Arsenide production waste liquid treatment system

Abstract

The utility model discloses a waste liquid treatment system for arsenic hydride production. The waste liquid treatment system comprises a collection reactor, a sedimentation tank and a filter, the collection reactor comprises a collection reactor main body and a stirrer arranged in the collection reactor main body, and a liquid caustic soda adding port is formed in the collection reactor main body; the settling tank comprises a settling tank main body, and a feed port of the settling tank main body is communicated with a discharge port of the collecting reactor main body; the filter comprises a filter main body, a filter cartridge is arranged in the filter main body, the upper end of the filter cartridge is communicated with a pressure cavity, and the pressure cavity is communicated with a liquid outlet of the settling tank main body. And separating particulate matters from the clear liquid through primary natural sedimentation, filtering through a filter bag to remove smaller particulate matters, and recycling the clear liquid as an industrial zinc sulfate solution.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to a system for treating arsine production waste liquid. Background Technology

[0002] The domestic chip market is expanding rapidly, and the demand for arsine, an essential specialty gas in chip manufacturing, is also increasing. Currently, a relatively stable arsine production process involves reacting zinc arsenide with concentrated sulfuric acid under heating conditions. At the end of the reaction, the concentrations of both zinc arsenide and concentrated sulfuric acid decrease simultaneously. Adding more concentrated sulfuric acid would drastically increase the production cost of this portion due to diminishing marginal utility. Therefore, the residual zinc arsenide-sulfuric acid mixture is discharged as waste liquid. Under previous production processes, this waste liquid was treated as hazardous waste after adding an oxidant to oxidize the remaining zinc arsenide, which was costly. Utility Model Content

[0003] The purpose of this invention is to provide a waste liquid treatment system for arsine production to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] An arsine production waste liquid treatment system includes a collection reactor, a sedimentation tank, and a filter;

[0006] The collecting reactor includes a collecting reactor body and a stirrer disposed within the collecting reactor body, and the collecting reactor body is provided with a liquid alkali dosing port;

[0007] The settling tank includes a settling tank body, and the inlet of the settling tank body is connected to the outlet of the collecting reactor body;

[0008] The filter includes a filter body, a filter cylinder is disposed inside the filter body, a pressure chamber is connected to the upper end of the filter cylinder, and the pressure chamber is connected to the liquid outlet of the sedimentation tank body.

[0009] As a further embodiment of this utility model: the main body of the collecting reactor is equipped with a pH meter, a level gauge, and a waste gas outlet.

[0010] As a further embodiment of this utility model: the main body of the collecting reactor is provided with a collecting reactor outlet and a collecting reactor inlet.

[0011] As a further embodiment of this utility model: the sedimentation tank body is provided with a sedimentation tank inlet, which is connected to the discharge port of the collection reactor.

[0012] As a further embodiment of this utility model: the sedimentation tank body is provided with a sedimentation tank exhaust port, a transparent observation tube is provided on one side of the sedimentation tank body, and a transparent observation tube vent valve is provided at the lower end of the transparent observation tube.

[0013] As a further embodiment of this utility model: the lower end of the sedimentation tank body is provided with a sludge discharge valve, the sedimentation tank body is connected to a residue collection tank through the sludge discharge valve, the residue collection tank includes a residue collection tank body, an elevated layer is provided inside the residue collection tank body, a filter assembly is provided on the elevated layer, and a residue collection tank discharge valve is provided at the lower end of the residue collection tank body.

[0014] As a further embodiment of this utility model: a clear liquid discharge port is provided on one side of the sedimentation tank body, a clear liquid discharge port valve is provided at the clear liquid discharge port, the clear liquid discharge port valve is connected to an intermediate water tank, the intermediate water tank includes an intermediate water tank body, an intermediate water tank inlet connected to the clear liquid discharge port valve is provided at the upper end of the intermediate water tank body, an intermediate water tank exhaust port is provided at the upper end of the intermediate water tank body, and an intermediate water tank outlet is provided at the bottom of the intermediate water tank body.

[0015] As a further embodiment of this utility model: the upper end of the filter body is provided with a filter inlet, and the filter inlet is connected to the outlet of the intermediate water tank.

