Composite treatment device beneficial to copper recovery from low-concentration copper-containing wastewater

Abstract

The utility model discloses a composite treatment device beneficial to copper recovery from low-concentration copper-containing wastewater, which relates to the technical field of copper recovery and comprises a device body. The device body is composed of resin adsorption equipment, electrodeposition copper extraction equipment and nanofiltration concentration equipment, the resin adsorption equipment comprises a resin tank, a resin cleaning water tank, a regeneration agent tank, a nanofiltration permeate liquid tank and a trench, and a copper ion adsorption pipeline, a resin cleaning pipeline, a resin regeneration pipeline and a liquid emptying pipeline are arranged in the resin tank. According to the utility model, the occupied area of the membrane is reduced, and the investment cost of the membrane is reduced; a sulfuric acid solution meeting the requirements of a resin regeneration solution is obtained on the acid-resistant nanofiltration permeate liquid side, sulfuric acid is recycled, and the acid-resistant nanofiltration is adopted to treat the electrodeposition clear liquid, so that copper in the electrodeposition clear liquid can be further concentrated to meet the requirements of the electrodeposition inlet liquid concentration; therefore, the copper in the electrodeposition clear liquid is further recovered, and the recovery rate of the copper is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of copper recovery, in particular to a composite treatment device which is beneficial for recovering copper from low-concentration copper-containing wastewater. Background Art

[0002] Copper is a type of pollutant that is strictly controlled by the country. It is also a metal with a high recycling value. For low-concentration copper-containing wastewater, there are two common response methods: one is treatment method and the other is resource recovery method.

[0003] The treatment method is usually to discharge the wastewater directly into the sewage treatment plant, and through the physical and chemical precipitation process, the copper ions in the water are sunk into the sludge, and then the sludge is treated as hazardous waste. This method not only has high operating costs, but also causes a large amount of copper resources to be wasted.

[0004] There are two main resource recovery methods: ① membrane concentration + electrolysis; ② resin enrichment + electrolysis. Although both methods can recycle copper-containing wastewater, they each have their own disadvantages that cannot be ignored:

[0005] Regarding the "membrane concentration + electrolytic deposition" process. This method uses a membrane to directly concentrate copper-containing wastewater. Because the amount of copper-containing wastewater is relatively large and acidic, it is necessary to use an expensive acid-resistant membrane, and the membrane usage is large, resulting in a relatively high overall investment; the membrane concentrate will contain impurities brought by the raw water, which will affect the quality and efficiency of electrolytic copper; the remaining copper in the electrolytic clear liquid cannot be fully extracted, resulting in a waste of resources; the electrolytic clear liquid can often only be treated by adding alkali to adjust the pH for physical and chemical precipitation, which increases the cost of reagents and sludge disposal.

[0006] Regarding the "resin enrichment + electrolytic deposition" process. This method uses resin for single-stage enrichment, and the enrichment concentration of its regenerated liquid is often lower than the inlet concentration recommended by the electrolytic deposition process, resulting in low electrolytic deposition efficiency; the resin regeneration liquid is generally 5% to 10% sulfuric acid. If the electrolytic clear liquid after copper extraction is directly treated by adding alkali to adjust the pH for physical and chemical precipitation, in addition to causing waste of sulfuric acid, it will also increase a large amount of reagent costs and chemical sludge disposal costs, and at the same time, it will also cause the remaining copper in the electrolytic clear liquid to be unable to be fully extracted, resulting in a waste of resources. If the electrolytic clear liquid returns to the resin enrichment part for continued regeneration, although it also has a certain regeneration function, because the copper concentration in the electrolytic clear liquid usually remains at about 1g / L, this will lead to incomplete resin regeneration unless a large amount of new regeneration reagents are added.

[0007] As described above, we have designed a composite treatment device that is beneficial for copper recovery from low-concentration copper-containing wastewater to solve the above problems. Utility Model Content

[0008] The utility model aims to solve the shortcomings in the prior art and proposes a composite treatment device which is beneficial to recovering copper from low-concentration copper-containing wastewater.

[0009] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0010] A composite treatment device for recovering copper from low-concentration copper-containing wastewater comprises a device body, wherein the device body is composed of a resin adsorption device, an electrowinning copper extraction device and a nanofiltration concentration device:

[0011] The resin adsorption equipment comprises a resin tank, a resin washing water tank, a regeneration agent tank, a nanofiltration permeate tank and a trench, and the interior of the resin tank is provided with a copper ion adsorption pipeline, a resin washing pipeline, a resin regeneration pipeline and a liquid emptying pipeline;

[0012] The output end of the resin washing water tank is connected to the resin washing pipeline, the output end of the regeneration agent tank is connected to the resin regeneration pipeline, the output end of the nanofiltration permeate tank is connected to the regeneration agent tank, and the output ends of the resin washing pipeline and the liquid emptying pipeline are both connected to the trench;

[0013] The electrolytic copper extraction equipment comprises a high-concentration regeneration liquid tank, an electrolytic circulation tank and a cyclone electrolytic device, wherein the high-concentration regeneration liquid tank, the electrolytic circulation tank and the cyclone electrolytic device are connected in sequence;

[0014] The nanofiltration concentration equipment comprises an electrolytic clear liquid tank, a nanofiltration circulating water tank and a nanofiltration device, wherein the electrolytic clear liquid tank, the nanofiltration circulating water tank and the nanofiltration device are connected in sequence through pipelines, and the nanofiltration device is provided with two output ends, and the output ends of the two nanofiltration devices are respectively connected to the nanofiltration circulating water tank and the nanofiltration permeate tank;

[0015] A pipeline connected to the input end of the high-concentration regeneration liquid tank is connected between the nanofiltration circulating water tank and the nanofiltration device, and a pipeline connected to the input end of the electrolysis clear liquid tank is connected between the output end of the resin tank and the electrolysis circulation tank and the cyclone electrolysis device.

[0016] Preferably, the resin tank is filled with copper ion adsorption resin;

[0017] The resin tank comprises:

[0018] A water inlet, the water inlet is equipped with a water inlet valve, and a resin water inlet precision filter is installed before the water inlet valve;

[0019] A water outlet, on which a resin water outlet valve is mounted;

[0020] a backwash water inlet, on which a resin backwash water inlet valve is mounted;

[0021] a backwash drain outlet, on which a backwash drain valve is mounted;

[0022] a bottom discharge port, on which a resin tank bottom discharge valve is mounted;

[0023] a regeneration liquid inlet port, on which a regeneration liquid inlet valve is mounted;

[0024] Two regeneration liquid discharge ports, one is a high-concentration regeneration liquid discharge port, which is equipped with a high-concentration regeneration liquid discharge valve, and the other is a low-concentration regeneration liquid discharge port, which is equipped with a low-concentration regeneration liquid discharge valve; a copper concentration meter is installed on the resin tank water production pipe;

[0025] The inlet of the resin water inlet precision filter is connected to the pipeline of water to be treated, and the outlet of the resin water production valve is connected to the pipeline of the water production port; the inlet of the resin backwash water inlet valve is connected to the outlet of the resin cleaning water tank by a pipeline; the outlet of the backwash drain valve is connected to the ditch by a pipeline; the outlet of the resin tank bottom drain valve is connected to the ditch by a pipeline; the inlet of the regeneration liquid inlet valve is connected to the outlet of the regeneration agent tank by a pipeline; the outlet of the high-concentration regeneration liquid discharge valve is connected to the high-concentration regeneration liquid tank by a pipeline; and the outlet of the low-concentration regeneration liquid discharge valve is connected to the electrolytic clear liquid tank by a pipeline.

