A ternary precursor production wastewater recovery system

Abstract

The application discloses a kind of ternary precursor production wastewater recovery systems, including wastewater collection tank and heat recovery platform, wastewater collection tank is sequentially connected with high-temperature heavy metal wastewater chamber, medium-temperature heavy metal wastewater chamber, low-temperature heavy metal wastewater chamber and non-heavy metal wastewater chamber, and the high-temperature heavy metal wastewater chamber, medium-temperature heavy metal wastewater chamber and low-temperature heavy metal wastewater chamber are respectively provided with a precipitant injection channel, for inputting different precipitants, different metal elements are deposited and recovered standard in ladder form.The ternary precursor production wastewater recovery system provided by the application is divided into high-temperature heavy metal wastewater chamber, medium-temperature heavy metal wastewater chamber, low-temperature heavy metal wastewater chamber and non-heavy metal wastewater chamber in wastewater collection tank, wastewater is sequentially treated through four wastewater chambers, different metal elements are deposited and recovered in ladder form, and the recovery rate and recovery efficiency of heavy metals are improved.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a ternary precursor production wastewater recovery system. Background Technology

[0002] With the widespread application of ternary precursor materials in high-tech fields such as new energy and electronics, the wastewater generated during their production process has gradually attracted attention. This wastewater not only contains large amounts of heavy metals, such as nickel, cobalt, and manganese, but also carries a certain amount of heat energy. The usual treatment method for this type of wastewater is to inject a precipitant to precipitate the heavy metals and separate them from the wastewater. For example, Chinese Patent 201010191294.2 discloses a method for treating tungsten-containing wastewater in tungsten smelting, which involves chemical precipitation of pretreated tungsten-containing wastewater to recover tungsten from the wastewater.

[0003] Ternary precursor materials contain a variety of metals, and the heat energy contained in the wastewater and the heat energy generated during treatment will also be wasted. When traditional wastewater treatment methods are applied to the wastewater treatment process in the production of ternary precursor materials, there are problems such as low efficiency, low metal recovery rate and waste of heat energy. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a ternary precursor production wastewater recovery system to solve the technical problems of low efficiency, low metal recovery rate and waste of thermal energy in the treatment of wastewater generated during the production of ternary precursor materials in the prior art.

[0005] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0006] This invention provides a ternary precursor production wastewater recovery system, comprising:

[0007] The wastewater collection tank contains, in sequence, a high-temperature heavy metal wastewater chamber, a medium-temperature heavy metal wastewater chamber, a low-temperature heavy metal wastewater chamber, and a non-heavy metal wastewater chamber. Each of the high-temperature, medium-temperature, and low-temperature heavy metal wastewater chambers is equipped with a precipitant injection channel for adding different precipitants and performing stepwise precipitation and recovery of different metal elements. The non-heavy metal wastewater chamber is used for post-treatment of the wastewater to meet discharge standards.

[0008] A heat recovery platform is installed on the wastewater collection tank to recover and utilize wastewater and the heat generated during wastewater treatment.

[0009] In some embodiments, the heat recovery platform comprises a heat recovery device, an evaporation device and a heat exchange device, the evaporation device is arranged on the high-temperature heavy metal wastewater chamber for evaporating wastewater and introducing high-temperature steam into the heat recovery device for heat recovery, and the heat exchange device is arranged on the medium-temperature heavy metal wastewater chamber for heat exchange with the medium-temperature wastewater and introduction into the heat recovery device for heat recovery.

[0010] In some embodiments, the heat exchange device comprises a driving mechanism, a medium introduction assembly, a medium discharge assembly and a heat exchange coil, the active end of the driving mechanism is connected with the heat exchange coil for driving the heat exchange coil to rotate and stir in the medium-temperature heavy metal wastewater chamber, and the medium introduction assembly and the medium discharge assembly are respectively communicated with the liquid inlet and the liquid outlet of the heat exchange coil for introducing and discharging medium.

