• Bulletin of the Korean Chemical Society
• /
• v.16 no.1
• /
• pp.9-11
• /
• 1995

• Journal of Conservation Science
• /
• v.28 no.4
• /
• pp.305-319
• /
• 2012

The Myeongdongseongdang Cathedral, which was designated as Historic Site No. 258 in Korea, is a representative cathedral of Korean Catholic church designed by a French priest Eugene-Jean Georges Coste and completed in 1898. It is a Gothic-styled architecture constructed with bricks and stones. Lithological and mineralogical analyses determined that holy stone relics were made of marble and granite, and foundation stones are of pink feldspar granite. Deterioration mapping and ultrasonic measurement revealed main weathering and damage were exfoliation (40%) and black discoloration (37%) in the holy water basin, and exfoliation (6%) and discoloration (46%) in the exterior foundation stones. Ultrasonic velocity of the stones were calculated as 3,525m/s in the holy water basin and 2,795m/s in the exterior stones that indicated these stones were sorted into moderately to highly weathered rock. This was resulted from moisture and atmospheric pollutants around the cathedral.

• Geotechnical Engineering
• /
• v.10 no.2
• /
• pp.178-199
• /
• 1994

• Digital Contents
• /
• no.4 s.131
• /
• pp.18-19
• /
• 2004

• Resources Recycling
• /
• v.31 no.6
• /
• pp.73-80
• /
• 2022

This study investigated the mineralogical characteristics and basic flotation properties of domestic molybdenum ores. The source mineral of molybdenum was identified as molybdenite, and the main gangue minerals in the raw ore were silicate minerals. Copper, lead, and zinc were also found in trace amounts. Based on the results of basic flotation properties, molybdenite's zeta potential showed negative charges in all pH ranges. The contact angle of molybdenite increased with pH, reaching a maximum of 74° at pH 9. In optimal conditions, the grade and recovery of the concentrate by unit flotation were MoS2 82.4% and 92.04%, respectively. Further investigation of the impurities in the concentrate revealed a sulfide mineral with surface characteristics similar to molybdenite and silicate minerals combined with molybdenite, which may degrade the quality of the concentrate. To improve the concentrate quality, we intend to control silicate minerals through regrinding and liberation and use column flotation to improve fine particle separation efficiency.

• Journal of the Mineralogical Society of Korea
• /
• v.31 no.4
• /
• pp.277-285
• /
• 2018

Azurite ($Cu_3(CO_3)_2(OH)_2$) was compressed up to 21.52 GPa for its behaviors at ambient temperature. High pressure experiment was performed using the symmetrical diamond anvil cell employed in the angle dispersive X-ray diffraction method. Pressure was determined by ruby fluorescence calibration method. No phase transitions were observed within the present pressure limit and bulk modulus was determined to be 54.4 GPa when ${K_0}^{\prime}$ is fixed to be 4. Applying the normalized pressure-strain analysis, reliability of the azurite compression pattern was checked.

• Cement Symposium
• /
• s.33
• /
• pp.237-246
• /
• 2006

• 지반과기술
• /
• v.6 no.4
• /
• pp.51-52
• /
• 2009

• 지반과기술
• /
• v.7 no.1
• /
• pp.43-50
• /
• 2010

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2003.10a
• /
• pp.65-65
• /
• 2003