Vanadium extraction wastewater ammonia recovery device

Abstract

The utility model discloses a vanadium extraction wastewater ammonia recovery device which comprises a deamination tower, an absorption tower, a wastewater pump, a liquid caustic soda pump, a reboiler, a deamination circulating pump, a premixing tank, an ammonium sulfate liquid outlet pump, an ammonium sulfate circulating pump and an ammonium sulfate storage tank, liquid inlet pipes of the wastewater pump and the liquid caustic soda pump are respectively connected with a wastewater pool and the liquid caustic soda storage tank, and a liquid outlet pipe is connected with the top of the deamination tower; a steam inlet of the reboiler is connected with a steam source, a liquid inlet of the reboiler is connected with the bottom of the deamination tower through a deamination circulating pump, and a liquid outlet of the reboiler is connected with the middle lower part of the deamination tower; the top of the deamination tower is connected with the bottom of the absorption tower through a steam circulator; the top of the absorption tower is connected with the bottom of the deamination tower through a pipeline; the premixing tank is connected with the bottom of the absorption tower through a pipeline and connected with the top of the absorption tower through an ammonium sulfate circulating pump; and the bottom of the premixing tank is connected with an ammonium sulfate storage tank through an ammonium sulfate liquid outlet pump. The device can effectively recover ammonium in the vanadium extraction wastewater, reduce resource waste and avoid environmental pollution.

Description

Technical Field

[0001] The utility model relates to an ammonia recovery device for vanadium extraction wastewater, which can effectively recover ammonium in vanadium extraction wastewater (also known as vanadium precipitation wastewater), and belongs to the technical field of wastewater treatment. Background Art

[0002] At present, in the vanadium extraction process using vanadium-titanium magnetite as raw material, after the vanadium slag is subjected to sodiumization (calcium method) roasting and water leaching for vanadium extraction, it enters the vanadium precipitation process, and then ammonium salts (ammonium sulfate, ammonium chloride, ammonium carbonate, ammonium bicarbonate) are added for precipitation reaction. The unreacted ammonium ions enter the supernatant of vanadium precipitation, that is, vanadium extraction wastewater. The ammonia nitrogen content in the vanadium extraction wastewater (above 3000 - 5500 mg / L) seriously exceeds the standard. Direct discharge not only pollutes the environment but also causes serious waste of resources. Therefore, it is of great significance to recover ammonium in vanadium extraction wastewater. Content of the Utility Model

[0003] The purpose of the utility model is to provide an ammonia recovery device for vanadium extraction wastewater aiming at the drawbacks of the existing technology, so as to effectively recover ammonium in vanadium extraction wastewater, reduce serious waste of resources and avoid environmental pollution.

[0004] To achieve the above purpose, the utility model adopts the following technical solutions:

[0005] An ammonia recovery device for vanadium extraction wastewater includes a deammoniation tower, an absorption tower, a wastewater tank, a wastewater pump, a liquid caustic soda storage tank, a liquid caustic soda pump, a reboiler, a deammoniation circulation pump, a steam circulation machine, a premixing tank, an ammonium sulfate outlet pump, an ammonium sulfate circulation pump and an ammonium sulfate storage tank. The inlet pipes of the wastewater pump and the liquid caustic soda pump are respectively connected to the wastewater tank and the liquid caustic soda storage tank, and the outlet pipes are connected to the top of the deammoniation tower; the steam inlet of the reboiler is connected to a steam source, the inlet liquid port is connected to the bottom of the deammoniation tower through the deammoniation circulation pump, and the outlet liquid port is connected to the middle and lower part of the deammoniation tower; the top of the deammoniation tower is connected to the bottom of the absorption tower through the steam circulation machine; the top of the absorption tower is connected to the bottom of the deammoniation tower through a pipeline; the premixing tank is connected to the bottom of the absorption tower through a pipeline and is connected to the top of the absorption tower through the ammonium sulfate circulation pump; the bottom of the premixing tank is connected to the ammonium sulfate storage tank through the ammonium sulfate outlet pump.

