CN215975320U - Device for removing arsenic by using vulcanization method in waste acid - Google Patents
Device for removing arsenic by using vulcanization method in waste acid Download PDFInfo
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- CN215975320U CN215975320U CN202122405037.0U CN202122405037U CN215975320U CN 215975320 U CN215975320 U CN 215975320U CN 202122405037 U CN202122405037 U CN 202122405037U CN 215975320 U CN215975320 U CN 215975320U
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Abstract
The utility model discloses a device for removing arsenic in waste acid by a vulcanization method, which comprises the following steps: the device comprises a sealed reactor and a dosing device, wherein a constant pressure valve is arranged on the sealed reactor, a plate-and-frame filter press is arranged at the bottom of the sealed reactor, the dosing device is connected with the sealed reactor through a sodium sulfide solution conveying pipeline, a stirring device is arranged in the sealed reactor, and a tail gas absorption device is connected to the other end of the constant pressure valve and used for treating a small amount of tail gas discharged by the constant pressure valve. The device simple structure, convenient to use makes the hydrogen sulfide of loss can combine more arsenic at sealed reactor to improve the sodium sulfide utilization ratio and reduce the unit consumption that actually need add the sodium sulfide.
Description
Technical Field
The utility model belongs to the technical field of acid recovery treatment, and particularly relates to a device for removing arsenic in waste acid by a vulcanization method.
Background
In the process of carrying out the examination and verification of the clean production, the consumption of raw and auxiliary materials for treating waste acid generated in the production process of copper companies is increased, and the cost is continuously increased. The unit consumption of sodium sulfide for treating each ton of waste acid is correspondingly increased under the restriction of comprehensive factors such as increase of arsenic-containing index and price rise of raw materials. At present, the main mechanism for removing arsenic in waste acid by using sodium sulfide is that hydrogen sulfide is generated under an acidic condition and then is combined with arsenic to generate arsenic trisulfide precipitate, and because the hydrogen sulfide is gaseous and toxic at normal temperature, the hydrogen sulfide is generally pumped by an exhaust fan and then absorbed during production, so that the loss of the hydrogen sulfide is large, the environment can be polluted, the utilization rate of the sodium sulfide is low, and the unit consumption is increased.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects in the prior art and provide a device for removing arsenic from waste acid by a vulcanization method. The device simple structure, convenient to use makes the hydrogen sulfide of loss can combine more arsenic at sealed reactor to improve the sodium sulfide utilization ratio and reduce the unit consumption that actually need add the sodium sulfide.
In order to achieve the purpose, the utility model discloses a device for removing arsenic in waste acid by a vulcanization method, which comprises the following steps: the device comprises a sealed reactor and a dosing device, wherein a constant-pressure valve is arranged on the sealed reactor, a plate-and-frame filter press is arranged at the bottom of the sealed reactor, the dosing device is connected with the sealed reactor through a sodium sulfide solution conveying pipeline, a stirring device is arranged in the sealed reactor, and a tail gas absorption device is connected to the other end of the constant-pressure valve and used for treating a small amount of tail gas discharged by the constant-pressure valve.
Furthermore, a dosing metering pump is arranged on the sodium sulfide solution conveying pipeline and used for controlling the amount of the sodium sulfide solution conveyed into the sealed reactor.
Still further, a bottom discharge valve is arranged between the bottom of the reactor and the plate-and-frame filter press. Because the added sodium sulfide and arsenic and other heavy metal ions in the waste acid to be treated form a large amount of precipitates, the solid-liquid separation can be effectively carried out by using a plate-and-frame filter press after the complete reaction, and the discharge treatment of impurities in the reactor is facilitated.
And further, the constant-pressure valve is a diaphragm valve, and the air pressure of the sealed reactor is controlled to be 0.02-0.05 MPa. More preferably, a check valve is arranged between the constant pressure valve and the tail gas absorption device, so that the tail gas in the tail gas absorption device can be prevented from flowing back.
The use method of the device for removing arsenic by a vulcanization method in waste acid comprises the following steps:
adding the prepared sodium sulfide solution into a dosing device, slowly conveying the sodium sulfide solution into a sealed reactor, starting a stirrer to promote the acid solution to react with sodium sulfide, forming gas positive pressure in the space of the sealed reactor by using the hydrogen sulfide gas escaped from the reaction, controlling the pressure in the sealed reactor to be 0.02-0.05 MPa through a constant pressure valve, and maintaining for a period of time to promote the hydrogen sulfide to fully react so as to effectively improve the arsenic removal efficiency of the reaction.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus for removing arsenic from waste acid by a sulfurization method.
