Abstract: In order to explore the process of converter using limestone instead of lime and doubleslag for dephosphorization, the test results of 100 t converter using limestone and double-slag in a steel plant were studied, and the advantages of limestone slagging for dephosphorization are analyed theoretically. The test results show that the dephosphorization rate of test furnace is 88.67 % on average. Compared with lime and double-slag process, the average CaO charging amount of limestone and double-slag process is reduced by about 29.45 %,which means the new process can further reduce the consumption of materials and slag amount. And the dephosphorization rate improves with the increase of limestone adding batches.

Key words: converter steelmaking, double slag, limestone, dephosphorizatione, less slag smelting