of water vapor evaporation. At this time, the cold spray pump is started to spray cold tap water, thereby suppressing the flooding phenomenon, reducing the generation of water vapor, and improving the concentration and purity of the prepared ammonia water. Operation monitoring shows that the NH3-N concentration of the water at the bottom of the tower is 2-8ppm, and the ammonia formed in the distillation tower 22 is transported to the next process through a pipeline.

[0037] (5) Water-condensed ammonia and air-cooled circulating water. The ammonia gas formed in the distillation process in the previous step is transported to the water-condensed ammonia process through the tower top pipeline to prepare high-concentration ammonia water. A water-cooled heat exchanger 27 is provided. The water-cooled heat exchanger 27 is made of titanium and has a heat exchange area of ​​120m 2 The bottom of the heat exchanger is connected to an ammonia water storage tank 28 (PPH material, volume 10m 3 ), connected to the anti-corrosion centrifugal pump 29 (power 2.2kw, head 28m, flow 3m 3 / h, the diameter of the water inlet pipe end is φ20mm, the diameter of the water outlet pipe end is φ15mm, and the speed is 2900r / min), which is used to transport the condensed ammonia water to the utilization process and return it to the use link. The air-cooled circulating water system is powered by an anti-corrosion centrifugal pump 29 (power 15.0KW, flow rate 180m 3 / h, speed 1450r / min, water inlet diameter φ150mm, water outlet diameter φ180mm) pumps the cooled tap water to the water-cooled heat exchanger 27, and the tap water with increased temperature after heat exchange is transported to the air-cooled circulating water device 30 through a stainless steel pipe (the air-cooled cooling tower has a size of 4m high × 3m wide × 3.5m long, the fan power is 11KW, the packing layer is 2m, the packing layer is made of plastic mesh, the circulating pipe is stainless steel, and the diameter is φ180mm), so as to realize the circulation of the water cooling system (water cooling system, control the inlet water temperature at 30°C and the outlet water temperature at 36°C). In this process, the cooling water will have some evaporation loss, so an automatic water replenishment device 31 is provided, and the inlet tap water pipe is associated with the float valve of the water collection tank at the bottom of the tower in the air-cooled circulating water device 30, thereby automatically controlling the liquid level and realizing automatic cold water replenishment. The concentration of condensed ammonia water can be controlled to 120-270g / L by linking with the automatic tower top cold spray in step (4).

[0038] (6) Automatic steam feedback regulation is used to control the temperature at the bottom, middle and top of the tower during the distillation process to ensure the deammoniation effect while taking into account energy conservation and consumption reduction. An automatic steam drain valve 23 is provided to ensure smooth steam transportation and timely discharge of condensed water from the steam in the transportation pipeline. The steam automatic control valve 24 is linked with the temperature probe 26 (the temperature at the bottom of the distillation tower 22 is set to 101-103°C, 96-100°C in the tower, and 92-93°C at the top of the tower, a total of 3 groups). By setting the temperature at the top, middle and bottom of the tower, the temperature probe 26 measures the real-time temperature and converts the temperature data into a control signal to control the opening degree of the steam automatic control valve 24, thereby achieving precise control of steam transportation and achieving energy conservation. The steam pressure reducing valve 25 ensures the stability of the transportation steam pressure, thereby further improving the accuracy of the adjustment of the steam automatic control valve 24. The operation process is 48m 3 For wastewater containing ammonia, 2.4-2.8 tons of steam are required, and 50.0-58.33 kg are required for each cubic meter of wastewater containing ammonia.

