| 摘要 |
The invention relates to a process for regulating the acidity of the electrolytic bath by recycling fluorinated effluents emitted by the Hall-Héroult electrolytic cells for the production of aluminum, in which said fluorinated effluents are collected, by the dry route, on the alumina. It comprises the following stages: a reference value for the fluorine/alumina weight ratio is fixed in connection with the alumina leaving the collecting apparatus, a continuous measurement takes place of the fluorine and alumina quantities entering the collecting apparatus, the alumina flow rate is regulated so as to maintain the F/Al2O3 ratio at its reference value, generally fixed between 0.5 and 3%, fluorinated alumina is fed into a storage means with a predetermined capacity and equipped with a level measuring means, the electrolytic cells are supplied with the fluorinated alumina taken from the storage means and the acidity of each cell is adjusted through the addition of aluminum fluoride and/or varying the power dissipated in the cell. |