[0026] Preferably, the resin cleaning water tank includes a resin cleaning water tank level gauge, a resin cleaning water pump, a regeneration liquid replacement valve and an industrial water replenishment valve:

[0027] The regeneration agent tank comprises a regeneration agent tank level gauge, a regeneration agent valve and a regeneration pump;

[0028] The nanofiltration permeate tank comprises a nanofiltration permeate tank level gauge and a nanofiltration permeate pump;

[0029] The resin cleaning water tank also includes:

[0030] One inlet with an industrial water replenishment valve installed on the inlet pipe;

[0031] Two outlets, one of which is connected to the inlet of the resin washing water pump by a pipeline, and the other is connected to the inlet of the regeneration pump by a pipeline, and a regeneration liquid replacement valve is provided on the connecting pipeline;

[0032] A resin cleaning water tank level gauge is provided, and at least two liquid levels, a high liquid level and a middle liquid level, are interlocked with the industrial water replenishment valve; when the liquid level is middle, the valve opens and industrial water begins to be replenished into the water tank, and when the liquid level is high, the valve closes.

[0033] The regeneration agent tank also includes:

[0034] An inlet connected to the outlet of the nanofiltration permeate pump by a pipeline;

[0035] An outlet, the outlet pipe is equipped with a regeneration agent valve, and the valve outlet is connected to the regeneration pump inlet by a pipeline;

[0036] A regeneration agent tank level gauge is provided, and high and low liquid levels are set to be interlocked with the corresponding pump valves; when the liquid level is low, the regeneration liquid replacement valve is opened first and then the regeneration agent valve is closed, and the nanofiltration permeate pump is started at the same time, and the pump is stopped when the liquid level is high.

[0037] The nanofiltration permeate tank also includes:

[0038] an inlet connected to a permeate outlet of the nanofiltration device by a pipeline;

[0039] An outlet connected to the inlet of the nanofiltration permeate pump by a pipeline;

[0040] A nanofiltration permeate tank level gauge is interlocked with the nanofiltration permeate pump to stop the pump at a low level.

[0041] Preferably, the resin water inlet precision filter, the water inlet valve and the resin water production valve are connected to form a copper ion adsorption pipeline;

[0042] The resin cleaning water pump, the resin backwashing water inlet valve and the resin backwashing drain valve are connected to form a resin cleaning pipeline;

[0043] The bottom drain valve of the resin tank is connected to the trench to form a liquid drain pipeline;

[0044] The regeneration agent valve, the regeneration pump, the regeneration liquid inlet valve and the high-concentration regeneration liquid discharge valve are connected through to form a resin regeneration pipeline.

[0045] Preferably, the high concentration regeneration liquid tank comprises:

[0046] Two inlets, one is connected to the outlet of the high-concentration regeneration liquid discharge valve of the resin tank by a pipeline, and the other is connected to the nanofiltration circulating water tank and the nanofiltration device by a pipeline;

[0047] The outlet of the nanofiltration concentrated water discharge valve is connected;

[0048] One outlet is connected to the inlet of the high-concentration regeneration liquid pump by a pipeline; a liquid level meter is interlocked with the corresponding high-concentration regeneration liquid pump, and the high-concentration regeneration liquid pump is stopped when the liquid level is low;

[0049] The electrolytic accumulation circulation tank includes an electrolytic accumulation circulation tank level gauge, an electrolytic accumulation circulation pump, an electrolytic accumulation clear liquid discharge valve, and an electrolytic accumulation liquid inlet valve:

[0050] The electrowinning circulation tank also includes:

[0051] Two inlets, one connected to the outlet of the high-concentration regeneration liquid pump by a pipeline, and the other connected to the circulating liquid outlet of the cyclone electrowinning device;

[0052] An outlet is connected to the inlet of the electrolytic circulation pump by a pipeline; the outlet of the electrolytic circulation pump is provided with two branches, one branch is connected to the inlet of the cyclone electrolytic device by a pipeline, and an electrolytic liquid inlet valve is installed on the pipeline, and the other branch is connected to the inlet of the electrolytic clear liquid tank by a pipeline, and an electrolytic clear liquid discharge valve is installed on the pipeline;

[0053] The liquid level gauge of the electrolytic circulation tank is interlocked with the corresponding electrolytic circulation pump: when the liquid level is low, the pump is stopped, the valve is closed, and the high-concentration regeneration liquid pump is started; when the liquid level is high, the high-concentration regeneration liquid pump is stopped.

[0054] Preferably, the electrolytic clear liquid tank comprises an electrolytic clear liquid tank level gauge and an electrolytic clear liquid delivery pump;

[0055] Also includes:

[0056] Two inlets, one inlet is connected to the outlet of the electrolytic clear liquid discharge valve by a pipeline, and the other inlet is connected to the outlet of the low-concentration regeneration liquid discharge valve of the resin tank by a pipeline;

[0057] An outlet is connected to the inlet of the electrolytic clear liquid delivery pump by a pipeline;

[0058] A level gauge of an electrolytic clear liquid tank is interlocked with the electrolytic clear liquid delivery pump, and the pump stops at a low level;

[0059] The nanofiltration circulating water tank includes a nanofiltration circulating water tank level gauge, a nanofiltration water inlet pump, a nanofiltration concentrated water discharge valve and a nanofiltration liquid inlet valve;

[0060] Also includes:

[0061] Two inlets, one connected to the outlet of the electrolytic clear liquid delivery pump by a pipeline, and the other connected to the concentrated water circulation outlet of the nanofiltration device by a pipeline;

[0062] An outlet is connected to the inlet of the nanofiltration water inlet pump by a pipeline; the outlet of the nanofiltration water inlet pump is provided with two branches, one branch is connected to the inlet of the high-concentration regeneration liquid tank by a pipeline, and a nanofiltration concentrated water discharge valve is installed on the pipeline, and the other branch is connected to the inlet of the nanofiltration device by a pipeline, and a nanofiltration liquid inlet valve is installed on the pipeline;

[0063] A nanofiltration circulating water tank level gauge is provided which is interlocked with the corresponding pump valve: when the liquid level is low, the nanofiltration water inlet pump is stopped first, and then the electrolytic clear liquid delivery pump is started; when the liquid level is high, the electrolytic clear liquid delivery pump is stopped.

[0064] Preferably, the nanofiltration device includes a nanofiltration water inlet precision filter, a low pressure switch, a nanofiltration high pressure pump, a high pressure switch, a nanofiltration water inlet pressure gauge, a nanofiltration concentrated water pressure gauge, a nanofiltration concentrated water circulation valve, and a nanofiltration water production flow meter;

[0065] Also includes:

[0066] A permeate port, a concentrate circulation port and a liquid inlet; the permeate port is connected to the inlet of the nanofiltration permeate tank through a pipeline, and a nanofiltration water production flowmeter is provided on the pipeline; the concentrate circulation port is connected to the inlet of the nanofiltration circulating water tank through a pipeline, and a nanofiltration concentrate pressure gauge and a nanofiltration concentrate circulation valve are installed on the pipeline; the nanofiltration liquid inlet is connected to the nanofiltration liquid inlet valve through a pipeline, and a nanofiltration water inlet precision filter, a low-pressure switch, a nanofiltration high-pressure pump, a high-pressure switch and a nanofiltration water inlet pressure gauge are installed in sequence in the water inlet direction.

