Copper-containing waste liquid copper recovery system

Abstract

The utility model discloses a copper recovery system for copper-containing waste liquid. The copper recovery system comprises a storage part and a separation part, the material storage part comprises a waste liquid tank, a liquid caustic soda tank and a reaction tank; the waste liquid tank and the liquid caustic soda tank are respectively communicated with the reaction tank; the separation part comprises a main filter press, a replacement tank, a flocculation basin, a first valve and a second valve, an inlet end of the main filter press is respectively communicated with a liquid outlet of the replacement tank and the reaction tank, a waste liquid end of the main filter press is respectively communicated with a liquid inlet of the replacement tank and the flocculation basin, and the first valve is arranged on a connecting pipeline of the waste liquid end of the main filter press and the liquid inlet; and the second valve is arranged on a connecting pipeline of the waste liquid end of the main filter press and the flocculation basin. According to the scheme, high heat does not need to be continuously provided, energy consumption is reduced, the copper removal speed is high, and the recovery efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of acidic copper-containing waste liquid treatment, in particular to a copper recovery system for copper-containing waste liquid. Background Art

[0002] Acidic copper-containing waste liquid is collected from hazardous waste generating enterprises to the factory, and then transferred to the waste liquid storage area for storage, and then decopperized in batches. For example, patent CN 216614323 U discloses a copper-containing waste liquid recovery and treatment system, which connects an evaporation device with a collection device to distill out the water in the copper-containing waste liquid to obtain a crude copper sulfate pentahydrate product and condensed water, and then connects the evaporation device through a condensed water recovery device to recover the condensed water, thereby realizing the recovery and treatment of the copper-containing waste liquid.

[0003] However, the patent uses an evaporator to evaporate the water in the copper-containing solution, which requires continuous supply of high heat and relatively high energy consumption. At the same time, the evaporation and crystallization process is relatively slow, and the recovery efficiency needs to be improved. Utility Model Content

[0004] The utility model aims to overcome the above technical deficiencies and propose a copper recovery system for copper-containing waste liquid, so as to solve the technical problems in the prior art of evaporating water in a copper-containing solution by means of an evaporator, which requires continuous supply of high heat, has relatively high energy consumption, and the evaporation and crystallization process is relatively slow, and the recovery efficiency needs to be improved.

[0005] In order to achieve the above technical purpose, the utility model adopts the following technical solutions:

[0006] The utility model provides a copper recovery system for copper-containing waste liquid, comprising:

[0007] A material storage part, including a waste liquid tank, a liquid alkali tank and a reaction tank, wherein the waste liquid tank and the liquid alkali tank are respectively connected to the reaction tank; and

[0008] The separation part includes a main filter press, a displacement tank, a flocculation tank, a first valve and a second valve. The inlet end of the main filter press is respectively connected to the liquid outlet of the displacement tank and the reaction tank, and its waste liquid end is respectively connected to the liquid inlet of the displacement tank and the flocculation tank. The first valve is arranged on the connecting pipeline between the waste liquid end of the main filter press and the liquid inlet, and the second valve is arranged on the connecting pipeline between the waste liquid end of the main filter press and the flocculation tank.

[0009] In some embodiments, the separation part further includes a filter press main pipe, a first filter press branch pipe and a second filter press branch pipe, one end of the filter press main pipe is connected to the waste liquid end, and the other end is connected to the first filter press branch pipe and the second filter press branch pipe, the first filter press branch pipe is connected to the liquid inlet, and the second filter press branch pipe is connected to the flocculation tank;

[0010] Wherein, the first valve is arranged on the first filter press branch pipe, and the second valve is arranged on the second filter press branch pipe.

[0011] In some embodiments, the material storage part further includes a stirrer, and a stirring blade of the stirrer is placed in the reaction tank.

[0012] In some embodiments, the material storage section further includes a heating section, and the heating section is disposed in the reaction tank.

[0013] In some embodiments, the copper recovery system for copper-containing waste liquid also includes a transfer tank, and the reaction tank, the transfer tank and the inlet end are connected in sequence.

[0014] In some embodiments, a plurality of partitions are arranged in the transfer pool along the solution flow direction, and the plurality of partitions divide the transfer pool into a plurality of buffer pools. Each of the partitions is provided with a through hole connecting two adjacent buffer pools, and the plurality of through holes are alternately arranged up and down along the solution flow direction.

[0015] In some embodiments, the reaction tank is connected to the bottom of the transfer tank, and a buffer plate is also provided at the bottom of the transfer tank. The buffer plate is spaced apart beside the connecting portion between the reaction tank and the transfer tank, and is spaced apart from the adjacent partition along the solution flow direction.