Claims

1. A green and energy-saving treatment device for tungsten smelting containing tungsten, molybdenum, and ammonia nitrogen solution, including a two-stage adsorption system, an automatic feedback calcium hydroxide addition system, a high-efficiency energy-saving preheating system, a steam direct heating and automatic tower top cold spray system, a water-condensed ammonia and an air-cooled circulating water system. The two-stage adsorption system is used to complete the extraction of low-concentration tungsten and molybdenum, and is characterized by: The invention comprises a low-concentration tungsten, molybdenum and free ammonia solution storage tank (1) for storing low-concentration tungsten, molybdenum and free ammonia solution; a first centrifugal pump (2) for pumping the solution to be treated to the next link; a first adsorption tower (3), a second adsorption tower (4), a third adsorption tower (5) and a fourth adsorption tower (6) are divided into two groups, and the adsorption towers in each group are connected in series. The towers are filled with 201×7 ion exchange resin, and the resin filling amount is 80-90% of the tower volume, which is used for preferentially adsorbing low-concentration tungsten and molybdenum in the solution. After adsorption, the liquid is transported to the next link through the second centrifugal pump (7).

2. A green and energy-saving treatment device for tungsten smelting solution containing tungsten, molybdenum and ammonia nitrogen according to claim 1, characterized in that: The automatic feedback calcium hydroxide addition system is used to automatically and accurately adjust the pH value of the pumped solution, and automatically deposit and filter the solid phase slag generated in the pH adjustment process. The filtrate returns to the treatment system again. A sedimentation tank (8) is provided with a rotary vane baffle. After the solution is adjusted to pH by calcium hydroxide, it passes through the rotary vane baffle and the generated solid phase is deposited to the bottom of the tank. The pH value data of the solution deposited and desolidified in the sedimentation tank (8) is measured by a pH probe (9), and is connected to a pH controller and fed back to a calcium hydroxide slurry pump (10). The slurry pump (10) is connected to a calcium hydroxide storage tank (11). The slag liquid collection tank (12) collects the slag liquid obtained by desolidification through the rotary vane baffle and is pumped into a plate and frame filter press (14) through a third centrifugal pump (13). The filtrate is stored in a filtrate storage tank (15). After a certain amount of filtrate is collected, it is combined with the solution out of the sedimentation tank (8) through a fourth centrifugal pump (16) and pumped into the next link.

3. A green and energy-saving treatment device for tungsten smelting solution containing tungsten, molybdenum and ammonia nitrogen according to claim 1, characterized in that: The high-efficiency energy-saving preheating system is used to efficiently exchange heat between the solution treated by the automatic feedback calcium hydroxide addition system and the bottom liquid of the distillation tower (22), significantly raising the temperature, thereby greatly reducing steam consumption. At the same time, the design system is used to realize two sets of parallel secondary heat exchange to ensure stable operation. Four plate heat exchangers are provided, namely a first heat exchanger (17), a second heat exchanger (18), a third heat exchanger (19) and a fourth heat exchanger (20). The heat exchanger fins are made of titanium, the number of heat exchanger fins is 140, and the heat exchange area of ​​a single heat exchanger is 19.6 , the maximum water flow is 20 / h, the connecting pipe is made of 304 stainless steel with a diameter of φ65mm, and the four plate heat exchangers are divided into two groups. The solution treated by the automatic feedback calcium hydroxide system and the bottom liquid of the distillation tower (22) move in countercurrent to each other. Through the two groups of parallel heat exchangers, the solution treated by the automatic feedback calcium hydroxide system is efficiently preheated, and the temperature of the bottom liquid of the distillation tower (22) is reduced. The preheated solution is pumped into the next treatment link by the fifth centrifugal pump (21).