Detailed Description
The device for removing arsenic by a vulcanization method in waste acid of the utility model is further described in detail by combining the attached drawings and specific examples of the specification.
Example 1
The device for removing arsenic from waste acid by a vulcanization method as shown in the attached figure 1 comprises a sealed reactor 1 and a dosing device 2, wherein a constant-pressure valve 3 is arranged on the sealed reactor 1, the constant-pressure valve 3 controls the air pressure of the sealed reactor 1 to be 0.02-0.05 MPa, a plate-and-frame filter press 5 is arranged at the bottom of the sealed reactor 1, and a bottom discharge valve 9 is arranged between the bottom of the sealed reactor 1 and the plate-and-frame filter press 5. Be connected with sodium sulfide solution pipeline 6 between charge device 2 and sealed reactor 1, be provided with one on the sodium sulfide solution pipeline 6 and add medicine measuring pump 7, be provided with agitating unit 8 in the sealed reactor 1, the other termination of constant pressure valve 3 has tail gas absorbing device 4, constant pressure valve 3 with be provided with a check valve 10 between the tail gas absorbing device 4.
The waste acid in a certain section of the production process of a certain copper factory in Henan Jiyuan is treated by using a device for removing arsenic by a vulcanization method in the waste acid, the acid concentration is detected to be 23 percent, and the waste acid contains 110ppm of arsenic. Firstly, taking 100L of waste acid to be treated in a sealed reactor 1, opening a stirrer for stirring, and well sealing; preparing a sodium sulfide solution with the mass concentration of 20%, wherein the addition amount of sodium sulfide (in terms of S content) is 4 times of the arsenic content in waste acid and is added into a dosing device; slowly adding a sodium sulfide solution into the sealed reactor 1 through a sodium sulfide solution conveying pipeline 6 for reaction, and controlling and keeping the pressure in the sealed reactor 1 to be 0.03MPa through a constant-pressure valve 3; after stirring and reacting for 1h, filtering the mixed solution in the sealed reactor 1, detecting that the content of arsenic in the filtrate reaches 1ppm, and effectively removing arsenic in the waste acid to be treated.
Claims (5)
1. The utility model provides a device for arsenic is removed with vulcanization method in spent acid which characterized in that: the device comprises a sealed reactor (1) and a dosing device (2), wherein a constant-pressure valve (3) is arranged on the sealed reactor (1), a plate-and-frame filter press (5) is arranged at the bottom of the sealed reactor (1), a sodium sulfide solution conveying pipeline (6) is connected between the dosing device (2) and the sealed reactor (1), a stirring device (8) is arranged in the sealed reactor (1), and a tail gas absorption device (4) is connected to the other end of the constant-pressure valve (3).
2. Device for the sulphur removal of arsenic from spent acid according to claim 1, characterised in that: a dosing metering pump (7) is arranged on the sodium sulfide solution conveying pipeline (6).
3. Device for the sulphur removal of arsenic from spent acid according to claim 1, characterised in that: a bottom discharge valve (9) is arranged between the bottom of the reactor (1) and the plate-and-frame filter press (5).
4. Device for the sulphur removal of arsenic from spent acid according to claim 1, characterised in that: the constant-pressure valve (3) is a diaphragm valve, and the air pressure of the sealed reactor (1) is controlled to be 0.02-0.05 MPa by the constant-pressure valve (3).
5. Device for the sulphur removal of arsenic from spent acid according to claim 1, characterised in that: a check valve (10) is arranged between the constant pressure valve (3) and the tail gas absorption device (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122405037.0U CN215975320U (en) | 2021-09-30 | 2021-09-30 | Device for removing arsenic by using vulcanization method in waste acid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122405037.0U CN215975320U (en) | 2021-09-30 | 2021-09-30 | Device for removing arsenic by using vulcanization method in waste acid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215975320U true CN215975320U (en) | 2022-03-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122405037.0U Active CN215975320U (en) | 2021-09-30 | 2021-09-30 | Device for removing arsenic by using vulcanization method in waste acid |
Country Status (1)
| Country | Link |
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| CN (1) | CN215975320U (en) |
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2021
- 2021-09-30 CN CN202122405037.0U patent/CN215975320U/en active Active
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