Target product production and heavy metal recovery integrated system

Abstract

The utility model relates to the technical field of chemical engineering, and discloses a target product production and heavy metal recovery integrated system which comprises a reaction device and an electrolysis device. The reaction device produces a target product and a first waste liquid containing heavy metals; the electrolysis device comprises a cathode chamber and an anode chamber, the cathode chamber and the anode chamber are separated through an ion exchange membrane, the cathode chamber contains a mineralizing agent, and the anode chamber contains an acid solution; a liquid inlet of the cathode chamber is communicated with the reaction device through a first pipeline, the first pipeline is used for circulating first waste liquid, and the first waste liquid is subjected to electrolytic reaction in the electrolysis device to obtain a heavy metal solid product in the cathode chamber. The device can realize integrated treatment of production of a target product and recovery of heavy metals, can optimize the cost of recovering the heavy metals, does not generate secondary pollution, and avoids waste of heavy metal resources. Meanwhile, the heavy metal recycling device does not need to stop working and production when recycling heavy metal, and high-benefit continuous production is achieved.

Description

Technical Field

[0001] This utility model relates to the field of chemical technology, specifically to an integrated system for the production of target products and the recovery of heavy metals. Background Technology

[0002] In current chemical production, while producing the target product, there is also waste liquid containing heavy metals. This waste liquid contains heavy metals, which poses a serious threat to human health and has high subsequent treatment costs.

[0003] Taking the production of lead iodide, a perovskite precursor, as an example, the current production process of the target product, lead iodide, includes lead iodide synthesis. During the process of cleaning lead iodide, a large amount of waste liquid containing heavy metals is generated. At present, the treatment of waste liquid containing heavy metals in industrial production mainly relies on chemical precipitation. This method consumes a large amount of chemicals, is prone to secondary pollution, and has a complex process and high recycling costs. Utility Model Content

[0004] In view of this, the present invention provides an integrated system for target product production and heavy metal recovery to solve the problems of secondary pollution and high treatment costs in the treatment of heavy metal-containing waste liquid during target product production.

[0005] In a first aspect, this utility model provides an integrated system for the production of a target product and the recovery of heavy metals, including a reaction device and an electrolysis device. The reaction device produces the target product and a first waste liquid containing heavy metals; the electrolysis device includes a cathode chamber and an anode chamber, which are separated by an ion exchange membrane. The cathode chamber contains a mineralizing agent, and the anode chamber contains an acidic solution; the inlet of the cathode chamber is connected to the reaction device through a first pipeline, which is used to flow the first waste liquid. After electrolysis in the electrolysis device, the first waste liquid yields a solid heavy metal product in the cathode chamber.

[0006] Beneficial Effects: The integrated system for target product production and heavy metal recovery provided by this utility model optimizes the cost of heavy metal recovery compared to chemical recovery methods, and avoids secondary pollution and waste of heavy metal resources. Furthermore, this utility model enables integrated processing of target product production and heavy metal recovery, allowing for efficient continuous production without shutdowns during heavy metal recovery. In addition, the integrated processing of target product production and heavy metal recovery reduces reliance on manual labor, saving human resources.

[0007] In one alternative embodiment, a filtration device is also included, which is disposed in the first pipeline and is used to separate the target product and the first waste liquid.

[0008] In one alternative embodiment, the system further includes a first liquid pump and a flow meter, both of which are located in a first pipeline between the filter device and the cathode chamber.

[0009] In one optional embodiment, the cathode chamber produces a second waste liquid; it also includes a water recovery module, which is connected to the outlet of the cathode chamber via a second pipeline, and is used to purify the second waste liquid to obtain recovered water.

[0010] In one optional embodiment, the recycled water module includes a second liquid pump, a settling tank, and a water storage tank arranged sequentially along the second pipeline along the processing flow direction. The settling tank is used to settle the second waste liquid to obtain recycled water, and the water storage tank is used to store the recycled water. The water storage tank is connected to the inlet of the reaction device through a first water supply pipeline, and / or the water storage tank is connected to the inlet of the anode chamber through a second water supply pipeline.

