Through analyzing and inspecting each metallurgical property of natural lump ores from main habitats in the world by experiment, the article indicates that the lump ores' metallurgical properties can meet a modern blast-furnace except the softening and melting properties.

The experimental study of adding MgO-bearing additives in acid pelletizing process, including balling,firing and product pellets metallurgical property, in ANSTEEL shows that :under the usual fired temperature of the traveling-grate, the cold compression strength of product pellet is more than 2 500 N/P when the pellets contain the mass percent of MgO/SiO2 in the range of 0.

In order to raise the metallurgical property of pellets and the stabilize of the ironmaking furnace,the ability of linking crystal and the microscopic characteristics of balling iron concentrtes are studied through the characteristics of production technology and the raw materials condition at Nansteel.