Abstract： To improve the strength of high phosphorus hematite-carbon pellets, the surface area and pore structure of high phosphorus hematite powders were studied by an adsorption instrument. Through analyzing the surface area， pore volume and pore size, the relationship between strength of pellets and amount of carbon was investigated. Microstructure was observed by means of microscopic method to obtain reason for small strength of the pellets. The results show that adsorption isotherms of the high phosphorus hematite powders are identified as B class adsorption back lines, and pore structure is slit-shaped pores. The strength of high phosphorus hematite-carbon pellets increases first and then decreases with the increase of carbon content. Many pores unevenly distributed are generated inside the high phosphorus hematite-carbon pellets and there are cracks exist, which lead to loosen structure and decreasing pellet strength.

Keywords: high phosphorus hematite; pellet strength; surface area; pore volume; pore size