A copper smelter wastewater quality collection and cascade reuse system

Abstract

The utility model discloses a copper smeltery wastewater is collected with cascade reuse system of quality difference belongs to industrial wastewater resource recycling technical field. The system includes a plurality of water units according to the water quality difference of the whole plant process water, including first grade water unit, second grade water unit, third grade water unit and final stage water unit and wastewater quality treatment unit. The system is classified to copper smeltery water unit, and wastewater quality treatment unit is used to collect and treat wastewater, realizes the whole plant water system's clean and dirty separation, quality difference treatment, quality difference reuse and cascade utilization, reduces wastewater treatment scale, simplifies wastewater collection pipe network, and the whole plant's supply and discharge water balance is optimized comprehensively, has water recycling rate is high, and the advantage such as low engineering cost and operation cost, energy saving and environmental protection.

Description

Technical Field

[0001] This utility model belongs to the field of industrial wastewater resource recycling technology, and specifically relates to a copper smelting wastewater separation collection and cascade reuse system. Background Technology

[0002] Copper smelting production is characterized by large water consumption and diverse water quality requirements. The main water-using units in a copper smelter include makeup water for the circulating cooling water system, makeup water for the demineralized water station, water for the acid production process, and makeup water for the slag slow cooling area. The wastewater generated during copper smelting is diverse and complex in composition, resulting in a long wastewater treatment process and high energy consumption.

[0003] Currently, most copper smelters in China have implemented differentiated water supply and drainage, with production wastewater from each process directly discharged to wastewater treatment plants for differentiated treatment. Qualified reclaimed water from these plants is then reused at appropriate points of use. For example, the production wastewater drainage system collects clean wastewater from the demineralized water station and wastewater from various circulating water systems, sending it to the production wastewater treatment plant; the domestic sewage drainage system collects wastewater from all plant facilities, sending it to the domestic sewage treatment plant; and the waste acid and acidic wastewater drainage system collects waste acid from the flue gas acid production process and acidic wastewater from various processes, sending it to the waste acid and acidic wastewater treatment plant. The treated water from each wastewater treatment plant is then reused by different water-using units. However, this approach does not consider cascade utilization, directly discharging wastewater to various wastewater treatment plants, resulting in large wastewater volumes, large-scale wastewater treatment plants, and the need to increase the water recovery rate of the membrane concentration section, increasing the difficulty of wastewater treatment, and raising investment and operating costs, ultimately leading to insignificant environmental benefits. Utility Model Content

[0004] The main purpose of this utility model is to provide a wastewater quality collection and cascade reuse system for copper smelters. By dividing the water used in the process units of the whole plant into several water-using units according to different water quality, the system can directly utilize the wastewater generated by each level of water-using unit in a sequential and cascade manner, comprehensively optimize the water balance of the whole plant, reduce the scale of wastewater treatment in copper smelters, improve the recycling rate of wastewater, and reduce investment and operating costs.

[0005] To achieve the above objectives, this utility model provides a wastewater separation collection and cascade reuse system for copper smelters, comprising the following steps: The system includes several water-using units divided according to the different water qualities of the entire plant's process water, including a first-stage water-using unit, a second-stage water-using unit, a third-stage water-using unit, and a final-stage water-using unit; as well as a wastewater separation treatment unit and a flue gas acid production unit. The wastewater separation treatment unit is used to separate and treat the domestic sewage generated by the entire plant's living facilities in the first-stage water-using unit, the remaining general production wastewater supplied by the second-stage water-using unit, the acidic wastewater generated by the flue gas acid production unit and the acidic wastewater generated from the treatment of waste acid, and the initial rainwater. The treated water is reused as recycled water in the final-stage water-using unit and other water-using units.

[0006] The second-level water-using unit includes various circulating water stations, which are connected to the demineralized water station and the sulfur dioxide fan cooling unit in the first-level water-using unit to recycle the clean wastewater discharged from the demineralized water station and the direct cooling water discharged from the sulfur dioxide fan cooling unit.

[0007] The third-level water-using unit includes a casting circulating water unit, which is connected to the second-level water-using unit to recycle and utilize the general production wastewater produced by the second-level water-using unit.

