An electrodialysis concentration salt production device

An electrodialysis and electrode technology, which is applied in the field of water treatment, can solve the problems of a large amount of energy consumption and increase the cost of salt production, and achieve the effects of reducing energy consumption, prolonging service life, and no secondary pollution

Active Publication Date: 2011-12-07
HANGZHOU WATER TREATMENT TECH DEV CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with the desalination of medium and low concentration feed liquid, concentration has higher requirements on the mass transfer characteristic parameters of the membrane, and it is difficult for general heterogeneous ion exchange memb

Method used

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  • An electrodialysis concentration salt production device
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  • An electrodialysis concentration salt production device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] according to Figure 1-6 The principle structure shown is to install an electrodialysis concentrated salt production device, which includes an electrodialysis mechanism, a solid salt separation and collection mechanism, and a solid salt separation and collection mechanism including membrane stacks, electrodes, separators and flow channel partitions. The electrodes are platinum coatings with a thickness of 3 microns. Platinum-coated titanium electrodes, the separator is a composite elastic separator, made of PVC, the thickness of the separator is 0.8mm, each water distribution port 4 is connected with a water distribution channel plate 5, and each water distribution channel plate 5 is distributed with 12 water distribution channels, the width of the water distribution channel is 0.4mm, and the depth is 0.4mm; the solid salt separation and collection mechanism includes a supersaturated brine inlet 9, an unsaturated brine outlet 10, an inclined plate 11, and a solid salt di...

Embodiment 2

[0031] An electrodialysis concentrated salt production device, including an electrodialysis mechanism, a solid salt separation and collection mechanism, and a solid salt separation and collection mechanism including membrane stacks, electrodes, separators and flow channel partitions, wherein the electrode is a titanium-coated ruthenium electrode with a coating thickness of 5 microns, wherein The coating is made of TiO 2 , RuO 2 , IrO 2 The eutectic, wherein the mass ratio is 5:3:1. The thickness of the composite elastic partition is 0.7mm, and each channel opening is processed with 10 water distribution channels, the width of the water distribution channel is 0.5mm, and the depth is 0.5mm; the negative membrane adopts AMT homogeneous ion exchange membrane; the positive membrane adopts CMS2 1- Divalent separation homogeneous ion exchange membrane; its membrane resistance is 0.4Ω / cm 2 ;Crosslinking degree is 85%, film thickness is 0.10mm; electrodialysis current density is 70...

Embodiment 3

[0034] With the same device shown in Example 2, industrial waste water containing 3.0% sodium sulfate was used as the influent to enter the electrodialysis dilute chamber. Membrane stack electrodes are made of titanium-coated ruthenium electrodes with a coating thickness of 15 microns; the composite elastic separator is a PC board with a thickness of 0.8 mm, and each channel opening is processed with 10 water distribution channels with a width of 0.6 mm and a depth of 0.6 mm. mm; the negative membrane adopts AMV homogeneous ion exchange membrane; the positive membrane adopts CMF2 1-2 valence separation homogeneous ion exchange membrane; its membrane resistance is 0.6Ω / cm 2 ; The degree of cross-linking is 75%, the film thickness is 0.15mm; the current density of electrodialysis is 700A / m 2 , the membrane surface flow velocity is 15m / s, and the electrodialysis operating water temperature is 35°C. After concentrated operation by electrodialysis, the fresh water in the fresh wat...

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Abstract

The invention belongs to the technical field of water treatment and particularly relates to an electrodialysis concentration salt-making device. The device comprises a membrane stack, electrodes, baffle plates, an electrodialysis mechanism of a runner isolating net and a solid salt separation and collection mechanism, wherein platinum-coated titanium electrodes or ruthenium-coated titanium electrodes are used; an upper runner, a connecting runner and a lower runner are arranged on a water distribution runner plate; an inclined plate is arranged in the solid salt separation and collection mechanism; and a structural design of counterflow heat exchange is utilized to realize the aim of the invention. The invention has the following advantages: the evaporation process is avoided, the energy consumption of salt-making is greatly reduced, the problems such as secondary pollution are not solved, and the service life of the device is greatly prolonged; and the device can be used in the high-current density condition. The electrodialysis concentration salt-making device has wide application prospects in the water treatment industry.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to an electrodialysis device for concentrated salt production. technical background [0002] Electrodialysis to concentrate seawater to produce salt is a mature industrial technology. It has replaced the salt field method in Japan for more than 30 years and has been extended to many countries in Australia, South America and the Middle East. my country's coastal salt fields are gradually decreasing. Reverse osmosis seawater desalination technology is becoming more and more mature, and its installed capacity is expanding rapidly. Many schemes have been proposed for its concentrated water utilization. In order to protect the marine environment, develop a circular economy and ensure sea salt production, electrodialysis concentration salt production is favored. [0003] In 1960, Japan carried out research on electrodialysis technology with the goal of concentrating s...

Claims

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Application Information

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IPC IPC(8): C02F1/469C01D3/06
Inventor 金可勇
Owner HANGZHOU WATER TREATMENT TECH DEV CENT
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