[0016] In some embodiments, the separation unit further includes an auxiliary filter press, the inlet end of the auxiliary filter press is respectively connected to the bottom of the plurality of buffer tanks, and the waste liquid end thereof is connected to the reaction tank.

[0017] In some embodiments, the inlet end of the main filter press is connected to the buffer tank located at the end of the solution flow direction, and is connected to the top of the buffer tank, and the through hole located at the end of the solution flow direction is arranged at the bottom of the transfer tank.

[0018] In some embodiments, a high-position tank is provided on the connecting pipeline between the waste liquid tank and the reaction tank, and / or a high-position tank is provided on the connecting pipeline between the liquid alkali tank and the reaction tank.

[0019] Compared with the prior art, the utility model provides a copper recovery system for copper-containing waste liquid, wherein the copper-containing waste liquid in the waste liquid tank and the liquid alkali in the liquid alkali tank are transported to the reaction tank in a predetermined ratio, so that the pH value in the reaction tank is controlled at about 8.5-9, and most of the copper chloride in the reaction tank is converted into precipitated copper hydroxide, and then the solution in the reaction tank is transported to the main filter press, and at the same time, the first valve is opened and the second valve is closed, the main filter press performs filter pressing on the solution transported by the reaction tank, and the filter cake after the filter pressing is taken out from the filter cake outlet of the filter press, and the waste liquid after the filter pressing first enters the displacement tank, and undergoes a displacement reaction with the iron powder in the displacement tank to displace the copper ions in the solution, and the waste liquid after the displacement in the displacement tank is then transported to the inlet end of the main filter press for filter pressing, and the waste liquid circulates between the main filter press and the displacement tank until the copper ion content of the waste liquid in the displacement tank meets the standard, and then the first valve is closed and the second valve is opened, and the solution after the filter pressing by the main filter press is transported to the flocculation tank for final purification, and the water can be drained after the purification is completed. In this way, there is no need to continuously provide high heat, which reduces energy consumption, and the copper removal speed is fast and the recovery efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of a copper recovery system for copper-containing waste liquid provided by an embodiment of the utility model;

[0021] Figure 2 yes Figure 1 Schematic diagram of the middle separation section;

[0022] Figure 3 yes Figure 1 Schematic diagram of the middle storage section;

[0023] Figure 4 yes Figure 1 Schematic diagram of the intermediate reaction tank, transfer tank and main filter press.

[0024] Description of reference numerals:

[0025] 1. Waste liquid tank; 2. Liquid alkali tank; 3. Reaction tank; 31. Agitator; 32. Heating unit; 4. Main filter press; 41. First valve; 42. Second valve; 43. Filter press main pipe; 44. First filter press branch pipe; 45. Second filter press branch pipe; 5. Displacement tank; 6. Flocculation tank; 7. Transfer tank; 71. Partition; 71a. Through hole; 72. Buffer tank; 73. Buffer plate; 74. Additive tank; 8. Auxiliary filter press; 9. High-level tank. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0027] In order to solve the technical problems that evaporating water in a copper-containing solution by means of an evaporator requires continuous supply of high heat, the energy consumption is relatively high, the evaporation and crystallization process is relatively slow, and the recovery efficiency needs to be improved, the utility model provides a copper recovery system for copper-containing waste liquid, which does not require continuous supply of high heat, reduces energy consumption, has a fast copper removal speed, and has a high recovery efficiency.

[0028] See also Figure 1 , Figure 1 It is a structural schematic diagram of a copper recovery system for copper-containing waste liquid in one embodiment of the utility model, and the copper recovery system for copper-containing waste liquid includes a storage part and a separation part; the storage part includes a waste liquid tank 1, a liquid alkali tank 2 and a reaction tank 3, and the waste liquid tank 1 and the liquid alkali tank 2 are respectively connected to the reaction tank 3; the separation part includes a main filter press 4, a displacement tank 5, a flocculation tank 6, a first valve 41 and a second valve 42, the inlet end of the main filter press 4 is respectively connected to the liquid outlet of the displacement tank 5 and the reaction tank 3, and its waste liquid end is respectively connected to the liquid inlet of the displacement tank 5 and the flocculation tank 6, the first valve 41 is arranged on the connecting pipeline between the waste liquid end and the liquid inlet of the main filter press 4, and the second valve 42 is arranged on the connecting pipeline between the waste liquid end of the main filter press 4 and the flocculation tank 6.

