METHOD OF MELTING TINNED IRON SCRAP

摘要

The method of the invention comprises a method of melting tin-plated iron type scrap using tin-plated iron type scrap of loose packing as a portion of the iron type scrap and conducting melting while controlling the post combustion ratio of the gas by adjusting the amount of the combustion sustaining gas blown from the secondary tuyeres and a method of melting tin-plated iron type scrap packing the tin-plated iron type scrap prior to the non tin-plated iron type scrap and conducting melting while retaining the tin-melted iron type scrap between the coke packed layer and the non tin-plated iron type scrap packed layer. According to the melting method of the tin-plated iron scrap of the present invention, exhaust gas of high heat generation amount can be recovered while producing pig iron with low Sn content usable for the production of high quality steels by one furnace, without adding a preliminary Sn-removing processing step or molten metal mixing step and without using expensive electric power, by one furnace. Further, an exhaust gas dust in which SnO2 is concentrated can be utilized effectively as an Sn source. Accordingly, the method according to the present invention can be utilized in the field of melting market scrap such as surface treated steels.