Treatment device for automatically recycling low-concentration copper

Abstract

The utility model discloses a treatment device for automatically recycling low-concentration copper. The treatment device comprises a coagulation and flocculation tank, a first rapid sedimentation tank, an aeration tank, a rapid sedimentation tank, a sludge centrifugal machine and the like. According to the mode, the treatment device for automatically recycling the low-concentration copper has the advantages that the trapping agent and copper ions form sediment substances under the acidic condition, and the sediment substances are dissolved under the alkaline condition and synchronously generate copper hydroxide sediment; according to the method, copper and other impurities are effectively separated under the acidic condition, copper ions are purified under the alkaline condition, copper is recycled in the form of copper hydroxide, the anti-interference capacity is improved, the purity of the obtained copper hydroxide is effectively improved, the comprehensive recovery rate of copper reaches 92% or above, and the method is suitable for industrial production. Meanwhile, secondary precipitation and cyclic utilization of the copper ion trapping agent can be achieved, and the method is more environmentally friendly and economical.

Description

Technical Field

[0001] The utility model relates to the technical field of waste liquid treatment equipment, in particular to a treatment device for automatically recovering low-concentration copper. Background Art

[0002] In the electronics, chemical and other industrial fields, a large amount of waste liquid containing copper ions is generated. If the waste liquid is not treated, it will cause very serious impact and damage to the environment and also cause waste of resources.

[0003] However, with the increasing environmental awareness of society and enterprises in recent years, the current waste liquid treatment equipment and methods are unable to effectively treat waste liquid containing low-concentration copper, that is, the efficiency and effect of copper ion separation and purification are very unsatisfactory, and the reagents used for separation and purification cannot be recycled and reused, which is not conducive to the control of treatment costs. Therefore, a treatment device that can better meet the needs is needed. Utility Model Content

[0004] In order to solve the above technical problems, a technical solution adopted by the present invention is:

[0005] Provided is a processing device for automatically recovering low-concentration copper, which includes: a coagulation and flocculation tank, a first rapid sedimentation tank, an aeration tank, a rapid sedimentation tank, a sludge centrifuge, a first pH adjustment tank, a second pH adjustment tank, a waste liquid input pipeline, a capture agent dosing pipeline, a capture agent recycling pipeline, a first mud and water gravity pipeline, a first mud and water lifting pipeline, an acid and alkali dosing pipeline, a second mud and water gravity pipeline, a second mud and water lifting pipeline, a centrifuge slag outlet, and a centrifuge liquid recycling pipeline.

[0006] The first pH regulating tank is provided at the upper part of the coagulation and flocculation tank, and the second pH regulating tank is provided at the upper part of the aeration tank. The waste liquid input pipe is connected to the first pH regulating tank, and its end extends to the bottom of the first pH regulating tank to input the waste liquid to be treated into the first pH regulating tank. The first pH regulating tank and the second pH regulating tank are connected to the acid and alkali dosing pipe with the end extending to the bottom of the tank. The coagulation and flocculation tank is connected to the first pH regulating tank so that the wastewater in the first pH regulating tank overflows into the coagulation and flocculation tank. The capture agent dosing pipe extends to the bottom of the coagulation and flocculation tank to transport the copper ion capture agent to the coagulation and flocculation tank. One or more groups of aerators are provided at the bottom of the coagulation and flocculation tank and the aeration tank.

[0007] One end of the first muddy water gravity pipe is connected to the upper part of the coagulation and flocculation tank, and the other end extends into the first rapid sedimentation tank to deliver the muddy water mixture containing copper precipitation material to the first rapid sedimentation tank. The first muddy water lifting pipe is respectively connected to the first rapid sedimentation tank and the second pH adjustment tank to deliver the muddy water mixture located at the lower part of the first rapid sedimentation tank to the second pH adjustment tank. The aeration tank is connected to the second pH adjustment tank so that the muddy water mixture in the second pH adjustment tank overflows into the aeration tank. One end of the second muddy water gravity pipe is connected to the upper part of the aeration tank. , the other end extends to the lower part of the second rapid sedimentation tank to send the mud-water mixture in the aeration tank to the second rapid sedimentation tank, one end of the second mud-water lifting pipe is connected to the bottom outlet of the second rapid sedimentation tank, and the other end is connected to the sludge centrifuge, and the sludge centrifuge is provided with a centrifuge slag discharge hole, the input end of the centrifuge recycling pipe is respectively connected to the sludge centrifuge and the second rapid sedimentation tank, and the output end is connected to the coagulation and flocculation tank to lift the centrifuge separated by the sludge centrifuge and the supernatant above the second rapid sedimentation tank back to the coagulation and flocculation tank for recycling.