4. A green and energy-saving treatment device for tungsten smelting solution containing tungsten, molybdenum and ammonia nitrogen according to claim 1, characterized in that: The steam direct heating and automatic control tower top cold spray system is used to distill and remove free ammonia in the preheated solution, realize the treatment and resource utilization of ammonia nitrogen, and is equipped with an automatic control tower top cold spray system to improve the quality of prepared ammonia water, and increase the concentration and purity. A distillation tower (22) is provided, the tower height of the distillation tower (22) is set to 26m, the tower diameter is φ100cm, the tower body is made of 304 carbon steel, the tower is lined with a titanium anti-corrosion layer, the tower plate is made of 316L stainless steel, the filler is 316L serpentine sheet, the tower top ammonia gas delivery pipe is a seamless 10# steel pipe with a diameter of φ100mm, the tower inlet steam pipe is a seamless 10# steel pipe with a diameter of φ65mm, the tower top cold spray pipeline is a 304 stainless steel pipe with a diameter of φ25mm, and the volume of the cold tap water tank (32) is 5 The PPH tank is equipped with an automatic centrifugal pump (33) with a high-lift centrifugal pump, power 2.2 kW, lift 28 m, flow rate 3 / h, the diameter of the water inlet pipe end is φ20mm, the diameter of the water outlet pipe end is φ15mm, the rotation speed is 2900r / min, and the steam is directly transported to the distillation tower (22) through the pipeline. The hot gas runs from the bottom to the top. The solution preheated in the previous step is sprayed from the top of the tower and runs from the top of the tower to the bottom. Through intense heat exchange, free ammonia is separated from the solution in the form of ammonia gas and is transmitted to the next link from the ammonia gas transmission pipeline at the top of the tower. The automatic control tower top cold spray system is linked to the tower top temperature. If the tower top temperature is too high, it is easy to cause flooding and a large amount of water vapor evaporation. At this time, the cold spray pump is started to spray cold tap water to suppress the flooding phenomenon, reduce the generation of water vapor, and improve the concentration and purity of the prepared ammonia water. The ammonia gas formed by the distillation tower (22) is transported to the next process through the pipeline.

5. The green and energy-saving treatment device for tungsten smelting solution containing tungsten, molybdenum and ammonia nitrogen according to claim 1 is characterized by: The water-condensed ammonia and air-cooled circulating water system is used to condense the ammonia-containing gas transported from the top of the distillation tower (22) to prepare high-concentration ammonia water. It is provided with a water-cooled heat exchanger (27). The water-cooled heat exchanger (27) is made of titanium and has a heat exchange area of ​​120 , ammonia storage tank (28), PPH material, volume 10 , connected to the anti-corrosion centrifugal pump (29), power 2.2kw, head 28m, flow rate 3 / h, the diameter of the water inlet pipe end is φ20mm, the diameter of the water outlet pipe end is φ15mm, and the rotation speed is 2900r / min, which is used to transport the condensed ammonia water to the utilization process and return to the use link. The air-cooled circulating water system uses an anti-corrosion centrifugal pump (29) to pump the cooled tap water into the water-cooled heat exchanger (27). The tap water with a higher temperature after heat exchange is transported to the air-cooled circulating water device (30) through a stainless steel pipe. The air-cooled cooling tower has a size of 4m high × 3m wide × 3.5m long. The fan power is 11KW, the packing layer is 2m, the packing layer is made of plastic mesh, and the circulating pipe is made of stainless steel with a diameter of φ180mm to realize the circulation of the water cooling system. In this process, the cooling water will have some evaporation loss, so an automatic water replenishment device (31) is provided. The tap water inlet pipe is associated with the float valve of the water collection tank at the bottom of the tower in the air-cooled circulating water device (30), thereby automatically controlling the liquid level to realize automatic cold water replenishment.

6. A green and energy-saving treatment device for tungsten smelting solution containing tungsten, molybdenum and ammonia nitrogen according to claim 1, characterized in that: The steam automatic feedback regulation system is used to control the temperature at the bottom, middle and top of the tower during the distillation process to ensure the deamination effect while taking into account energy saving and consumption reduction. The system is provided with a steam automatic drain valve (23) to ensure smooth steam transportation and timely discharge of condensed water from the steam in the transportation pipeline. The steam automatic control valve (24) is linked to the temperature probe (26). A total of three sets of steam automatic control valves (24) and temperature probes (26) are provided at the bottom, middle and top of the distillation tower (22). The steam pressure reducing valve (25) ensures the stability of the transportation steam pressure.

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