Method and device for producing potassium iodate through oxygen cathode non-diaphragm electrolysis

Abstract

The invention relates to a method and device for producing potassium iodate through oxygen cathode non-diaphragm electrolysis. In the device in the invention, the mixed solution of potassium iodide and potassium hydroxide is used as electrolyte, wherein iodine ions are oxidized at the anode to generate iodate ions, oxygen is reduced at the cathode to generate hydroxyl ions; the liquid generated by electrolysis is cooled to precipitate potassium iodate crystals; and after potassium iodide and water are added in mother liquor, the mixture is send back to the electrolytic cell for electrolysis. The cathode of the electrolytic cell is an oxygen-consuming cathode and the anode is a corrosion resistant non-sacrificial anode, thus the cationic film or diaphragm is not required and the reduction of iodate ions at the cathode can be avoided. The method is obviously characterized in that the cell voltage is only about 0.6-1.0V, thus the energy consumption can be greatly reduced; the whole flow is performed circularly; and the electrolytic cell has simple structure, no ion film and low operating cost.

Description

technical field

[0001] The invention provides a method and a device for preparing potassium iodate by electrochemical electrolysis, in particular a method and a device for preparing potassium iodate through electrochemical oxidation of an anode without a diaphragm by replacing the existing hydrogen evolution cathode with an oxygen reduction cathode. technical background

[0002] At present, the industrial preparation methods of potassium iodate mainly include potassium chlorate oxidation method, concentrated nitric acid oxidation method, hydrogen peroxide oxidation method and electrochemical oxidation method. Utilizing potassium chlorate to oxidize elemental iodine is the mainstream process for the production of potassium iodate in my country, but because the oxidation of potassium chlorate needs to be carried out under acidic conditions, the requirements for equipment materials are high; in addition, iodate is easy to react with iodide ions to form iodine under acidic condit...

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