[0008] In a preferred embodiment of the present invention, the copper ion capture agent includes one or more of oxalic acid, sodium oxalate or oxalic acid derivatives, and the pH of the copper ion capture agent is 3-5.

[0009] In a preferred embodiment of the present invention, the aeration tank is connected to an inlet and outlet pipe for conveying the alkaline solvent.

[0010] In a preferred embodiment of the present invention, the top opening of the first pH regulating tank is directly connected to the coagulation and flocculation tank, or the first pH regulating tank is connected to the coagulation and flocculation tank through an overflow pipe.

[0011] In a preferred embodiment of the present invention, aerators are provided at the bottom of the first pH adjustment tank and the second pH adjustment tank.

[0012] In a preferred embodiment of the present invention, the acidic pH adjusting agent includes sulfuric acid, nitric acid, hydrochloric acid or a mixed acid thereof, and the alkaline pH adjusting agent includes sodium hydroxide or potassium hydroxide.

[0013] In a preferred embodiment of the present invention, the water inlet end of the first mud and water lifting pipe is arranged at the bottom of the first rapid sedimentation tank, and the water outlet end thereof is connected to the second pH adjustment tank.

[0014] In a preferred embodiment of the present invention, the first muddy water gravity pipe extends to above the water inlet end of the first muddy water lifting pipe.

[0015] In a preferred embodiment of the present invention, the water outlet end of the first muddy water lifting pipe extends to the bottom of the second pH regulating tank.

[0016] In a preferred embodiment of the present invention, valve bodies are provided at the bottom outlets of the first rapid sedimentation tank and the second rapid sedimentation tank.

[0017] The beneficial effects of the utility model are as follows: utilizing the characteristics that the precipitate formed by the capture agent and copper ions under acidic conditions is dissolved under alkaline conditions and copper hydroxide precipitate is simultaneously generated, so that copper can be effectively separated from other impurities under acidic conditions and copper ions can be purified under alkaline conditions, so that copper can be recycled in the form of copper hydroxide, which not only improves the anti-interference ability and effectively improves the purity of the obtained copper hydroxide, but also achieves a comprehensive recovery rate of copper of more than 92%. At the same time, the secondary precipitation and recycling of the copper ion capture agent can be achieved, which is more environmentally friendly and economical. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. Among them:

[0019] Figure 1 The utility model is a structural schematic diagram of a preferred embodiment of an automatic processing device for recovering low-concentration copper. DETAILED DESCRIPTION

[0020] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] See also Figure 1 , the embodiments of the present utility model include:

[0022] A processing device for automatically recovering low-concentration copper is used to enrich and recycle waste liquid containing medium and low concentrations of copper ions. The device comprises: a coagulation and flocculation tank 1, a first rapid sedimentation tank 2, an aeration tank 3, a rapid sedimentation tank 4, a sludge centrifuge 5, a first pH adjustment tank 6, a second pH adjustment tank 7, a waste liquid input pipeline 8, a capture agent dosing pipeline 9, a capture agent recycling pipeline 10, a first mud and water gravity pipeline 11, a first mud and water lifting pipeline 12, an acid and alkali dosing pipeline 13, a second mud and water gravity pipeline 14, a second mud and water lifting pipeline 15, a centrifuge slag discharge hole 16, and a centrifuge liquid recycling pipeline 17.

[0023] The copper ion concentration in the wastewater must be no higher than 3000 mg / L, and the suspended solids (SS) content of the wastewater must be controlled below 20 mg / L, with a maximum value of below 10 mg / L. Furthermore, all components of the treatment system must undergo rigorous corrosion protection, ensuring a pH tolerance of 1-12.

[0024] The coagulation and flocculation tank 1, the first rapid sedimentation tank 2, the aeration tank 3, and the second rapid sedimentation tank 4 are arranged or connected in sequence. A first pH regulating tank 6 is provided at the upper part of the coagulation and flocculation tank 1, and a second pH regulating tank 7 is provided at the upper part of the aeration tank 3. The waste liquid input pipe 8 is connected to the first pH regulating tank 6, and its end extends to the bottom of the first pH regulating tank 6 to input the waste liquid to be treated into the first pH regulating tank 6. The first pH regulating tank 6 and the second pH regulating tank 7 are connected to an acid and alkali dosing pipe 13 with an end extending to the bottom of the tank to input acid and alkali neutralizing liquid into the pH regulating tank, thereby adjusting the pH value of the wastewater.