[0008] The ultimate water unit includes a slag cooling field, a flue gas blowing slag granulation unit, a ground washing water unit for the acid production section, a flue gas purification process water supply unit, and a greening and road watering water unit. It is connected to the wastewater separation treatment unit and the second-level water unit to recycle and utilize the recycled water treated by the wastewater separation treatment unit and the general production wastewater produced by the second-level water unit.

[0009] The ultimate water unit includes a slag cooling field, a flue gas blowing slag granulation unit, a ground washing water unit for the acid production section, a water supply unit for the flue gas purification process, and a water unit for greening and road watering. It is connected to the wastewater separation treatment unit and the secondary water unit to recycle and utilize the recycled water treated by the wastewater separation treatment unit and the general production wastewater produced by the secondary water unit.

[0010] Furthermore, the wastewater separation treatment unit includes a domestic sewage treatment plant, a production wastewater pretreatment system, a production wastewater deep treatment system, and an acidic wastewater treatment plant;

[0011] The domestic sewage treatment plant is used to treat the domestic sewage from the plant's living facilities to obtain reclaimed water.

[0012] The production wastewater pretreatment system is used to pretreat the remaining general production wastewater supplied by the second-stage water-using unit and the initial rainwater in the plant area to obtain pretreated water.

[0013] The wastewater deep treatment system is used to perform deep wastewater treatment on the pretreated water to obtain high-salt reclaimed water and high-quality reclaimed water;

[0014] The acidic wastewater treatment station is used to treat acidic wastewater generated from flue gas acid production, acidic wastewater generated from waste acid treatment, and initial rainwater from the sulfuric acid zone to obtain primary recycled water.

[0015] Furthermore, the slag slow cooling field is connected to the wastewater deep treatment system to recycle high-salt reclaimed water. The slag slow cooling field is also connected to the acidic wastewater treatment station and the second-stage water use unit to receive primary reclaimed water and general production wastewater to supplement the insufficient supply of high-salt reclaimed water.

[0016] Furthermore, the granulation unit for blown slag, the ground flushing water unit for the acid production section, and the water supply unit for the flue gas purification process are connected to the acidic wastewater treatment station to recycle and reuse primary recycled water.

[0017] Furthermore, the greening and road watering unit, together with the domestic sewage treatment plant and the production wastewater pretreatment system, is used to recycle and reuse greywater and pretreated water.

[0018] Furthermore, the waste heat boiler in the first-stage water unit is connected to the demineralized water station to receive the demineralized water discharged from the demineralized water station; wherein, the demineralized water station includes an ultrafiltration-reverse osmosis or ion exchange device for producing demineralized water.

[0019] Furthermore, the secondary water unit includes a furnace body circulating water station, an equipment circulating water station, an oxygen station circulating water station, a waste heat power generation circulating water station, and an acid production circulating water station; the acid production circulating water station is connected to the sulfur dioxide fan cooling unit; the furnace body circulating water station, equipment circulating water station, oxygen station circulating water station, and waste heat power generation circulating water station are all connected to the casting circulating water unit, and are also all connected to the slag slow cooling field.

[0020] Furthermore, the production wastewater pretreatment system includes a hardening removal unit, a coagulation unit, a sedimentation unit, a filtration unit, and a disinfection unit connected in sequence.

[0021] Furthermore, the domestic wastewater treatment plant includes a bar screen unit, a denitrification unit, an A / O biological contact oxidation unit, a sedimentation unit, a filtration unit, and a disinfection unit connected in sequence.

[0022] Furthermore, the advanced wastewater treatment system includes an ultrafiltration unit and a two-stage reverse osmosis unit connected in sequence.

[0023] Furthermore, the acidic wastewater treatment station includes a lime-iron salt heavy metal removal unit, an aluminum salt fluoride removal unit, and an electrochemical treatment unit connected in sequence.

[0024] Compared with existing technologies, this utility model has the following advantages: The system provided by this utility model divides the water use units into several water-using units according to the different water quality of the entire plant's process units. Under the premise of meeting their water quality requirements, each water-using unit prioritizes the use of water of lower quality level, and the remaining part is supplemented by water of higher quality level. The discharged water in the system is preferentially directly reused in the water-using units, and the remaining part is discharged to the corresponding wastewater treatment station for separate treatment. The treated water is then reused in the respective water-using units, achieving zero discharge. By classifying the water-using units of the copper smelter and using the wastewater separation and treatment unit to collect, treat and reuse the wastewater in a separate manner, the system realizes the separation of clean and dirty water, separate treatment, separate reuse and tiered utilization of the entire plant's water system. This reduces the scale of wastewater treatment, simplifies the wastewater collection network, and comprehensively optimizes the water supply and drainage balance of the entire plant. It has advantages such as high water recycling rate, low engineering and operating costs, energy saving and environmental protection. Attached Figure Description

[0025] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0026] Figure 1 This invention illustrates a schematic diagram of a copper smelter wastewater separation collection and cascade reuse system according to an embodiment of this application.

