METHOD FOR REGULATING AN ELECTROLYSIS CELL

摘要

The invention relates to a method for regulating an electrolysis cell for the production of aluminium by reduction of aluminium dissolved in a melted cryolite bath and includes the addition, in the electrolyte bath, during predetermined time intervals p known as periods , of a determined quantity Q(p) of aluminium trifluoride (AlF3) determined by the following ratio: Q(p)=Qint(p)-Qcl(p)+Qt(p), where Qint(p) is an integral (or auto-adaptive ) term representing the total real requirements of the cell in terms of AlF3 which is calculated from an average Qm(p) of the real intake of AlF3 during the last N periods, Qcl is a corrective term corresponding to the equivalent quantity of AlF3 contained in aluminium added to the cell during the period p, and Qt(p) is a corrective term which is a typically increasing function of the difference between the measured temperature of the bath T(p) and a predetermined set temperature. The inventive method enables efficient regulation of the acidity of an electrolysis cell to intensities of up to 500 kA for an electrolyte bath having an AlF3 content which is greater than 11 %.