A High Current Density Circulating Flow Anode Diaphragm Electrolyzer

Abstract

The invention relates to a high current density circulating flow anode diaphragm electrolyzer. Anode frames are fixed on an upper fastening pull rod; cathode frames are fixed on a lower fastening pull rod; diaphragm bags are sleeved outside the anode frames; anode plates are fixed on the anode frames; anode plate regions are formed in the anode frames; cathode plates are fixed on the cathode frames; cathode plate regions are formed outside the anode frames; electrolytic tank walls at one sides of the cathode regions are provided with catholyte circulating spraying devices; and the other sides of the cathode regions are provided with catholyte circulating return devices. The high current density circulating flow anode diaphragm electrolyzer has the beneficial effect that the anode frames are sleeved in the diaphragm bags and a circulating flow device is arranged, so that the catholyte circulating flow is improved, the migration rate of metal cations is improved, the high cathode current efficiency and a high-quality cathode product under the condition of the cathode high current density are implemented, the aims of greatly improving the current density and obviously improving the unit production capacity of the electrolyzer are fulfilled and the production operation cost is effectively reduced.

Description

technical field [0001] The invention relates to a diaphragm electrolysis device, in particular to a high current density circulating flow anode diaphragm electrolysis device. Background technique [0002] At present, the traditional diaphragm electrolysis device places the cathode and anode in the tank where the electrolyte flows slowly, and each cathode is placed in an independent diaphragm bag. Under the action of the electric field, the anions move to the anode and the cations move to the cathode. , by controlling certain technical conditions, the target metal cations are electrolytically deposited and precipitated at the cathode, thereby obtaining high-purity electrolytic products. Since the electrode reaction speed is often faster than the ion diffusion speed, concentration polarization is formed. In the traditional electrowinning cell, it is precisely because of the concentration polarization of the cathode that a small amount of impurity ions or hydrogen ions are pre...

AI Technical Summary

Problems solved by technology

In the traditional electrowinning cell, it is precisely because of the concentration polarization of the cathode that a small amount of impurity ions or hydrogen ions are precipitated on the cathode together with the target metal ions. On the one hand, the quality of the cathode product is reduced, and on the other hand, the cathode current efficiency Significantly reduced, thereby increasing energy consumption per unit of product

At the same time, the traditional diaphragm electrolysis technology generally uses the cathode diaphragm bag to realize the unidirectional flow of the solution, and each cathode diaphragm bag is relatively independent, so that the catholyte in the bag cannot achieve high-speed flow

Therefore, the traditional diaphragm electrolysis technology is used for metal purification or electrolytic deposition. In order to ensure high cathode current efficiency and cathode product quality, the current density must be controlled within a low range, resulting in a large electrolysis system and equipment investment costs. High, low production efficiency

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