| 摘要 |
A method of protecting a cathode during the start-up procedure of an aluminum electrowinning cell where the cathode is optionally coated with an aluminium-wettable refractory material and when in use, aluminium is produced thereon. The start-up procedure comprises applying, before preheating the cell, one or more start-up layers in intimate contact on the aluminium-wettable refractory coating which form(s) a temporary protection against damage of chemical and/or mechanical origin to the aluminium-wettable coating; this temporary protection being eliminated before or during the initial normal cell operation. The temporary protection layers may be obtained from at least one pliable aluminium foil having a thickness of less than 0.1 mm and/or an applied aluminium-containing metallization, optionally in combination with inter alia a boron-containing solution, a polymer, a phosphates of aluminium-containing solution, or a colloid that gels while preheating the cell, or combinations thereof.
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