[0029] In the copper recovery system of copper-containing waste liquid provided by the utility model, the copper-containing waste liquid in the waste liquid tank 1 and the liquid alkali in the liquid alkali tank 2 are transported to the reaction tank 3 according to a predetermined ratio, so that the pH value in the reaction tank 3 is controlled at about 8.5-9, and most of the copper chloride in the reaction tank 3 is converted into precipitated copper hydroxide, and then the solution in the reaction tank 3 is transported to the main filter press 4, and the first valve 41 is opened and the second valve 42 is closed at the same time, and the main filter press 4 filters the solution transported by the reaction tank 3, and the filter cake after the filtration is discharged from the filter press filter cake The waste liquid after the filter press first enters the displacement tank 5, and undergoes a displacement reaction with the iron powder in the displacement tank 5 to displace the copper ions in the solution. The replaced waste liquid in the displacement tank 5 is then transported to the inlet end of the main filter press 4 for filter press. The waste liquid circulates between the main filter press 4 and the displacement tank 5 until the copper ion content of the waste liquid in the displacement tank 5 meets the standard. Then the first valve 41 is closed and the second valve 42 is opened, and the solution after the filter press of the main filter press 4 is transported to the flocculation tank 6 for final purification. After the purification is completed, the water can be drained. In this way, there is no need to continuously provide high heat, which reduces energy consumption, and the copper removal speed is fast, and the recovery efficiency is high.

[0030] It should be noted that, in the present embodiment, the flocculation tank 6 is also provided with a plurality of additive tanks 74 , which are used to store sodium hydroxide, heavy metals, PAC (polyaluminium chloride) and PAM (polyacrylamide flocculant) and the like.

[0031] In one embodiment, see Figure 2The separation part also includes a filter press main pipe 43, a first filter press branch pipe 44 and a second filter press branch pipe 45. One end of the filter press main pipe 43 is connected to the waste liquid end, and the other end is connected to the first filter press branch pipe 44 and the second filter press branch pipe 45. The first filter press branch pipe 44 is connected to the liquid inlet, and the second filter press branch pipe 45 is connected to the flocculation tank 6; wherein the first valve 41 is arranged on the first filter press branch pipe 44, and the second valve 42 is arranged on the second filter press branch pipe 45.

[0032] In this embodiment, the main filter press 4, the displacement tank 5 and the flocculation tank 6 are connected through the filter press main pipe 43, the first filter press branch pipe 44 and the second filter press branch pipe 45, and the first valve 41 and the second valve 42 respectively control the opening and closing of the first filter press branch pipe 44 and the second filter press branch pipe 45.

[0033] In one embodiment, see Figure 3 The material storage part further includes a stirrer 31, and the stirring blades of the stirrer 31 are placed in the reaction tank 3. The material storage part further includes a heating part 32, and the heating part 32 is placed in the reaction tank 3.

[0034] In the present embodiment, the solution in the reaction tank 3 is stirred by the stirrer 31, and the solution in the reaction tank 3 is heated by the heating unit 32 to increase the reaction rate. Specifically, when the copper-containing waste liquid and the sodium hydroxide solution are transported to the reaction tank 3 in proportion, the stirrer 31 and the heating unit 32 are turned on, the hydrochloric acid in the acidic copper-containing waste liquid is stirred and the copper ions in the copper-containing waste water are precipitated by sodium hydroxide to generate a precipitation of copper hydroxide and heated to a certain temperature at the same time. It should be noted that the heating unit 32 is an acid and alkali resistant heater, and the specific structure and principle are prior art, which will not be repeated here.

[0035] Finally, the pH value in the reaction tank 3 is controlled at about 8.5 to 9. At this time, most of the copper chloride is converted into precipitated copper hydroxide and then decomposed into copper oxide. When the copper chloride content in the waste liquid is 0.1% to 0.2%, this step is considered to be completed. The relevant chemical reaction equation is as follows.

[0036] HCl+NaOH = NaCl+H2O;

[0037] CuCl2+2NaOH = Cu(OH)2+2NaCl.

[0038] The wastewater obtained after the initial filtration still contains a small amount of copper. When preparing sponge copper, the wastewater is pumped into the displacement tank 5, and an excess of iron powder is added to the displacement tank 5 to displace the copper therein. After filtration, the solid part is sponge copper. Reaction process: Cu 2+ +Fe = Fe 2+ +Cu.

[0039] In one embodiment, the copper recovery system for copper-containing waste liquid further includes a transfer tank 7, and the reaction tank 3, the transfer tank 7 and the inlet end are connected in sequence.