[0067] Compared with the prior art, the beneficial effects of the utility model are:

[0068] (1) Reduced membrane footprint and membrane investment costs. The acid-resistant nanofiltration equipment used in this device is only used to concentrate the low-concentration copper-containing regeneration liquid and electrolytic clear liquid obtained by the resin adsorption process, rather than to directly concentrate copper-containing wastewater. In comparison, the amount of regeneration wastewater from the membrane of this process is less than 1 / 100 of the amount of low-concentration copper-containing wastewater, and the amount of treated water is greatly reduced. Therefore, this process greatly reduces the amount of membrane used, thereby reducing the membrane footprint and reducing the membrane investment cost;

[0069] (2) Reduced membrane management and maintenance costs. Because the amount of nanofiltration membrane used is greatly reduced, and the nanofiltration membrane is only used to treat the regeneration liquid of the resin, the regeneration liquid is purer than the original wastewater, and there is no risk of impurities and organic matter blockage brought by low-concentration copper-containing wastewater from the source, so the membrane management and maintenance costs can be greatly reduced.

[0070] (3) Saving resin regeneration reagents. A sulfuric acid solution that meets the requirements of resin regeneration liquid is obtained on the acid-resistant nanofiltration permeate side, and the sulfuric acid is recycled, which can save the cost of resin regeneration reagents.

[0071] (4) Improved copper recovery rate in wastewater. This device uses acid-resistant nanofiltration to treat the electrolytic clear liquid, which can further concentrate the copper in the electrolytic clear liquid to meet the inlet concentration requirements of the electrolytic clear liquid, thereby further recovering the copper in the electrolytic clear liquid. Compared with conventional physical and chemical treatment of the electrolytic clear liquid, the copper recovery rate is improved.

[0072] (5) Savings on reagent costs and sludge disposal costs. Compared with conventional electrolytic sludge physicochemical treatment, this device saves reagent costs for electrolytic sludge physicochemical treatment and the disposal costs of chemical sludge generated by the physicochemical treatment.

[0073] (6) Improved the current efficiency of electrolytic equipment and saved electricity. The device collects resin regeneration liquid by classification and only electrolytically extracts copper from high-concentration regeneration liquid, meeting the concentration requirements of the inlet liquid for electrolytic copper extraction, greatly improving the current efficiency of electrolytic deposition and saving electricity consumption.

[0074] (7) High-quality cathode copper can be recovered while ensuring that the copper content of wastewater meets the standard, with a copper content of up to 99.98%. BRIEF DESCRIPTION OF THE DRAWINGS

[0075] Figure 1 This is a schematic diagram of the structure of a composite treatment device proposed by the utility model for recovering copper from low-concentration copper-containing wastewater;

[0076] Figure 2 for Figure 1 A magnified view of the resin adsorption equipment;

[0077] Figure 3 for Figure 1 A magnified view of the copper extraction equipment at CEC;

[0078] Figure 4 for Figure 1 Enlarged view of the nanofiltration concentration device.

[0079] In the figure: 1 resin tank, 1-1 resin water inlet valve, 1-2 resin water production valve, 1-3 resin backwash water inlet valve, 1-4 resin backwash drain valve, 1-5 resin tank bottom drain valve, 1-6 regeneration liquid inlet valve, 1-7 high concentration regeneration liquid discharge valve, 1-8-low concentration regeneration liquid discharge valve, 1-9 resin water production copper detector, 1-10 resin water inlet precision filter, 2 resin cleaning water tank, 2-1 resin cleaning water tank level gauge, 2-2 resin cleaning water pump, 2-3 regeneration liquid replacement valve, 2-4 industrial water replenishment valve, 3 regeneration agent tank, 3-1 regeneration agent tank level gauge, 3-2 regeneration agent valve, 3-3 regeneration pump, 4 nanofiltration permeate tank, 4-1 nanofiltration permeate tank level gauge, 4-2 nanofiltration permeate pump, 5 trench, 6 high concentration regeneration liquid tank, 6-1 high concentration Regeneration liquid tank level gauge, 6-2 high concentration regeneration liquid pump, 7 electrolysis circulation tank, 7-1 electrolysis circulation tank level gauge, 7-2 electrolysis circulation pump, 7-3 electrolysis clear liquid discharge valve, 7-4 electrolysis inlet valve, 8 cyclone electrolysis device, 9 electrolysis clear liquid tank, 9-1 electrolysis clear liquid tank level gauge, 9-2 electrolysis clear liquid delivery pump; 10 nanofiltration circulating water tank, 10-1 nanofiltration circulating water tank level gauge, 10-2 nanofiltration inlet pump, 10-3 nanofiltration concentrated water discharge valve, 10-4 nanofiltration inlet valve; 11 nanofiltration device, 11-1 nanofiltration inlet precision filter, 11-2 low pressure switch, 11-3 nanofiltration high pressure pump, 11-4 high pressure switch, 11-5 nanofiltration inlet pressure gauge, 11-6 nanofiltration concentrated water pressure gauge, 11-7 nanofiltration concentrated water circulation valve, 11-8 nanofiltration produced water flow meter. DETAILED DESCRIPTION

[0080] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0081] Example

[0082] Reference Figure 1-4 A composite treatment device for recovering copper from low-concentration copper-containing wastewater includes a device body, which is composed of a resin adsorption device, an electrowinning copper extraction device, and a nanofiltration concentration device:

[0083] The resin adsorption equipment comprises a resin tank 1, a resin washing water tank 2, a regeneration agent tank 3, a nanofiltration permeate tank 4 and a trench 5. The resin tank 1 is provided with a copper ion adsorption pipeline, a resin washing pipeline, a resin regeneration pipeline and a liquid emptying pipeline.

