Arsenide production waste liquid treatment system and treatment process

Abstract

The invention discloses an arsenic hydride production waste liquid treatment system which 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] The present invention relates to the technical field of sewage treatment, and specifically to a hydrogen arsenide production waste liquid treatment system and treatment process. Background Art

[0002] At present, the domestic chip market is gradually expanding. As an essential special gas in the chip production process, the market demand for hydrogen arsenide has also increased accordingly. Currently, the relatively stable hydrogen arsenide production process is to react zinc arsenide with concentrated sulfuric acid under heating conditions to produce hydrogen arsenide. At the end of the reaction, since the concentrations of zinc arsenide and concentrated sulfuric acid decrease synchronously, replenishing concentrated sulfuric acid will cause a sharp increase in the production cost of this part due to the marginal utility. Therefore, the remaining mixed solution of zinc arsenide and sulfuric acid is discharged as waste liquid. According to the previous production process, this part of the waste liquid is treated as hazardous waste after adding an oxidant to oxidize the remaining zinc arsenide in it, and the cost is relatively high. Summary of the Invention

[0003] The purpose of the present invention is to provide a hydrogen arsenide production waste liquid treatment system and treatment process to solve the problems raised in the above background art.

[0004] To achieve the above purpose, the present invention provides the following technical solutions:

[0005] A hydrogen arsenide production waste liquid treatment system includes a collection reactor, a precipitation tank, and a filter;

[0006] The collection reactor includes a collection reactor main body and a stirrer arranged in the collection reactor main body. A liquid caustic adding port is arranged on the collection reactor main body;

[0007] The precipitation tank includes a precipitation tank main body. The feed port of the precipitation tank main body is communicated with the discharge port of the collection reactor main body;

[0008] The filter includes 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 chamber, and the pressure chamber is communicated with the liquid outlet of the precipitation tank main body.

[0009] As a further scheme of the present invention: A pH meter, a liquid level meter, and an exhaust gas outlet are arranged on the collection reactor main body.

[0010] As a further scheme of the present invention: A collection reactor discharge port and a collection reactor feed port are arranged on the collection reactor main body.

[0011] As a further scheme of the present invention: A precipitation tank feed port is arranged on the precipitation tank main body, and the precipitation tank feed port is communicated with the collection reactor discharge port.

[0012] As a further solution of the present invention: a waste gas discharge port of the precipitation tank body is provided, a transparent observation tube is arranged on one side of the precipitation tank body, and a transparent observation tube emptying valve is arranged at the lower end of the transparent observation tube.

[0013] As a further solution of the present invention: a sludge discharge valve is arranged at the lower end of the precipitation tank body, the precipitation 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 overhead layer is arranged in the residue collection tank body, a filtering component is arranged on the overhead layer, and a residue collection tank discharge valve is arranged at the lower end of the residue collection tank body.

[0014] As a further solution of the present invention: a clear liquid discharge port is arranged on one side of the precipitation tank body, a clear liquid discharge port valve is arranged 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 feed port communicated with the clear liquid discharge port valve is arranged at the upper end of the intermediate water tank body, a waste gas discharge port of the intermediate water tank is arranged at the upper end of the intermediate water tank body, and an intermediate water tank discharge port is arranged at the bottom of the intermediate water tank body.

[0015] As a further solution of the present invention: a filter feed port is arranged at the upper end of the filter body, and the filter feed port is communicated with the intermediate water tank discharge port.

[0016] As a further solution of the present invention: a filter feed port is arranged at the upper end of the filter body, the filter feed port is communicated with a pressure chamber at the upper end of the filter cartridge, a detachable chamber cover is arranged at the upper end of the pressure chamber, the chamber cover is detachably connected to the filter body through a quick-release nut, a pressure relief valve, a pressure gauge and an upper cover lifting device are arranged at the upper end of the chamber cover, a nitrogen purge port communicated with the pressure chamber is arranged on one side of the filter body, a pressure transmitter is arranged on one side of the filter body, and a discharge port is arranged at the lower end of the filter body.

