Diaphragm-free electrochemical lithium extracting system and method

Abstract

The invention relates to a diaphragm-free electrochemical lithium extracting system and method. The system is mainly composed of an electrolysis tank, a washing tank, a power supply, and a series of desorption lithium batteries and electronic balance electrodes, wherein the electrolysis tank is divided by a series of partition plates into raw material pools and recovery pools at sequential alternating positions, and the different raw material pools and the different recovery pools are connected in series through connecting pipes correspondingly. A to-be-extracted lithium raw material and recovery liquid are introduced into the raw material pools and the recovery pools correspondingly, and the electrodes are switched between the raw material pools and the recovery pools, so lithium is separated out of the raw material and enriched in the recovery liquid. By means of the system, the grade of the electrolysis tank can be easily improved or lowered, or the position exchange frequency of the electrodes is controlled, and therefore the lithium extracting requirement of different lithium-containing solutions is met. According to the system, in the lithium extracting process, a raw material circuit and a recovery liquid circuit are independent of each other and continuously operate, and therefore the continuous electrochemical lithium extracting can be realized. In addition, since onlythe regular movements of the electrodes are related in the lithium extracting process, automatic operation is easily realized.

Description

technical field [0001] The invention belongs to the field of inorganic chemical industry and relates to the separation and extraction of elements, in particular to a continuous electrochemical lithium extraction system without diaphragm and a lithium extraction method thereof. Background technique [0002] Nearly 40 million tons of lithium resources have been identified in the world, of which the reserves in brine (including salt lake brine, underground brine, concentrated seawater, etc.) account for about 70% of the total reserves. Due to the unrestrained exploitation of limited high-quality solid ore resources and the cost and scale advantages of extracting lithium from brine, the development and utilization of lithium brine resources has become an inevitable trend. [0003] Based on the principle of lithium-ion batteries, the use of electrochemical ion pump technology to extract lithium from complex brines has become the most advanced technology in current research. Elec...

AI Technical Summary

Problems solved by technology

However, during the lithium extraction process of this device, the adsorption and desorption of lithium are carried out independently and alternately step by step, so continuous lithium extraction operation cannot be realized.

Although the patent CN201811172404.3 discloses a continuous electrochemical element extraction system, the lithium extraction system uses an anion exchange membrane, and only one electrode is transferred from the extraction tank to the recovery tank at a time, so the extraction efficiency of lithium is low and high energy consumption

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