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MgO와 Spinel의 첨가에 따른 Al₂O₃- C질 내화벽돌의 특성
손건목,김혜림,이홍림 연세대학교 산업기술연구소 1999 논문집 Vol.31 No.2
The behavior of spinel in the Al₂O₃-MgO-C and Al₂O₃-Spinel-C brick based on the Al₂O₃-C system has been investigated. In the Al₂O₃-MgO-C brick, the amount of spinel phase increased with an increase of sintering temperature and soaking time, and residual linear expansion was increased as a result, while the modulus of rupture decreased due to microcrack. Small MgO particle accelerated the spinellization process in the Al₂O₃-MgO-C brick because the smaller the particle size is, the larger the specific surface are is The Al₂O₃-C and Al₂O₃-Spinel-C brick had the similar residual linear expansion behavior and thermal expansion but residual linear expansion was not large enough to reduce the penciling phenomena in brick lining. It was clear that the resistance for high basicity slag and the spalling resistance were improved when the spinel was formed in the Al₂O₃-MgO-C brick during operation or the spinel clinker was used as a raw material for brick such as Al₂O₃-Spinel-C system.
Ji Yeon Lim(임지연),Yeong Gyeong Kang(강영경),Keon Mok Sohn(손건목),Pil Joo Kim(김필주),Snowie Jane C. Galgo(스노위 제인 갈고) 한국토양비료학회 2021 한국토양비료학회 학술발표회 초록집 Vol.2021 No.11
Blast furnace slag(BFS), a by-product of iron making process, has been utilized as a silicate fertilizer in Korean and Japanese rice paddy to improve rice productivity. Silicate fertilizer has high contents of active iron and manganese known as an electron acceptor, so it could inhibit methane (CH₄) production during rice cultivation. To evaluate the effect of silicate fertilization on suppressing CH₄ emissions, the changes of CH₄ index, indicating the ratio(%) of seasonal CH₄ flux at the silicate fertilization treatment to that at the control, were generalized using the global investigation data (42 observations from Bangladesh, China, and Korea). Seasonal CH₄ fluxes significantly decreased with increasing silicate fertilization levels. In CH₄ index changes, 1.5 Mg ha<SUP>-1</SUP> of silicate fertilizer application (the recommended level of rice cultivation in Korea) decreased by 15% of seasonal CH₄ fluxes. Rice grain yield highly increased with increasing silicate fertilization rates and maximized approximately at 4 Mg ha<SUP>-1</SUP> with 18% higher than no-silicate fertilization due to overall improvement of soil properties. With this yield response, 1.5 Mg ha<SUP>-1</SUP> of silicate fertilizer application could increase approximately 12% of rice grain productivity. The application of silicate fertilizer having high pH and high contents of Ca, Fe, Mg, and SiO₂ was effective to increase pH and these element contents in soils. Two Mg ha<SUP>-1</SUP> year<SUP>-1</SUP> of silicate fertilization increased soil pH by 0.05-0.6, available P₂O<SUB>5</SUB> and SiO₂ contents by approximately 32 and 69%, respectively, and exchangeable cation (Ca, K, and Mg) contents by more than 30% over the control. In conclusion, BFS-based silicate fertilizer could be a beneficial amendment to mitigate CH₄ emissions in the rice paddy and improve soil properties and rice productivity.