[0017] A process for treating waste liquid in arsine production includes the following steps:

[0018] Step 1, collecting the waste liquid in arsine production into a collection reactor;

[0019] Step 2, adding an alkali solution into the collection reactor and starting stirring, and the alkali solution reacts with sulfuric acid in the waste liquid;

[0020] Step 3, monitoring the pH value in the collection reactor, and when it reaches the threshold value, introducing the liquid in the collection reactor into a precipitation tank for solid-liquid separation;

[0021] Step 4, filtering the separated liquid to obtain a zinc sulfate solution.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] 1. In this application, liquid caustic soda is added to the waste liquid. After completely consuming the acid liquid therein to block the reaction of zinc arsenide, the particulate matter and the clear liquid are separated by preliminary natural sedimentation. The sedimented particulate matter is discharged into the residue collection tank, and the supernatant is discharged into the intermediate water tank through a valve. After the water tank level reaches a certain amount, it is pumped to a precision filter. After being filtered by the filter bag, smaller particulate matter is removed, and the clear liquid can be recycled as an industrial zinc sulfate solution. On the one hand, the cost of conventional oxidation treatment is reduced, and at the same time, the zinc sulfate solution can be recycled, increasing the economy of recycling.

[0024] 2. In this application, the medicament is added under the condition that the collection reactor is completely sealed, reducing the risk of residual gas contacting the human body. At the same time, a transparent observation tube is adopted, and the sedimentation effect of the sludge in the precipitation tank can be understood by observing the sedimentation status of the sludge in the transparent tube after feeding the precipitation tank.

[0025] 3. In this application, a precipitation tank is used for the preliminary separation of sludge, reducing the replacement frequency of the filter bag in the precision filter.

[0026] 4. In this application, nitrogen is used to purge the precision filter. On the one hand, moisture is further removed through high-pressure nitrogen, and on the other hand, any residual arsine gas therein is removed. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is the flow chart of this embodiment;

[0028] Figure 2 is the schematic diagram of the collection reactor of this embodiment;

[0029] Figure 3 is the schematic diagram of the precipitation tank of this embodiment;

[0030] Figure 4 is the schematic diagram of the intermediate water tank of this embodiment;

[0031] Figure 5 is the schematic diagram of the filter of this embodiment;

[0032] Figure 6 is the schematic diagram of the residue collection tank of this embodiment.

[0033] In the figure:

[0034] 101 - Collection reactor main body, 102 - Stirrer, 103 - Liquid level gauge, 104 - pH meter, 105 - Liquid caustic soda dosing port, 106 - Exhaust gas outlet, 107 - Collection reactor discharge port, 108 - Collection reactor feed port;

[0035] 201 - Precipitation tank main body, 202 - Precipitation tank feed inlet, 203 - Precipitation tank waste gas discharge port, 204 - Transparent observation tube, 205 - Transparent observation tube drain valve, 206 - Clear liquid discharge port, 207 - Clear liquid discharge port valve, 208 - Sludge discharge valve;

[0036] 301 - Intermediate water tank main body, 302 - Intermediate water tank feed inlet, 303 - Intermediate water tank waste gas discharge port, 304 - Intermediate water tank discharge port;

[0037] 401 - Filter main body, 402 - Filter feed inlet, 403 - Quick release nut, 404 - Pressure relief valve, 405 - Pressure gauge, 406 - Upper cover lifting device, 407 - Nitrogen purge port, 408 - Pressure transmitter, 409 - Filter cartridge, 410 - Discharge port;

[0038] 501 - Residue collection tank main body, 502 - Residue collection tank drain valve, 503 - Aerial layer. Detailed implementation manners

[0039] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0040] Please refer to Figures 1-5 , in the embodiments of the present invention, a hydrogen arsenide production waste liquid treatment system includes a collection reactor, a precipitation tank, a residue collection tank, an intermediate water tank, and a filter.

[0041] The collection reactor includes a collection reactor main body 101 and a stirrer 102 arranged in the collection reactor main body 101. A liquid caustic addition port 105 is arranged on the collection reactor main body 101. A collection reactor discharge port 107 and a collection reactor feed inlet 108 are arranged on the collection reactor main body 101. In addition, a pH meter 104, a liquid level meter 103, and a waste gas discharge port 106 are arranged on the collection reactor main body 101.