[0011] In some embodiments, the medium introduction assembly comprises a frame body, an annular tank and an introduction pipe, the annular tank is fixedly connected with the rotation shaft of the heat exchange coil on the frame body, one end of the introduction pipe is connected with the annular tank, and the other end is connected with the wastewater discharge pipeline of the non-heavy metal wastewater chamber for introducing the discharged wastewater into the annular tank, and the liquid inlet of the heat exchange coil is in U-shaped bending shape and is inserted into the annular tank downward.

[0012] In some embodiments, the annular tank comprises an annular seat and an annular cover, the introduction pipe is fixed on the top of the annular seat, the annular cover is rotatably connected on the top of the annular seat for covering and sealing the opening part of the annular seat, and the liquid inlet of the heat exchange coil is connected on the annular cover.

[0013] In some embodiments, the medium discharge assembly comprises a rotary joint, a pump body and a discharge pipe, the rotary joint is fixedly connected with the rotation shaft of the heat exchange coil on the frame body, the liquid outlet of the heat exchange coil is connected with the rotating end of the rotary joint through the annular hollow of the annular tank, the other end of the rotary joint is connected with the pump body, and the pump body is connected with the heat recovery device through the discharge pipe.

[0014] In some embodiments, the heat exchange coil is in plurality, the plurality of heat exchange coils are arranged in a circle around the rotation axis, and the liquid outlets of the plurality of heat exchange coils are connected with the rotating end of the rotary joint through the straight pipes.

[0015] In some embodiments, the driving mechanism comprises a driving motor, an annular gear and a driving gear, the annular gear is sleeved and fixed on the outside of the straight pipe, and the driving gear is connected with the output shaft of the driving motor and engaged with the annular gear.

[0016] In some embodiments, the evaporation device comprises a heating device installed on the high-temperature heavy metal wastewater chamber for heating the wastewater, and an evaporation pipeline connected at one end to the high-temperature heavy metal wastewater chamber and at the other end to the heat recovery device.

[0017] In some embodiments, the heat recovery device is provided with a first discharge pipe and a second discharge pipe, the first discharge pipe being used to discharge steam condensate to the non-heavy metal wastewater chamber, and the second discharge pipe being used to discharge medium liquid passing through the heat exchange device to the outside.

[0018] Compared with the prior art, the ternary precursor production wastewater recovery system provided by the present application can improve the recovery rate and efficiency of heavy metals by sequentially treating wastewater through four wastewater chambers, i.e., a high-temperature heavy metal wastewater chamber, a medium-temperature heavy metal wastewater chamber, a low-temperature heavy metal wastewater chamber, and a non-heavy metal wastewater chamber, and by using a heat recovery platform to recover and utilize the heat generated by the wastewater and the wastewater treatment, thereby avoiding heat energy waste. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic diagram of the ternary precursor production wastewater recovery system provided by the embodiments of the present application;

[0020] Figure 2 is a three-dimensional diagram of the heat exchange device of the ternary precursor production wastewater recovery system provided by the embodiments of the present application;

[0021] Figure 3 is a three-dimensional exploded diagram of the ternary precursor production wastewater recovery system provided by the embodiments of the present application. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0023] In order to solve the technical problems of low efficiency, low metal recovery rate and heat energy waste in the treatment of wastewater generated in the production process of ternary precursor materials, the present application provides a ternary precursor production wastewater recovery system, which can realize efficient recovery of metals and utilization of heat in the wastewater generated in the production process of ternary precursor materials.

[0024] It should be noted that the three-precursor production wastewater recovery system is used for, but not limited to, three-precursor production wastewater recovery, and in order to facilitate the description, in the present application, only the three-precursor production wastewater recovery system is applied to three-precursor production wastewater recovery as an example for description, and the principle of the three-precursor production wastewater recovery system applied to other types of equipment and the principle of the three-precursor production wastewater recovery system applied to other wastewater containing heavy metals are substantially the same, which will not be described here.