[0016] As a further embodiment of this utility model: the upper end of the filter body is provided with a filter inlet, the filter inlet is connected to the pressure chamber at the upper end of the filter cylinder, the upper end of the pressure chamber is provided with a detachable chamber cover, the chamber cover is detachably connected to the filter body by a quick-release nut, the upper end of the chamber cover is provided with a pressure relief valve, a pressure gauge, and a cover lifting device, one side of the filter body is provided with a nitrogen purging port connected to the pressure chamber, one side of the filter body is provided with a pressure transmitter, and the lower end of the filter body is provided with a discharge port.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. This application involves adding liquid alkali to the waste liquid to completely consume the acid and block the reaction of zinc arsenide. Then, the particulate matter is separated from the clear liquid through preliminary natural sedimentation. The settled particulate matter is discharged into the residue collection tank, and the supernatant is discharged into the intermediate water tank through the valve. After the water tank reaches a certain level, it is pumped to the precision filter. After filtration by the filter bag, smaller particulate matter is removed, and the clear liquid can be recycled as an industrial zinc sulfate solution. This reduces the cost of conventional oxidation treatment and also allows for the recycling of zinc sulfate solution, increasing the economic efficiency of recycling.

[0019] 2. This application involves adding reagents under completely sealed conditions in the collection reactor, reducing the risk of residual gas contact with humans. Simultaneously, the use of a transparent observation tube allows for monitoring the settling effect of the sludge in the settling tank after feeding, by observing the sludge's settling behavior within the transparent tube.

[0020] 3. This application uses a sedimentation tank for preliminary sludge separation, which reduces the frequency of filter bag replacement in the precision filter.

[0021] 4. This application uses nitrogen to purge the precision filter, which removes moisture and any residual arsine gas through high-pressure nitrogen. Attached Figure Description

[0022] Figure 1 This is a flowchart of this embodiment;

[0023] Figure 2 This is a schematic diagram of the reactor used in this embodiment;

[0024] Figure 3 This is a schematic diagram of the sedimentation tank in this embodiment;

[0025] Figure 4 This is a schematic diagram of the intermediate water tank in this embodiment;

[0026] Figure 5 This is a schematic diagram of the filter in this embodiment;

[0027] Figure 6 This is a schematic diagram of the residue collection tank in this embodiment.

[0028] In the picture:

[0029] 101-Collection reactor body, 102-Agitator, 103-Level gauge, 104-pH meter, 105-Liquid alkali dosing port, 106-Waste gas outlet, 107-Collection reactor outlet, 108-Collection reactor inlet;

[0030] 201-Sedimentation tank body, 202-Sedimentation tank inlet, 203-Sedimentation tank exhaust outlet, 204-Transparent observation tube, 205-Transparent observation tube vent valve, 206-Clear liquid discharge outlet, 207-Clear liquid discharge outlet valve, 208-Sludge discharge valve;

[0031] 301 - Main body of intermediate water tank; 302 - Inlet of intermediate water tank; 303 - Exhaust gas outlet of intermediate water tank; 304 - Outlet of intermediate water tank;

[0032] 401-Filter body, 402-Filter inlet, 403-Quick release nut, 404-Pressure relief valve, 405-Pressure gauge, 406-Top cover lifting device, 407-Nitrogen purging port, 408-Pressure transmitter, 409-Filter cartridge, 410-Discharge port;

[0033] 501 - Main body of residue collection tank, 502 - Drain valve of residue collection tank, 503 - Elevated layer. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] Please see Figure 1-5 In this embodiment of the present invention, an arsine production waste liquid treatment system includes a collection reactor, a sedimentation tank, a residue collection tank, an intermediate water tank, and a filter.

[0036] The collection reactor includes a main body 101 and a stirrer 102 installed within the main body 101. The main body 101 is equipped with a liquid alkali dosing port 105, a discharge port 107, and a feed port 108. Additionally, the main body 101 is equipped with a pH meter 104, a level gauge 103, and a waste gas discharge port 106.

