• Proceedings of the Korea Air Pollution Research Association Conference
• /
• 2005.11a
• /
• pp.478-480
• /
• 2005

• Proceedings of the Materials Research Society of Korea Conference
• /
• 2003.03a
• /
• pp.231-231
• /
• 2003

• Proceedings of the Korea Air Pollution Research Association Conference
• /
• 2009.10a
• /
• pp.576-578
• /
• 2009

• Journal of the Korean Ceramic Society
• /
• v.41 no.12 s.271
• /
• pp.933-938
• /
• 2004

The clinkerbility and the behaviour of formation of $3CaO{\cdot}Al_{2}O_3$ were studied using the mixture of waste oyster shell and spent oil-refining catalyst mainly by the mineral and microstructural observation. By virtue of the formation of $12CaO{\cdot}7Al_{2}O_3$ at relatively low temperature and its successive reaction with CaO, the $3CaO{\cdot}Al_{2}O_3$ clinkers were formed easily without affection of minor constituents contained in oyster shell. Thus clinkers were formed at $1400^{\circ}C$ directly but began to melt incongruently at higher temperature above that. Aluminium hydroxide, however, was not desirable as an aluminous raw materials of the clinker because rapid melting occurs before $3CaO{\cdot}Al_{2}O_3$ forms main clinker mineral.

• Resources Recycling
• /
• v.20 no.4
• /
• pp.36-45
• /
• 2011

The recovery of platinum group metals (PGMs) from the leach solution of spent auto-catalyst and the wash solution of the leach residue was investigated in the laboratory scale experiments by the cementation process using metal powders as the reductant. In this study, the effect of Al, Mg and Zn powders on the cementation process was particularly examined. Aluminum powder was selected as the most suitable reductant for the cementation of PGMs. At the cementation time of 10 minute under the aluminium stoichimetric amount of 19.3 and the reaction temperature of $50{\sim}60^{\circ}C$, the recovery of platinum group metals from the leach solution of the spent auto-catalyst was found to be 99.3%, 99.4%, 90.2% for Pt, Pd and Rh, respectively. Under the same conditions with the aluminium stoichimetric amount of 45, the recovery of platinum group metals from the wash solution of the leach residue of spent catalyst was observed to be 97%, 97% and 90% for Pt, Pd and Rh, respectively. In addition, it was possible to upgrade the platinum group metals in the precipitates obtained from the cementation process by about 10% through the removal of metal impurities by the nitric acid leaching at ambient temperature.

• Proceedings of the Korean Magnestics Society Conference
• /
• 2003.12a
• /
• pp.172-172
• /
• 2003

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2013.05a
• /
• pp.1373-1374
• /
• 2013

• Proceedings of the Korean Magnestics Society Conference
• /
• 2003.06a
• /
• pp.232-233
• /
• 2003

• Proceedings of the Korean Radioactive Waste Society Conference
• /
• 2018.11a
• /
• pp.436-437
• /
• 2018

• Journal of the Korean Ceramic Society
• /
• v.42 no.7 s.278
• /
• pp.483-489
• /
• 2005

For the raw materials of 3CaO$\cdot$3Al$_{2}$O$_{3}$ $\cdot$CaSO$_{4}$(CSA) clinker manufacturing, the applications of industrial wastes such as waste shell, spent oil-refining catalyst and desulfurized gypsum were examined. The c1inkerbility of the raw mix and the behaviour of formation of clinker minerals were studied and then some hydraulic properties of cements containing the clinker were also investigated. By virtue of the high reactivity of thermally decomposed raw materials, CSA clinkers were obtained at relatively low temperature of 1250$^{\circ}C$ and thus oil-refining catalysts were more desirable than aluminium hydroxide as an aluminous raw material. The expansive cement samples showed somewhat lower flow value than that of OPC, but their compressive strengths were developed earlier and higher than that of OPC due to formation of ettringite in the early hydration time, which indicated the possibility of practical use of low-cost CSA clinker using industrial wastes only.