Patent ID: 7658782

Claim:
A lime-based additive for steel smelting, which comprises a lime-based material and a carbonaceous material, wherein the content of the lime-based material is 40-80 wt % relative to the total amount of the additive, and the remaining is the carbonaceous material; the lime-based material is a passivated CaO powder with a low flowability, or a mixture of the passivated CaO powder and CaCO 3 powder, and the carbonaceous material is at least one of the coke, graphite, semi-coke powder and coal with carbon content not less than 85 wt %; and wherein the additive has a shape of pellet, and it further comprises 1-3 wt % of agglomerant which has a microstructure of strip, streak or dendritic, and is at least one of MgO, Al 2 O 3 , and CaCO 3 .