Device and method for separating and recycling negative and positive ions in weak solution continuously, synchronously and selectively

Abstract

The invention discloses an electric control ion exchange device and an electric control ion exchange method which are capable of separating and recycling negative and positive ions in a weak solution continuously, synchronously and selectively. The ion separating and recycling device consists of an electroactivity ion exchange function membrane electrode, a controllable rotary closed concentric double-layer sleeve inert electrode, an external power source and a motor system, wherein the electroactivity ion exchange function membrane electrode consists of concentric cylinders and concentric drums which are provided with selective adsorption/desorption negative and positive ions under oxidation/reduction potential; oxidation/reduction potential is alternatively applied to membrane electrodes by an external power supply; meanwhile, the concentric double-layer sleeve inert electrode between the two membrane electrodes is controlled to be opened and closed; negative and positive ions in the weak solution are continuously separated and recycled by being combined with an external liquid path supplying system. An ion exchange membrane or a diaphragm electrode is not required for the device provided by the invention, the structure is simple, and the operation is convenient; ions in the solution are directly adsorbed/desorbed on/from the surface of the membrane electrodes; the ion dispersion and transmitting speed is high, and the separation efficiency is high; the membrane electrode can run continuously.

Description

technical field [0001] The invention relates to a device and method for separating and recovering anions and cations in a dilute solution, in particular to an electrochemically controlled ion exchange device and process for continuous and synchronous selective separation and recovery of anions and cations in a dilute solution, belonging to ion separation and recovery technology field. Background technique [0002] Most of the raw materials and intermediate products in the industrial production process contain various metal or non-metal ion impurities. The removal and purification of these trace impurities often become the key technical issues to improve the reaction efficiency and product quality; in recent years, with the rapid development of industry, there are difficult Various industrial wastewaters that biochemically degrade toxic metal or non-metal ions are increasing, and sudden mass incidents occur from time to time. Because conventional water treatment technology i...

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Problems solved by technology

However, the operation process of this system is complicated and can only achieve the effective separation of a single ion; at the same time, due to the existence of the ion exchange membrane, the ion diffusion transmission resistance is large, the separation efficiency is limited, and a large amount of electric energy is consumed

The continuous and selective separation of anion and cation can be achieved by using a double-diaphragm selective permeation electrode and under the action of the electric field force applied by the auxiliary electrode (ZL 201210229349.3), but the ions need to pass through the diaphragm electrode, the transfer resistance of the ion is large, the separation efficiency is low, and it needs to be applied Inconvenient operation with external electric field

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