| 摘要 |
PURPOSE: A method for improving granulation strength at low temperature reduction of sintered ore by spraying of carbon dioxide is provided which improves granulation strength at low temperature reduction in a blast furnace by inducing closing of pores and precipitation coating the surface of the sintered ore through addition of CaO and spraying of CO2 to sintered ore so as to solve problems on deterioration of permeability and corrosion of facility due to granulation strength at low temperature reduction in a blast furnace. CONSTITUTION: In a method for improving granulation strength at low temperature reduction of sintered ore produced in the sintering process, the method comprises the process of spraying an aqueous solution of calcium oxide (CaO) and ejecting CO2 gas to the surface of sintered ore so that a CaCO3 compound is precipitated in pores inside the sintered ore and in voids and on the surface of vulnerable structure, wherein the calcium oxide has a pH of 7 or more, and a concentration of 20% or more.
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