[0011] In one alternative embodiment, a heat exchanger is also included, which is connected to a second pipeline between the cathode chamber and the settling tank for heat exchange.

[0012] In one alternative implementation, the first water supply line is connected to a heat exchanger for heat exchange.

[0013] In one optional embodiment, the anode chamber produces waste gas and / or waste acid; it also includes an acid recovery module connected to the outlet of the anode chamber via a third pipeline, the acid recovery module being used to recover and treat the waste gas and / or waste acid.

[0014] In one optional embodiment, the acid recovery module includes a gas-liquid separation device, a concentration device, a recovered acid storage device, and a liquid oxygen tank. The gas-liquid separation device is used to separate waste gas and waste acid to obtain waste gas, waste acid, and liquid oxygen. The gas-liquid separation device includes a liquid inlet, a waste acid outlet, a waste gas outlet, and a liquid oxygen outlet. The liquid inlet of the gas-liquid separation device, the waste acid outlet of the gas-liquid separation device, the concentration device, and the recovered acid storage device are sequentially arranged in the third pipeline along the processing flow direction. The liquid oxygen outlet of the gas-liquid separation device is connected to the liquid oxygen tank through a branch.

[0015] In one alternative embodiment, the electrolysis unit, the gas-liquid separation unit, and the concentration unit are integrated into a skid-mounted unit; and / or, the anode chamber is equipped with a pH meter; and / or, the water storage tank is equipped with a conductivity meter. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of an integrated system for target product production and heavy metal recycling according to an embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures:

[0019] 1. Reaction apparatus; 11. First water supply pipeline; 2. Electrolysis apparatus; 21. Cathode chamber; 22. Anode chamber; 23. Ion exchange membrane; 24. pH meter; 3. Filtration apparatus; 4. First liquid pump; 5. Flow meter; 61. Second liquid pump; 62. Sedimentation tank; 63. Water storage tank; 631. Conductivity meter; 7. Heat exchanger; 81. Gas-liquid separation device; 82. Concentration device; 83. Acid recovery storage device; 84. Liquid oxygen tank; 9. Acid tank. Detailed Implementation

[0020] 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 only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] The following is combined with Figure 1 The following describes embodiments of the present invention.

[0022] According to an embodiment of this utility model, an integrated system for target product production and heavy metal recovery is provided, including a reaction device 1 and an electrolysis device 2. The reaction device 1 produces the target product and a first waste liquid containing heavy metals; the electrolysis device 2 includes a cathode chamber 21 and an anode chamber 22, which are separated by an ion exchange membrane 23. The cathode chamber 21 contains a mineralizing agent, and the anode chamber 22 contains an acidic solution; the inlet of the cathode chamber 21 is connected to the reaction device 1 through a first pipeline for flowing the first waste liquid. After electrolysis in the electrolysis device 2, the first waste liquid yields a solid heavy metal product in the cathode chamber 21.

[0023] The integrated system for target product production and heavy metal recovery provided in this embodiment of the invention, by setting up a reaction device 1 and an electrolysis device 2, can realize the production of target product and the recovery of heavy metals. Specifically, the reaction device 1 can produce the target product and a first waste liquid. The first waste liquid enters the cathode chamber 21 of the electrolysis device 2 through a first pipeline. After undergoing electrolysis reaction in the electrolysis device 2, a solid metal product is obtained.

[0024] This invention provides an integrated system for the production of the target product and the recovery of heavy metals. Compared to chemical recovery methods, this system optimizes the cost of heavy metal recovery, avoids secondary pollution, and prevents the waste of heavy metal resources. Furthermore, this invention enables integrated processing of target product production and heavy metal recovery, allowing for efficient continuous production without shutdowns. This system is particularly suitable for treating wastewater generated during lead iodide preparation. In addition, the integrated processing of target product production and heavy metal recovery reduces reliance on manual labor, saving human resources.