[0084] The output end of the resin washing water tank 2 is connected to the resin washing pipeline, the output end of the regeneration agent tank 3 is connected to the resin regeneration pipeline, the output end of the nanofiltration permeate tank 4 is connected to the regeneration agent tank 3, and the output ends of the resin washing pipeline and the liquid emptying pipeline are both connected to the trench 5;

[0085] Wherein, the resin tank 1 is filled with copper ion adsorption resin;

[0086] The resin tank 1 includes:

[0087] A water inlet, the water inlet is equipped with a water inlet valve 1-1, and a resin water inlet precision filter 1-10 is installed before the water inlet valve 1-1;

[0088] A water outlet, on which a resin water outlet valve 1-2 is mounted;

[0089] A backwash water inlet, on which a resin backwash water inlet valve 1-3 is installed;

[0090] A backwash drain outlet, on which a backwash drain valve 1-4 is mounted;

[0091] A bottom discharge port, on which a resin tank bottom discharge valve 1-5 is mounted;

[0092] a regeneration liquid inlet port, on which a regeneration liquid inlet valve 1-6 is mounted;

[0093] Two regeneration liquid discharge ports, one is a high-concentration regeneration liquid discharge port, which is equipped with a high-concentration regeneration liquid discharge valve 1-7, and the other is a low-concentration regeneration liquid discharge port, which is equipped with a low-concentration regeneration liquid discharge valve 1-8; a copper concentration meter 1-9 is installed on the resin tank water production pipe;

[0094] The inlet of the resin water inlet precision filter 1-10 is connected to the pipeline of water to be treated, and the outlet of the resin water production valve 1-2 is connected to the pipeline of the water production port; the inlet of the resin backwash water inlet valve 1-3 is connected to the outlet of the resin cleaning water tank 2 by a pipeline; the outlet of the backwash drain valve 1-4 is connected to the ditch 5 by a pipeline; the outlet of the resin tank bottom drain valve 1-5 is connected to the ditch 5 by a pipeline; the inlet of the regeneration liquid inlet valve 1-6 is connected to the outlet of the regeneration agent tank 3 by a pipeline; the outlet of the high-concentration regeneration liquid discharge valve 1-7 is connected to the high-concentration regeneration liquid tank 6 by a pipeline; the outlet of the low-concentration regeneration liquid discharge valve 1-8 is connected to the electrolytic clear liquid tank 9 by a pipeline.

[0095] Preferably, the resin cleaning water tank 2 includes a resin cleaning water tank level gauge 2-1, a resin cleaning water pump 2-2, a regeneration liquid replacement valve 2-3 and an industrial water replenishment valve 2-4:

[0096] The regeneration agent tank 3 includes a regeneration agent tank level meter 3-1, a regeneration agent valve 3-2 and a regeneration pump 3-3;

[0097] The nanofiltration permeate tank 4 includes a nanofiltration permeate tank level meter 4-1 and a nanofiltration permeate pump 4-2;

[0098] The resin cleaning water tank 2 also includes:

[0099] An inlet, and an industrial water replenishment valve 2-4 is installed on the inlet pipe;

[0100] Two outlets, one of which is connected to the inlet of the resin cleaning water pump 2-2 by a pipeline, and the other outlet is connected to the inlet of the regeneration pump 3-3 by a pipeline, and a regeneration liquid replacement valve 2-3 is provided on the connecting pipeline;

[0101] A resin cleaning water tank level gauge 2-1 is provided, and at least two liquid levels, a high liquid level and a middle liquid level, are interlocked with an industrial water replenishing valve 2-4; when the liquid level is middle, the valve 2-4 opens and starts replenishing industrial water into the water tank 2, and when the liquid level is high, the valve 2-4 closes.

[0102] Regeneration tank 3 also includes:

[0103] An inlet is connected to the outlet of the nanofiltration permeate pump 4-2 by a pipeline;

[0104] An outlet, the outlet pipe is equipped with a regeneration agent valve 3-2, and the valve outlet is connected to the inlet of the regeneration pump 3-3 by a pipeline;

[0105] A regeneration agent tank level gauge 3-1 is provided, and two liquid levels, high level and low level, are set and interlocked with corresponding pump valves; when the liquid level is low, the regeneration liquid replacement valve 2-3 is opened first and then the regeneration agent valve 3-2 is closed, and the nanofiltration permeate pump 4-2 is started at the same time, and the 4-2 pump is stopped when the liquid level is high.

[0106] The nanofiltration permeate tank 4 also includes:

[0107] an inlet connected to the permeate outlet of the nanofiltration device 11 by a pipeline;

[0108] An outlet is connected to the inlet of the nanofiltration permeate pump 4-2 by a pipeline;

[0109] A nanofiltration permeate tank level gauge 4-1 is interlocked with a nanofiltration permeate pump 4-2 to stop the pump at a low level.

[0110] Preferably, the resin water inlet precision filter 1-10, the water inlet valve 1-1 and the resin water production valve 1-2 are connected to form a copper ion adsorption pipeline;

[0111] The resin cleaning water pump 2-2, the resin backwashing water inlet valve 1-3 and the resin backwashing drain valve 1-4 are connected to form a resin cleaning pipeline;

[0112] The bottom drain valve 1-5 of the resin tank is connected to the trench 5 to form a liquid drain pipeline;

[0113] The regeneration agent valve 3-2, the regeneration pump 3-3, the regeneration liquid inlet valve 1-6 and the high-concentration regeneration liquid discharge valve 1-7 are connected to form a resin regeneration pipeline;

[0114] The electrolytic copper extraction equipment comprises a high-concentration regeneration liquid tank 6, an electrolytic circulation tank 7 and a cyclone electrolytic device 8, and the high-concentration regeneration liquid tank 6, the electrolytic circulation tank 7 and the cyclone electrolytic device 8 are connected in sequence;

[0115] More specifically, the high concentration regeneration liquid tank 6 comprises:

[0116] Two inlets, one is connected to the outlet of the high-concentration regeneration liquid discharge valve 1-7 of the resin tank 1 by a pipeline, and the other is connected to the nanofiltration circulating water tank 10 and the nanofiltration device 11 by a pipeline;

[0117] The outlet of the nanofiltration concentrated water discharge valve 10-3 is connected;

[0118] An outlet is connected to the inlet of the high-concentration regeneration liquid pump 6-2 by a pipeline; a liquid level meter is interlocked with the corresponding high-concentration regeneration liquid pump 6-2, and the high-concentration regeneration liquid pump 6-2 is stopped when the liquid level is low;

[0119] The electrolytic circulation tank 7 includes an electrolytic circulation tank level gauge 7-1, an electrolytic circulation pump 7-2, an electrolytic clear liquid discharge valve 7-3, and an electrolytic liquid inlet valve 7-4:

[0120] The electrolytic circulation tank 7 also includes:

[0121] Two inlets, one connected to the outlet of the high-concentration regeneration liquid pump 6-2 by a pipeline, and the other connected to the circulating liquid outlet of the cyclone electrowinning device 8;

[0122] An outlet is connected to the inlet of the electrolytic circulation pump 7-2 by a pipeline; the outlet of the electrolytic circulation pump 7-2 is provided with two branches, one of which is connected to the inlet of the cyclone electrolytic device 8 by a pipeline, and an electrolytic liquid inlet valve 7-4 is installed on the pipeline, and the other branch is connected to the inlet of the electrolytic clear liquid tank 9 by a pipeline, and an electrolytic clear liquid discharge valve 7-3 is installed on the pipeline;

[0123] The electrolytic circulation tank level gauge 7-1 is interlocked with the corresponding electrolytic circulation pump 7-2: when the liquid level is low, the pump 7-2 is stopped, the valve 7-3 is closed, and the high-concentration regeneration liquid pump 6-2 is turned on; when the liquid level is high, the high-concentration regeneration liquid pump 6-2 is stopped;

[0124] The nanofiltration concentration equipment includes an electrolytic clear liquid tank 9, a nanofiltration circulating water tank 10 and a nanofiltration device 11, wherein the electrolytic clear liquid tank 9, the nanofiltration circulating water tank 10 and the nanofiltration device 11 are sequentially connected by pipelines, and the nanofiltration device 11 is provided with two output ends, and the output ends of the two nanofiltration devices 11 are respectively connected to the nanofiltration circulating water tank 10 and the nanofiltration permeate tank 4;

[0125] A pipeline connected to the input end of the high-concentration regeneration liquid tank 6 is connected between the nanofiltration circulating water tank 10 and the nanofiltration device 11, and a pipeline connected to the input end of the electrolysis clear liquid tank 9 is connected between the output end of the resin tank 1 and the electrolysis circulation tank 7 and the cyclone electrolysis device 8.

