Lime-based additive for steel smelting and the preparation...

Details Lime-based additive for steel smelting and the preparation... Lime-based additive for steel smelting and the preparation...

2007-12-28

2010-02-09

Lorengo, Jerry (Department: 1793)

Specialized metallurgical processes, compositions for use therei

Compositions

Solid treating composition for liquid metal or charge

C075S766000, C075S768000, C075S771000, C075S773000

Reexamination Certificate

active

07658782

ABSTRACT:
This invention belongs to ferrous metallurgy field, and in particular relates to a lime-based additive for steel smelting which is used in the electric furnace refining and steel casting process for carbureting and deoxidation and the preparation method thereof. The lime-based additive for steel smelting comprises lime-based material and 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 the mixture of the passivated CaO powder and CaCO3powder, 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 %. When the additive has a shape of pellet, and it further comprises 1-5 wt % of agglomerant which has a microstructure of strip, streak or dendritic, and is at least one of MgO, Al2O3, and CaCO3.

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Weiss, SME Mineral Processing Handbook, 1985, Kingsport Press, vol. 1, p. 3A-4.

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