Ceramic pigments were developed by using 4 kinds of Brass scraps. Each Brass scraps were mixed with same weight-ratio of Husk ash, and fine-ground by Rotate ring mill(RRG-120, Armstech industrial. co. Ltd, Korea) after firing at 900℃, 1000℃ and 1100℃. As a result, analysis of particle size of synthetic pigments by particle size analyser, they are 3μm as average. The resulting pigments were characterized by using XRD, FT-IR, SEM Structure of the crystals are Zn2SiO4,, and ZnO, Cu2O, CuO, and cristobalite are existed and particles' shape are plate or needle. As a result of analysis of chemical composition by XRF, synthetic pigments have high SiO2 and CuO content and have SnO2, ZnO and NiO, too. 1wt%, 3wt% and 5wt% pigments were added in each lime glaze, lime-barium glaze and lime-magnesia glaze, and fired at oxidation and reducing atmosphere to figure hue in glazes out. As a result of analysis of color, chroma and brightness by UV, colors of glazes fired at oxidation atmosphere turned into green from sky blue, and colors of glazes fired at reducing atmosphere turned into pink and red.

Fleshing scrap is a kind of wastes produced during leather making process and used in the test of manufacturing biodiesel. The early step of manufacturing biodiesel is fat recovery from fleshing scrap. Hence, we investigated the influence of the way of fat recovery on the fatty acid composition. We used three different recovery ways, that is chemical method by protein decomposition with acid/fat recovering, physical method by protein denaturalization with heat and vacuum/fat pressing, and biodiesel method by protein decomposition/fat recovering. The biological method yielded the best results in terms of appearance transparency. It was most effective to lower acid value. Also the recovered fat by biological method would be favorable methyl-ester reaction raw material for biodiesel because it contains more than 5% of oleic acid among unsaturated fatty acid.

연구로 1,2호기 해체과정에서 발생되는 많은 양의 철재폐기물 중 자체처분대상 철재폐기물을 대상으로 재활용하는 경우에 대해서 피폭방사선량을 평가하고, 규제해제농도기준(안)을 도출하였다. 평가도구는 RESRAD-RECYCLE ver 3.06을 이용하여 ICRP60에서 제시하고 있는 유효선량 개념에 근거한 내부피폭 선량환산인자를 수정하였고, IAEA Safety Series 111-P-1.1 및 NUREG-1640을 적용하여 예상되는 최대개인선량 및 집단선량을 평가하였다. 0.4 Bq/g의 철재폐기물에 대한 RESRAD-RECYCLE 전산코드의 평가결과 개인최대선량 및 집단선량은 23.9 Sv/y, 0.11 manSv/y이다. 최종적인 핵종별 규제해제농도기준은 일반평가방법과 세부평가결과를 종합하여 가장 보수적인 평가결과를 추출하여 결정하였다. 그 결과 , C 핵종에 대한 규제해제농도준위는 1.14 Bq/g미만이 되어야 국내 원자력법에서 정하고 있는 처분제한치(최대개인선량 : 10 Sv/y, 집단선량 : 1 manSv/y)를 만족할 수 있다.

선반 스크랩은 금속 가공 공정에서 선반 및 밀링 작업에 의해 발생된 철강제품의 부산물이므로, 섬유보강 시멘트 복합체 제작시 이 를 활용할 경우 경제성뿐만 아니라 환경 친화적인 효과를 가져온다. 따라서 이 연구의 목적은 강섬유 대체재료로서 선반 스크랩의 활용 방안을 제시하기 위하여 선반 스크랩 보강 시멘트 복합체(LSRCCs)의 작업성 및 강도 특성을 평가하는 것이다. 이를 위하여 금속 가공공장에서 3종류 의 선반 스크랩을 채취한 후 폭 2 mm, 길이 40 mm로 가공하여 LSRCCs를 제작하였다. 그 결과, LSRCCs의 작업성은 플레인 모르타르보다 약 간 저하되었고, 휨강도는 크게 개선되었으며, 선반 스크랩의 종류가 LSRCCs의 특성에 다소 영향을 미치는 것으로 나타났다.