[0126] The electrolytic clear liquid tank 9 includes an electrolytic clear liquid tank level gauge 9-1 and an electrolytic clear liquid delivery pump 9-2;

[0127] Also includes:

[0128] Two inlets, one inlet is connected to the outlet of the electrolytic clear liquid discharge valve 7-3 by a pipeline, and the other inlet is connected to the outlet of the low-concentration regeneration liquid discharge valve 1-8 of the resin tank 1 by a pipeline;

[0129] An outlet is connected to the inlet of the electrolytic clear liquid delivery pump 9-2 by a pipeline;

[0130] A level gauge 9-1 of an electrolytic clear liquid tank and an electrolytic clear liquid delivery pump 9-2 are interlocked, and the pump is stopped at a low level;

[0131] The nanofiltration circulating water tank 10 includes a nanofiltration circulating water tank level gauge 10-1, a nanofiltration water inlet pump 10-2, a nanofiltration concentrated water discharge valve 10-3 and a nanofiltration liquid inlet valve 10-4;

[0132] Also includes:

[0133] Two inlets, one is connected to the outlet of the electrolytic clear liquid delivery pump 9-2 by a pipeline, and the other is connected to the concentrated water circulation outlet of the nanofiltration device 11 by a pipeline;

[0134] An outlet is connected to the inlet of the nanofiltration water inlet pump 10-2 by a pipeline; the outlet of the nanofiltration water inlet pump 10-2 is provided with two branches, one branch is connected to the inlet of the high-concentration regeneration liquid tank 6 by a pipeline, and a nanofiltration concentrated water discharge valve 10-3 is installed on the pipeline, and the other branch is connected to the inlet of the nanofiltration device 11 by a pipeline, and a nanofiltration liquid inlet valve 10-4 is installed on the pipeline;

[0135] A nanofiltration circulating water tank level gauge 10-1 is provided which is interlocked with the corresponding pump valve: when the liquid level is low, the nanofiltration water inlet pump 10-2 is stopped first, and then the electrolytic clear liquid delivery pump 9-2 is started; when the liquid level is high, the electrolytic clear liquid delivery pump 9-2 is stopped.

[0136] Preferably, the nanofiltration device 11 includes a nanofiltration inlet precision filter 11-1, a low pressure switch 11-2, a nanofiltration high pressure pump 11-3, a high pressure switch 11-4, a nanofiltration inlet pressure gauge 11-5, a nanofiltration concentrated water pressure gauge 11-6, a nanofiltration concentrated water circulation valve 11-7, and a nanofiltration produced water flow meter 11-8;

[0137] Also includes:

[0138] A permeate port, a concentrate circulation port and a liquid inlet; the permeate port is connected to the inlet of the nanofiltration permeate tank 4 through a pipeline, and a nanofiltration water production flowmeter 11-8 is provided on the pipeline; the concentrate circulation port is connected to the inlet of the nanofiltration circulating water tank 10 through a pipeline, and a nanofiltration concentrate pressure gauge 11-6 and a nanofiltration concentrate circulation valve 11-7 are installed on the pipeline; the nanofiltration liquid inlet is connected to the nanofiltration liquid inlet valve 10-4 through a pipeline, and a nanofiltration water inlet precision filter 11-1, a low pressure switch 11-2, a nanofiltration high pressure pump 11-3, a high pressure switch 11-4 and a nanofiltration water inlet pressure gauge 11-5 are installed in sequence in the water inlet direction.

[0139] Working process of this embodiment

[0140] The device mainly includes three sets of main equipment, namely resin adsorption equipment, electrolytic copper extraction equipment and nanofiltration concentration equipment. The resin is a chelating resin that has the ability to adsorb copper and can use sulfuric acid as a regeneration liquid for elution and regeneration; the electrolytic copper extraction equipment is a cyclone electrolytic equipment; the nanofiltration concentration equipment is an acid-resistant nanofiltration

[0141] The function of the resin adsorption equipment is as follows: the copper is enriched in the low-concentration copper-containing wastewater by the regeneration process after the resin is saturated, so that the copper is enriched in the resin regeneration liquid. The regeneration liquid is divided into two parts, high concentration and low concentration, and collected separately. The high-concentration regeneration liquid generated in the early stage of the regeneration process can directly enter the cyclone electrowinning equipment, and the low-concentration regeneration liquid generated in the late stage of the regeneration process is concentrated in the nanofiltration equipment until the inlet concentration requirements of the cyclone electrowinning equipment are met.

[0142] The functions of the cyclone electrowinning copper extraction equipment are as follows: electrowinning copper is performed on the resin regeneration liquid and nanofiltration concentrate with high copper concentration, and cathode copper is recovered. The solution after copper is extracted is the electrowinning clear solution, and the residual concentration of copper ions in the cyclone electrowinning clear solution is generally within 1g / L.

[0143] The functions of the nanofiltration concentration equipment are as follows: to concentrate the resin regeneration liquid and electrolytic clear liquid with low copper concentration. The copper ions in the solution are isolated in the concentrated water side, and the copper ion concentration in the nanofiltration concentrated water is increased to meet the concentration requirements of the cyclone electrolytic feed liquid; at the same time, the sulfuric acid solution is allowed to pass through the nanofiltration membrane, which is equivalent to regenerating the regeneration agent of the resin, so that it has the regeneration function of the resin again and is repeatedly used in the resin regeneration process.

[0144] Before the device is put into operation, it is necessary to check the device in advance to ensure that all valves and water pumps are in the closed state.

[0145] The specific workflow is as follows:

[0146] 1. Working process of resin adsorption equipment

[0147] One working cycle of the resin adsorption equipment includes the following five procedures: adsorption, backwash 1, emptying, regeneration and backwash 2.

[0148] (1) Adsorption

[0149] Open the resin water inlet valve 1-1 and the resin water production valve 1-2, and the water to be treated will enter the resin tank 1 through the resin water inlet precision filter 1-10 and the resin water inlet valve 1-1 in turn, flow through the resin layer from top to bottom, and then flow out from the resin water production valve 1-2.

[0150] When the water to be treated flows through the resin layer, the copper ions in the water to be treated will be adsorbed by the resin, and the water (product water) with the copper ions removed will be discharged from the system. During the adsorption process, the copper ion concentration of the product water needs to be monitored by the copper detector 1-9 at all times. When the concentration is higher than the set value, the resin water inlet valve 1-1 and the resin water production valve 1-2 are closed to end the adsorption process.

[0151] (2) Backwash 1

[0152] First open the resin backwash inlet valve 1-3 and the resin backwash drain valve 1-4, then open the resin cleaning water pump 2-2, the cleaning water will enter the resin tank 1, flow through the resin layer from bottom to top, clean the resin, and the backwash water will flow out from the resin backwash drain valve 1-4 into the ditch.

