The production mode with high aluminum level,general molecular ratio,low electric voltage and strengthening corner insulation could overcome the negative inflence that high aluminum level brought completely.

Determination of molecular ratio of aluminium electrolyte by using X-ray fluorescence spectrometry;

Computer system for search and analysis of molecular ratio in Al electrolyte;

Through changing tranditional operation process and using of half pressing casing process and practising the operation of "low molecular ratio,low voltage,low alumina and high aluminium level"the current efficincy is greatly increased and comprehensive power consumption of electrolytic aluminium production is decreased by 439kW.

The industrial experiment of lower molecular ratio bath process was achieved on four horizontal stud Soderberg cells in Shandong aluminium industry corporation.

The process system which points out the adoption "segment control,gradual reduce of heat to decline molecule ratio" can succeed in constructing more standard high molecule ratio hearth.

Effect of cooling speed and grain size of sample on measurement of molecule ratio for Al electrolyte have been discussed in the paper.