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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  • 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 ha

Method used

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Examples

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Example Embodiment

[0045] Example 1

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

[0047] The inlet water of the protection solution is 1mol / L NaCl, and the inlet volume is 3L; the main composition of the desalination stock solution is shown in Table 1, and the 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 entering volume of the mixed solution 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 210A·m -2 , And control the apparent linear velocity of the protection liquid in the anode p...

Example Embodiment

[0054] Example 2

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

[0056] The inlet water of the protection solution is 1mol / L NaCl, and the inlet volume is 3L; the main composition of the desalination stock solution is shown in Table 2, and the 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 entering volume of the mixed solution is 2L; the main composition of the protection solution is shown in Table 2.

[0057] During the electrodialysis process, the average current density is controlled to 210A·m -2 , And control the apparent linear velocity of the protection solution in the ano...

Example Embodiment

[0062] Example 3

[0063] In Example 3, the first positive film K1 and the second positive film K2 are both Cl resistant 2 The corrosion-enhanced cation membrane, the first anion membrane A1, the second anion 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 liquid inlet water is 0.25mol / LNa 2 SO 4 , The inlet volume is 3L; the main composition of the desalination stock solution is shown in Table 3, and the inlet volume is 4.5L; the inlet volume of the concentrated solution is 0.95L; the electrode solution is 0.5mol / LNa 2 SO 4 And 0.005mol / L H 2 SO 4 The entering volume of the mixed solution is 2L; the main composition of the protection solution is shown in Table 3.

[0065] During the electrodialysis process, the average current density is controlled to 210A·m -2 , And control the apparent linear velocity of the protection solution in the anode protection chamber and the cathod...

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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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