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Electrodialysis device

A technology of electrodialysis and positive membrane, applied in electrodialysis, water/sludge/sewage treatment, water pollutants, etc., can solve the problems of no use value, increase of separation cost, high separation cost, etc., to ensure long-term stable operation , mitigation of discharge or reuse issues, effects from a wide range of sources

Inactive Publication Date: 2017-06-13
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, the method of supplementing a large amount of new electrode solution is generally adopted to keep the magnesium ion content in the catholyte at a low level, but this method will cause more fresh water and NaNO 3 / nitric acid or NaSO 4 The large consumption of reagents such as / sulfuric acid increases the cost of separation
[0006] In addition, some studies have reported the method of reducing the pH value of the electrode solution or directly using acid solution as the electrode solution, but these methods will cause a large amount of acid consumption on the one hand, and the separation cost is higher; on the other hand, catholyte with high acidity It will also have a strong corrosion effect on the cathode plate and has no use value

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] In Example 1, both the first positive film K1 and the second positive film K2 are resistant to Cl 2 The corrosion-enhanced positive membrane, the first negative membrane A1 and the second negative membrane A2 are all A192 type membranes, the anion exchange membrane A is all ACS type membranes, and the cation exchange membrane K is all CIMS type membranes.

[0047] The inlet water of the protective solution is 1mol / LNaCl, and its inlet volume is 3L; the main composition of the desalination stock solution is shown in Table 1, and its inlet volume is 4.5L; the inlet volume of the concentrated solution is 0.95L; the electrode solution is 1mol / L NaNO 3 with 0.01mol / LHNO 3 The mixed solution, whose entry volume is 2L; the main composition of the protection solution is shown in Table 1.

[0048] During the electrodialysis process, the average current density is controlled to be 210A m -2 , and control the superficial linear velocity of the protective solution in the anode p...

Embodiment 2

[0055] In embodiment 2, the first positive membrane K1 is a CIMS type membrane with an additional protective layer N801 on its outside, the second positive membrane K2 and the cation exchange membrane K are all CIMS type membranes, the first negative membrane A1 and the second negative membrane A2 All are AMX type membranes, and the anion exchange membrane A is all ACS type membranes.

[0056] The inlet volume of the protection solution is 1mol / LNaCl, and its inlet volume is 3L; the main composition of the desalination stock solution is shown in Table 2, and its inlet volume is 4.5L; the inlet volume of the concentrated solution is 0.95L; the electrode solution is 1mol / L NaNO 3 with 0.01mol / LHNO 3 The mixed solution, whose entry volume is 2L; the main composition of the protective solution is shown in Table 2.

[0057] During the electrodialysis process, the average current density is controlled to be 210A m -2 , and control the superficial linear velocity of the protective...

Embodiment 3

[0063] In Example 3, both the first positive film K1 and the second positive film K2 are resistant to Cl 2 The corrosion-enhanced positive membrane, the first negative membrane A1, the second negative membrane A2 and the anion exchange membrane A are all ACS type membranes, and the cation exchange membrane K is all CIMS type membranes.

[0064] Protection solution inlet water is 0.25mol / LNa 2 SO 4 , its entry volume is 3L; the main composition of the desalination stock solution is shown in Table 3, its entry volume is 4.5L; the entry volume of the concentrated solution feedwater is 0.95L; the electrode solution is 0.5mol / L 2 SO 4 and 0.005mol / L H 2 SO 4 The mixed solution, whose entry volume is 2L; the main composition of the protective solution is shown in Table 3.

[0065] During the electrodialysis process, the average current density is controlled to be 210A m -2 , and control the superficial linear velocity of the protective solution in the anode protection chamber an...

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Abstract

The invention provides an electrodialysis device. According to the electrodialysis device, by respectively arranging an anode protection chamber and a cathode protection chamber at ends of a membrane stack, respectively close to an anode chamber and a cathode chamber, and by operating a protective solution with an independent circulatory system, an electrode solution of the electrodialysis device is protected. The anode protection chamber and the anode chamber are isolated through an anode membrane, and the cathode protection chamber and the cathode chamber are isolated through another piece of anode membrane. The anode protection chamber and the cathode protection chamber are both isolated from a desalination chamber and a concentration chamber between the anode protection chamber and the cathode protection chamber through cathode membranes. Thus, high valence cation is controlled in transferring to the cathode chamber and the anode chamber through the membranes, and high valence cation in desalination liquor and concentrated liquor are effectively isolated. Content of high valence metal ions in the electrode solution is remarkably reduced, generation of precipitates in the cathode chamber or deposition on a negative plate due to a reduction reaction is avoided, cycle period of the electrode solution is greatly prolonged, and operating cost of the electrode solution is remarkably lowered.

Description

technical field [0001] The invention belongs to the technical field of electrically driven membrane separation, and in particular relates to an electrodialysis device. Background technique [0002] Electrodialysis, as an electrically driven membrane separation technology, is widely used in seawater desalination, brackish water desalination, food and pharmaceutical production and other fields. In recent years, with the development of special ion exchange membranes and the continuous innovation and improvement of traditional electrodialysis devices, the application of electrodialysis in the fields of resource utilization of industrial wastewater and separation and extraction of rare and precious metals has grown rapidly. Electrodialysis can be used to recover precious metals from industrial waste liquids containing metal ions such as nickel, cobalt, manganese, copper, chromium, and zinc; electrodialysis devices equipped with monovalent ion-selective exchange membranes can be u...

Claims

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Application Information

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IPC IPC(8): B01D61/44B01D61/48C02F1/469C02F101/10
CPCB01D61/445B01D61/485C02F1/4693C02F2101/10Y02A20/124
Inventor 温现明朱朝梁
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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