The cell eletrolu00ectica vertical diaphragm to the eletrorefino alloys in chloride bath alumu00ecnio castings for production of quality alumu00ecnio primary

摘要

The "cell eletrolu00ectica vertical diaphragm for the eletrorefino alloys in chloride bath alumu00ecnio castings for production of quality alumu00ecnio primary.The present invention relates to an electrolytic cell vertical compartments of graphite low porosity and a diaphragm thin porous fiber of alumina (998%) in the process of electrochemical refining alloys and / or aluminium scrap, with up to 12% by weight of binder such as Cu, Si, Fe and Mn in quality aluminum primary, with nominal purity of 99.7 mass% of aluminum, resulting in a power consumption less than 5 kwh / kg A1 corresponding to a potential of the cell between 0.8 and 1.3 V, the current densities between 0.1 and 0.3 A / cmu00ac 2u00ac.It is used as electrolyte a mixture of molten chlorides containing 15 to 30% of ALCL ~ 3 ~.Only electrolytes based on chlorides containing ALCL ~ 3 ~, offer the possibility of using diaphragms, porous alumina, the minimum spacing (3 mm).In order to reduce ohmic resistance between the electrodes (between 1 and 4 cmu00ac 87 2u00ac), since the alumina dissolved in molten chlorides concentrations negligible in.Unlike the case of fluorides (state of the art).The electrolytic cell has a working volume of 1000 cmu00ac 3u00ac; an area eletru00f3dica effective 300 cmu00ac 2u00ac and enables operation semi 700 198 C, under inert atmosphere.