After a two-year comprehensive experiment on a series ofseriously old and low-design-level 60KA soderberg reduction cell, whichproved that the electricity effciency limit of this kind of cell canreach between 93 and 95 percent, the average cell voltage is 4.

The present state and problems of Chinese primary aluminum industry and the gap between Chinese and foreign primary aluminum industries are analyzed and reformation and development direction for local small size Soderberg cell aluminum smelters are proposed.

In terms of domestic self-baking cell's conditions,it provides a technical remolding scheme for pre-baking used in the self-baking cell,which lays a foundation for efficiently remolding and expanding small and medium-size domestic aluminium plants.

As the aluminum industry facing the strictly environment claim and the drastic market competition, it is very important to reconstruct of self-baking cell replaced cell by the original pre-baked cell.

However, because of high energy consumption and severe pollution of the self-baking cells, it is urgent to modify them as prebaked cells.

This paper discusses the technological plan to cleaner production of 75kA aluminum cell of pre-bake which is reconstructed from the present 60kA aluminum cell of self-bake.