[0025] Further preferably, aerators are provided at the bottom of the first pH adjustment tank 6 and the second pH adjustment tank 7 .

[0026] More preferably, the acidic pH adjuster can be sulfuric acid, nitric acid, hydrochloric acid, or a mixture thereof, with sulfuric acid and nitric acid being particularly preferred. Although copper precipitates have a certain solubility under acidic conditions, particularly in the presence of hydrochloric acid, where their solubility is highest, the solubility is still less than 2 g / L. The alkaline pH adjuster can be sodium hydroxide or potassium hydroxide, with sodium hydroxide being the most preferred.

[0027] The coagulation and flocculation tank 1 is connected to the first pH adjustment tank 6 so that the wastewater with adjusted pH value in the first pH adjustment tank 6 can flow into the coagulation and flocculation tank 1 by overflow. One end of the capture agent dosing pipe 9 is connected to the copper ion capture agent storage device, and the other end extends to the bottom of the coagulation and flocculation tank 1 to transport the copper ion capture agent to the coagulation and flocculation tank 1 to react with the wastewater so that the copper ions form copper precipitation materials under acidic conditions. One or more aerators are provided at the bottom of the coagulation and flocculation tank 1 to promote the full reaction of the waste liquid and the copper ion capture agent.

[0028] More preferably, the copper ion capture agent includes one or more of oxalic acid, sodium oxalate or oxalic acid derivatives, and oxalic acid has the best effect.

[0029] More preferably, the pH of the copper ion capture agent is less than 5, and the pH value is preferably between 3-5.

[0030] Further preferably, the top opening of the first pH regulating tank 6 is directly connected to the coagulation and flocculation tank 1 , or the first pH regulating tank 6 is connected to the coagulation and flocculation tank 1 through an overflow pipe.

[0031] One end of the first muddy water gravity pipe 11 is connected to the upper portion of the coagulation and flocculation tank 1, and the other end extends into the first rapid sedimentation tank 2 to deliver the muddy water mixture containing copper precipitate to the first rapid sedimentation tank 2. The water inlet end of the first muddy water lifting pipe 12 is set at the bottom of the first rapid sedimentation tank 2, and its water outlet end is connected to the second pH adjustment tank 7 to deliver the muddy water mixture located at the bottom of the first rapid sedimentation tank 2 to the second pH adjustment tank 7. The aeration tank 3 is connected to the second pH adjustment tank 7 so that the muddy water mixture with adjusted pH value in the second pH adjustment tank 7 can flow into the aeration tank 3 filled with an alkaline solvent by overflow. The copper precipitate will dissolve under alkaline conditions and react with the alkaline solvent to form copper hydroxide precipitate, while releasing anions of the copper ion capture agent, allowing the capture agent to be regenerated under alkaline conditions. The alkaline condition refers to a pH greater than 8, and a pH value between 9 and 10 is particularly preferred. The alkaline solvent includes sodium hydroxide, potassium hydroxide, etc.

[0032] Further preferably, the first mud and water gravity pipe 11 extends to above the water inlet end of the first mud and water lifting pipe 12.

[0033] Further preferably, the water outlet end of the first mud and water lifting pipe 12 extends to the bottom of the second pH adjustment tank 7 .

[0034] Further preferably, the aeration tank is connected to an inlet and outlet pipe for conveying the alkaline solvent.

[0035] One end of the second mud and water gravity pipe 14 is connected to the upper part of the aeration tank, and the other end extends to the lower part of the second rapid sedimentation tank 4 to send the mud and water mixture in the aeration tank to the second rapid sedimentation tank 4. One end of the second mud and water lifting pipe 15 is connected to the bottom outlet of the second rapid sedimentation tank 4, and the other end is connected to the sludge centrifuge 5 to send the mixture containing a large amount of copper hydroxide precipitate to the sludge centrifuge 5 for centrifugal treatment to separate copper hydroxide, and output the separated copper hydroxide through the centrifuge slag outlet 16 on the sludge centrifuge 5. The input end of the centrifuge recycling pipe 17 is respectively connected to the sludge centrifuge 5 and the second rapid sedimentation tank 4, and its output end is connected to the coagulation and flocculation tank 1 to lift the centrifuge separated by the sludge centrifuge 5 and the supernatant above the second rapid sedimentation tank 2 back to the coagulation and flocculation tank 1 for recycling.