The purpose of this experimental research is to investigate the effect of types of lathe scrap on the characteristics of lathe scrap reinforced cementitious composites (LSRCCs). For this purpose, three types of lathe scraps were collected from processing plants of metal, and then LSRCCs containing these were made for 2mm width and 40mm length. As a result, it was observed from the test results that the compressive and flexural strength of LSRCCs were larger than these of plain mortar and effect of types of lathe scrap on the characteristics of LSRCCs were slightly large.

For material recovery of black carbon and pyrolysis oil, pyrolysis is considered as an alternative to combustion-based technologies for treatment of waste tire. This study investigated the heat transfer optimization in a pyrolysis reactor for waste tire chips with a capacity of 24 t/d. The reactor was required to have a larger heat transfer rate from hot gas to tire chips in the early stage of pyrolysis, whereas the rate in the later stage should be lower. This was to prevent thermal cracking of heavy compounds in the pyrolysis vapor and to improve the quality of black carbon. CFD was applied to analyze the flow and heat transfer in the complex geometry of the reactor for a total of nine design cases. It was found that modifications to control the distribution of gas flow rate along the reactor are more effective for the present reactor than adjusting the measures for heat transfer enhancement (such as fins). The ideal design improvement was to divide the reactor into two gas sections for a separate control of the flow rate, and to remove the fins of which its alignment perpendicular to the flow inhibits the hot gas from approaching the tube of tire chips.

The purpose of this research is to evaluate the mechanical characteristics of lathe scrap reinforced cementitious composites. For this purpose, the cementitious composites containing lathe scrap were made for 2mm width and 40mm length of lathe scrap, and then the mechanical characteristics such as compressive strength, splitting tensile strength, flexural strength, and elastic modulus of the cementitious composites were estimated. It was observed from the test results that splitting tensile strength and flexural strength of the cementitious composites were significantly improved than plain mortar but compressive strength and elastic modulus were only a slightly increased.

The purpose of this research is to evaluate the standard deviation and coefficient of variation for flexural strength of lathe scrap reinforced cementitious composites. For this purpose, the cementitious composites containing lathe scrap were repeatedly made 5 times for water-binder ratio of 30%, 2mm width and 40mm length of lathe scrap, and then the standard deviation and coefficient of variation of the cementitious composites were estimated. It was observed from the test results that the standard deviation and coefficient of variation of the cementitious composites were slightly larger than plain mortar but did not matter much.

The purpose of this research is to investigate characteristics of cementitious composites containing lathe scrap to use it as a alternative materials of steel fiber. For this purpose, the cementitious composites containing lathe scraps were made according to 5mm, 10mm, and 20mm in lengths for their widths of 2mm and 4mm, respectively. It was observed from the test result that the cementitious composites containing lathe scraps were most largely increased than plain mortar in the compressive and flexural strengths when its width is 2mm and its length is 5 to 10mm.

Various foreign materials such as contaminated soil, woody waste, drums containing waste oil, waste transformer, and waste pressure vessel are generated during the collecting and sorting processes of steel scrap. Recently, environmental problems have occurred because of the use of steel scrap that contained contaminants and was not separated properly. And this has also affected the quality of iron products made of steel scrap. Particularly, contaminated soil is highly likely to contain various hazardous substances including heavy metals, which is why proper management standards for contaminated soil are necessary. In this study, concentrations of heavy metals, BTEX, TPH, PAHs, and hazardous materials in contaminated soil were analyzed. It was found that the concentrations of lead and zinc were higher than other heavy metals and iron also showed high concentration. The very high TPH concentration in contaminated soil implies that contaminated soil was polluted by diesel, fuel oil or lubricant. So the comprehensive management regulatory plan and management standard for the hazardous materials are necessary for environmentally-friendly recycling of steel and iron scrap.