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趙統來,宋昌彬,後藤左吉 忠南大學校 産業技術硏究所 1997 산업기술연구논문집 Vol.12 No.2
There is Zinc present in the sludge of the Iorn and steel making process. If the Zinc in the sludge can be removed cost-effectively, then the sludge can be used as Iorn ore. The Zinc in the sludge can exist in the form of Zn or ZnFe₂O₄. Out of these two, ZnO reacts with NH₄SCN and forms Zn(SCN)₂which disolves lasily in water. However, ZnFe₂O₄does not react well with NH₄SCN and so it cannot be removed using NH₄SCN. The coke oven gas contains sulphur. The sulphur is removed using ammonia as a medium. During this process, waste liquid solution containing about 11% of NH₄SCN and about 9% of (NH₄)₂S₂O₃is produced in a large quantity. One steel mill produces about 140m3 of this waste liquid per day. This solution is simply treated as waste and thrown out. Instead of throwing it out, if we were to use this NH₄SCN solution to remove ZnO from sludge, them I can be done cheaply. This research aims to know how the NH₄SCN solution, which is produced by the gas emitted from cokes furnace, can be used to remove Zinc from the siudge cost-effectivly and to re-use the sludge as Iron ore.