A copper anode slime smelting wastewater treatment system

Abstract

The utility model provides a kind of copper anode slime smelting wastewater treatment system, including the acid wastewater tank of sequentially connected, first reaction pool, first water production storage tank, second reaction pool, second water production storage tank, deaminating membrane system and deaminating water tank, the acidic wastewater pump in the acidic wastewater tank is added lye to first reaction pool and adjusts pH value and precipitates heavy metal, and upper clear liquid is pumped into second reaction pool after first water production storage tank and adds acid liquid to adjust pH value and heavy metal capturing agent and further precipitates heavy metal, and upper clear liquid is pumped into deaminating membrane system after second water production storage tank and deaminates, wastewater enters deaminating water tank. The utility model can effectively reduce the heavy metal content in wastewater, reduce subsequent sewage treatment station processing pressure, reduce energy consumption.

Description

Technical Field

[0001] This utility model relates to the field of industrial wastewater treatment technology, and more specifically to a wastewater treatment system for copper anode mud smelting. Background Technology

[0002] The current process for recovering precious metals from copper anode mud is as follows: sulfation roasting – copper separation – gold separation – silver separation – refining. This process generates a large amount of acidic and alkaline wastewater. The acidic wastewater is characterized by strong acidity (pH < 1) and high concentration of heavy metals; the alkaline wastewater is characterized by strong alkalinity (pH > 13), low concentration of heavy metals, and ammonia nitrogen concentration that can reach tens of thousands of mg / L.

[0003] When treating wastewater, acidic wastewater often requires further treatment after incomplete removal of heavy metals. This results in high pressure on the downstream wastewater treatment plant, which lacks the capacity to treat ammonia nitrogen, leading to substandard effluent. Utility Model Content

[0004] This invention proposes a wastewater treatment system for copper anode mud smelting, which can effectively reduce the heavy metal and ammonia nitrogen content in the wastewater and reduce the treatment pressure on subsequent sewage treatment plants.

[0005] The technical solution of this utility model is implemented as follows: A copper anode mud smelting wastewater treatment system includes an acidic wastewater tank, a primary reaction tank, a primary product water storage tank, a secondary reaction tank, a secondary product water storage tank, an ammonia removal membrane system, and an ammonia removal product water tank connected in sequence. The acidic wastewater in the acidic wastewater tank is pumped to the primary reaction tank to add alkaline solution to adjust the pH value and precipitate heavy metals. The supernatant is pumped to the primary product water storage tank and then pumped into the secondary reaction tank to add acid solution to adjust the pH value and a heavy metal scavenging agent to further precipitate heavy metals. The supernatant is pumped to the secondary product water storage tank and then pumped into the ammonia removal membrane system for ammonia removal. After ammonia removal, the wastewater enters the ammonia removal product water tank.

[0006] Preferably, the sediment settled in the primary reaction tank is pumped to the first filter press for filtration, and the filtrate is then sent to the primary product water storage tank.

[0007] Preferably, the sediment settled in the secondary reaction tank is pumped to the first filter press for filtration, and the filtrate is sent to the primary product water storage tank.

[0008] Preferably, the system further includes an alkaline wastewater tank, an adjusting tank, a second filter press, a filter press water tank, and an ammonia stripping tower connected in sequence. The alkaline wastewater in the alkaline wastewater tank is pumped to the adjusting tank to add alkaline solution to adjust the pH value and precipitate heavy metals. After the mixture is filtered by the second filter press, the filtrate is added to the filter press water tank to add alkaline solution to adjust the pH value and then pumped to the ammonia stripping tower for ammonia stripping.

[0009] Preferably, the ammonia stripping tower is also connected to an acidic wastewater tank, and the wastewater after ammonia stripping in the ammonia stripping tower is cooled by a heat exchanger and then sent to the acidic wastewater tank.