[0042] The precipitation tank includes a precipitation tank main body 201. The feed inlet of the precipitation tank main body 201 is communicated with the discharge port of the collection reactor main body 101. A precipitation tank feed inlet 202 is arranged on the precipitation tank main body 201. The precipitation tank feed inlet 202 is communicated with the collection reactor discharge port 107. A precipitation tank waste gas discharge port 203 is arranged on the precipitation tank main body 201. A transparent observation tube 204 is arranged on one side of the precipitation tank main body 201. A transparent observation tube drain valve 205 is arranged at the lower end of the transparent observation tube 204.

[0043] On one side of the precipitation tank main body 201, there is a clear liquid discharge port 206. 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 main body 301. At the upper end of the intermediate water tank main body 301, there is an intermediate water tank feed port 302 communicating with the clear liquid discharge port valve 207. At the upper end of the intermediate water tank main body 301, there is an intermediate water tank waste gas discharge port 303. At the bottom of the intermediate water tank main body 301, there is an intermediate water tank discharge port 304.

[0044] The filter includes a filter main body 401. At the upper end of the filter main body 401, there is a filter feed port 402. The filter feed port 402 communicates with the intermediate water tank discharge port 304. Inside the filter main body 401, there is a filter cartridge 409. At the upper end of the filter cartridge 409, there is a pressure chamber connected. The pressure chamber communicates with the liquid outlet of the precipitation tank main body 201. The filter feed port 402 communicates with the pressure chamber at the upper end of the filter cartridge 409. At the upper end of the pressure chamber, there is a detachable chamber cover. The chamber cover is detachably connected to the filter main body 401 through a quick-release nut 403. At the upper end of the chamber cover, there is a pressure relief valve 404, a pressure gauge 405, and an upper cover lifting device 406. On one side of the filter main body 40, there is a nitrogen purge port 407 communicating with the pressure chamber. On one side of the filter main body 401, there is a pressure transmitter. At the lower end of the filter main body 401, there is a discharge port 410.

[0045] At the lower end of the precipitation tank main body 201, there is a sludge discharge valve 208. The precipitation tank main body 201 is connected to a residue collection tank through the sludge discharge valve 208. The residue collection tank includes a residue collection tank main body 501. Inside the residue collection tank main body 501, there is an overhead layer. A filter assembly is arranged on the overhead layer. At the lower end of the residue collection tank main body 501, there is a residue collection tank discharge valve 502.

[0046] A process for treating arsenic hydride production waste liquid includes the following steps:

[0047] Step 1: Collect arsenic hydride production waste liquid into a collection reactor;

[0048] Step 2: Add alkali solution to the collection reactor and start stirring. The alkali solution reacts with sulfuric acid in the waste liquid;

[0049] Step 3: Monitor the pH value in the collection reactor. When it reaches the threshold, transfer the liquid in the collection reactor into a precipitation tank for solid-liquid separation;

[0050] Step 4: Filter the separated liquid to obtain a zinc sulfate solution.

[0051] In this embodiment, after the waste liquid discharged during the production of arsine enters the collection reactor, the agitator is started to add lye to consume the unreacted sulfuric acid. After observing that the pH value reaches a certain value, the addition of lye is stopped. After stirring and stabilizing for a period of time, the mixed liquid is lifted to the sedimentation tank by a water pump for solid-liquid separation. The sludge is manually discharged into the residue collection tank after precipitation. A filter bag is laid 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, and when the residue in the filter bag is collected to a certain extent, it is taken out and stored and disposed of at a designated hazardous waste site.

[0052] The supernatant in the sedimentation tank is discharged into the intermediate water tank and then sent to the precision filter by a water pump. In the precision filter, a filter bag and filter cartridge are used to filter the clear liquid. When the pressure transmitter set on it reaches a certain pressure, it feeds back to the control system to adjust the operating frequency of the water pump to maintain a certain pressure. After the filtration is completed, nitrogen purging is started to remove the residual moisture and possible arsine gas in it through high-pressure nitrogen. The clear liquid discharged from the precision filter can be used as industrial zinc sulfate solution after passing the detection.

