A device for continuous separation of anions and cations in solution and its application method

Abstract

The invention discloses a device for continuously separating negative and positive ions from a solution and an application method of the device. The device comprises a central cylindrical membrane electrode, an arc-shaped counter electrode, a cylindrical insulating shell, a motor control device, an external power supply and a flexible contact type sealing unit, wherein the central cylindrical membrane electrode has an electric control ion exchange function; the flexible contact type sealing unit is used for uniformly distributing an annular chamber between the central membrane electrode and the external arc-shaped counter electrode into a raw material liquid chamber and a regenerated liquid chamber; raw material liquid and regenerated liquid are injected to the raw material liquid chamber and the regenerated liquid chamber respectively; different potentials are applied to the central membrane electrode and the external arc-shaped counter electrode respectively, and adsorption of the membrane electrode on target ions in the raw material liquid and desorption of the membrane electrode in the regenerated liquid can be continuously finished. According to the device disclosed by the invention, a liquid patch does not need to switched, the sealing effect is good and the operation is convenient; the ions in the solution are directly adsorbed / desorbed on the surface of the membrane electrode; the ion transferring speed is rapid and the ion separation efficiency is high; the membrane electrode can be operated continuously.

Description

technical field [0001] The invention relates to a device for continuously separating anions and cations in a solution and a method for using the same, belonging to the technical field of ion separation and recovery. Background technique [0002] The raw materials and intermediate products in the industrial production process often contain various metal and non-metal ion impurities. These trace impurity ions will corrode the reactor and induce side reactions, thereby reducing the reaction efficiency and product purity. Especially in recent years, the discharge of wastewater containing toxic metals or non-metal ions that are difficult to biodegrade is increasing, and the problems of drinking water and food safety caused by this are not uncommon. On the other hand, the toxic metal or non-metal ions contained in industrial wastewater, such as rare earth and other precious metals, are also an important strategic resource. Therefore, the effective separation and recovery of these ...

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Problems solved by technology

Chinese patent CN102583664A discloses a diaphragm reactor composed of an ion exchange membrane and a set of ESIX membrane electrodes. By alternately applying oxidation / reduction potentials to the membrane electrodes, combined with an external liquid supply system, continuous electronically controlled separation and recovery of single ions can be achieved. , but the operation process of the system is complicated and requires additional circuits and liquid circuit switching systems, and the operating cost is high

This separation process does not need to switch the liquid path, but the ions need to pass through the diaphragm electrode, the ion transfer resistance is large, the separation efficiency is low, and an external electric field is required to operate, which is inconvenient

Chinese patent CN104587835A discloses a sleeve-type reactor. By controlling the opening and closing of the concentric double-layer sleeve inert electrode, combined with an external power supply to alternately regulate the oxidation / reduction potential of the membrane electrode, the continuous separation and recovery of anions and cations can be realized. However, this process requires additional circuits and hydraulic switching systems

At the same time, because the process does not consider the separation and sealing of the treatment liquid and the regeneration liquid, the common chamber of the treatment liquid and the regeneration liquid will interfere with each other and reduce the separation efficiency, which is not conducive to industrial application

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