[0027] Figure 2 A flow chart illustrating the water balance of a wastewater treatment system based on the copper smelter wastewater separation collection and cascade reuse system according to an embodiment of this application is shown.

[0028] Figure 3 The diagram shows the water balance flow chart of the wastewater treatment method for wastewater collection and reuse in copper smelting plants adopted in the comparative example of this application. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0030] Example 1

[0031] A wastewater separation and cascade reuse system for copper smelters, referring to Figure 1 The system includes a first-stage water use unit, a second-stage water use unit, a third-stage water use unit, a final-stage water use unit, and a wastewater separation and treatment unit.

[0032] The wastewater treatment unit includes a domestic sewage treatment plant, a production wastewater pretreatment system, a production wastewater advanced treatment system, and an acidic wastewater treatment plant. The domestic sewage treatment plant treats domestic sewage from all plant facilities to produce reclaimed water. The production wastewater pretreatment system pretreats the remaining general production wastewater supplied by the secondary water-using units and the initial rainwater from the plant area to produce pretreated water. The advanced wastewater treatment system further treats the pretreated water to produce high-salt and high-quality reclaimed water. The acidic wastewater treatment plant treats acidic wastewater generated from flue gas sulfuric acid production, acidic wastewater from the waste acid treatment plant, and initial rainwater from the sulfuric acid zone to produce primary reclaimed water.

[0033] The domestic wastewater treatment plant includes, in sequence, a bar screen unit, a denitrification unit, an A / O biological contact oxidation unit, a sedimentation unit, a filtration unit, and a disinfection unit. The industrial wastewater pretreatment system includes, in sequence, a hardening removal unit, a coagulation unit, a sedimentation unit, a filtration unit, and a disinfection unit. The industrial wastewater advanced treatment system includes, in sequence, an ultrafiltration unit and a two-stage reverse osmosis unit. The acidic wastewater treatment plant includes, in sequence, a lime-iron salt heavy metal removal unit, an aluminum salt fluoride removal unit, and an electrochemical treatment unit.

[0034] The first-level water-using unit consists of a demineralized water station, a waste heat boiler, all plant living facilities, and a sulfur dioxide fan cooling unit. The demineralized water station and the sulfur dioxide fan cooling unit are connected to the wastewater deep treatment system to recycle high-quality reclaimed water. The waste heat boiler is connected to the demineralized water station to receive the demineralized water discharged from the demineralized water station. The demineralized water station includes ultrafiltration-reverse osmosis or ion exchange devices to produce demineralized water. All plant living facilities are connected to the domestic sewage treatment station.

[0035] The second-level water-using unit includes various circulating water stations, including furnace body circulating water station, equipment circulating water station, oxygen station circulating water station, waste heat power generation circulating water station, and acid production circulating water station. The furnace body circulating water station, equipment circulating water station, oxygen station circulating water station, and waste heat power generation circulating water station are all connected to the demineralized water station to recycle and utilize the clean wastewater discharged from the demineralized water station. The acid production circulating water station is connected to the sulfur dioxide fan cooling unit to recycle and utilize the direct cooling water discharged from the sulfur dioxide fan cooling unit.

[0036] The third-level water-using unit is the casting circulating water unit, which is connected to the second-level water-using unit to recycle and utilize the general production wastewater produced by the second-level water-using unit.

[0037] The final water supply unit includes a slag cooling yard, a flue gas blowing slag granulation unit, a sulfuric acid production section floor washing water unit, a flue gas purification process water supply unit, and a landscaping and road watering unit. The slag cooling yard is connected to the wastewater deep treatment system to recycle high-salt recycled water. The slag cooling yard is also connected to the acidic wastewater treatment plant and the second-stage water supply unit to receive primary recycled water and general production wastewater to supplement the insufficient supply of high-salt recycled water. The blowing slag granulation unit, the sulfuric acid production section floor washing water unit, and the flue gas purification process water supply unit are connected to the acidic wastewater treatment plant to recycle primary recycled water. The landscaping and road watering unit is connected to the domestic sewage treatment plant and the production wastewater pretreatment system to recycle reclaimed water and pretreated water.

