Control principle of the automatic air adjusting system of medium and small blast furnaces and realization method of con-trol mode were presented, The automation system has been used successfully for the blast furnace air supply system.

Control principle of the automatic air adjusting system of medium and small blast furnaces and realization method of control mode were presented,and the technical difficulties and countermeasures in implementation were also described.

A modification to small-sized blast furnace complex: belt conveyance of pellet and coke;

In this paper, the price formation of natural fuel in the recovery production of small blast furnace in Baguan River Hard-Wearing Cast Plant and prices of cast pig iron in the major cities of the mainland were briefly introduced; cost of production in the recovery production of this blast furnace was bugeted and analyzed ; ways to decrease its cost were put forward.

The text compared the large with the small blast furnace s investment & sociality from design and practice index.

Slopping is the main cause of increasing the consumption of iron and steel materials in medium and small sized converter.