[0025] Specifically, in some embodiments, the reaction apparatus 1 can be a reaction vessel equipped with a stirring device. During the reaction process, the reaction apparatus 1 can be stirred by the stirring device to ensure sufficient reaction between the materials.

[0026] The cathode electrode in the cathode chamber can be a single electrode or multiple electrodes connected in series or parallel, and the anode electrode in the anode chamber can be the same.

[0027] The shape of the electrolysis device 2 is not limited; for example, it can be made into a cylindrical or square tank shape.

[0028] Similarly, the shape of the cathode and anode is not limited; for example, they can be cuboids or cylinders.

[0029] In some embodiments, an acid tank 9 is also included, and the acid tank 9 is connected to the anode chamber 22 via a pipeline, and the acid tank 9 can provide the anode chamber 22 with the acidic solution required for the electrolysis reaction.

[0030] Furthermore, the anode chamber 22 is equipped with a pH meter 24, which requires the pH of the acidic solution to be in the range of 2 to 4. When the pH of the acidic solution exceeds the pH range, the pH value is dynamically controlled by the water storage tank 63 and the acid tank 9.

[0031] Taking the production of perovskite precursor lead iodide and the recovery of metallic lead as an example, water, potassium iodide, and lead acetate solution are added to reaction device 1 to produce lead iodide and a first waste liquid. The lead acetate solution can be added dropwise using a matching funnel. During the dropwise addition of the lead acetate solution, the rate and volume of the lead acetate solution are controlled. The negative electrode of cathode chamber 21 can be a stainless steel electrode, and the positive electrode of anode chamber 22 can be a titanium-coated ruthenium electrode. A mineralizing agent is added to cathode chamber 21, and stirring promotes the enrichment of lead in the wastewater. An acidic solution is added to anode chamber 22. Cathode chamber 21 and anode chamber 22 are separated by an ion exchange membrane 23, and current is passed through to electrolyze and recover lead.

[0032] The water can be recycled water or newly added deionized water.

[0033] The mineralizing agent can be one or more silicates such as calcium aluminum, magnesium aluminum hydrotalcite, etc.

[0034] The acidic solution can be sulfuric acid or hydrochloric acid with a concentration of 0.8 mol / L to 1 mol / L.

[0035] After electrolysis, a solid product is generated on the cathode surface. After washing with dilute sulfuric acid and deionized water, crude lead is obtained after vacuum drying.

[0036] In some embodiments, a filter device 3 is also included, which is disposed in the first pipeline and is used to separate the target product and the first waste liquid.

[0037] The target product and the first waste liquid generated by the reaction in the reaction device 1 enter the filtration device 3, which can separate the target product and the first waste liquid.

[0038] Specifically, in some embodiments, the filter device 3 is a pressure plate and frame filter.

[0039] Furthermore, the pressure plate and frame filter has a detachable structure, which allows for easy replacement of the filter cloth after disassembly, ensuring the complete separation of the target product and the first waste liquid.

[0040] Of course, in some embodiments, the pressure plate and frame filter may be replaced by a laboratory-like vacuum filtration device that does not have a sealed configuration.

[0041] Taking the production of perovskite precursor lead iodide and the recovery of metallic lead as an example, the reaction device 1 produces lead iodide and lead-containing first waste liquid. The lead iodide is retained under pressure in a pressure plate and frame filter, while the first waste liquid enters the cathode chamber 21 of the electrolysis device 2 through the second pipeline for the next reaction.

[0042] In some embodiments, the system further includes a first liquid pump 4 and a flow meter 5, both of which are located in a first pipeline between the filter device 3 and the cathode chamber 21.

[0043] The first pump 4 provides the power for the first waste liquid to enter the cathode chamber 21 through the first pipeline.

[0044] Flow meter 5 can monitor the flow rate of the first waste liquid in the first pipeline.