[0038] Example 2

[0039] A copper smelter uses the copper smelter wastewater separation collection and cascade reuse system of Example 1 of this application for wastewater treatment, and its process is as follows: Figure 2 The implementation process is as follows:

[0040] The copper smelter's process units are divided into primary water-using units, secondary water-using units, tertiary water-using units, and final water-using units according to the different water quality. The primary water-using units include the demineralized water station, waste heat boiler, plant-wide living facilities, and sulfur dioxide fan cooling unit. The secondary water-using units include various circulating water stations, including furnace circulating water station, equipment circulating water station, oxygen station circulating water station, waste heat power generation circulating water station, and acid production circulating water station. The tertiary water-using unit is the casting circulating water unit. The final water-using units include the slag slow cooling field, the blowing slag granulation unit, the acid production section ground washing water unit, the flue gas purification process water supply unit, and the greening and road watering water unit.

[0041] The plant's water supply system consists of: fresh production water, domestic water, demineralized water, and high-quality reclaimed water, primary reclaimed water, greywater reclaimed water, and high-salt reclaimed water after wastewater treatment. The plant's drainage system consists of: clean wastewater from the demineralized water station, direct cooling water discharged from the sulfur dioxide fan cooling unit, general production wastewater from various circulating water stations, domestic sewage from the plant's living facilities, acidic wastewater from flue gas acid production, acidic wastewater from waste acid treatment, and initial rainwater.

[0042] The demineralized water station and sulfur dioxide fan cooling unit use fresh production water or high-quality recycled water as their water source. All plant living facilities use domestic water supply as their water source, and the waste heat boiler uses demineralized water as its water source. Various circulating water stations are supplied with clean wastewater and direct-flow cooling water, with any shortfall supplemented by fresh production water. Casting circulating water uses general production wastewater from the secondary water-using unit as its water source. Specifically, the slag cooling yard uses high-salt recycled water, with any shortfall supplemented by primary recycled water; the blowing slag granulation unit, acid production section floor washing water, waste acid and acidic wastewater treatment agent preparation water, and flue gas purification process water use primary recycled water; and landscaping and road watering water uses greywater recycled water.

[0043] In this embodiment, the 1300m³ of demineralized water from the first-stage water-using unit is used. 3 / d of water is used for desalination, and 335m³ of water is discharged. 3 / d Clean wastewater is supplied to the boiler circulating water station, equipment circulating water station, oxygen station circulating water station, and waste heat power generation circulating water station for recycling, and then used in an 8500m³ process. 3 / d Fresh water is produced to replenish the water supply, generating 1250m³ 3 / d of general production wastewater; 965m³ of wastewater discharged from the demineralized water station 3 The demineralized water is supplied to waste heat boilers (including smelting waste heat boilers and acid conversion waste heat boilers). Since the impurities in the concentrated water discharged from the demineralized water station are only the enrichment of salt in municipal water and do not contain other pollutants, it can be used as clean wastewater. Its water quality meets the requirements of GB19923-2024 "Urban Wastewater Reuse - Industrial Water Quality" standard and can be directly supplied to the circulating water station for use.

[0044] 1920m 3 The fresh water produced per day is supplied to the cooling unit of the sulfur dioxide fan. After the cooling process is complete, the 1920m³ of water discharged is used to cool the sulfur dioxide fan. 3 / d of DC cooling water is supplied to the acid production circulating water station for recycling, and then 2320m 3 / d of fresh production water is used to replenish the production, producing 570m³ 3 / d of general production wastewater.

