DEPHOSPHORIZATION METHOD IN THE PROCESS OF SMELTING NI-CR PIG IRON FROM A NICKEL OXIDE ORE

摘要

A dephosphorization method in the process of smelting Ni-Cr pig iron from a nickel oxide ore compi basicity oft lica, then adding limestorses the following steps: adjusting the heraw ore to 0.4-0.7 by adding limestone or si ne and coke powder, sintering to obtain sintered ore with abasicity of 0.5-0.7, and smelting the sintered ore to obtain Ni-Cr pig iron, in which the amount of the coke powderin the sintering process is 9-17% based on total weight, P content ofthe coke is not greater than 0.016%, P content of the limestone is not greater than 0.008%, P content of the raw ore is not greater than 0.012%.The P content could be reduced to lessthan 0.035% in one pass and in low cost without contamination by using the method.