[0045] Specifically, a drain valve is installed in the pipeline connecting the product outlet at the bottom of the reaction device 1 to the filter device 3. After the reaction is completed, the drain valve and the first pump 4 are opened to discharge the target product and the first waste liquid into the filter device 3 for filtration and separation. The first pump 4 then pumps the first waste liquid separated by the filter device 3 into the cathode chamber 21 for the next electrolysis reaction. During this process, the flow rate of the first waste liquid in the first pipeline can be confirmed by the flow meter 5.

[0046] In some embodiments, the cathode chamber 21 produces a second waste liquid; it also includes a water recovery module, which is connected to the outlet of the cathode chamber 21 via a second pipeline, and is used to purify the second waste liquid to obtain recovered water.

[0047] By setting up a water recovery module, the second waste liquid produced by the cathode chamber 21 can be purified to obtain water, which can be supplied to the reaction device 1, thereby improving resource utilization.

[0048] In some embodiments, the water recovery module includes a second liquid pump 61, a sedimentation tank 62, and a water storage tank 63 arranged sequentially along the second pipeline along the processing flow direction. The sedimentation tank 62 is used to settle the second waste liquid to obtain recovered water, and the water storage tank 63 is used to store the recovered water. The water storage tank 63 is connected to the inlet of the reaction device 1 through the first water supply pipeline 11, and / or, the water storage tank 63 is connected to the inlet of the anode chamber 22 through the second water supply pipeline.

[0049] Furthermore, it should be noted that if the water storage tank 63 and the reaction device 1 are connected through the first water supply pipeline 11, the first water supply pipeline 11 usually needs to be equipped with a purification device to improve the purity of the recycled water.

[0050] By setting a second pump 61, the second waste liquid produced after the reaction in the cathode chamber 21 can be pumped into the settling tank 62 through a second pipeline.

[0051] By setting up a settling tank 62, the second waste liquid can first enter the settling tank 62 for settling. The impurities in the second waste liquid settle in the settling tank 62 and are treated separately. The recycled water obtained after settling is stored in the water storage tank 63 through the second pipeline.

[0052] Specifically, the settling tank 62 can be an inclined settling tank. Compared with the traditional vertical settling tank, it can improve the settling efficiency by increasing the settling area and shortening the settling distance. At the same time, it has significant advantages in reducing the footprint, improving the uniformity of water flow, and simplifying maintenance.

[0053] The second waste liquid is pumped into the settling tank 62 by the second pump 61. The settling tank 62 contains flocculants or settling aids, which helps to improve the settling efficiency.

[0054] By setting up a water storage tank 63, and in the second pipeline, along the processing direction, the water storage tank 63 is located downstream of the sedimentation tank 62. Therefore, after sedimentation in the sedimentation tank 62, impurities settle in the tank and are treated separately. The recycled water obtained after sedimentation treatment is stored in the water storage tank 63 through the second pipeline.

[0055] Furthermore, the water storage tank 63 is equipped with a conductivity meter 631 for detecting the quality of the purified water, and the recycled water in the water storage tank 63 can be used to supply water to the reaction device 1, and / or to supply water to the anode chamber 22.

[0056] In some embodiments, a heat exchanger 7 is also included, which is connected to a second pipeline between the cathode chamber 21 and the settling tank 62 for heat exchange.

[0057] By setting up a heat exchanger 7, which can be connected to the second pipeline for heat exchange, the second waste liquid produced from the cathode chamber 21 enters the second pipeline and can exchange heat with the heat exchanger 7, thereby recovering the waste heat of the second waste liquid coming out of the cathode chamber 21.

[0058] In some embodiments, the first water supply line 11 is connected to the heat exchanger 7 for heat exchange.

[0059] The water required in the reaction device 1 can be added through the first water supply pipe 11. Since the first water supply pipe 11 is connected to the heat exchanger 7 for heat exchange, the water in the first water supply pipe 11 can be heated by the heat exchanger 7 before entering the reaction device 1 for reaction, which is beneficial for the materials in the reaction device 1 to react fully.

