METHOD FOR ELECTROLYTICALLY COLLECTING METAL FROM AQUEOUS SOLUTION CONTAINING MINOR AMOUNT OF METAL

摘要

PURPOSE:To electrolytically collect metals from an aq. soln. contg. nobler metals than zinc with respect to the normal electrode potential by using a fixed-bed single-bed electrode electrolytic cell and electrolyzing an aq. soln. contg. minor amt. of metals under specified conditions. CONSTITUTION:The fixed-bed single-bed electrode electrolytic cell to be used is composed of an electrolytic diaphragm 4 for separating the electrolytic cell 1 into an anode chamber and a cathode chamber, an anode plate 2 and a cathode plate 3 which are respectively arranged in the anode chamber and the cathode chamber and an electrically conductive substance filled between the diaphragm 4 and the cathode plate 3. When an aq. soln. contg. a minor amt. of metals is electrolyzed, an aq. soln. contg. a minor amt. of nobler metals than zinc with respect to the normal electrode potential is used as the electrolyte. Besides, the space velocity (SV) is controlled to the extent that the conductive substance in the cathode chamber is not fluidized, the current density to the cathode plate 3 is adjusted to 0.01-1.5A/dm<2> and the interval between the cathode plate 3 and the diaphragm 4 is regulated to a prescribed value in accordance with the electric conductivity of the objective aq. soln.