[0025] Please refer to Figure 1 , Figure 1 is a structural schematic diagram of the three-precursor production wastewater recovery system in an embodiment of the present application, the three-precursor production wastewater recovery system comprises a wastewater collection tank 1 and a heat recovery platform, the wastewater collection tank 1 is provided with a high-temperature heavy metal wastewater chamber 11, a medium-temperature heavy metal wastewater chamber 12, a low-temperature heavy metal wastewater chamber 13 and a non-heavy metal wastewater chamber 14 in sequence, and a precipitant injection channel 101 is arranged on each of the high-temperature heavy metal wastewater chamber 11, the medium-temperature heavy metal wastewater chamber 12 and the low-temperature heavy metal wastewater chamber 13, which is used for inputting different precipitants to precipitate and recover different metal elements in a ladder type, and the non-heavy metal wastewater chamber 14 is used for post-treatment of wastewater to discharge standard, specifically, each wastewater chamber is provided with a water inlet and a water outlet, and a temperature sensor is arranged in the chamber, and a metal content detector is arranged at the water inlet and the water outlet, and the water flow rate, the type and the flow of the precipitants are adjusted according to the detection results, wherein the production wastewater is introduced from the water inlet of the high-temperature heavy metal wastewater chamber 11, and then sequentially treated in the four wastewater chambers to reach the discharge standard; the heat recovery platform is arranged on the wastewater collection tank 1, and is used for recycling the heat generated by the wastewater and the wastewater treatment.

[0026] In the embodiment, the high-temperature heavy metal wastewater chamber 11 is used for heating and evaporating the wastewater and adding a first precipitant to recover nickel metal, the medium-temperature heavy metal wastewater chamber 12 is used for adding a second precipitant to recover cobalt metal, the low-temperature heavy metal wastewater chamber 13 is used for adding a third precipitant to recover manganese metal, and the non-heavy metal wastewater chamber 14 is used for treating the non-heavy metal wastewater to reach the discharge standard, wherein the non-heavy metal wastewater chamber 14 can perform traditional treatment steps such as precipitation, filtration and ion exchange on the non-heavy metal wastewater to reach the discharge standard.

[0027] In one of the embodiments, please refer to Figure 1, in order to improve the recovery efficiency and recycle the heat in the ternary precursor production wastewater recovery system, the heat recovery platform includes a heat recovery device 2, an evaporation device 3 and a heat exchange device 4. The evaporation device 3 is arranged on the high-temperature heavy metal wastewater chamber 11, which is used for evaporating wastewater and introducing high-temperature steam into the heat recovery device 2 for heat recovery. High-temperature evaporation evaporates the water in the wastewater by heating, thereby increasing the concentration of metal ions. The concentrated metal solution is easier to be processed subsequently, reducing the processing volume and the cost and difficulty of subsequent processing. After high-temperature evaporation treatment, the wastewater still has a large amount of heat energy, so the heat exchange device 4 is arranged on the medium-temperature heavy metal wastewater chamber 12, which is used for heat exchange with the medium-temperature wastewater discharged from the non-heavy metal wastewater chamber 14 and introduced into the heat recovery device 2 for heat recovery. The non-heavy metal wastewater chamber 14 discharges wastewater that meets the standard of water source that can be discharged to the outside, which can be used as a heat exchange medium, saving water resources, and the water source at this place has been reduced to room temperature, which can be used for heat exchange with the wastewater in the medium-temperature heavy metal wastewater chamber 12 with higher temperature in the recycling process.

[0028] In this embodiment, the heat recovery device 2 mainly includes a heat exchanger for recovering heat energy from high-temperature steam, and a plate heat exchanger for recovering heat energy from medium-temperature heavy metal wastewater chamber 12 heat exchange medium water. The two heat exchangers have separate channels.

[0029] Among them, the heat recovery device 2 is provided with a first discharge pipe 201 and a second discharge pipe 202, the first discharge pipe 201 is used to discharge steam condensate to the non-heavy metal wastewater chamber 14, and the second discharge pipe 202 is used to discharge the medium liquid through the heat exchange device 4 to the outside.

[0030] It can be understood that heat energy can be converted into electric energy or directly used in the production system.