[0006] For the above ammonia recovery device for vanadium extraction wastewater, the outlet pipes of the wastewater pump and the liquid caustic soda pump are connected to the deammoniation tower through a pressurizing pump. The outlet of the pressurizing pump is connected to the top of the deammoniation tower through a pipeline, and the outlet pipes of the wastewater pump and the liquid caustic soda pump are connected to the inlet of the pressurizing pump after being connected.

[0007] For the above ammonia recovery device for vanadium extraction wastewater, it further includes a water outlet pump and a shell-and-tube heat exchanger. The shell side of the heat exchanger is installed in the middle of the outlet pipe of the wastewater pump. The inlet pipe of the water outlet pump is connected to the middle and lower part of the deammoniation tower, the outlet pipe is connected to the inlet of the tube side of the heat exchanger, and the outlet of the tube side of the heat exchanger is connected to a waste discharge pipe.

[0008] The above-mentioned ammonia recovery device for vanadium extraction wastewater further includes a concentrated sulfuric acid tank, and the premixing tank is connected to the concentrated sulfuric acid tank and production water through pipelines.

[0009] In the above-mentioned ammonia recovery device for vanadium extraction wastewater, three sections of packing are arranged from top to bottom inside both the ammonia stripping tower and the absorption tower.

[0010] In the above-mentioned ammonia recovery device for vanadium extraction wastewater, water distributors are provided at the tops of both the ammonia stripping tower and the absorption tower, and liquid collection tanks are provided at the bottoms.

[0011] In the above-mentioned ammonia recovery device for vanadium extraction wastewater, the reboiler has a shell-and-tube structure.

[0012] In the above-mentioned ammonia recovery device for vanadium extraction wastewater, the steam circulation machine is an induced draft fan.

[0013] The utility model uses an ammonia stripping tower to remove ammonia from vanadium extraction wastewater, and uses an absorption tower to convert ammonia into ammonium sulfate for recovery. It can effectively recover ammonium in vanadium extraction wastewater, reduce waste of resources, and avoid environmental pollution. The utility model has a high recovery rate and a large water treatment capacity, and is suitable for large-scale continuous industrial production. Brief Description of the Drawings

[0014] The following further elaborates on the utility model in detail in conjunction with the drawings and specific embodiments.

[0015] Figure 1 is a structural schematic diagram of the utility model.

[0016] The labels in the figure are as follows: 1, heat exchanger; 2, reboiler; 3, ammonia stripping tower; 4, absorption tower; 5, concentrated sulfuric acid tank; 6, premixing tank; 7, steam circulation machine; 8, ammonia stripping circulation pump; 9, ammonium sulfate storage tank; 10, ammonium sulfate liquid discharge pump; 11, ammonium sulfate circulation pump; 12, wastewater pump; 13, water discharge pump; 14, wastewater tank; 15, liquid caustic soda storage tank; 16, liquid caustic soda pump; 17, pressure pump. Specific Embodiments

[0017] Refer to Figure 1 , the utility model mainly includes a heat exchanger 1, a reboiler 2, an ammonia stripping tower 3, an absorption tower 4, a concentrated sulfuric acid tank 5, a premixing tank 6, a steam circulation machine 7, an ammonia stripping circulation pump 8, an ammonium sulfate storage tank 9, an ammonium sulfate liquid discharge pump 10, an ammonium sulfate circulation pump 11, a wastewater pump 12, a water discharge pump 13, a wastewater tank 14, a liquid caustic soda storage tank 15, a liquid caustic soda pump 16 and a pressure pump 17.

[0018] Both the deammoniation tower 3 and the absorption tower 4 are internally provided with three sections of packing arranged from top to bottom. The tops of the deammoniation tower 3 and the absorption tower 4 are both provided with water distributors, and the bottoms are provided with liquid collection tanks; the reboiler 2 has a tube-and-shell structure, steam is introduced into the tubes, and the wastewater exchanges heat outside the tubes. When the wastewater generates steam, the ammonium in the wastewater can be removed; the steam circulation machine 7 is an induced draft fan, and the heat exchanger 1 is a shell-and-tube heat exchanger.

[0019] The wastewater tank 14 is used to store the vanadium extraction wastewater, the liquid caustic soda storage tank 15 is used to store liquid caustic soda, and concentrated sulfuric acid is stored in the concentrated sulfuric acid tank 5.