[0153] When the backwash 1 time t1 = 30 min (adjustable), first close the resin cleaning water pump 2-2, then close the resin backwash water inlet valve 1-3 and the resin backwash drain valve 1-4, and the backwash process ends.

[0154] (3) Emptying

[0155] Open the resin tank bottom drain valve 1-5 to drain the water in the resin tank 1 to prevent the water in the resin tank 1 from diluting the copper ion concentration in the regeneration liquid.

[0156] When the emptying time t2 = 3 min (adjustable), close the resin tank bottom drain valve 1-5; the emptying process is completed.

[0157] (4)Regeneration

[0158] ① First open the regeneration liquid inlet valve 1-6, high concentration regeneration liquid discharge valve 1-7 and regeneration agent valve 3-2.

[0159] ② After a delay of 5s, turn on the regeneration pump 3-3 and start the t3 timing at the same time.

[0160] ③ When t3 = 30min (adjustable), first open the low-concentration regeneration liquid discharge valve 1-8, and then close the high-concentration regeneration liquid discharge valve 1-7.

[0161] ④ When the regeneration agent tank 3 reaches the low liquid level, first open the regeneration liquid replacement valve 2-3 and start the t4 timing at the same time.

[0162] ⑤ Delay 5s to close the regeneration agent valve 3-2, and start the nanofiltration permeate pump 4-2 at the same time to replenish the nanofiltration permeate into the regeneration agent tank 3 for use in the next resin regeneration. When the regeneration agent tank 3 reaches the high liquid level, stop the 4-2 pump.

[0163] ⑤ When t4 = 20min (adjustable), first close the regeneration pump 3-3, then close the regeneration liquid inlet valve 1-6, the low-concentration regeneration liquid discharge valve 1-8 and the regeneration liquid replacement valve 2-3.

[0164] The regeneration process ends here.

[0165] Note: When the regeneration agent tank 3 reaches a low liquid level, the regeneration liquid replacement valve 2-3 is opened and the regeneration agent valve 3-2 is closed in order to continue to use industrial water to push the regeneration liquid in the resin tank out of the resin tank in the same direction and at the same flow rate as regeneration. This step can be regarded as a continuation of regeneration.

[0166] (5) Backwash 2

[0167] First open the resin backwash inlet valve 1-3 and the resin backwash drain valve 1-4, then open the resin cleaning water pump 2-2, the cleaning water will enter the resin tank, flow through the resin layer from bottom to top, clean the resin, and the backwash water will flow out from the resin backwash drain valve 1-4 into the ditch.

[0168] After the backwash 2 time t5 = 30 min (adjustable), first close the resin cleaning water pump 2-2, then close the resin backwash water inlet valve 1-3 and the resin backwash drain valve 1-4, and the backwash process ends.

[0169] The main purpose of backwash 2 is to clean the residual regeneration liquid in the resin layer so that the equipment can be put into the next working cycle.

[0170] At this point, the resin adsorption equipment has completed a working cycle and can enter the next working cycle according to the above steps.

[0171] (1) Condition confirmation: Before starting the cyclone electrowinning equipment, it is necessary to ensure that the liquid level in the electrowinning circulation tank 7 is at a high level;

[0172] (2) Open the electrolytic liquid inlet valve 7-4, delay for 5 seconds, turn on the electrolytic circulation pump 7-2, the electrolytic reaction begins, and the copper ions in the solution begin to deposit on the cathode of the electrolytic device in the form of a single substance;

[0173] (3) Regularly detect the copper concentration in the circulation tank 7;

[0174] (4) When the copper concentration in the circulation tank 7 is lower than the specified value (1 g / L), the electrolytic clear liquid discharge valve 7-3 is opened first, and then the electrolytic clear liquid inlet valve 7-4 is closed, and the electrolytic clear liquid is sent to the electrolytic clear liquid tank 9;

[0175] (5) When the liquid level in the electrolytic circulation tank 7 is at a low level, first stop the electrolytic circulation pump 7-2, then close the electrolytic clear liquid discharge valve 7-3, and at the same time start the high-concentration regeneration liquid pump 6-2. When the electrolytic circulation tank 7 is at a high level or the high-concentration regeneration liquid tank 6 is at a low level, stop the high-concentration regeneration liquid pump 6-2.

[0176] Note: When the cathode copper in the cyclone electrowinning device 8 accumulates to a certain mass, the cyclone electrowinning equipment needs to be suspended, that is, the electrowinning circulation pump 7-2 is stopped, and the cathode copper is taken out and then the above steps (1) to (5) are restarted.

[0177] 3. Working process of nanofiltration concentration equipment

[0178] (1) Condition confirmation: Before starting the nanofiltration concentration equipment, it is necessary to ensure that the liquid level in the nanofiltration circulating water tank 10 is at a high level;

[0179] (2) Open the nanofiltration concentrated water circulation valve 11-7, the nanofiltration liquid inlet valve 10-4 and the nanofiltration water inlet pump 10-2 in sequence;

[0180] (3) After a delay of 5 seconds, the nanofiltration high-pressure pump 11 - 3 is turned on; the nanofiltration high-pressure pump 11 - 3 is a variable frequency high-pressure pump, and the frequency of the pump needs to be increased slowly and gradually during the turning-on process.

[0181] (4) According to the reading of the nanofiltration water flow meter 11-8, the opening of the nanofiltration concentrated water circulation valve 11-7 is adjusted to control the recovery rate of the nanofiltration permeate at a specified value. The nanofiltration concentration equipment starts to work, and the nanofiltration permeate (nanofiltration water) enters the nanofiltration permeate tank; the nanofiltration concentrate is continuously circulated and concentrated until its concentration reaches the inlet concentration requirement of the electrolytic equipment.

[0182] (5) During the operation, the nanofiltration inlet pressure is monitored by the nanofiltration inlet pressure gauge 11-5. When the pressure reaches the specified value, the frequency of the high-pressure pump 11-3 is gradually reduced until the pump is stopped. At this time, the copper ion concentration of the solution in the nanofiltration circulating water tank 10 reaches the inlet concentration requirement of the electrolytic equipment.

[0183] (6) Open the nanofiltration concentrated water discharge valve 10-3, then close the nanofiltration liquid inlet valve 10-4, and discharge the concentrated liquid in the nanofiltration circulating water tank 10 into the high-concentration regeneration liquid tank.

[0184] (7) When the liquid level in the nanofiltration circulating water tank 10 is low, the nanofiltration water inlet pump 10-2 is stopped and the nanofiltration concentrated water discharge valve 10-3 is closed.

[0185] Notes: ① The nanofiltration water inlet precision filter 11-1 is a conventional accessory for the water inlet of the nanofiltration equipment, which plays a role in protecting the nanofiltration membrane; ② The low-pressure switch 11-2 and the high-pressure switch 11-4 are conventional accessories for the high-pressure pump of the nanofiltration concentration equipment, which play a role in protecting the high-pressure pump; ③ The reading of the nanofiltration water inlet pressure gauge 11-5 is closely related to the copper ion concentration in the nanofiltration circulating water tank 10. The higher the concentration, the greater the pressure gauge reading.