[0031] In one embodiment, please refer to Figure 1 and Figure 2, in order to accelerate the precipitation in the medium temperature heavy metal wastewater chamber 12 and the high efficiency heat exchange of large coverage area, both the mixing speed of the precipitator and the wastewater and the heat exchange efficiency are improved, the heat exchange device 4 includes a driving mechanism 41, a medium introduction assembly 42, a medium export assembly 43 and a heat exchange coil 44. The movable end of the driving mechanism 41 is connected with the heat exchange coil 44, which is used to drive the heat exchange coil 44 to rotate and stir in the medium temperature heavy metal wastewater chamber 12, the medium introduction assembly 42 and the medium export assembly 43 are respectively communicated with the liquid inlet and the liquid outlet of the heat exchange coil 44, which are respectively used for introducing and exporting medium, so as to save the stirring mechanism in the traditional wastewater treatment tank, the heat exchange coil 44 is used as the stirring part, the coverage of the stirring part is wide, at the same time, the whole wastewater chamber has a larger heat exchange area, which achieves the purpose of improving both the mixing speed of the precipitator and the wastewater and the heat exchange efficiency.

[0032] Further, in order to achieve the purpose of rotating and introducing medium into the heat exchange coil 44, the medium introduction assembly 42 includes a frame body 421, an annular tank 422 and an introduction pipe 423, the frame body 421 is fixed on the ceiling, or an external support, which is suspended above the wastewater collecting tank 1. The annular tank 422 is coaxially fixed on the frame body 421 with the rotating shaft of the heat exchange coil 44, the annular tank 422 is annular, hollow inside, and has a hole passing through up and down in the middle of the annular tank. One end of the introduction pipe 423 is connected to the annular tank 422, and the other end is connected to the wastewater discharge pipeline of the non-heavy metal wastewater chamber 14, which is used to introduce the discharged wastewater after treatment into the annular tank 422, and the wastewater as heat exchange medium can be introduced into the annular tank 422, and a pump body can be used to transport the wastewater discharged from the non-heavy metal wastewater chamber 14. The liquid inlet of the heat exchange coil 44 is U-shaped and is inserted into the annular tank 422 downward, and can rotate along the axis of the annular tank 422, and the wastewater as heat exchange medium is extracted from the annular tank 422 to the heat exchange coil 44 to flow, so as to solve the purpose of introducing medium liquid in rotation.

[0033] Further, in order to avoid the leakage of the waste water as the heat exchange medium, the ring-shaped tank 422 includes a ring-shaped seat 4221 and a ring-shaped cover 4222. The inlet pipe 423 is fixed on the top of the ring-shaped seat 4221, i.e. outside the range of the ring-shaped cover 4222. The ring-shaped cover 4222 is rotatably connected on the top of the ring-shaped seat 4221, and a sealing ring is arranged between the ring-shaped cover 4222 and the ring-shaped seat 4221 for covering and sealing the opening of the ring-shaped seat 4221. The inlet of the heat exchange coil 44 is connected to the ring-shaped cover 4222, so that when the heat exchange coil 44 rotates along the axis, the ring-shaped cover 4222 rotates with the heat exchange coil 44, and the opening of the ring-shaped seat 4221 is covered and sealed during the rotation.

[0034] Further, in order to achieve the rotation of the medium to the heat recovery device 2, the medium outlet assembly 43 includes a rotary joint 431, a pump body 432 and an exhaust pipe 433. The rotary joint 431 is coaxially fixed to the rotary shaft of the heat exchange coil 44 and is connected to the bottom of the frame 421. The outlet of the heat exchange coil 44 is connected to the rotating end of the rotary joint 431 through the ring-shaped hollow of the ring-shaped tank 422, so that the outlet rotates in the ring-shaped hollow and does not interfere with other components during rotation. The other end of the rotary joint 431 is connected to the pump body 432, and the pump body 432 is connected to the heat recovery device 2 through the exhaust pipe 433. The pump body 432 provides suction force to the waste water as the heat exchange medium, which is sucked into the heat exchange coil 44 from the ring-shaped tank 422, flows through the entire heat exchange coil 44, and then passes through the rotary joint 431, so that the rotary joint 431 is connected to the heat recovery device 2 through the exhaust pipe 433 for heat recovery.