[0037] The sedimentation tank includes a sedimentation tank body 201. The inlet of the sedimentation tank body 201 is connected to the outlet of the collection reactor body 101. The sedimentation tank body 201 is provided with a sedimentation tank inlet 202, which is connected to the outlet of the collection reactor 107. The sedimentation tank body 201 is provided with a sedimentation tank exhaust port 203. A transparent observation tube 204 is provided on one side of the sedimentation tank body 201, and a transparent observation tube vent valve 205 is provided at the lower end of the transparent observation tube 204.

[0038] A clear liquid discharge port 206 is provided on one side of the sedimentation tank body 201. A clear liquid discharge port valve 207 is provided at the clear liquid discharge port 206. The clear liquid discharge port valve 207 is connected to an intermediate water tank. The intermediate water tank includes an intermediate water tank body 301. An intermediate water tank inlet 302 connected to the clear liquid discharge port valve 207 is provided at the upper end of the intermediate water tank body 301. An intermediate water tank exhaust port 303 is provided at the upper end of the intermediate water tank body 301. An intermediate water tank outlet 304 is provided at the bottom of the intermediate water tank body 301.

[0039] The filter includes a filter body 401, with a filter inlet 402 at the upper end of the filter body 401, which is connected to the outlet 304 of the intermediate water tank. A filter cylinder 409 is installed inside the filter body 401, with a pressure chamber connected to the upper end of the filter cylinder 409. The pressure chamber is connected to the outlet of the sedimentation tank body 201. The filter inlet 402 is connected to the pressure chamber at the upper end of the filter cylinder 409. A detachable chamber cover is provided at the upper end of the pressure chamber. The chamber cover is detachably connected to the filter body 401 by a quick-release nut 403. A pressure relief valve 404, a pressure gauge 405, and a cover lifting device 406 are provided at the upper end of the chamber cover. A nitrogen purging port 407 connected to the pressure chamber is provided on one side of the filter body 401. A pressure transmitter is provided on one side of the filter body 401. An outlet 410 is provided at the lower end of the filter body 401.

[0040] The sedimentation tank body 201 is equipped with a sludge discharge valve 208 at its lower end. The sedimentation tank body 201 is connected to the residue collection tank through the sludge discharge valve 208. The residue collection tank includes a residue collection tank body 501. The residue collection tank body 501 is equipped with an overhead layer. A filter assembly is installed on the overhead layer. The residue collection tank body 501 is equipped with a residue collection tank discharge valve 502 at its lower end.

[0041] A process for treating arsine production waste liquid includes the following steps:

[0042] Step 1: Collect the arsine production waste liquid into the collection reactor;

[0043] Step 2: Add alkaline solution to the collecting reactor and start stirring. The alkaline solution reacts with the sulfuric acid in the waste liquid.

[0044] Step 3: Monitor the pH value in the collection reactor. When the threshold is reached, introduce the liquid in the collection reactor into the sedimentation tank for solid-liquid separation.

[0045] Step 4: After separation, the liquid is filtered to obtain a zinc sulfate solution.

[0046] In this embodiment, after the arsine production line completes its production and discharges waste liquid into the collection reactor, the agitator is turned on to add alkaline solution to consume the unreacted sulfuric acid. After observing that the pH value reaches a certain value, the addition of alkaline solution is stopped. After stirring and stabilizing for a period of time, the mixture is pumped to the sedimentation tank for solid-liquid separation. The sludge is manually discharged into the residue collection tank after sedimentation. Filter bags are installed in the residue collection tank to naturally filter the discharged residue. The clear liquid at the bottom of the collection tank is returned to the sedimentation tank. After the residue in the filter bags is collected to a certain extent, it is removed and stored and disposed of as hazardous waste at a designated location.

[0047] The supernatant in the sedimentation tank is discharged into the intermediate water tank, and then pumped to a precision filter. The precision filter uses filter bags and cartridges to filter the liquid. When the pressure transmitter on the filter reaches a certain pressure, it sends feedback to the control system to adjust the pump's operating frequency and maintain a certain pressure. After filtration is complete, nitrogen purging is initiated to remove residual moisture and any possible arsine gas using high-pressure nitrogen. The clear liquid discharged from the precision filter, after passing testing, can be used as an industrial zinc sulfate solution.

