PRODUCTION METHOD OF ELECTRO-DEPOSITING AND REFINING METAL CHLORIDE BY MEMBRANE PROCESS AND PREPARATION METHOD FOR CATION SELECTIVE DIAPHRAGM USED THEREIN

摘要

Provided is a production method of electro-depositing and refining a metal chloride by a membrane process, comprising: using a cation selective diaphragm and an anion selective diaphragm to divide an electrolytic cell into an anode chamber, a middle partition chamber and a cathode chamber in sequence, wherein an anode and a cathode, as well as an anode liquor and a cathode liquor are respectively arranged in the anode chamber and the cathode chamber correspondingly; the anode liquor is a diluted sulfuric acid solution, the cathode liquor is an acidic metal chloride solution, and a diluted hydrochloric acid solution is contained in the middle partition chamber; reducing the metal cation at the cathode, and separating out the reduced metal cation in the form of a simple substance while introducing direct current for electrolysis; and simultaneously carrying out a water oxidation reaction at the anode to acquire oxygen gas and acquire 5%-10% of a hydrochloric acid solution in the middle partition chamber. With the adoption of the method, the problem that chlorine gas is generated in a conventional metal chloride electro-deposition process is thoroughly solved, and high-concentration hydrochloric acid by-products which can be recycled and high in economic value can be obtained; and moreover, the acquired metal product has good quality, and the method conforms to the direction of green metallurgical environment-friendly development.