[0045] The 500m generated by the second-level water unit 3 / d General production wastewater is supplied to the casting circulating water unit for recycling. Since the casting circulating water unit (referring to the circulating water for disc casting in the copper smelting process) is a turbid circulation system, the water quality requirements for production are relatively low. The wastewater discharged from the indirect cooling open-loop circulating cooling water system (circulating water station) can be used as supplementary water for the casting circulation, which can greatly reduce the amount of general production wastewater entering the wastewater treatment plant and reduce the size of the wastewater treatment plant. The generated 350m³ 3 / d General production wastewater is supplied to the slag cooling yard for recycling, and then the remaining 970m³ 3 / d General production wastewater and initial rainwater from the plant area undergo pretreatment. The pretreatment process employs hardening removal, coagulation, sedimentation, filtration, and disinfection to obtain pretreated water. 900m³ 3 A portion of the pretreated water is then subjected to advanced wastewater treatment, which employs an ultrafiltration-two-stage reverse osmosis process to obtain 200m³ of wastewater. 3 / d of high-salinity recycled water and 700m 3 / d of high-quality recycled water. 200m³ 3 / d of high-salinity recycled water is supplied to the slag slow cooling field for recycling, and 700m 3 High-quality recycled water is supplied daily to the demineralized water plant for reuse. Pretreated water undergoes advanced wastewater treatment, and the resulting reverse osmosis permeate can replace fresh production water as high-quality recycled water, which is then reused as raw water in the demineralized water plant. The main pollutant in the reverse osmosis concentrate is salt, meeting the requirements of GB 25467-2010 "Emission Standard of Pollutants from Copper, Nickel and Cobalt Industries," and can be used as high-salt recycled water in the slag cooling field.

[0046] 150m 3 / d of domestic water supply is provided to all living facilities in the plant, generating 130m³ 3 / d domestic sewage, 130m 3 / d Domestic sewage is sent to a domestic sewage treatment plant for treatment, yielding 130m³ 3 / d of reclaimed water for domestic wastewater treatment, the wastewater treatment plant adopts a process of screen-denitrification-A / O biological contact oxidation-sedimentation-filtration-disinfection. The treated water meets the requirements of GBT18920-2020 "Water Quality Standard for Reclaimed Urban Wastewater for Urban Miscellaneous Use". 130m³ 3 / d Reclaimed water is used for landscaping and road watering, while 70m³ of untreated wastewater is also used for other purposes. 3 The pretreated water per day is also used as recycled water for landscaping and road watering.

[0047] The waste acid discharged from the flue gas sulfuric acid production section is treated by sulfidation for arsenic removal and lime neutralization at the waste acid treatment station. The resulting acidic wastewater, along with the acidic wastewater from the flue gas sulfuric acid production section and the initial rainwater from the sulfuric acid zone, is then sent to the acidic wastewater treatment station for further treatment. The acidic wastewater treatment station employs a lime-iron salt heavy metal removal-aluminum salt fluoride removal-electrochemical treatment process to remove heavy metals and other impurities from the wastewater and to neutralize the wastewater, yielding 1650m³ of treated wastewater. 3 / d of primary recycled water, the treated primary recycled water meets the requirements of GB 25467-2010 "Emission Standard of Pollutants for Copper, Nickel and Cobalt Industries". The resulting 1650m³3 / d Primary recycled water is supplied to the slag cooling yard (650m) 3 / d), blowing slag granulation unit (100m 3 / d), Sulfuric acid production section floor flushing water unit (10m 3 / d) and flue gas purification process water supply unit (890m 3 / d)

[0048] Comparative Example 1

[0049] A copper smelter uses a wastewater treatment method involving the classified collection and reuse of wastewater. The process is as follows: Figure 3 The implementation process is as follows:

[0050] 13340m 3 / d Fresh water produced is supplied to the demineralized water station (600m³) 3 / d), sulfur dioxide fan cooling unit (1920m) 3 / d), Casting circulating water unit (500m 3 / d) and various circulating water stations (10320m 3 / d) In this context, the furnace body circulating water station, equipment circulating water station, oxygen station circulating water station, and waste heat power generation circulating water station together supply 8000m³ of water. 3 / d, the acid production circulating water station supplies 2320m³ 3 / d, and uses a sulfur dioxide fan cooling unit to discharge 1920m 3 / d DC cooling water is supplied to the acid production circulating water station.

[0051] The 1820m³ produced by various circulating water stations 3 / d General industrial wastewater, 335m³ produced by the demineralization station 3 / d Clean wastewater and initial rainwater from the factory area undergo pretreatment to obtain 2155m³ of industrial wastewater. 3 / d pretreated water. 2085m³ 3 A portion of the pretreated water per day undergoes advanced wastewater treatment to obtain 550m³ of wastewater. 3 / d of high-salinity recycled water and 1535m 3 / d of high-quality recycled water. 550m³ 3 / d of high-salinity recycled water is supplied to the slag slow cooling field for recycling, and 1535m 3 The high-quality recycled water is supplied to the demineralized water station (700m³ / d) respectively. 3 / d) Neutralizing various circulating water stations (835 m 3 The 965m³ discharged from the demineralized water station will be reused in the / d) process. 3 / d demineralized water is supplied to waste heat boilers (including smelting waste heat boilers and acid conversion waste heat boilers).