[0060] Since the heat exchanger 7 is connected to the second pipeline for heat exchange, and the heat exchanger 7 is also connected to the first water supply pipeline 11 for heat exchange, the waste heat of the second waste liquid can be recovered and used to heat the water entering the reaction device 1 by using the heat exchanger 7, so as to increase the reaction temperature of the materials in the reaction device and achieve the effect of full reaction.

[0061] The system provided in this embodiment generates heat to heat materials inside the system, thereby improving the system's energy utilization rate.

[0062] In some embodiments, the anode chamber 22 may produce waste gas and / or waste acid; it also includes an acid recovery module, which is connected to the outlet of the anode chamber 22 via a third pipeline, and is used to recover the waste gas and / or waste acid.

[0063] By setting up an acid recovery module, the waste gas and / or waste acid produced in the anode chamber 22 can be recovered and treated, thereby improving the resource recovery rate.

[0064] In some embodiments, the acid recovery module includes a gas-liquid separation device 81, a concentration device 82, a recovered acid storage device 83, and a liquid oxygen tank 84. The gas-liquid separation device 81 is used to separate waste gas and waste acid to obtain waste gas, waste acid, and liquid oxygen. The gas-liquid separation device 81 includes a liquid inlet, a waste acid outlet, a waste gas outlet, and a liquid oxygen outlet. The liquid inlet of the gas-liquid separation device 81, the waste acid outlet of the gas-liquid separation device 81, the concentration device 82, and the recovered acid storage device 83 are sequentially arranged in the third pipeline along the processing flow direction. The liquid oxygen outlet of the gas-liquid separation device 81 is connected to the liquid oxygen tank 84 through a branch.

[0065] By installing a gas-liquid separation device 81 in the third pipeline, the waste gas and waste acid generated in the anode chamber 22 are first separated by the gas-liquid separation device 81 to obtain waste acid, which is then increased in concentration by the concentration device 82 and stored in the recovery acid storage device 83 for production reuse.

[0066] Meanwhile, the waste gas and waste acid generated in the anode chamber 22 are first separated by the gas-liquid separation device 81. If liquid oxygen is obtained, it is stored in the liquid oxygen tank 84.

[0067] Furthermore, the gas-liquid separation device 81 is a vacuum gas-liquid separation device. The concentration device 82 is a vacuum concentration device.

[0068] In some embodiments, the electrolysis device 2, the gas-liquid separation device 81, and the concentration device 82 are integrated as a skid-mounted unit.

[0069] The electrolysis unit 2, gas-liquid separation unit 81, and concentration unit 82 are integrated into a single skid-mounted unit as mobile equipment, improving space utilization and increasing integration, thus reducing on-site installation and commissioning time and costs. Furthermore, it can be quickly moved and reconfigured as needed, offering high flexibility.

[0070] The integrated system for target product production and heavy metal recovery provided in this embodiment of the invention can realize the integrated operation of target product synthesis, heavy metal recovery, separation and purification, and waste liquid and liquid oxygen recovery and synthesis.

[0071] The first waste liquid generated during cleaning is purified in the recovery water module via electrolysis unit 2. The water quality can be monitored in real time by conductivity meter 631 for recycling. In addition, heat exchanger 7 can recover the residual heat of the second waste liquid flowing out of cathode chamber 21 and heat the water entering reaction unit 1 to provide the temperature required for the reaction. The waste gas and waste acid generated at the anode can be recycled after treatment by two sets of related equipment. The integrated system achieves green production, reduces secondary pollution, optimizes costs through wastewater reuse, and simultaneously achieves process continuity and improves production efficiency.

[0072] The integrated system for target product production and heavy metal recycling provided in this embodiment of the invention can replace all process equipment with PLC control through simple equipment modification, thereby reducing manual intervention and saving human resources.

