反应详情

温度

80 °C

Zinc oxide and lead compounds can be dissolved in 2:1 urea-choline chloride and the respective metals subsequently electrodeposited onto a suitable cathode. Oxides of Fe, Al, Si and Ca were found to be almost totally insoluble in the above ionic liquid. Urea-choline chloride ionic liquid was prepared by combining urea (0.02 moles) with choline chloride (0.01 moles) in a beaker and heating at 80° C. Arc furnace dust (0.5 g) was added to the resulting clear colourless liquid and the mixture was heated at 80° C. for 1 hour. After 1 hour a brown suspension was obtained which was transferred to an electrochemical cell. Metal electrodeposition was achieved using a nickel cathode and a titanium anode (both electrodes were 50 mm by 10 mm and 1 mm thick) and applying a potential difference of 3.5 V for 1 hour. Prior to electrodeposition the electrodes were gently abraded with glass paper and cleaned with acetone. After 1 hour of electrodeposition the nickel cathode was removed from the brown suspension, washed with acetone and dried. A thick charcoal coloured deposit was obtained. The electrodeposited material was analysed using Energy Dispersive Analysis by X-rays. The results of the analysis revealed the presence of lead (77%), zinc (16%) and copper (7%). There was no trace of iron in the deposit thus showing that zinc oxide and iron (III) oxide can be separated and harmful lead compounds removed from arc furnace dust.

1. temperaturethe mixture was heated at 80° C. for 1 hour
2. customAfter 1 hour a brown suspension was obtained which
3. customfor 1 hour
4. customAfter 1 hour of electrodeposition the nickel cathode was removed from the brown suspension
5. washwashed with acetone
6. customdried