[0048] After a period of operation, the filter bags in the precision filter need to be replaced. Before opening the top cover, the pressure relief valve needs to be opened, and a portable detector should be used to check for the presence of harmful gases. Then, loosen the quick-release nut, rotate the top cover lifting device, open the top cover, remove the filter bag that needs to be replaced, replace it with a new filter bag, close the top cover, tighten the quick-release nut, and it is ready for the next use. The removed filter bags contain arsenic-containing sludge and should be disposed of as hazardous waste.

[0049] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0050] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A wastewater treatment system for arsine production, characterized in that, Includes collection reactors, sedimentation tanks, and filters; The collection reactor includes a collection reactor body (101) and a stirrer (102) disposed inside the collection reactor body (101). The collection reactor body (101) is provided with a liquid alkali dosing port (105). The settling tank includes a settling tank body (201), and the inlet of the settling tank body (201) is connected to the outlet of the collecting reactor body (101); The filter includes a filter body (401), and a filter cylinder (409) is provided inside the filter body (401). The upper end of the filter cylinder (409) is connected to a pressure chamber, and the pressure chamber is connected to the liquid outlet of the sedimentation tank body (201).

2. The arsine production wastewater treatment system according to claim 1, characterized in that, The main body (101) of the collection reactor is equipped with a pH meter (104), a level gauge (103), and a waste gas outlet (106).

3. The system for treating arsine production waste liquid according to claim 1, wherein The main body (101) of the collecting reactor is provided with a collecting reactor outlet (107) and a collecting reactor inlet (108).

4. The system for treating arsine production waste liquid according to claim 3, wherein The sedimentation tank body (201) is provided with a sedimentation tank inlet (202), which is connected to the discharge port (107) of the collection reactor.

5. The system for treating arsine production waste liquid according to claim 1, wherein The sedimentation tank body (201) is provided with a sedimentation tank exhaust port (203), and a transparent observation tube (204) is provided on one side of the sedimentation tank body (201). A transparent observation tube vent valve (205) is provided at the lower end of the transparent observation tube (204).

6. The system for treating arsine production waste liquid according to claim 1, wherein The sedimentation tank body (201) is provided with a sludge discharge valve (208) at the lower end. The sedimentation tank body (201) is connected to a residue collection tank through the sludge discharge valve (208). The residue collection tank includes a residue collection tank body (501). An elevated layer is provided inside the residue collection tank body (501). A filter assembly is provided on the elevated layer. A residue collection tank discharge valve (502) is provided at the lower end of the residue collection tank body (501).

7. The arsine production wastewater treatment system according to claim 1, characterized in that, The sedimentation tank body (201) has a clear liquid discharge port (206) on one side, and a clear liquid discharge port valve (207) is provided at the clear liquid discharge port (206). The clear liquid discharge port valve (207) is connected to an intermediate water tank. The intermediate water tank includes an intermediate water tank body (301). The upper end of the intermediate water tank body (301) is provided with an intermediate water tank inlet (302) that communicates with the clear liquid discharge port valve (207). The upper end of the intermediate water tank body (301) is provided with an intermediate water tank exhaust port (303). The bottom of the intermediate water tank body (301) is provided with an intermediate water tank outlet (304).

8. The system for treating arsine production waste liquid according to claim 7, wherein The filter body (401) is provided with a filter inlet (402) at the upper end, and the filter inlet (402) is connected to the discharge port (304) of the intermediate water tank.

9. The system for treating arsine production waste liquid according to claim 1, wherein The filter body (401) is provided with a filter inlet (402) at the upper end. The filter inlet (402) is connected to the pressure chamber at the upper end of the filter cylinder (409). The pressure chamber is provided with a detachable chamber cover at the upper end. The chamber cover is detachably connected to the filter body (401) by a quick-release nut (403). The chamber cover is provided with a pressure relief valve (404), a pressure gauge (405), and a cover lifting device (406) at the upper end. The filter body (401) is provided with a nitrogen purging port (407) connected to the pressure chamber on one side. The filter body (401) is provided with a pressure transmitter on one side. The filter body (401) is provided with a discharge port (410) at the lower end.

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