[0010] The beneficial effects of this utility model are as follows: The wastewater treatment system of this invention first adds alkaline solution to precipitate insoluble solids, allowing the added flocculants such as PAM and PFS to form adsorption carriers based on the solids, thereby synergistically improving the removal rate of heavy metals. By treating ammonia nitrogen-containing wastewater with ammonia removal membrane, ammonia nitrogen in the wastewater can be removed to below 20 mg / L, reducing the treatment pressure of subsequent sewage treatment plants and also reducing energy consumption. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this utility model.

[0013] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of this utility model.

[0014] Figure 3 This is a schematic diagram of the structure of Embodiment 3 of this utility model. Detailed Implementation

[0015] The technical solution of this utility model will be clearly and completely described below with reference to its embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0016] Example 1

[0017] like Figure 1As shown, a copper anode mud smelting wastewater treatment system includes an acidic wastewater tank 7, a primary reaction tank 8, a primary product water storage tank 10, a secondary reaction tank 11, a secondary product water storage tank 12, an ammonia removal membrane system 13, and an ammonia removal product water tank 14, connected in sequence. The acidic wastewater in the acidic wastewater tank 7 is pumped to the primary reaction tank 8, where alkaline solution is added to adjust the pH value to 9-10, causing the heavy metals in the wastewater to react with the alkali to form insoluble solids. PAM and PFS are then added to cause the solids to flocculate and precipitate. The addition of alkali can remove heavy metals such as Cu, Ni, Zn, Fe, and Sn from the wastewater with a removal rate of over 95%. The supernatant is then sent to the primary product water storage tank 10.

[0018] In the above process, by first adding alkaline solution to precipitate insoluble solids, the added flocculants such as PAM and PFS can form adsorption carriers based on the solids, synergistically improving the removal rate of heavy metals, reducing the amount of subsequent heavy metal precipitating agents used, and lowering costs.

[0019] Furthermore, the bottom sludge in the primary reaction tank 8 is pumped to the filter press 9 (filtration area 60㎡, pressing pressure 0.8MPa, filter cake moisture content not higher than 75%) for filtration. The resulting sludge is sent to other workshops for treatment, and the filtrate flows into the primary product water storage tank 10.

[0020] Further, the wastewater from the primary product water storage tank 10 (10m³, fiberglass) is pumped into the secondary reaction tank 11. Sulfuric acid is added to adjust the pH to 5-6, and then heavy metal precipitating agent and PAM are added to further precipitate heavy metals (reducing the heavy metal content to below 5mg / L). The sediment in the secondary reaction tank 11 is pumped to the first filter press 9 for filtration, and the filtrate is sent to the primary product water storage tank 10. The supernatant in the secondary reaction tank 11 is sent to the secondary product water storage tank 12 and then pumped into the ammonia removal membrane system 13. Liquid alkali is added to adjust the pH to >10, and the temperature is controlled at 35-50℃ to reduce the NH4+ in the wastewater. + The ammonia is converted into free gaseous NH3, which passes through a polytetrafluoroethylene membrane and is absorbed by dilute sulfuric acid. The byproduct ammonium sulfate is sent to the pre-ammonia removal tank. After ammonia removal, the ammonia nitrogen in the wastewater is reduced to below 20 mg / L, eliminating any ammonia odor. Heavy metals are <0.1 mg / L, and the pH is <9. The final wastewater enters the ammonia removal product water tank 14 and is then sent to a wastewater treatment plant for further treatment. Because the ammonia nitrogen content in acidic wastewater is relatively low (e.g., 150 mg / L), using an ammonia removal membrane system effectively reduces energy consumption while meeting ammonia removal requirements.