[0040] In this embodiment, a transfer tank 7 is further provided between the reaction tank 3 and the filter press so as to reasonably adjust the reaction rate and enable the solution in the transfer tank 7 to continue to react, thereby improving the purification quality.

[0041] In one embodiment, see Figure 4 A plurality of partitions 71 are arranged in the transfer pool 7 along the flow direction of the solution. The plurality of partitions 71 divide the transfer pool 7 into a plurality of buffer pools 72. Each partition 71 is provided with a through hole 71a connecting two adjacent buffer pools 72. The plurality of through holes 71a are alternately arranged up and down along the flow direction of the solution.

[0042] In this embodiment, multiple partitions 71 are provided to form a buffer tank 72 to reduce the disturbance of the flow rate to the solution and achieve preliminary separation of the precipitate and water. Multiple through holes 71a are alternately arranged in the up and down directions to increase the flow distance of the solution and improve the separation efficiency.

[0043] In one embodiment, the reaction tank 3 is connected to the bottom of the transfer tank 7, and a buffer plate 73 is also provided at the bottom of the transfer tank 7. The buffer plate 73 is spaced apart beside the connecting portion between the reaction tank 3 and the transfer tank 7, and is spaced apart from the adjacent partition plate 71 along the solution flow direction.

[0044] In this embodiment, a buffer plate 73 is also provided at the connection part between the reaction tank 3 and the transfer tank 7 to further reduce the disturbance effect of the input flow rate on the solution in the transfer tank 7. It should be noted that a pump body is provided on the connecting pipeline between the waste liquid tank 1 and the reaction tank 3. Similarly, a pump body can also be provided on the connecting pipeline between the liquid alkali tank 2 and the reaction tank 3, and pump bodies can also be provided on other pipelines.

[0045] In one embodiment, the separation part further includes an auxiliary filter press 8 , the inlet end of the auxiliary filter press 8 is connected to the bottom of a plurality of buffer tanks 72 , and the waste liquid end thereof is connected to the reaction tank 3 .

[0046] In this embodiment, an auxiliary filter press 8 is also provided to filter the copper-containing precipitate precipitated at the bottom of the transfer tank 7 in time to ensure the storage capacity of the transfer tank 7 and improve the processing efficiency. The wastewater filtered by the auxiliary filter press 8 is circulated to the reaction tank 3 to ensure the purification quality.

[0047] In one embodiment, the inlet end of the main filter press 4 is connected to the buffer tank 72 located at the end of the solution flow direction, and is connected to the top of the buffer tank 72, and the through hole 71a located at the end of the solution flow direction is provided at the bottom of the transfer tank 7.

[0048] In this embodiment, the main filter press 4 is connected to the top of the terminal buffer tank 72 to shorten the cycle of the main filter press 4 and the displacement tank 5, and cooperates with the auxiliary filter press 8 to ensure the purification quality while accelerating the purification efficiency of the wastewater.

[0049] In one embodiment, a high-level tank 9 is provided on the connecting pipeline between the waste liquid tank 1 and the reaction tank 3 , and a high-level tank 9 is provided on the connecting pipeline between the liquid alkali tank 2 and the reaction tank 3 .

[0050] In this embodiment, a high-level tank 9 is provided to homogenize the copper-containing waste liquid and the sodium hydroxide solution transported to the reaction tank 3 in advance, thereby further improving the reaction rate. The specific structure and principle of the high-level tank 9 are prior art and will not be described in detail herein.

[0051] In order to better understand the present invention, the following Figures 1 to 4 The technical solution of the utility model is described in detail:

[0052] The copper-containing waste liquid in the waste liquid tank 1 and the liquid alkali in the liquid alkali tank 2 are transported to the reaction tank 3 in a predetermined ratio, so that the pH value in the reaction tank 3 is controlled at about 8.5-9, and most of the copper chloride in the reaction tank 3 is converted into precipitated copper hydroxide, and then the solution in the reaction tank 3 is transported to the transfer tank 7.

[0053] The upper layer solution in the transfer tank 7 is transported to the main filter press 4. At the same time, the first valve 41 is opened and the second valve 42 is closed. The main filter press 4 filters the solution transported by the reaction tank 3. The filter cake after filtration is taken out from the filter cake outlet of the filter press. The waste liquid after filtration first enters the displacement tank 5, and undergoes a displacement reaction with the iron powder in the displacement tank 5 to displace the copper ions in the solution. The replaced waste liquid in the displacement tank 5 is then transported to the inlet end of the main filter press 4 for filtration. The waste liquid circulates between the main filter press 4 and the displacement tank 5 until the copper ion content of the waste liquid in the displacement tank 5 meets the standard. Then the first valve 41 is closed and the second valve 42 is opened, and the solution after filtration by the main filter press 4 is transported to the flocculation tank 6 for final purification. After purification, the water can be discharged.

