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Cu-Pb-S 계 Cu Matte 로부터 Cu 회수에 관한 연구
김병문,김광복,성두용,허달웅 대한금속재료학회(대한금속학회) 2000 대한금속·재료학회지 Vol.38 No.1
The acid/chloride direct leaching of copper matte was experimentally studied for the optimization of the Korea Zinc copper recovery process. In leaching, the effects of key operational parameters such as particle size distribution, concentrations of chloride, sulfuric acid, and ferric ions, and leaching time were studied. The rate of copper dissolution in acid and ferric ions was found to be dependent upon both the leaching temperature and particle size distribution of Cu-matte. The copper recovery rate increased with the decrease in particle size, whereas it increases parabolically with the increase in the leaching temperature from 60 to 90℃. The activation energy of the copper leaching reaction was found to be 12.1 ㎉/mole. In the electrowinning of copper from the filtrate, the surface morphology of electrowon copper was strongly dependent upon the initial concentration of sulfuric acid. The efficiency was also adversely affected by the increasing concentrations of sulfuric acid, chloride ions, and total iron(Fe^(+2) / Fe^(+3)), within our experimental range. The current efficiency decreased with the concentrations of both chloride and total iron. The optimum concentration of sulfuric acid seemed to be 120-140 g/ℓ, while that of total iron was less than 4 g/ℓ.
박미정,조영민,성두용,김미정,박영구 한국유화학회 2013 한국응용과학기술학회지 Vol.30 No.3
Various efforts have been explored to save the cost in many industrial fields. In order to recover the residual thermal energy from the flue gas, an extreme high efficiency heat exchanger is planning to install at a power plant. The gas temperature will be reduced to 40ºC from 115ºC. Thus gas buoyancy decreases, and dispersion of nitrogen oxides is expected to deteriorate as increasing relative humidity. In this study, the conversion of nitrogen monoxide to nitrogen dioxide and dispersion regime are investigated through computational modeling. Nitrogen dioxide which indicates 0.1 ppm at 85 m from the ground could be propagated to 620 m at 115ºC of the flue gas, whilst when cooled down to 40ºC, it expands up to 750 m. The ground level influence area showed more expansion of dispersion, approximately to 930 m.