It was on September 21 that CIE put into operation of its main suction frequency conversion renovation project of Xin Steel No. 7 sintering. 
 

The main suction of a series of projects built by CIE including Brazil GA sintering, Brazil AMM sintering, Baotou Steel sintering, Changzhou ZENITH STEEL sintering, LONGMEN STEEL sintering, Xin Steel sintering, Guangxi Shenglongfeng sintering, etc., operates in frequency control ways with obvious frequency conversion operation & energy saving effect, huge economic and social values, which have obtained 23 national invention patents and 5 declaration for international invention patent, and have leading the position of main suction’s frequency conversion system and control.