[0186] In the utility model:

[0187] (1) Technological innovation

[0188] Compared with the common low-concentration copper-containing wastewater resource recovery system, the main differences of this process are:

[0189] ①Innovative combination of resin adsorption, nanofiltration concentration and copper electrowinning;

[0190] ② The resin regeneration liquid is divided into two categories: high-concentration regeneration liquid and low-concentration regeneration liquid, instead of being collected uniformly for electrowinning or concentration. The high-concentration regeneration liquid is directly sent to the electrowinning equipment for electrowinning, and the low-concentration regeneration liquid is further concentrated by acid-resistant nanofiltration.

[0191] ③ Recover the remaining copper in the electrolytic clear liquid. The electrolytic clear liquid is treated with acid-resistant nanofiltration to obtain a concentrated liquid that meets the electrolytic feed concentration requirements on the concentrated water side, and the copper in the electrolytic clear liquid is recovered;

[0192] ④ Recover sulfuric acid (resin regeneration liquid). By treating the electrolytic clear liquid with acid-resistant nanofiltration, a sulfuric acid solution that meets the requirements of resin regeneration liquid can be obtained on the permeate side, and the sulfuric acid is recycled;

[0193] (2) Technical advantages

[0194] (1) Reduced membrane footprint and membrane investment costs. The acid-resistant nanofiltration equipment used in this device is only used to concentrate the low-concentration copper-containing regeneration liquid and electrolytic clear liquid obtained by the resin adsorption process, rather than to directly concentrate copper-containing wastewater. In comparison, the amount of regeneration wastewater from the membrane of this process is less than 1 / 100 of the amount of low-concentration copper-containing wastewater, and the amount of treated water is greatly reduced. Therefore, this process greatly reduces the amount of membrane used, thereby reducing the membrane footprint and reducing the membrane investment cost;

[0195] (2) Reduced membrane management and maintenance costs. Because the amount of nanofiltration membrane used is greatly reduced, and the nanofiltration membrane is only used to treat the regeneration liquid of the resin, the regeneration liquid is purer than the original wastewater, and there is no risk of impurities and organic matter blockage brought by low-concentration copper-containing wastewater from the source, so the membrane management and maintenance costs can be greatly reduced.

[0196] (3) Saving resin regeneration reagents. A sulfuric acid solution that meets the requirements of resin regeneration liquid is obtained on the acid-resistant nanofiltration permeate side, and the sulfuric acid is recycled, which can save the cost of resin regeneration reagents.

[0197] (4) Improved copper recovery rate in wastewater. This device uses acid-resistant nanofiltration to treat the electrolytic clear liquid, which can further concentrate the copper in the electrolytic clear liquid to meet the inlet concentration requirements of the electrolytic clear liquid, thereby further recovering the copper in the electrolytic clear liquid. Compared with conventional physical and chemical treatment of the electrolytic clear liquid, the copper recovery rate is improved.

[0198] (5) Savings on reagent costs and sludge disposal costs. Compared with conventional electrolytic sludge physicochemical treatment, this device saves reagent costs for electrolytic sludge physicochemical treatment and the disposal costs of chemical sludge generated by the physicochemical treatment.

[0199] (6) Improved the current efficiency of electrolytic equipment and saved electricity. The device collects resin regeneration liquid by classification and only electrolytically extracts copper from high-concentration regeneration liquid, meeting the concentration requirements of the inlet liquid for electrolytic copper extraction, greatly improving the current efficiency of electrolytic deposition and saving electricity consumption.

[0200] (7) High-quality cathode copper can be recovered while ensuring that the copper content of wastewater meets the standard, with a copper content of up to 99.98%.

[0201] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0202] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0203] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited to the above embodiments. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of protection claimed by the utility model. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A composite treatment device for recovering copper from low-concentration copper-containing wastewater, comprising a device body, characterized in that: The device body is composed of resin adsorption equipment, electrowinning copper extraction equipment and nanofiltration concentration equipment: The resin adsorption equipment comprises a resin tank (1), a resin washing water tank (2), a regeneration agent tank (3), a nanofiltration permeate tank (4) and a trench (5); a copper ion adsorption pipeline, a resin washing pipeline, a resin regeneration pipeline and a liquid draining pipeline are arranged inside the resin tank (1); The output end of the resin washing water tank (2) is connected to the resin washing pipeline, the output end of the regeneration agent tank (3) is connected to the resin regeneration pipeline, the output end of the nanofiltration permeate tank (4) is connected to the regeneration agent tank (3), and the output ends of the resin washing pipeline and the liquid emptying pipeline are both connected to the trench (5); The electrolytic copper extraction equipment comprises a high-concentration regeneration liquid tank (6), an electrolytic circulation tank (7) and a cyclone electrolytic device (8), wherein the high-concentration regeneration liquid tank (6), the electrolytic circulation tank (7) and the cyclone electrolytic device (8) are connected in sequence; The nanofiltration concentration equipment comprises an electrolytic clear liquid tank (9), a nanofiltration circulating water tank (10) and a nanofiltration device (11); the electrolytic clear liquid tank (9), the nanofiltration circulating water tank (10) and the nanofiltration device (11) are connected in sequence through pipelines; the nanofiltration device (11) is provided with two output ends, and the two output ends of the nanofiltration devices (11) are respectively connected to the nanofiltration circulating water tank (10) and the nanofiltration permeate tank (4); A pipeline connected to the input end of the high-concentration regeneration liquid tank (6) is connected between the nanofiltration circulating water tank (10) and the nanofiltration device (11), and a pipeline connected to the input end of the electrolytic clear liquid tank (9) is connected between the output end of the resin tank (1) and the electrolytic circulation tank (7) and the cyclone electrolytic device (8).

2. A composite treatment device for recovering copper from low-concentration copper-containing wastewater according to claim 1, characterized in that: The resin tank (1) is filled with copper ion adsorption resin; The resin tank (1) comprises: A water inlet, the water inlet is equipped with a water inlet valve (1-1), and a resin water inlet precision filter (1-10) is installed before the water inlet valve (1-1); A water production port, on which a resin water production valve (1-2) is installed; A backwash water inlet, on which a resin backwash water inlet valve (1-3) is mounted; A backwash drain outlet, on which a backwash drain valve (1-4) is mounted; A bottom discharge port, on which a resin tank bottom discharge valve (1-5) is mounted; A regeneration liquid inlet port, on which a regeneration liquid inlet valve (1-6) is mounted; Two regeneration liquid discharge ports, one is a high-concentration regeneration liquid discharge port, which is equipped with a high-concentration regeneration liquid discharge valve (1-7), and the other is a low-concentration regeneration liquid discharge port, which is equipped with a low-concentration regeneration liquid discharge valve (1-8); a copper concentration meter (1-9) is installed on the resin tank water production pipe; The inlet of the resin water inlet precision filter (1-10) is connected to the pipeline of the water to be treated, and the outlet of the resin water production valve (1-2) is connected to the pipeline of the water production port; the inlet of the resin backwash water inlet valve (1-3) is connected to the outlet of the resin cleaning water tank (2) by a pipeline; the outlet of the backwash drain valve (1-4) is connected to the ditch (5) by a pipeline; the outlet of the resin tank bottom drain valve (1-5) is connected to the ditch (5) by a pipeline; the inlet of the regeneration liquid inlet valve (1-6) is connected to the outlet of the regeneration agent tank (3) by a pipeline; the outlet of the high-concentration regeneration liquid discharge valve (1-7) is connected to the high-concentration regeneration liquid tank (6) by a pipeline; and the outlet of the low-concentration regeneration liquid discharge valve (1-8) is connected to the electrolytic clear liquid tank (9) by a pipeline.