[0036] Further preferably, valve bodies are provided at the bottom outlets of the first rapid sedimentation tank 2 and the second rapid sedimentation tank 4 .

[0037] The specific processing steps include:

[0038] Step 1: The copper-containing wastewater is pretreated to control SS to below 10 mg / L. This can be achieved through equipment such as ultrafiltration and drum screens for fine SS removal.

[0039] Step 2: The pretreated wastewater enters the first pH adjustment tank 6 through the waste liquid input pipe 8 to control the pH of the wastewater to around 4, and then the wastewater automatically overflows into the coagulation and flocculation tank 1; wherein, the pH adjustment process is stirred by aeration at the bottom of the tank, and the hydraulic retention time of the first pH adjustment tank 6 is controlled at 10 minutes.

[0040] Step 3: Oxalic acid is added to the coagulation and flocculation tank 1 through the capture agent dosing pipe 9. The oxalic acid concentration is controlled at about 20 g / L, the reaction temperature is controlled to 45°C-50°C, and the reaction process is uniformly stirred by aeration at the bottom of the tank. The hydraulic retention time of the coagulation and flocculation tank 1 is controlled at 60 min.

[0041] The coagulation and flocculation tank 1 mainly adds a copper ion capture agent, but an acidity regulating agent can also be added during the reaction to control the reaction pH value.

[0042] Step 4: The mud-water mixture in the coagulation and flocculation tank 1 automatically overflows to the first rapid sedimentation tank 2 through the first mud-water gravity pipe 11, and the hydraulic retention time of the rapid sedimentation tank 1 is controlled at 15 minutes.

[0043] Step 5: The mud-water mixture in the first rapid sedimentation tank 2 is lifted to the second pH regulating tank 7 through the first mud-water lifting pipe 12 to control the pH to be around 10. The hydraulic retention time of the second pH regulating tank 7 is controlled to be 10 min.

[0044] Step 6: The mud-water mixture in the second pH adjustment tank 7 automatically overflows into the aeration tank 3, and the hydraulic retention time of the aeration tank 3 is controlled at 30 minutes.

[0045] Step 7: The mud-water mixture in the aeration tank 3 automatically overflows into the second rapid sedimentation tank 4 through the second mud-water gravity pipe 14, and the hydraulic retention time of the second rapid sedimentation tank 4 is controlled to 25 minutes.

[0046] Step 8: The sludge below the second rapid sedimentation tank 4 is lifted to the sludge centrifuge 5 through the second mud-water lifting pipe 15, the sludge is discharged from the centrifuge slag hole 16, and the centrifuge liquid is recycled to the coagulation and flocculation tank through the centrifuge liquid recycling pipe 17. The supernatant above the rapid sedimentation tank 2 is also lifted to the coagulation and flocculation tank 1 through the centrifuge liquid recycling pipe 17 for reuse.

[0047] Step 9: The hydraulic retention time of the whole process is controlled at 150 min.

[0048] After the treatment device is started normally, due to the loss of oxalic acid during the circulation process, the loss is about 1.2% in each cycle. Therefore, during normal operation, 1.2% oxalic acid can be added to the coagulation and flocculation tank 1 every 150 minutes.

[0049] The beneficial effect of the present invention's automated low-concentration copper recovery treatment device is as follows: utilizing the characteristic that the precipitate formed by oxalate and copper ions under acidic conditions can be dissolved under alkaline conditions and simultaneously generate copper hydroxide precipitate, the copper can be effectively separated from other impurities under acidic conditions and the copper ions can be purified under alkaline conditions, that is, the copper is ultimately recycled in the form of copper hydroxide, and at the same time, the secondary precipitation of oxalate (copper ion capture agent) can be achieved and reused. Compared with traditional chemical precipitation treatment equipment, the present application has a stronger anti-interference ability (i.e., interference from impurity ions), the purity of the obtained copper hydroxide is higher, which can reach more than 95%, and the comprehensive recovery rate of copper reaches more than 92%.

