Tetsu-to-Hagané
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ONLINE ISSN: 1883-2954
PRINT ISSN: 0021-1575

Tetsu-to-Hagané Vol. 98 (2012), No. 2

  • Recovery of Molybdenum from Spent Lubricant

    pp. 39-47

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    DOI:10.2355/tetsutohagane.98.39

    The recovery of Mo from spent lubricant by applying high temperature reduction process was investigated. Suitable amounts of lime and ferrous oxide were added to the spent lubricant and the mixtures were reduced by carbon at 1773K. The reaction mechanisms of CaCO3-MoS2-C, CaCO3-MoS2-Fe2O3-C and spent lubricant-CaCO3-Fe3O4-C mixtures were investigated. Mo in spent lubricant was found to be fully recovered as Fe rich alloy. The recovered Fe rich alloy contained about 40mass% Mo and 4.3 mass% C. Thus, Mo recovery from the spent lubricant by carbon in the high temperature process is promising.
  • Recovery of Molybdenum from Copper Slag

    pp. 48-54

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    DOI:10.2355/tetsutohagane.98.48

    Slag as by-product of Cu making has been produced in large amounts in Chile, and around 5 million tons of slag are estimated to be disposed every year and 40 to 45 million tons have been accumulated. Typical Chilean Cu slag contains about 0.3 mass% Mo which is the grade of primary mine production of molybdenite and it also contains about 40 mass% of Fe and 1 mass% Cu. Recovery of Mo from Chilean copper slag is quite attractive to secure a stable Mo supply. The feasibility of the recovery of Mo from Cu slag as Fe-Mo alloys by carbon reduction is investigated in the present work. Mo in Cu slag is found to be fully recovered as Fe rich alloy. The recovered Fe rich alloy contains about 0.65mass% Mo and 2.4 mass% Cu. In addition, to use the recovered Fe-Mo alloy in the special steel industry, which is the most important market for molybdenum, Cu in the produced Fe-Mo alloy is successfully decreased from 2.4 mass% to 0.1 mass% by using FeS-Na2S flux. Thus, Mo recovery from Chilean Cu slag can be promising.
  • Kinetics of Reduction Step of Wustite to Iron of Hematite and Quaternary Calcium Ferrite Mixtures

    pp. 55-62

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    DOI:10.2355/tetsutohagane.98.55

    As a fundamental study for clarifying the reduction phenomena of sintered ore in a blast furnace, mixtures of iron oxide and quaternary calcium ferrite (Cf) were prepared and its kinetic behavior at the final stage of reduction with CO gas was studied. Reduction rate increased with increasing reduction temperature regardless of mineral ratio. Influence of mineral ratio were small and reduction rate were similar in every sample at 1000°C and above. While at 900°C and below, reduction rate increased with increaseng amount of Cf. The reason thought to be due to that the dense iron layer on surface of iron oxide particle inhibits the reduction at inner phase. Reduction reaction proceeded topochemically at higher temperature. On the other hand, reduction reaction did not proceed topochemically at lower temperature. Besides reduction reaction of rich Cf samples proceeded topochemically. Reduction data were analyzed based on the two interface unreacted core model, effective diffusion coefficient in outer layer and inner layer were determined. Reduction curves calculated by using the rate parameters obtained by the analysis agreed with observed data very well at 1000°C and above. Therefore reduction rate of two minerals mixture sample can be analyzed based on the two interface unreacted core model above 1000°C.
  • Determination of Ni in Fe-based Alloys using Low Pressure Laser-Induced Argon Plasma Emission Spectrometry

    pp. 63-68

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    DOI:10.2355/tetsutohagane.98.63

    In order to evaluate the analytical precision in low pressure laser-induced argon plasma emission spectrometry (LIPS), we conducted the determination of Ni in Fe-based alloys to consider the most suitable measurement condition, in particular, a gas pressure of argon and several measuring parameters for time-resolved observation. The selection of emission lines was an important factor to obtain a liner calibration curve depending on the concentration of Ni. The precision was generally inferior to analytical results in XRF and ICP-OES. However, the analytical value of Ni was obtained with good reliability, by averaging during replicate measurements. It was further shown the Ni content in Fe-Ni-X alloys would be determined by using calibration curves estimated from binary Fe-Ni alloys.
  • Effect of Mn Contents on Fatigue Properties of Plasma-Nitrided Fe-C-Mn Steels

    pp. 69-74

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    DOI:10.2355/tetsutohagane.98.69

    Rotating bending fatigue tests were conducted for a series of plasma-nitrided Fe-C-Mn steels in order to investigate the effect of manganese contents. 5 types of steels were prepared, i.e., 0.0Mn, 0.5Mn, 1.0Mn, 2.0Mn and 4.0Mn. Microstructures of the steels were ferrite-pearlite except 4.0Mn whose microstructure was martensite. 2.0Mn and 4.0Mn of the nitrided specimens had a hardened layer of 0.5 to 1 mm in depth, while the no hardening was observed in 0.0Mn, 0.5Mn and 1.0Mn of the nitrided specimens. In case of 0.0Mn, 0.5Mn and 1.0Mn, the nitrided specimen showed surface fracture and increase of fatigue strength was very small. The 2.0Mn nitrided specimen showed surface fracture and fatigue strength were largely improved by plasma-nitriding. On the other hand, in case of 4.0Mn, the nitrided specimen showed internal fracture beneath the hardened layer and the fatigue strength were lower than that of the 2.0Mn nitrided specimen.

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