The effects of boronizing treatment（addition amount of B

boronizing temperature and holding time） on the impurity element content and conductivity of commercial purity aluminum were investigated. The results indicate that the conductivity of the alloy is improved to a certain extent by boronizing treatment on the industrial pure Al containing transition elements（Ti

V

Cr

Mn）

>

0.01%（mass fraction） with Al-3.04 B as intermediate alloy. B can react with transition elements to form blocky（Ti

V

Fe）B

2

and flocculent（Ti

V

Fe

Zr）B

2

. Ti and V are deviated out of the solid solution state by boronizing treatment

resulting in the boride precipitation that finally deposits to the bottom of the furnace

thus significantly improving the melt purity and conductivity of the ingot. In addition

considering the property and cost of industrial pure aluminum

the optimal boronizing treatment process is as follows: the addition amount of boron of 0.015%～0.020%

the boronizing temperature of 760 ℃

and the holding time of 60 min

when the impurity element content of industrial pure aluminum is relatively low

and the electrical conductivity can reach 35.88 MS/m.