The Development of Calcium Ferrite Pellet Used as Dephosphorizing or Slagging Agents for Steelmaking and its Application

摘要

In order to meet the demands of slag formation without fluorite the calcium ferrite pellet is developed in laboratory. The lime and iron oxides combining in different proportion are used as raw material of the calcium ferrite pellet. The melting properties of the calcium ferrite pellet is determined in resistance furnace as basis for the optimum recipe. The results of test show that recipe c has better melting, which is used as composition of the calcium ferrite pellet and compared with other slag formation material for their melting characteristics. In order to the target of removing the higher phosphorus of hot metal the calcium ferrite pellet is used as dephosphorization and cooling agents to replace the sintered ore in 300t converter. The results show that the consumption of slag formation material is 71kg per ton steel and the dephosphorization rate of hot metal is over 85% by single slag manner to melting the hot metal with 0.105～0.13% phosphorus using the calcium ferrite pellet. The slag basicity is same, T.Fe content is reduced 3% and P_2O_5 content is increased 0.2% obtained by the calcium ferrite pellet comparing with the sintered ore.