[0052] 150m 3 / d of domestic water supply is provided to all living facilities in the plant, generating 130m³ 3 / d domestic sewage, 130m 3 / d Domestic sewage is sent to a domestic sewage treatment plant for treatment, yielding 130m³ 3 / d of recycled water, while simultaneously treating 70m³ of untreated wastewater. 3 The pretreated water per day is also used as recycled water for landscaping and road watering.

[0053] The waste acid discharged from the flue gas sulfuric acid production section is treated by sulfidation and arsenic removal and lime neutralization at the waste acid treatment station. The resulting acidic wastewater, along with the acidic wastewater from the flue gas sulfuric acid production section and the initial rainwater from the sulfuric acid zone, is then sent to the acidic wastewater treatment station for further acid waste treatment, yielding 1650m³ of treated wastewater. 3 / d primary recycled water. The resulting 1650m³ 3 / d Primary recycled water is supplied to the slag cooling yard (650m) 3 / d), blowing slag granulation unit (100m 3 / d), Sulfuric acid production section floor flushing water unit (10m 3 / d) and flue gas purification process water supply unit (890m 3 / d)

[0054] By dividing the water used in the entire plant's process units into several water-using units based on their different water qualities, the system directly utilizes the wastewater generated by each level of water-using unit in a sequential and tiered manner. The wastewater generated by the first level water-using unit is supplied to the second level water-using unit, and the wastewater generated by the second level water-using unit is supplied to the third level water-using unit. The wastewater discharged from the entire plant is then collected, treated, and reused in the water-using units according to its quality. This greatly reduces the scale of the wastewater treatment plant, simplifies the wastewater collection network, and comprehensively optimizes the plant's water supply and drainage balance. It has advantages such as high water recycling rate, low engineering and operating costs, energy saving, and environmental protection.

[0055] Based on the comparison of wastewater treatment capacity in the above comparative examples and embodiments, the wastewater pretreatment method in this embodiment only requires the treatment of 970 m³ of wastewater. 3 / d, while the comparative production wastewater pretreatment requires the treatment of 2155m³. 3 / d. Therefore, by adopting the wastewater treatment system for copper smelting plants described in this application, the treatment capacity of the production wastewater treatment plant is reduced by more than 50%, significantly lowering the investment and operating costs of wastewater treatment, resulting in good economic benefits.

[0056] The embodiments described above are merely illustrative of implementation methods of this utility model, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this utility model. This utility model can also be implemented in other specific ways or forms without departing from its spirit or essential characteristics. Therefore, the described embodiments should be considered illustrative rather than limiting in any respect. The scope of this utility model should be defined by the appended claims, and any variations equivalent to the intent and scope of the claims should also be included within the scope of this utility model.

Claims

1. A copper smelter wastewater multi-quality collection and cascade reuse system, characterized in that, The system includes several water-using units divided according to the different water quality of the entire plant's process water, including a first-level water-using unit, a second-level water-using unit, a third-level water-using unit, and a final-level water-using unit; as well as a wastewater separation and treatment unit and a flue gas acid production unit. The wastewater separation and treatment unit is used to collect and treat domestic sewage generated by the plant's living facilities in the first-level water-using unit, general production wastewater supplied by the second-level water-using unit, acidic wastewater generated by the flue gas acid production unit and acidic wastewater generated by treating waste acid, and initial rainwater separately. The treated water is reused as recycled water in the final-level water-using unit and other water-using units. The first-level water unit includes a demineralized water station, a waste heat boiler, plant living facilities, and a sulfur dioxide fan cooling unit, which is connected to the wastewater separation treatment unit to recycle the treated water. The second-level water-using unit includes various circulating water stations, which are connected to the demineralized water station and the sulfur dioxide fan cooling unit in the first-level water-using unit to recycle the clean wastewater discharged from the demineralized water station and the direct cooling water discharged from the sulfur dioxide fan cooling unit. The third-level water-using unit includes a casting circulating water unit, which is connected to the second-level water-using unit to recycle and utilize the general production wastewater produced by the second-level water-using unit. The ultimate water unit includes a slag cooling field, a flue gas blowing slag granulation unit, a ground washing water unit for the acid production section, a water supply unit for the flue gas purification process, and a water unit for greening and road watering. It is connected to the wastewater separation treatment unit and the secondary water unit to recycle and utilize the recycled water treated by the wastewater separation treatment unit and the general production wastewater produced by the secondary water unit.

