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산화처리된 PCB 스크랩을 첨가한 Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub>-CaO 3성분계 슬래그의 점도
권의혁,한신석,지재홍,한정환,유병돈,김병수,이재천,Kwon, Eui-Hyuk,Han, Sin-Suk,Ji, Jae-Hong,Han, Jeong-Whan,You, Byung-Don,Kim, Byung-Soo,Lee, Jae-Chun 한국재료학회 2003 한국재료학회지 Vol.13 No.4
In order to explore the possibility to extract precious metals from PCB(Printed Circuit Board) scrap by gravity separation, a high temperature melting process was adopted, from the recycling view point, to investigate the influence of viscosity on A1$_2$$O_3$-CaO$-SiO_2$ slag system composed of PCB scrap. For optimizing the pre-treatment process of PCB scrap, an experimental condition for the complete calcination and oxidation of organic materials in PCB scrap was established and a quantitative analysis of oxidized PCB scrap was also carrie out. It was found that 6 hours were enough for the complete oxidation of PCB scrap at 1273 K in an atmosphere condition. A slag, l5wt%$A1_2$$O_3$-45wt%CaO-40wt%SiO$_2$, was chosen as a basic slag composition which is determined based on the quantitative analysis of PCB scrap. Viscosities were measured in slag systems both made from pure fluxes and from PCB scrap with additional fluxes. Slag viscosities composed of pure fluxes were measured to be 5.29 poise and 30.52 poise at temperatures of 1773 and 1573 K, whereas that of PCB scrap with additional fluxes were 3.37 poise and 69.89 poise, respectively.
Heterogeneity of IL-22-producing Lymphoid Tissue Inducer-like Cells in Human and Mouse
김미연,김수찬,한신석 대한면역학회 2010 Immune Network Vol.10 No.4
Lymphoid tissue inducer (LTi) cells have been characterized in mouse as a key cell when secondary lymphoid tissues are organized during development and memory T cells are formed after birth. In addition to their involvement in adaptive immune responses, recent studies show that they contribute to innate immune responses by producing large amount of interleukin (IL)-22 against microbial attack. Here,we compare IL-22-producing LTi and LTi-like cells in human and mouse and discuss their heterogeneity in different tissues.