[0054] The bottom solution in the transfer tank 7 is transported to the auxiliary filter press 8, which timely filters the copper-containing precipitate at the bottom of the transfer tank 7, and transports the waste liquid after filtration to the reaction tank 3 for circulation. The main filter press 4 and the auxiliary filter press 8 cooperate to improve the filtration efficiency and effectively ensure that the copper ions in the purified solution meet the standards. In this way, there is no need to continuously provide high heat, reduce energy consumption, and remove copper quickly, with high recovery efficiency.

[0055] The specific implementation methods of the utility model described above do not constitute a limitation on the protection scope of the utility model. Any other corresponding changes and modifications made according to the technical concept of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A copper recovery system for copper-containing waste liquid, characterized in that: include: A material storage part, including a waste liquid tank, a liquid alkali tank and a reaction tank, wherein the waste liquid tank and the liquid alkali tank are respectively connected to the reaction tank; and The separation part includes a main filter press, a displacement tank, a flocculation tank, a first valve and a second valve. The inlet end of the main filter press is respectively connected to the liquid outlet of the displacement tank and the reaction tank, and its waste liquid end is respectively connected to the liquid inlet of the displacement tank and the flocculation tank. The first valve is arranged on the connecting pipeline between the waste liquid end of the main filter press and the liquid inlet, and the second valve is arranged on the connecting pipeline between the waste liquid end of the main filter press and the flocculation tank.

2. The copper recovery system for copper-containing waste liquid according to claim 1, characterized in that: The separation part further comprises a filter press main pipe, a first filter press branch pipe and a second filter press branch pipe, one end of the filter press main pipe is connected to the waste liquid end, and the other end is connected to the first filter press branch pipe and the second filter press branch pipe, the first filter press branch pipe is connected to the liquid inlet, and the second filter press branch pipe is connected to the flocculation tank; Wherein, the first valve is arranged on the first filter press branch pipe, and the second valve is arranged on the second filter press branch pipe.

3. The copper recovery system for copper-containing waste liquid according to claim 1, characterized in that: The material storage part also includes a stirrer, and a stirring blade of the stirrer is placed in the reaction tank.

4. The copper recovery system for copper-containing waste liquid according to any one of claims 1 to 3, characterized in that: The material storage part also includes a heating part, and the heating part is placed in the reaction tank.

5. The copper recovery system for copper-containing waste liquid according to claim 1, characterized in that: The copper recovery system for copper-containing waste liquid also includes a transfer tank, and the reaction tank, the transfer tank and the inlet end are connected in sequence.

6. The copper recovery system for copper-containing waste liquid according to claim 5, characterized in that: A plurality of partitions are arranged in the transfer pool along the flow direction of the solution, and the plurality of partitions divide the transfer pool into a plurality of buffer pools. Each of the partitions is provided with a through hole connecting two adjacent buffer pools, and the plurality of through holes are alternately arranged up and down along the flow direction of the solution.

7. The copper recovery system for copper-containing waste liquid according to claim 6, characterized in that: The reaction tank is connected to the bottom of the transfer tank, and a buffer plate is also provided at the bottom of the transfer tank. The buffer plate is spaced apart beside the connecting portion between the reaction tank and the transfer tank, and is spaced apart from the adjacent partition along the solution flow direction.

8. The copper recovery system for copper-containing waste liquid according to claim 6, characterized in that: The separation part further comprises an auxiliary filter press, the inlet end of the auxiliary filter press is respectively connected to the bottom of the plurality of buffer tanks, and the waste liquid end thereof is connected to the reaction tank.

9. The copper recovery system for copper-containing waste liquid according to claim 6, characterized in that: The inlet end of the main filter press is connected to the buffer tank located at the end of the solution flow direction and is connected to the top of the buffer tank, and the through hole located at the end of the solution flow direction is arranged at the bottom of the transfer tank.

10. The copper recovery system for copper-containing waste liquid according to claim 1, characterized in that: A high-position tank is provided on the connecting pipeline between the waste liquid tank and the reaction tank, and / or a high-position tank is provided on the connecting pipeline between the liquid alkali tank and the reaction tank.

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