2. The copper smelter wastewater quality-based collection and cascade reuse system according to claim 1, characterized in that, The wastewater separation treatment unit includes a domestic sewage treatment plant, a production wastewater pretreatment system, a production wastewater deep treatment system, and an acidic wastewater treatment plant. The domestic sewage treatment plant is used to treat the domestic sewage from the plant's living facilities to obtain reclaimed water. The production wastewater pretreatment system is used to pretreat the remaining general production wastewater supplied by the second-stage water-using unit and the initial rainwater in the plant area to obtain pretreated water. The wastewater deep treatment system is used to perform deep wastewater treatment on the pretreated water to obtain high-salt reclaimed water and high-quality reclaimed water; The acidic wastewater treatment station is used to treat acidic wastewater generated from flue gas acid production, acidic wastewater generated from waste acid treatment, and initial rainwater from the sulfuric acid zone to obtain primary recycled water.

3. The copper smelter wastewater quality-based collection and cascade reuse system according to claim 2, characterized in that, The slag slow cooling field is connected to the wastewater deep treatment system to recycle high-salt reclaimed water. The slag slow cooling field is also connected to the acidic wastewater treatment station and the second-stage water use unit to receive primary reclaimed water and general production wastewater to supplement the insufficient supply of high-salt reclaimed water.

4. The copper smelter wastewater quality-based collection and cascade reuse system according to claim 2, characterized in that, The granulation unit for blown slag, the ground flushing water unit for the acid production section, and the water supply unit for the flue gas purification process are connected to the acid wastewater treatment station to recycle and reuse primary recycled water. The greening and road watering unit, together with the domestic sewage treatment plant and the production wastewater pretreatment system, is used to recycle and reuse greywater and pretreated water.

5. The copper smelter wastewater quality based collection and cascade reuse system according to claim 2, wherein, The demineralized water station and sulfur dioxide fan cooling unit in the first-stage water unit are connected to the wastewater deep treatment system to recycle and reuse high-quality recycled water.

6. The copper smelter wastewater quality-based collection and cascade reuse system according to claim 1, characterized in that, The waste heat boiler in the first-stage water unit is connected to the demineralized water station to receive the demineralized water discharged from the demineralized water station; wherein, the demineralized water station includes an ultrafiltration-reverse osmosis or ion exchange device for producing demineralized water.

7. The copper smelter wastewater multi-quality collection and cascade reuse system according to claim 1, characterized in that, The secondary water-using units include a furnace body circulating water station, an equipment circulating water station, an oxygen station circulating water station, a waste heat power generation circulating water station, and an acid production circulating water station; The acid production circulating water station is connected to the sulfur dioxide fan cooling unit; The furnace body circulating water station, equipment circulating water station, oxygen station circulating water station, and waste heat power generation circulating water station are all connected to the casting circulating water unit, and are also connected to the slag slow cooling field.

8. The copper smelter wastewater multi-quality collection and cascade reuse system according to claim 2, characterized in that, The production wastewater pretreatment system includes a hardening removal unit, a coagulation unit, a sedimentation unit, a filtration unit, and a disinfection unit connected in sequence.

9. The copper smelter wastewater multi-quality collection and cascade reuse system according to claim 2, characterized in that, The domestic wastewater treatment plant includes a bar screen unit, a denitrification unit, an A / O biological contact oxidation unit, a sedimentation unit, a filtration unit, and a disinfection unit connected in sequence.

10. The copper smelter wastewater multi-quality collection and cascade reuse system according to claim 2, characterized in that, The advanced treatment system for production wastewater includes an ultrafiltration unit and two-stage reverse osmosis units connected in sequence. The acidic wastewater treatment station includes a lime-iron salt heavy metal removal unit, an aluminum salt fluoride removal unit, and an electrochemical treatment unit connected in sequence.

Images