[0020] Figure 1 It is shown that the inlet pipe of the liquid caustic soda pump 16 is connected to the liquid caustic soda storage tank 15, and the outlet pipe is connected to the inlet of the pressure pump 17. The outlet of the pressure pump 17 is connected to the water distributor at the top of the deammoniation tower 3 through a pipeline; the inlet pipe of the wastewater pump 12 is connected to the wastewater tank 14, and the outlet pipe is connected to the inlet of the shell side of the heat exchanger 1. The outlet of the shell side of the heat exchanger 1 is connected to the inlet of the pressure pump 17 through a pipeline. The inlet pipe of the water outlet pump 13 is connected to the middle and lower part of the deammoniation tower 3, and the outlet pipe is connected to the inlet of the tube side of the heat exchanger 1. The outlet of the tube side of the heat exchanger 1 is connected to the waste discharge pipe; the steam inlet of the reboiler 2 is connected to the steam source. The inlet pipe of the deammoniation circulation pump 8 is connected to the liquid collection tank at the bottom of the deammoniation tower 3, and the outlet pipe is connected to the inlet of the reboiler 2. The outlet of the reboiler 2 is connected to the middle and lower part of the deammoniation tower 3 through a pipeline; the inlet pipe of the steam circulation machine 7 is connected to the top of the deammoniation tower 3, and the outlet pipe is connected to the bottom of the absorption tower 4; the top of the absorption tower 4 is connected to the bottom of the deammoniation tower 3 through a pipeline; the inlet pipe of the ammonium sulfate circulation pump 11 is connected to the premixing tank 6, and the outlet pipe is connected to the water distributor at the top of the absorption tower 4. The three inlet ports of the premixing tank 6 are respectively connected to the production water, the concentrated sulfuric acid tank 5 and the liquid collection tank at the bottom of the absorption tower 4. The inlet pipe of the ammonium sulfate outlet pump 10 is connected to the bottom of the premixing tank 6, and the outlet pipe is connected to the ammonium sulfate storage tank 9.

[0021] The working principle of the present utility model is as follows:

[0022] The vanadium extraction wastewater in the wastewater tank 14 is pumped into the shell side of the heat exchanger 1 by the wastewater pump 12. The waste liquid at the bottom of the deammoniation tower 3 is pumped into the tube side of the heat exchanger 1 by the water outlet pump 13. The vanadium extraction wastewater exchanges heat with the waste liquid in the heat exchanger 1 to be heated. The heated vanadium extraction wastewater is mixed with the liquid caustic soda provided by the liquid caustic soda pump 16 and then enters the water distributor at the top of the deammoniation tower 3 through the pressure pump 17. The vanadium extraction wastewater enters the liquid collection tank at the bottom of the deammoniation tower 3 after passing through three sections of packing from the top of the deammoniation tower 3. The vanadium extraction wastewater at the bottom of the deammoniation tower 3 is pumped into the reboiler 2 by the deammoniation circulation pump 8, heated by steam and then pumped back to the middle and lower parts of the deammoniation tower 3. The vanadium extraction wastewater circulates in the middle and lower parts of the deammoniation tower 3 under the action of the deammoniation circulation pump 8, and ammonia gas is removed during the circulation of the vanadium extraction wastewater in the deammoniation tower 3. The ammonia gas enters the bottom of the absorption tower 4 under the attraction of the steam circulation machine 7. The concentrated sulfuric acid stored in the concentrated sulfuric acid tank 5 is mixed with production water in the premixing tank 6 to form dilute sulfuric acid. The bottom of the absorption tower 4 is connected to the premixing tank 6 through a pipeline. The ammonium sulfate circulation pump 11 extracts the dilute sulfuric acid in the premixing tank 6 and then pumps it into the water distributor at the top of the absorption tower 4. The ammonium sulfate solution formed by the reaction of the dilute sulfuric acid and the ammonia gas in the absorption tower 4 returns to the bottom of the absorption tower 4 for use as a precipitant. The ammonium sulfate solution circulates in the absorption tower 4 under the action of the ammonium sulfate circulation pump 11. The unabsorbed ammonia gas returns to the middle and lower parts of the deammoniation tower 3 through the pipeline. When the concentration of the ammonium sulfate solution in the premixing tank 6 reaches the set value, the ammonium sulfate outlet pump 10 is started to pump the ammonium sulfate solution into the ammonium sulfate storage tank 9.

