Phosphoric acid recovery system for waste phosphoric acid in electronic industry
By combining ultrafiltration, nanofiltration, and plate membrane distillation technologies, the problem of separating and purifying harmful substances in waste phosphoric acid from the electronics industry has been solved, achieving efficient and low-cost phosphoric acid recovery, which is in line with the concept of sustainable development.
Patent Information
- Application Number
- CN202423159877.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2034-12-20
AI Technical Summary
Existing technologies are insufficient for efficiently separating and purifying harmful substances in waste phosphoric acid from the electronics industry, and traditional methods suffer from secondary pollution and high costs.
Preliminary impurity removal is achieved by using ultrafiltration and nanofiltration devices, combined with plate membrane distillation units to utilize waste heat from the plant for separation and concentration, thus realizing the efficient recovery of phosphoric acid.
It improves the separation efficiency and purification effect of phosphoric acid, reduces operating costs, reduces secondary pollution, and can effectively utilize wastewater and factory waste heat, thus having high-efficiency resource recycling value.
Smart Images
Figure CN223586926U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a kind of phosphoric acid recovery system of electronic industry waste phosphoric acid. BACKGROUND
[0002] With the acceleration of industrialization, the demand for phosphorus resources is increasing, and phosphorus resources are non-renewable resources with limited reserves. A large amount of waste phosphoric acid is generated in the production process of the electronic industry, and these waste phosphoric acid contains a large amount of harmful substances such as heavy metals. Waste phosphoric acid contains recyclable phosphorus elements, and recycling can reduce dependence on primary phosphorus resources and reduce production costs. Recycling waste phosphoric acid can generate economic benefits, and is also conducive to resource recycling, in line with the concept of sustainable development.
[0003] With the development of science and technology, the technology of waste phosphoric acid recycling is constantly improving, such as ion exchange, chemical precipitation, etc., which continuously improves the recovery rate of waste phosphoric acid. However, ion exchange cannot selectively remove metal ion mixtures, and the operating conditions will affect the exchange efficiency and stability of the resin; chemical precipitation will produce other pollutants. At present, inorganic phosphate has high production and low price on the market, and the competition pressure of products prepared by recycling is great, and the market value is not high, which is not good for the resource utilization of waste phosphoric acid, and the purified and recovered phosphoric acid products have higher market value. SUMMARY
[0004] The utility model aims at overcoming the defects of prior art and providing a kind of phosphoric acid recovery system of electronic industry waste phosphoric acid, it has higher separation efficiency, can better realize the purification and separation of phosphoric acid target component.
[0005] The utility model aims at overcoming the defects of prior art and providing a kind of phosphoric acid recovery system of electronic industry waste phosphoric acid, it has higher separation efficiency, can better realize the purification and separation of phosphoric acid target component.
[0006] The inlet of the phosphoric acid dilution tank is connected with the outlet of the waste phosphoric acid storage tank;
[0007] The inlet of the ultrafiltration device is connected with the outlet of the phosphoric acid dilution tank;
[0008] The feed liquid inlet of the nanofiltration device is connected with the outlet of the ultrafiltration device, and the retentate of the nanofiltration device flows back into the phosphoric acid dilution tank;
[0009] The inlet of the condensate tank is connected with the pure water outlet of the plate membrane distillation unit, and the outlet of the condensate tank is connected with the water supplement port of the phosphoric acid dilution tank.
[0010] The inlet of the condensate tank is connected with the pure water outlet of the plate membrane distillation unit, and the outlet of the condensate tank is connected with the water supplement port of the phosphoric acid dilution tank.
[0011] The phosphoric acid recovery system of electronic industry waste phosphoric acid, wherein the plate membrane distillation unit is heated by factory waste heat.
[0012] The phosphoric acid recovery system of electronic industry waste phosphoric acid has the following characteristics:
[0013] 1) The impurities in the waste phosphoric acid are separated and removed by the ultrafiltration device and the nanofiltration device, no new substances are introduced, no secondary pollution is caused, the quality and added value of the product can be improved, and no complex operation and equipment are required, and the separation effect is high.
[0014] 2) Compared with the traditional evaporation, the plate membrane distillation unit has a relatively low feed temperature, can utilize cheap and low-grade energy such as factory waste heat, and can reduce the operation cost; the plate membrane distillation unit is relatively simple to operate, easy to maintain, has a small floor area, and has high thermal efficiency and low energy consumption; in addition, the plate membrane distillation unit is designed in a module, is convenient to expand and upgrade, has higher separation efficiency, can better realize the purification and separation of the target component of the phosphoric acid, and improve the quality and added value of the phosphoric acid product.
[0015] 3) The waste water and factory waste heat can be effectively utilized, energy is saved, and the cost is reduced. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 The phosphoric acid recovery system of electronic industry waste phosphoric acid has the following characteristics: DETAILED DESCRIPTION
[0017] The phosphoric acid recovery system of electronic industry waste phosphoric acid will be further described below with reference to the drawings.
