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.

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

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.

In order to probe the way of abolishing the secondary remelting process of pig iron in Shanghai,some new technologies such as Mini-Mill, Hot charging in EAF, MBF-MiniMill, Fastmet Direct Reduction, Tecnored Process and Cleansmelt Process were analyzed and compared, as well as their mature level, investment and production cost.