Jei Pil Wang

Development of Rainwater Purification and Reclaimed Water Treatment Systems Using a High-Efficiency Air-Cooled Ozone Generator

The objective of this study is to improve water quality resulting from rainwater purification treatment and to utilize reclaimed water purification system and high-class treatment purification system. This can be done by developing a purification treatment technique through resolution of discharged ozone problems by circulation-type of ozone treatment method with the use of a high-efficiency air-cooled cylindrical ozone generator. While the final removal rate of BOD showed the highest rate of 96% for 12g without showing a great difference for the ozone injection amount of 9g and 12g, the final removal rate of COD upon treating for 12 minutes showed 73%, 66%, 93% and 96% for 3g, 6g, 9g and 12g, respectively, exhibiting similar treatment results to that of BOD. The removal of TSS and VSS due to ozone treatment was indicated not to have occurred. Also, upon passage of the magnetized water device, the removal rate of colon bacterium and general bacteria was shown to be about 35%, while a high removal rate exceeding 70% was indicated during the initial 3 minutes. Upon final treatment for 12 minutes, sterilization power above 99% was exhibited. Upon treatment using the magnetized water device and the OH- radical generator, not only dissolved suspended materials but also excellent sterilization power appeared to be identifiable.

Reduction of High Nickel-Based Oxide Particles Using Hydrogen Gas

Oxide particles of Fe-77Ni alloy scraps were reduced by hydrogen gas on the effect of temperature and time. The chemical composition of metallic powder was examined by X-ray diffraction (XRD) and FeNi3 alloy was finally obtained with a mean particle size of 10μm.

Recovery of Metal Values from Spent Lithium Primary Battery

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The Effect of Mixing Ratios on Pore Properties of Fe Foam Fabricated Using Slurry Coating Process

Metal foams have a cellular structure consisting of a solid metal containing a large volume fraction of pores. In particular, open, penetrable pores are necessary for industrial applications such as in high temperature filters and as support for catalysts. In this study, Fe foam with greater than 90% porosity, 2-mm pore size was successfully fabricated using a slurry coating process and the pore properties were characterized. The Fe and Fe2O3 powder mixing ratios were controlled to produce Fe foam samples with different pore sizes and porosity. First, the slurry was prepared through the uniform mixing of powders, distilled water, and polyvinyl alcohol (PVA). The amount of slurry coated on the PU foam increased with theFe2O3 mixing powder ratio, but the shrinkage and porosity of the Fe foams decreased, respectively, with increasing Fe2O3 mixing powder ratio.

A Study on the Removal of Solder-Coated Layer of Photovoltaic Ribbon

The oxidation behavior of photovoltaic ribbon was measured for 48 hours over the temperature range of 300°C to 800°C using thermogravimetric apparatus (TGA). It was found that weigh-gained of both samples was found to be increased with increasing temperature and it was dramatically increased at 800°C for 30 minutes of initial oxidation time. Pure copper with 99.55% purity was successfully recovered from the photovoltaic ribbon of spent solar module using cyclic oxidation method.

A Comparative Study on the Oxidation of Fe-25Cr-7Ni-4Mo and Fe-25Cr-7Ni-2Mo-4W Steels

Stainless steel materials (FeCr and FeCrNi-based alloys) are employed in a wide range of modern applications due to their ability to withstand corrosive environments while maintaining good mechanical properties. Their corrosion resistance originates from Cr-rich oxide layer which serves as a barrier against ion diffusion between the alloy and the ambient phase. Custom steel grades can be designed for specific applications by optimizing their properties throughout alloy composition [1].

Development of Batch-Type Electric Furnace for Recovery of Valuable Materials from Spent Batteries

Electric furnace for thermal treatment to recover valuable materials from spent batteries was newly designed to enhance it with safe, efficient, and eco-friendly processes. Spent batteries were handled in the furnace at 500°C for 2 hours under argon atmosphere and they were found to be separated in side reactor with easy. The electrodic powder including valuable metals such as Mn, Ni, Co, Zn, etc. was recovered from bulk components through sieving process.

Development of Continuous-Type Electric Furnace to Recover Metal Values from Waste Mixed Batteries

Continuous-type electric furnace for thermal treatment to recover metal values from waste mixed batteries was newly developed to enhance it with safe, efficient, and eco-friendly processes. Waste mixed batteries were charged continuously into the reactor and handled in the furnace at 500°C for 2 hours under argon atmosphere and they were found to be separated in side reactor with easy. The electrodic powder including valuable metals such as Mn, Ni, Co, Zn, etc. was recovered from bulk components through sieving process.

Development of the Process of Manufacturing Pig Iron for Cast Iron from Copper Slag

A study on the manufacturing pig iron for cast iron from copper slag has been conducted to recover iron-copper matte to be used as a raw material for foundry industries. The copper slag was reduced by carbothermic reaction at 1300°C for 2 hours using electric furnace. Finally, iron-copper matte was successfully obtained with about 93 wt.% and 5 wt.%, respectively.

Oxidation Study of Pure Fe and Fe-36Ni Alloy at Elevated Temperature

There have been many studies on the oxidation of pure iron and steel at different temperatures and pressures. D. Caplan et al. demonstrated the effect of cold-work and metal grain size on the oxidation rate of iron. It was concluded that the oxidation rate of iron was accelerated with temperature, cold-work, and increased oxygen pressure, while the oxidation rate of iron, coarse-or fine-grained, cold-worked or annealed, was found to be the same at the FeO-forming temperature range [1-3].