[0018] Please refer to Figure 1 The phosphoric acid recovery system of electronic industry waste phosphoric acid comprises a phosphoric acid dilution tank 2, an ultrafiltration device 3, a nanofiltration device 4, a plate membrane distillation unit 5, a condensate tank 6, and a pure phosphoric acid storage tank 8, wherein
[0019] The inlet of the phosphoric acid dilution tank 2 is connected with the outlet of the waste phosphoric acid storage tank 1.
[0020] The inlet of the ultrafiltration device 3 is connected with the outlet of the phosphoric acid dilution tank 2.
[0021] The feed liquid inlet of the nanofiltration device 4 is connected with the outlet of the ultrafiltration device 3, and the retentate of the nanofiltration device 4 flows back into the phosphoric acid dilution tank 2.
[0022] The inlet of the plate membrane distillation unit 5 is connected with the permeate outlet of the nanofiltration device 4, and the plate membrane distillation unit 5 is heated by factory waste heat 7.
[0023] The inlet of the condensate tank 6 is connected with the pure water outlet of the plate membrane distillation unit 5, and the outlet of the condensate tank 6 is connected with the water supplementing port of the phosphoric acid dilution tank 2.
[0024] The inlet of the pure phosphoric acid storage tank 8 is connected with the outlet of the plate membrane distillation unit 5.
[0025] The working process of the phosphoric acid recovery system for electronic industry waste phosphoric acid is as follows:
[0026] S1, the waste phosphoric acid is first diluted to a concentration of 10-15% in the phosphoric acid dilution tank 2, and then filtered through the ultrafiltration device 3 and the nanofiltration device 4 in turn; the ultrafiltration device 3 retains colloids, macromolecules and other particles in the waste phosphoric acid liquid; the nanofiltration device 4 removes multivalent inorganic ions in the waste phosphoric acid liquid, the temperature of the nanofiltration device 4 is not more than 35-40℃, and the operating pressure is 3-4Mpa; the retentate of the nanofiltration device 4 is returned to the phosphoric acid dilution tank 2 for recycling and purification;
[0027] S2, the plate membrane distillation unit 5 collects the solution filtered by the nanofiltration device 4, and separates and concentrates; the plate membrane distillation unit 5 is heated to 80-85℃ by using the waste heat of the factory, the vacuum pressure is-85 to-90Kpa, and the running time is 55min to 1h; the separation process of the plate membrane distillation unit 5 is that the volatile substances in the solution at a higher temperature side pass through the hydrophobic microporous membrane into the other side in a gaseous state and condense, and the non-volatile ions and molecules and other solutes cannot pass through the hydrophobic membrane, so as to realize the purpose of separation and purification of phosphoric acid; the distilled water separated by the plate membrane distillation unit 5 is condensed to a temperature of 35-40℃ in the condensed water tank 6, and then returned to the phosphoric acid dilution tank 2 as make-up water of the phosphoric acid dilution tank 2; the high-concentration phosphoric acid obtained from the plate membrane distillation unit 5 is returned to the high-concentration phosphoric acid storage tank 8.
[0028] The phosphoric acid recovery system for electronic industry waste phosphoric acid adopts the ultrafiltration device 3 and the nanofiltration device 4 to realize the preliminary impurity removal of waste acid, and can effectively remove particulate matters and metal ions in the waste phosphoric acid; the plate membrane distillation unit 5 made of PTFE material resistant to acid and alkali is used to concentrate and purify the waste phosphoric acid, the volatile components in the liquid pass through the membrane holes in the form of steam to achieve the purpose of separation, and realize the recycling and utilization of resources. The system has the advantages of simple operation, easy maintenance, flexible operation, low energy consumption and high efficiency, and can efficiently separate and concentrate and recover phosphoric acid by introducing the plate membrane distillation technology.
[0029] The above examples are only used to illustrate the utility model, and are not limited to the utility model. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the utility model, therefore, all equivalent technical solutions should belong to the scope of the utility model, and should be limited by the claims.
Claims
1. A phosphoric acid recovery system for waste phosphoric acid from the electronics industry, comprising a phosphoric acid dilution tank, an ultrafiltration unit, a nanofiltration unit, a plate membrane distillation unit, and a condensate tank; characterized in that, The inlet of the phosphoric acid dilution tank is connected to the outlet of the waste phosphoric acid storage tank; The inlet of the ultrafiltration device is connected to the outlet of the phosphoric acid dilution tank; The feed inlet of the nanofiltration unit is connected to the outlet of the ultrafiltration unit, and the retentate of the nanofiltration unit is returned to the phosphoric acid dilution tank. The inlet of the plate membrane distillation unit is connected to the permeate outlet of the nanofiltration device; The inlet of the condensate tank is connected to the pure water outlet of the plate membrane distillation unit, and the outlet of the condensate tank is connected to the water supply port of the phosphoric acid dilution tank.
2. The phosphoric acid recovery system for waste phosphoric acid in the electronics industry according to claim 1, characterized in that, The plate membrane distillation unit is heated by waste heat from the factory.