Treatment of blast furnace slag
AssigneesNippon Steel Corporation, Hamada Heavy Industries Co., Ltd.
InventorTakeshi Nagata
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Abstract
A method for treating blast furnace slag comprising cooling and solidifying the slag discharged from the blast furnace with an aqueous solution containing not less than 0.003% ferrous sulfate and/or ferrous chloride.
Claims8
A method for treating blast furnace slag containing sulfides comprising cooling and solidifying the slag discharged from the blast furnace by spraying an acidic aqueous solution containing not less than 0.003% ferrous sulfate or ferrous chloride onto the slag, said aqueous solution having a pH not less than 3.
A method for treating blast furnace slag containing sulfides comprising supplying a part of the circulation water used in a blast furnace gas cleaning system to a blast furnace slag cooling system wherein said circulating water is sprayed onto the molten slag, adding an acidic aqueous solution containing not less than 0.003% ferrous sulfate or ferrous chloride to the circulation water in the blast furnace slag cooling system, and compensating for the lost of circulation water due to evaporation and scattering in both of the systems by supplying water from outside the systems to the gas cleaning system, said aqueous system having a pH not less than 3.
Dependencies are inferred from the claim text.