[0050] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A processing device for automatically recovering low-concentration copper, characterized in that: include: Coagulation and flocculation tank, first rapid sedimentation tank, aeration tank, second rapid sedimentation tank, sludge centrifuge, first pH regulating tank, second pH regulating tank, waste liquid input pipeline, capture agent dosing pipeline, capture agent recycling pipeline, first mud and water gravity pipeline, first mud and water lifting pipeline, acid and alkali dosing pipeline, second mud and water gravity pipeline, second mud and water lifting pipeline, centrifuge slag outlet, centrifuge liquid recycling pipeline, The first pH regulating tank is provided at the upper part of the coagulation and flocculation tank, and the second pH regulating tank is provided at the upper part of the aeration tank. The waste liquid input pipe is connected to the first pH regulating tank, and its end extends to the bottom of the first pH regulating tank to input the waste liquid to be treated into the first pH regulating tank. The first pH regulating tank and the second pH regulating tank are connected to the acid and alkali dosing pipe with the end extending to the bottom of the tank. The coagulation and flocculation tank is connected to the first pH regulating tank so that the wastewater in the first pH regulating tank overflows into the coagulation and flocculation tank. The capture agent dosing pipe extends to the bottom of the coagulation and flocculation tank to transport the copper ion capture agent to the coagulation and flocculation tank. One or more groups of aerators are provided at the bottom of the coagulation and flocculation tank and the aeration tank. One end of the first muddy water gravity pipe is connected to the upper part of the coagulation and flocculation tank, and the other end extends into the first rapid sedimentation tank to deliver the muddy water mixture containing copper precipitation material to the first rapid sedimentation tank. The first muddy water lifting pipe is respectively connected to the first rapid sedimentation tank and the second pH adjustment tank to deliver the muddy water mixture located at the lower part of the first rapid sedimentation tank to the second pH adjustment tank. The aeration tank is connected to the second pH adjustment tank so that the muddy water mixture in the second pH adjustment tank overflows into the aeration tank filled with alkaline solvent. One end of the second muddy water gravity pipe is connected to the upper part of the aeration tank. The second rapid sedimentation tank is connected to the aeration tank, and the other end extends to the lower part of the second rapid sedimentation tank to deliver the mud-water mixture in the aeration tank to the second rapid sedimentation tank. One end of the second mud-water lifting pipe is connected to the bottom outlet of the second rapid sedimentation tank, and the other end is connected to the sludge centrifuge, and the sludge centrifuge is provided with a centrifuge slag discharge hole. The input end of the centrifuge recycling pipe is respectively connected to the sludge centrifuge and the second rapid sedimentation tank, and the output end is connected to the coagulation and flocculation tank to lift the centrifuge separated by the sludge centrifuge and the supernatant above the second rapid sedimentation tank back to the coagulation and flocculation tank for recycling.

2. The automated low-concentration copper recovery processing device according to claim 1, characterized in that: The copper ion capture agent includes one of oxalic acid, sodium oxalate or an oxalic acid derivative, and the pH of the copper ion capture agent is 3-5.

3. The automated low-concentration copper recovery processing device according to claim 1, characterized in that: The aeration tank is connected with an inlet and outlet pipe for conveying alkaline solvent.

4. The automated low-concentration copper recovery processing device according to claim 1, characterized in that: The top opening of the first pH regulating tank is directly connected to the coagulation and flocculation tank, or the first pH regulating tank is connected to the coagulation and flocculation tank through an overflow pipe.

5. The automated low-concentration copper recovery processing device according to claim 1, characterized in that: Aerators are provided at the bottom of the first pH adjustment tank and the second pH adjustment tank.

6. The automated low-concentration copper recovery processing device according to claim 1, characterized in that: Acidic pH adjusters include sulfuric acid, nitric acid, or hydrochloric acid, and alkaline pH adjusters include sodium hydroxide or potassium hydroxide.

7. The automated low-concentration copper recovery processing device according to claim 1, characterized in that: The water inlet end of the first mud and water lifting pipe is arranged at the bottom of the first rapid sedimentation tank, and the water outlet end thereof is connected to the second pH regulating tank.

8. The automated low-concentration copper recovery processing device according to claim 1, characterized in that: The first mud and water gravity pipe extends to above the water inlet end of the first mud and water lifting pipe.

9. The automated low-concentration copper recovery processing device according to claim 1, characterized in that: The water outlet end of the first muddy water lifting pipe extends to the bottom of the second pH regulating tank.

10. The automated low-concentration copper recovery processing device according to claim 1, characterized in that: A valve body is provided at the bottom outlet of each of the first rapid sedimentation tank and the second rapid sedimentation tank.

Images