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李丙晁,朴冕用,李應孝 건국대학교 1973 學術誌 Vol.15 No.1
Zinc-ferrite시료를 100mesh 이하 되게 분말로 만들어 물에 푼 다음 slurry 상태의 시료 1l(Zn, 50g 함유)에 황산을 이론량의 300%되게 3l를 섞은 후 50psi, 5시간, 200℃에서 용융하여 물 3l씩 세 번 씻어 97% 이상의 아연 회수율을 얻었다. The sample of Zine-Ferrite is powdered through minus 100 mesh and mixed with water (Zn, 50g/l in slurry). The slurry of one litre is mixed with sulfuric acid 300% to stoichiometric amount and digested at 200℃ for five hours. Its pressure is 50 psi. The digested Zinc slurry is washed three times with water and the recovery of Zinc is above 97%.
국산 회중석을 이용한 타이어용 Ice-Spike 제조에 대한 연구
李正根,吳平濟,朴冕用,李應孝,金永基 건국대학교 1972 學術誌 Vol.14 No.1
Tungsten carbides are produced by carburization of tungsten powder and the reduction of ammonium para-tungstate obtained from Korean scheelite. The ice-spike for the automobile tire are made from tungsten carbide mi ed with cobalt powder into various amounts through the process of the double sintering, and the product composed of tungsten carbide 95.5% and cobalt 4.5% is superior to all others. The various physical properties and fabricating conditions far the production of cemented carbide are also discussed. This paper is the starting point of the development leading to wide introduction of the products permitting to ice-spice, cutting tools, etc. by using of Korean scheelite.