| 摘要 |
A process line for electrorefining (ER) or electrowinning (EW) of metals comprises an electrolytic cell 321 fitted with at least one anode-cathode pair. Rectified mains power (can be three-phase) is supplied via a transformer 324 and a rectifier, such as a thyristor rectifier 322. In order to reduce the effect of ripple, the frequency of operation of the power supply is raised by incorporating a frequency converter 326, such as a motor-generator set, so that the input to the thyristor rectifier is at a frequency f2 substantially higher than 100 Hz, e.g. 400 Hz. As a result the output of the rectifier contains no ripple components below 360 Hz. Since the impedance of the electrolyte increases at higher frequencies, the deleterious effect of the ripple components is reduced. The frequency converter 326 can be before the transformer, as shown, or after it. |
