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

摘要

The invention provides a novel production method of electro-depositing and refining metal chloride by a membrane process. The novel production method comprises the following steps: 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, a cathode, 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 a acid 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 reduced metal cation in the form of a single simple substance while introducing direct-current power for electrolysis; and simultaneously carrying out water oxidation reaction at the anode to acquire oxygen gas, and 5%-10% of hydrochloric acid solution can be acquired in the middle partition chamber. With the adoption of the production method provided by the invention, the problem that chlorine gas is generated in a normal metal chloride electro-deposition process is solved thoroughly, high-concentration hydrochloric acid byproducts which can be recycled, and high in economic value can be obtained; and moreover, the acquired metal product has good quality, and the method is a novel method satisfying the green metallurgical environment-friendly development.