[0073] The integrated system for target product production and heavy metal recovery provided in this embodiment of the utility model can integrate the electrolysis device 2, the gas-liquid separation device 81 and the concentration device 82 into an integrated mobile device, thereby improving the space utilization of the system.

[0074] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. An integrated system for target product production and heavy metal recovery, characterized in that, include: The reaction apparatus (1) produces the target product and a first waste liquid containing heavy metals; An electrolysis device (2) is provided, comprising a cathode chamber (21) and an anode chamber (22), which are separated by an ion exchange membrane (23). The cathode chamber (21) contains a mineralizing agent, and the anode chamber (22) contains an acidic solution. The inlet of the cathode chamber (21) is connected to the reaction device (1) via a first pipeline. The first pipeline is used to flow a first waste liquid. After electrolysis in the electrolysis device (2), the first waste liquid yields a heavy metal solid product in the cathode chamber (21).

2. The integrated system for target product production and heavy metal recovery according to claim 1, characterized in that, It also includes a filter device (3), which is located in the first pipeline and is used to separate the target product and the first waste liquid.

3. The integrated system for target product production and heavy metal recovery according to claim 2, characterized in that, It also includes a first liquid pump (4) and a flow meter (5), both of which are located in the first pipeline between the filter device (3) and the cathode chamber (21).

4. The integrated system for target product production and heavy metal recovery according to any one of claims 1 to 3, characterized in that, The cathode chamber (21) produces a second waste liquid; it also includes a water recovery module, which is connected to the outlet of the cathode chamber (21) through a second pipeline. The water recovery module is used to purify the second waste liquid to obtain water recovery.

5. The integrated system for target product production and heavy metal recovery according to claim 4, characterized in that, The recycled water module includes a second liquid pump (61), a sedimentation tank (62) and a water storage tank (63) arranged sequentially along the second pipeline along the treatment flow direction. The sedimentation tank (62) is used to settle the second waste liquid to obtain recycled water, and the water storage tank (63) is used to store the recycled water. The water storage tank (63) is connected to the inlet of the reaction device (1) through the first water supply pipeline (11), and / or the water storage tank (63) is connected to the inlet of the anode chamber (22) through the second water supply pipeline.

6. The integrated system for target product production and heavy metal recovery according to claim 5, characterized in that, It also includes a heat exchanger (7) that is connected to the second pipeline between the cathode chamber (21) and the settling tank (62) for heat exchange.

7. The integrated system for target product production and heavy metal recovery according to claim 6, characterized in that, The first water supply pipeline (11) is connected to the heat exchanger (7) for heat exchange.

8. The integrated system for target product production and heavy metal recovery according to claim 5, characterized in that, The anode chamber (22) produces waste gas and / or waste acid; it also includes an acid recovery module, which is connected to the outlet of the anode chamber (22) via a third pipeline, and is used to recover the waste gas and / or waste acid.

9. The integrated system for target product production and heavy metal recovery according to claim 8, characterized in that, The acid recovery module includes a gas-liquid separator (81), a concentration device (82), an acid recovery storage device (83), and a liquid oxygen tank (84). The gas-liquid separator (81) is used to separate waste gas and waste acid to obtain waste gas, waste acid, and liquid oxygen. The gas-liquid separator (81) includes a liquid inlet, a waste acid outlet, a waste gas outlet, and a liquid oxygen outlet. The liquid inlet of the gas-liquid separator (81), the waste acid outlet of the gas-liquid separator (81), the concentration device (82), and the acid recovery storage device (83) are sequentially arranged in the third pipeline along the processing flow direction. The liquid oxygen outlet of the gas-liquid separator (81) is connected to the liquid oxygen tank (84) through a branch.

10. The integrated system for target product production and heavy metal recovery according to claim 9, characterized in that, The electrolysis device (2), the gas-liquid separation device (81), and the concentration device (82) are integrated into a skid-mounted unit; And / or, the anode chamber (22) is equipped with a pH meter (24); And / or, the water storage tank (63) is equipped with a conductivity meter (631).

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