[0053] After the precision filter operates for a period of time, the filter bag in it needs to be replaced. Before opening the upper cover, the pressure relief valve needs to be opened, and a portable detector is used to detect whether there are harmful gases in it. Then the quick-release nut is loosened, the upper cover lifting device is rotated, and after the upper cover is opened, the filter bag to be replaced is taken out, a new filter bag is replaced, and then the upper cover is closed and the quick-release nut is tightened, and it can be put into the next use. The taken-out filter bag contains arsenic-containing sludge and is also disposed of as hazardous waste.

[0054] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0055] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard 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 system for treating waste liquid from arsenic production, characterized in that: It includes a collection reactor, a settling tank, and a filter; The collecting reactor comprises a collecting reactor body (101) and a stirrer (102) arranged in the collecting reactor body (101); the collecting reactor body (101) is provided with a liquid alkali dosing port (105); The precipitation tank comprises a precipitation tank body (201), and the feed inlet of the precipitation tank body (201) is connected to the discharge outlet of the collection reactor body (101); The filter comprises a filter body (401), a filter cartridge (409) is arranged inside the filter body (401), an upper end of the filter cartridge (409) is connected to a pressure chamber, and the pressure chamber is connected to a liquid outlet of the sedimentation tank body (201).

2. The system for treating waste liquid from arsenic production according to claim 1, characterized in that: The collection reactor body (101) is provided with a pH meter (104), a liquid level meter (103), and a waste gas outlet (106).

3. The system for treating waste liquid from arsenic production according to claim 1, characterized in that: The collecting reactor body (101) is provided with a collecting reactor discharge port (107) and a collecting reactor feed port (108).

4. The system for treating waste liquid from arsenic production according to claim 3, characterized in that: The precipitation tank body (201) is provided with a precipitation tank feed port (202), and the precipitation tank feed port (202) is connected to the collection reactor discharge port (107).

5. The system for treating waste liquid from arsenic production according to claim 1, characterized in that: The sedimentation tank body (201) is provided with a sedimentation tank waste gas outlet (203), a transparent observation tube (204) is provided on one side of the sedimentation tank body (201), and a transparent observation tube emptying valve (205) is provided at the lower end of the transparent observation tube (204).

6. The system for treating waste liquid from arsenic production according to claim 1, characterized in that: A sludge discharge valve (208) is provided at the lower end of the sedimentation tank body (201), and the sedimentation tank body (201) is connected to a residue collection tank via the sludge discharge valve (208). The residue collection tank comprises a residue collection tank body (501), an overhead layer is provided in the residue collection tank body (501), a filter assembly is provided on the overhead layer, and a residue collection tank discharge valve (502) is provided at the lower end of the residue collection tank body (501).

7. The system for treating waste liquid from arsenic production according to claim 1, characterized in that: 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 comprises an intermediate water tank body (301), an intermediate water tank feed port (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 waste gas discharge port (303) is provided at the upper end of the intermediate water tank body (301), and an intermediate water tank discharge port (304) is provided at the bottom of the intermediate water tank body (301).

8. The system for treating waste liquid from arsenic production according to claim 7, characterized in that: A filter feed inlet (402) is provided at the upper end of the filter body (401), and the filter feed inlet (402) is communicated with the middle water tank outlet (304).

9. The system for treating waste liquid from arsenic production according to claim 1, characterized in that: The filter body (401) is provided with a filter feed port (402) at the upper end, the filter feed port (402) is communicated with the pressure chamber at the upper end of the filter cartridge (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) via a quick-release nut (403), the chamber cover is provided with a pressure relief valve (404), a pressure gauge (405), and an upper cover lifting device (406) at the upper end, the filter body (40) is provided with a nitrogen purge port (407) communicated with the pressure chamber at one side, the filter body (401) is provided with a pressure transmitter at one side, and the filter body (401) is provided with a discharge port (410) at the lower end.

10. A process for treating waste liquid from arsenic production, characterized in that: The following steps are involved: Step 1, collecting arsenic hydrogen production waste liquid into a collection reactor; Step 2, adding alkali solution into the collection reactor and starting stirring, so that the alkali solution reacts with sulfuric acid in the waste liquid; Step 3, monitoring the pH value in the collection reactor, and when the pH value reaches a threshold, introducing the liquid in the collection reactor into a precipitation tank for solid-liquid separation; Step 4: After separation, the liquid is filtered to obtain a zinc sulfate solution.

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