Research On Prolong The Life Of Large Pre-baked Aluminium Electrolysis Cell

In china the mean life of the aluminium cell is shorter, average 1500 days. But in advanced countries, the mean life of the same type of aluminium cell can reach about 2500 days. So there is a large gap in the level of aluminium cell between our country and foreign countries. The problem of the life directly affects the production costs and efficiency of electrolytic aluminum industry. So the research on prolonging the life of large cell is very significant and enterprises are trying to overcome this problem. Aiming at the problem, in this work, factors that affect the cell life are researched systematically, then some measures that how to overcome the problems are determined, which has great guidance to aluminum electrolysis.According to more than 20 years' productive practice and the dissection to the breakage of inner liner in aluminium cell, we can know that breakage of the internal liner includes breakage of carbon cathode, breakage of lateral inner liner and breakage of bottom insulating layer been eroded. Then the breakage of internal liner leads to the shortage of the usage lifetime. The breakage mentioned above cause the shorter life of aluminium cell. The factors that affect breakage of the inner liner include the material of furnace, quality of furnace, quality of startup and management of late production. And production management is main influencing factor.The large-scale aluminium electrolyzing cells of 160kA and 300kA are selected to carry out the industry experiments in order to prolong the life of aluminium cells, and the test time is 5 years. The results showed that the following methods are beneficial to prolonging the lifetime of aluminium cells:1) Select the cathode block with high degree of graphitization and related carbon starch;2) Use the bricks of silicon nitride combined with silicon carbide as internal liner, which...