| 摘要 |
<p>A thermally insulated cell for electrolytic purification of aluminum comprises a trough with a steel shell which is surrounded by an outer wall, is lined with a material which is resistant to electrolyte and high temperatures, and is closed by a lid; an electrolyte based on alkali metal chlorides; segregation wells for the addition of aluminum which is to be purified and for the precipitation of impurity crystals; a supply means which is used to feed-in electrolyte material and is also conceived as a waste gas extractor; a collection and run-off system for the high purity aluminum; provided in the interior of the cell are bipolar electrode units which are connected electrically in series and are arranged immersed in the electrolyte parallel to the end electrodes; the electrode units comprise graphite frames closed and sealed off by diaphragm plates, which can be wet by the electrolyte but not by the aluminum; the inter polar distance between the inner side of the diaphragm plate and the cathodic graphite frame is preferably 10-25 mm.</p> |
