| 摘要 |
<p>PURPOSE:To efficiently recover bismuth and mercury in a hydrochloric acid bath by blowing H2S and H2C2O4 into the bath and carrying out electrolysis. CONSTITUTION:When bismuth and/or mercury in a hydrochloric acid bath is recovered, H2S and/or H2C2O4 is blown into the bath and electrolysis is carried out. At this time, the hydrochloric acid bath is prepd. as a bath acidified with hydrochloric acid to >=about 1N, a carbon electrode or the like is used as the anode and a copper plate as the cathode. H2S and/or H2C2O4 is preferably blown into the bath on the anode side. The amount of H2C2O4 blown is about 1.0-1.7 times the reaction equiv. and H2S is blown to such a degree that the electrolytic soln. is not impregnated with the odor of Cl2. The current density is about 30-250A/dm<2> and the temp. of the electrolytic soln. is ordinary temp. Thus, bismuth and/or mercury can be efficiently recovered.</p> |