[0035] In one embodiment, as shown in Figure 2 and Figure 3 In order to uniformly distribute the heat exchange coil 44, the number of heat exchange coils 44 is multiple, and the multiple heat exchange coils 44 are arranged in a circle around the rotary axis. The outlets of the multiple heat exchange coils 44 are connected to the rotating end of the rotary joint 431 through straight pipes 4401, which are used to collect and communicate the outlets of the multiple heat exchange coils 44 for effective connection and communication with the rotary joint 431.

[0036] It can be understood that the main shape of the heat exchange coil 44 is U-shaped, and the shape of the heat exchange coil 44 can also be serpentine with multiple bends. The inlet and outlet of the heat exchange coil 44 do not interfere with other components during rotation. The inlet of the heat exchange coil 44 is a U-shaped pipe, and the outlet of the heat exchange coil 44 is a vertical pipe.

[0037] In one embodiment, as shown in Figure 2 andFigure 3 In order to drive the rotation of the multiple evenly distributed heat exchange coils 44, the driving mechanism 41 comprises a driving motor 411, a ring gear 412 and a driving gear 413, the ring gear 412 is fixedly sleeved on the outside of the straight pipe 4401, the driving gear 413 is connected with the output shaft of the driving motor 411 and is engaged with the ring gear 412, the driving motor 411 drives the rotation of the driving gear 413, the driving gear 413 drives the rotation of the ring gear 412, the ring gear 412 drives the rotation of the straight pipe 4401, and the straight pipe 4401 drives the rotation of the multiple heat exchange coils 44.

[0038] In one embodiment, please refer to Figure 1 In order to evaporate the wastewater in the high-temperature heavy metal wastewater chamber 11, the evaporation device 3 comprises a heating device 31 and an evaporation pipeline 32, the heating device 31 is installed on the high-temperature heavy metal wastewater chamber 11 and is used for heating the wastewater, one end of the evaporation pipeline 32 is connected with the high-temperature heavy metal wastewater chamber 11, and the other end is connected with the heat recovery device 2.

[0039] It can be understood that the heating device 31 can be an electric heating device or a combustion heating device, which can heat the wastewater to generate high-temperature steam, and the present application is not limited to this.

[0040] In order to better understand the present application, the following will be combined Figures 1 to 3 The technical scheme of the present application is described in detail: the production wastewater is introduced into the high-temperature heavy metal wastewater chamber 11, high-temperature steam is generated under the heating of the heating device 31, and is guided to the heat recovery device 2 through the evaporation pipeline 32 to recover the heat energy, and at the same time, a precipitating agent is added to precipitate the nickel metal ions; the wastewater treated by the high-temperature heavy metal wastewater chamber 11 is introduced into the medium-temperature heavy metal wastewater chamber 12, and at the same time, a precipitating agent is added to precipitate the cobalt metal ions, the wastewater and the added precipitating agent are mixed through the rotation of the heat exchange device 4, and at the same time, the wastewater is heat exchanged to carry the heat energy to the heat recovery device 2 to recover the heat energy; the wastewater treated by the medium-temperature heavy metal wastewater chamber 12 is introduced into the low-temperature heavy metal wastewater chamber 13, and at the same time, a precipitating agent is added to precipitate the manganese metal ions; finally, the wastewater treated by the low-temperature heavy metal wastewater chamber 13 is introduced into the non-heavy metal wastewater chamber 14 for post-treatment to reach the discharge standard, and the wastewater is introduced into the heat exchange device 4 as a heat exchange medium and is discharged after the heat energy is recovered by the heat recovery device 2.

