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Device and method for recovering acid from waste liquid containing low-concentration acid and high-concentration metal ions through hydrogen-ion selective electrodialysis

A metal ion, concentration acid technology, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., to achieve simple operation, good application value, and the effect of solving the problem of hydrogen evolution

Inactive Publication Date: 2018-03-02
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of this, the technical problem to be solved by the present invention is to provide a device and method for hydrogen ion selective electrodialysis to reclaim acid from waste liquid containing low-concentration acid and high-concentration metal ions. The device provided by the present invention solves the current problems Difficulty of not being able to separate acid and metal ions from waste liquids containing low concentrations of acid and high concentrations of metal ions

Method used

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  • Device and method for recovering acid from waste liquid containing low-concentration acid and high-concentration metal ions through hydrogen-ion selective electrodialysis
  • Device and method for recovering acid from waste liquid containing low-concentration acid and high-concentration metal ions through hydrogen-ion selective electrodialysis

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Experimental program
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Effect test

Embodiment 1

[0126] When the acid in the waste liquid containing low-concentration acid and high-concentration metal ions is hydrochloric acid, the hydrogen ion selective electrodialysis provided in this embodiment recovers acid from the waste liquid containing low-concentration acid and high-concentration metal ions. The device includes cathode, anode, membrane stack, waste liquid sampling device, deionized water sampling device, sodium chloride sampling device, strong electrolyte solution sampling device, and power supply;

[0127] Wherein, the cathode is connected to the negative pole of the power supply; the anode is connected to the positive pole of the power supply; the cathode and the anode are respectively arranged on both sides of the membrane stack; the material of the anode and the cathode is titanium Ruthenium coated.

[0128] The membrane stack includes a cation exchange membrane, an anion exchange membrane, a repeating unit membrane formed by a hydrogen ion selective membrane...

Embodiment 2

[0139] The hydrogen ion selective electrodialysis device used in this embodiment is the same as that in Embodiment 1.

[0140] The anode chamber and the cathode chamber are connected in series, and 500mL 0.3mol / L Na 2 SO 4 The aqueous solution is used as a strong electrolyte, and 500mL of 0.5mol / L NaCl aqueous solution is passed into the auxiliary chamber, and 500mL of waste liquid containing low-concentration acid and high-concentration metal ions is passed into the desalination chamber, and the components are 0.3mol / L HCl and 0.5mol / L FeCl 2 , 500mL of water was passed into the concentration chamber. During the experiment, the linear flow velocity of each compartment solution flowing in the membrane stack was 5 cm / s, and the current density was kept constant at 5 mA / cm 2 .

[0141] The hydrogen ion selective electrodialysis device was operated for 55 minutes, and the experiment was stopped. The acid concentration in the wastewater in the desalination chamber could be red...

Embodiment 3

[0143] The hydrogen ion selective electrodialysis device used in this embodiment is the same as that in Embodiment 1.

[0144] The anode chamber and the cathode chamber are connected in series, and 500mL 0.3mol / L Na 2 SO 4 The aqueous solution is used as a strong electrolyte, and 500mL of 0.5mol / L NaCl aqueous solution is passed into the auxiliary chamber, and 500mL of waste liquid containing low-concentration acid and high-concentration metal ions is passed into the desalination chamber, and the components are 0.6mol / L HCl and 0.75mol / L FeCl 2 , 500mL of water was passed into the concentration chamber. During the experiment, the linear flow velocity of each compartment solution flowing in the membrane stack was 4cm / s, and the current density was kept constant at 20mA / cm 2 .

[0145] The hydrogen ion selective electrodialysis device runs for 30 minutes, stops the experiment, the acid concentration in the wastewater in the desalination chamber can be reduced to 0.050mol / L, ...

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Abstract

The invention provides a device for recovering acid from a waste liquid containing low-concentration acid and high-concentration metal ions through hydrogen-ion selective electrodialysis. The waste liquid containing low-concentration acid and high-concentration metal ions is separated through the hydrogen ion selective electrodialysis device, selective separation of hydrogen ions and the metal ions is realized, recycling of the low-concentration acid in the waste liquid can be realized, and meanwhile, the metal ions in the waste liquid can be directly recycled, or pure metal can be obtained through electrodeposition. The method is simple to operate, and is economical and environmentally friendly, and the low-concentration acid and the high-concentration metal ions in the waste liquid can be recycled and reused, so that the device has good application values, the problem that acid and metal ions cannot be separated from the waste liquid containing low-concentration acid and high-concentration metal ions at present is solved, the problem of deep separation of the low-concentration acid in a diffusion dialysis leachate is also solved, and thus the problem of hydrogen evolution existedwhen the metal ions in the diffusion dialysis leachate are treated by the electrodeposition method is also solved.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a hydrogen ion selective electrodialysis device and method for recovering acid from waste liquid containing low-concentration acid and high-concentration metal ions. Background technique [0002] In industries such as steel, electroplating, titanium, hydrometallurgy, rare earth, and printed circuit boards, inorganic acids such as hydrochloric acid, sulfuric acid, nitric acid, and hydrofluoric acid are usually used to clean metal surfaces or dissolve ores, so there will be a large amount of An acidic waste stream of metal ions is produced. These acid waste liquids often contain high concentration of acid and high concentration of metal ions, or low concentration of acid and high concentration of metal ions. For these acidic waste liquids, the current conventional treatment methods include chemical neutralization, mutual neutralization of acid-base wastewa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/469C02F101/10C02F101/20
CPCC02F1/4693C02F2101/10C02F2101/20C02F2201/46115C02F2201/4618Y02A20/124
Inventor 徐铜文颜海洋汪耀明葛亮
Owner UNIV OF SCI & TECH OF CHINA
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