[0023] The utility model has a simple structure and convenient construction. The ammonia nitrogen treatment rate can reach over 99%, and the ammonia nitrogen content in the waste liquid is lower than 10 mg / L, meeting the national environmental protection requirements. At the same time, the ammonium sulfate generated by recycling ammonium is returned for use as a precipitant, reducing the production cost. The utility model can enhance the product competitiveness, having significant economic and social benefits and meeting the requirements of green production.

Claims

1. A vanadium extraction wastewater ammonia recovery device, characterized in that It includes a deammoniation tower (3), an absorption tower (4), a waste water tank (14), a waste water pump (12), a liquid caustic soda storage tank (15), a liquid caustic soda pump (16), a reboiler (2), a deammoniation circulation pump (8), a steam circulation machine (7), a premixing tank (6), an ammonium sulfate outlet pump (10), an ammonium sulfate circulation pump (11) and an ammonium sulfate storage tank (9). The inlet pipes of the waste water pump (12) and the liquid caustic soda pump (16) are respectively connected to the waste water tank (14) and the liquid caustic soda storage tank (15), and the outlet pipes are connected to the top of the deammoniation tower (3); the steam inlet of the reboiler (2) is connected to a steam source, the liquid inlet is connected to the bottom of the deammoniation tower (3) through the deammoniation circulation pump (8), and the liquid outlet is connected to the middle and lower part of the deammoniation tower (3); the top of the deammoniation tower (3) is connected to the bottom of the absorption tower (4) through the steam circulation machine (7); the top of the absorption tower (4) is connected to the bottom of the deammoniation tower (3) through a pipeline; the premixing tank (6) is connected to the bottom of the absorption tower (4) through a pipeline and is connected to the top of the absorption tower (4) through the ammonium sulfate circulation pump (11); the bottom of the premixing tank (6) is connected to the ammonium sulfate storage tank (9) through the ammonium sulfate outlet pump (10).

2. The vanadium extraction wastewater ammonia recovery device according to claim 1, characterized in that, The outlet pipes of the waste water pump (12) and the liquid caustic soda pump (16) are connected to the deammoniation tower (3) through a pressure pump (17). The outlet of the pressure pump (17) is connected to the top of the deammoniation tower (3) through a pipeline, and the outlet pipes of the waste water pump (12) and the liquid caustic soda pump (16) are connected to the inlet of the pressure pump (17) after being connected together.

3. The vanadium extraction wastewater ammonia recovery device according to claim 1 or 2, characterized in that, It also includes a water outlet pump (13) and a shell-and-tube heat exchanger (1). The shell side of the heat exchanger (1) is installed in the middle of the outlet pipe of the waste water pump (12). The inlet pipe of the water outlet pump (13) is connected to the middle and lower part of the deammoniation tower (3), the outlet pipe is connected to the inlet of the tube side of the heat exchanger (1), and the outlet of the tube side of the heat exchanger (1) is connected to a waste discharge pipe.

4. The vanadium extraction wastewater ammonia recovery device according to claim 3, characterized in that, It also includes a concentrated sulfuric acid tank (5). The premixing tank (6) is connected to the concentrated sulfuric acid tank (5) and production water through pipelines.

5. The vanadium extraction wastewater ammonia recovery device according to claim 4, characterized in that, Three sections of packing are arranged in the deammoniation tower (3) and the absorption tower (4) from top to bottom.

6. The vanadium extraction wastewater ammonia recovery device according to claim 5, characterized in that, The tops of the deammoniation tower (3) and the absorption tower (4) are both provided with water distributors, and the bottoms are both provided with liquid collecting tanks.

7. The vanadium extraction wastewater ammonia recovery device according to claim 6, characterized in that, The reboiler (2) is of a tube-in-shell structure.

8. The vanadium extraction wastewater ammonia recovery device according to claim 7, characterized in that, The steam circulation machine (7) is an induced draft fan.

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