[0021] Example 2

[0022] like Figure 2As shown, a copper anode mud smelting wastewater treatment system includes an alkaline wastewater tank 1, an equalization tank 2, a second filter press 3, a filter press filtration water tank 4, an ammonia stripping tower 5, and a heat exchanger 6 connected in sequence. The alkaline wastewater in the alkaline wastewater tank 1 is pumped to the equalization tank 2, where alkaline solution is added to adjust the pH to 9-10. After stirring for 1 hour, the heavy metals in the wastewater will react with the alkali to form precipitates. The mixture is then pressed in the second filter press 3 (filtration area 50㎡, pressing pressure 0.8MPa, filter cake moisture content not exceeding 75%). The resulting sludge is sent to other workshops for treatment. The filtrate is added to the filter press filtration water tank 4, where alkaline solution is added to adjust the pH to 11-12, and then pumped to the ammonia stripping tower 5 to remove OH-. - With NH4 + The reaction produces ammonia and water, which is beneficial for subsequent ammonia stripping. After ammonia stripping, the liquid ammonia nitrogen can be reduced to below 200 mg / L. The waste liquid is cooled and stored by heat exchanger 6 (plate type, heat exchange area 5㎡, material 316L).

[0023] In the above process, alkaline wastewater is pretreated by adding alkali before entering the ammonia stripping tower to reduce the heavy metal content in the alkaline wastewater, which can prevent scaling and clogging of the ammonia stripping tower and heat exchanger, and ensure the ammonia stripping and heat exchange effects.

[0024] Example 3

[0025] like Figure 3 As shown, a copper anode mud smelting wastewater treatment system is connected to the system of Example 2 before the acidic wastewater tank 7 of Example 1. This allows the wastewater from the ammonia stripping tower 5 of Example 2 to be cooled by a heat exchanger 6 (plate type, heat exchange area 5㎡, material 316L, capable of cooling to below 60℃) before being sent to the acidic wastewater tank 7 of Example 1 for treatment. Since the wastewater from the ammonia stripping tower 5 inevitably contains ammonia and has an alkaline pH, treatment with the acidic wastewater from Example 1 can directly neutralize it, reducing the amount of alkali solution used.

[0026] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A copper anode slime smelting wastewater treatment system, characterized by, The system includes an acidic wastewater tank (7), a primary reaction tank (8), a primary product water storage tank (10), a secondary reaction tank (11), a secondary product water storage tank (12), an ammonia removal membrane system (13), and an ammonia removal product water tank (14), which are connected in sequence. The acidic wastewater in the acidic wastewater tank (7) is pumped to the primary reaction tank (8) where alkaline solution is added to adjust the pH value and precipitate heavy metals. The supernatant is pumped to the primary product water storage tank (10) and then pumped into the secondary reaction tank (11) where acid solution is added to adjust the pH value and a heavy metal scavenger is added to further precipitate heavy metals. The supernatant is pumped to the secondary product water storage tank (12) and then pumped into the ammonia removal membrane system (13) for ammonia removal. After ammonia removal, the wastewater enters the ammonia removal product water tank (14).

2. A copper anode slime smelting wastewater treatment system as claimed in claim 1, wherein, The sediment settled in the primary reaction tank (8) is pumped to the first filter press (9) for filtration, and the filtrate is sent to the primary product water storage tank (10).

3. A copper anode slime smelting wastewater treatment system as claimed in claim 1, wherein, The sediment settled in the secondary reaction tank (11) is pumped to the first filter press (9) for filtration, and the filtrate is sent to the primary product water storage tank (10).

4. A copper anode slime smelting effluent treatment system as claimed in claim 1 wherein, It also includes an alkaline wastewater tank (1), an adjusting tank (2), a second filter press (3), a filter press water tank (4), and an ammonia stripping tower (5) connected in sequence. The alkaline wastewater in the alkaline wastewater tank (1) is pumped to the adjusting tank (2) to add alkaline solution to adjust the pH value and precipitate heavy metals. The mixture is then filtered by the second filter press (3), and the filtrate is then added to the filter press water tank (4) to add alkaline solution to adjust the pH value and pumped to the ammonia stripping tower (5) to strip ammonia.

5. A copper anode slime smelting wastewater treatment system as claimed in claim 4, wherein, The ammonia stripping tower (5) is also connected to an acidic wastewater tank (7). The wastewater after ammonia stripping in the ammonia stripping tower (5) is cooled by a heat exchanger (6) and then enters the acidic wastewater tank (7).

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