[0041] The specific embodiments of the present application described above do not constitute a limitation on the protection scope of the present application. Any various other corresponding changes and modifications made according to the technical concept of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A ternary precursor production wastewater recovery system, characterized in that, include: The wastewater collection tank is equipped with a high-temperature heavy metal wastewater chamber, a medium-temperature heavy metal wastewater chamber, a low-temperature heavy metal wastewater chamber, and a non-heavy metal wastewater chamber connected in sequence. Each of the high-temperature heavy metal wastewater chamber, the medium-temperature heavy metal wastewater chamber, and the low-temperature heavy metal wastewater chamber is provided with a precipitant injection channel for adding different precipitants and precipitating and recovering different metal elements in a stepwise manner. The non-heavy metal wastewater chamber is used for post-treatment of wastewater to meet discharge standards. as well as A heat recovery platform is installed on the wastewater collection tank to recover and utilize wastewater and the heat generated during wastewater treatment. The heat recovery platform includes a heat recovery device, an evaporation device, and a heat exchange device. The evaporation device is located on the high-temperature heavy metal wastewater chamber and is used to evaporate the wastewater and introduce the high-temperature steam into the heat recovery device for heat recovery. The heat exchange device is located on the medium-temperature heavy metal wastewater chamber and is used to exchange heat with the medium-temperature wastewater using the wastewater discharged from the non-heavy metal wastewater chamber as a medium and introduce it into the heat recovery device for heat recovery. The heat exchange device includes a drive mechanism, a medium inlet component, a medium outlet component, and a heat exchange coil. The movable end of the drive mechanism is connected to the heat exchange coil and is used to drive the heat exchange coil to rotate and stir in the medium-temperature heavy metal wastewater chamber. The medium inlet component and the medium outlet component are respectively connected to the liquid inlet and liquid outlet of the heat exchange coil and are used to introduce and discharge the medium, respectively. The medium introduction assembly includes a frame, an annular tank, and an inlet pipe. The annular tank is coaxially and fixedly connected to the frame with the rotation axis of the heat exchange coil. One end of the inlet pipe is connected to the annular tank, and the other end is connected to the wastewater discharge pipe of the non-heavy metal wastewater chamber, for introducing the treated discharged wastewater into the annular tank. The liquid inlet of the heat exchange coil is U-shaped and inserted downward into the annular tank.

2. The ternary precursor production wastewater recovery system according to claim 1, characterized in that, The annular tank includes an annular seat and an annular cover. The inlet pipe is fixed to the top of the annular seat, and the annular cover is rotatably connected to the top of the annular seat to cover and seal the opening of the annular seat. The liquid inlet of the heat exchange coil is connected to the annular cover.

3. The ternary precursor production wastewater recovery system according to claim 2, characterized in that, The medium export assembly includes a rotary joint, a pump body, and a suction pipe. The rotary joint is coaxially and fixedly connected to the frame with the rotating shaft of the heat exchange coil. The liquid outlet of the heat exchange coil passes through the annular hollow of the annular tank and is connected to the rotating end of the rotary joint. The other end of the rotary joint is connected to the pump body. The pump body is connected to the heat recovery device through the suction pipe.

4. The ternary precursor production wastewater recovery system according to claim 3, characterized in that, The heat exchange coils are multiple in number and arranged in a circle around the axis of rotation. The liquid outlets of the multiple heat exchange coils are connected to the rotating end of the rotary joint through straight pipes.

5. The ternary precursor production wastewater recovery system according to claim 4, characterized in that, The drive mechanism includes a drive motor, a ring gear, and a drive gear. The ring gear is mounted and fixed on the outside of the straight tube. The drive gear is connected to the output shaft of the drive motor and meshes with the ring gear.

6. The ternary precursor production wastewater recovery system according to claim 1, characterized in that, The evaporation device includes a heating device and an evaporation pipe. The heating device is installed on the high-temperature heavy metal wastewater chamber and is used to heat the wastewater. One end of the evaporation pipe is connected to the high-temperature heavy metal wastewater chamber and the other end is connected to the heat recovery device.

7. The ternary precursor production wastewater recovery system according to claim 1, characterized in that, The heat recovery device is equipped with a first discharge pipe and a second discharge pipe. The first discharge pipe is used to discharge steam condensate to the non-heavy metal wastewater chamber, and the second discharge pipe is used to discharge the medium liquid that has passed through the heat exchange device to the outside.

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