3. A composite treatment device for recovering copper from low-concentration copper-containing wastewater according to claim 2, characterized in that: The resin cleaning water tank (2) comprises a resin cleaning water tank level gauge (2-1), a resin cleaning water pump (2-2), a regeneration liquid replacement valve (2-3) and an industrial water replenishment valve (2-4): The regeneration agent tank (3) comprises a regeneration agent tank level meter (3-1), a regeneration agent valve (3-2) and a regeneration pump (3-3); The nanofiltration permeate tank (4) comprises a nanofiltration permeate tank level meter (4-1) and a nanofiltration permeate pump (4-2); The resin cleaning water tank (2) also includes: An inlet with an industrial water replenishment valve (2-4) installed on the inlet pipe; Two outlets, one of which is connected to the inlet of a resin washing water pump (2-2) by a pipeline, and the other is connected to the inlet of a regeneration pump (3-3) by a pipeline, and a regeneration liquid replacement valve (2-3) is provided on the connecting pipeline; A resin cleaning water tank level gauge (2-1), with at least two levels, a high level and a middle level, interlocked with an industrial water replenishment valve (2-4); The regeneration agent tank (3) also includes: An inlet connected to the outlet of the nanofiltration permeate pump (4-2) by a pipeline; An outlet, the outlet pipe is provided with a regeneration agent valve (3-2), and the valve outlet is connected to the inlet of the regeneration pump (3-3) by a pipeline; The nanofiltration permeate tank (4) further comprises: an inlet connected to a permeate outlet of the nanofiltration device (11) by a pipeline; An outlet connected to the inlet of the nanofiltration permeate pump (4-2) by a pipeline; A nanofiltration permeate tank level gauge (4-1) is interlocked with a nanofiltration permeate pump (4-2).

4. A composite treatment device for recovering copper from low-concentration copper-containing wastewater according to claim 3, characterized in that: The resin water inlet precision filter (1-10), the water inlet valve (1-1) and the resin water production valve (1-2) are connected to form a copper ion adsorption pipeline; The resin cleaning water pump (2-2), the resin backwashing water inlet valve (1-3) and the resin backwashing drain valve (1-4) are connected to form a resin cleaning pipeline; The resin tank bottom drain valve (1-5) is connected to the ditch (5) to form a liquid drain pipeline; The regeneration agent valve (3-2), the regeneration pump (3-3), the regeneration liquid inlet valve (1-6) and the high-concentration regeneration liquid discharge valve (1-7) are connected to form a resin regeneration pipeline.

5. A composite treatment device for recovering copper from low-concentration copper-containing wastewater according to claim 2, characterized in that: The high-concentration regeneration liquid tank (6) comprises: Two inlets, one of which is connected to the outlet of the high-concentration regeneration liquid discharge valve (1-7) of the resin tank (1) by a pipeline, and the other is connected to the nanofiltration circulating water tank (10) and the nanofiltration device (11) by a pipeline; an outlet connected to the inlet of a high-concentration regeneration liquid pump (6-2) by a pipeline; The electrolytic deposition circulation tank (7) comprises an electrolytic deposition circulation tank level gauge (7-1), an electrolytic deposition circulation pump (7-2), an electrolytic deposition clear liquid discharge valve (7-3), and an electrolytic deposition liquid inlet valve (7-4): The electrolytic circulation tank (7) further comprises: Two inlets, one connected to the outlet of the high-concentration regeneration liquid pump (6-2) by a pipeline, and the other connected to the circulating liquid outlet of the cyclone electrowinning device (8); An outlet is connected to the inlet of an electrolytic circulation pump (7-2) by a pipeline; the outlet of the electrolytic circulation pump (7-2) is provided with two branches, one branch is connected to the inlet of a cyclone electrolytic device (8) by a pipeline, and an electrolytic liquid inlet valve (7-4) is installed on the pipeline, and the other branch is connected to the inlet of an electrolytic clear liquid tank (9) by a pipeline, and an electrolytic clear liquid discharge valve (7-3) is installed on the pipeline.

6. A composite treatment device for recovering copper from low-concentration copper-containing wastewater according to claim 5, characterized in that: The electrolytic clear liquid tank (9) comprises an electrolytic clear liquid tank level gauge (9-1) and an electrolytic clear liquid delivery pump (9-2); Also includes: Two inlets, one inlet is connected to the outlet of the electrolytic clear liquid discharge valve (7-3) by a pipeline, and the other inlet is connected to the outlet of the low-concentration regeneration liquid discharge valve (1-8) of the resin tank (1) by a pipeline; An outlet connected to the inlet of the electrolytic clear liquid delivery pump (9-2) by a pipeline; The nanofiltration circulating water tank (10) comprises a nanofiltration circulating water tank level meter (10-1), a nanofiltration water inlet pump (10-2), a nanofiltration concentrated water discharge valve (10-3) and a nanofiltration liquid inlet valve (10-4); Also includes: Two inlets, one connected to the outlet of the electrolytic clear liquid delivery pump (9-2) by a pipeline, and the other connected to the concentrated water circulation outlet of the nanofiltration device (11) by a pipeline; An outlet is connected to the inlet of a nanofiltration water inlet pump (10-2) by a pipeline; the outlet of the nanofiltration water inlet pump (10-2) is provided with two branches, one branch is connected to the inlet of a high-concentration regeneration liquid tank (6) by a pipeline, and a nanofiltration concentrated water discharge valve (10-3) is installed on the pipeline, and the other branch is connected to the inlet of a nanofiltration device (11) by a pipeline, and a nanofiltration liquid inlet valve (10-4) is installed on the pipeline.

7. A composite treatment device for recovering copper from low-concentration copper-containing wastewater according to claim 6, characterized in that: The nanofiltration device (11) comprises a nanofiltration water inlet precision filter (11-1), a low pressure switch (11-2), a nanofiltration high pressure pump (11-3), a high pressure switch (11-4), a nanofiltration water inlet pressure gauge (11-5), a nanofiltration concentrated water pressure gauge (11-6), a nanofiltration concentrated water circulation valve (11-7), and a nanofiltration produced water flow meter (11-8); Also includes: A permeate port, a concentrate circulation port and a liquid inlet; the permeate port is connected to the inlet of a nanofiltration permeate tank (4) through a pipeline, and a nanofiltration water production flowmeter (11-8) is provided on the pipeline; the concentrate circulation port is connected to the inlet of a nanofiltration circulation water tank (10) through a pipeline, and a nanofiltration concentrate pressure gauge (11-6) and a nanofiltration concentrate circulation valve (11-7) are provided on the pipeline; the nanofiltration liquid inlet is connected to the nanofiltration liquid inlet valve (10-4) through a pipeline, and a nanofiltration water inlet precision filter (11-1), a low pressure switch (11-2), a nanofiltration high pressure pump (11-3), a high pressure switch (11-4) and a nanofiltration water inlet pressure gauge (11-5) are provided in sequence in the water inlet direction.

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