• Title/Summary/Keyword: 정광산

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Comparison of Temperature and Light Intensity Effects on the Photooxidation of Toluene-NOx-Air Mixture (온도와 광도가 톨루엔-NOx-공기 혼합물의 광산화 반응에 미치는 영향의 비교)

  • Ju, Ok-Jung;Bae, Gwi-Nam;Choi, Ji-Eun;Lee, Seung-Bok;Ghim, Young-Sung;Moon, Kil-Choo;Yoon, Soon-Chang
    • Journal of Korean Society for Atmospheric Environment
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    • v.23 no.3
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    • pp.353-363
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    • 2007
  • To differentiate temperature effect from the light intensity effect on the formation of secondary products during the photooxidation of toluene-$NO_x$-air mixtures, steady-state air temperature was changed from $20^{\circ}C\;to\;33^{\circ}C$ at the same light intensity of $0.39min^{-1}$ in an indoor smog chamber. Smog chamber consisted of 64 blacklights and a $5.8m^3$ reaction bag made of Teflon film. Air temperature was controlled by an air-conditioning system. The starting time for rapid conversion of NO to $NO_2$ was slightly delayed with decreasing air temperature. In contrast to light intensity effect, the ozone formation time and the ozone production rate were insensitive to air temperature. Although the formation time for secondary organic aerosols was not changed, the particle number concentration increased with temperature. However, the newly formed secondary organic aerosol mass at lower temperature was higher than that at higher temperature. Since light intensity significantly affected the starting time and quantity of ozone and aerosol formation, it is considered that the temperature could contribute partly the quantity of aerosol formation during the photooxidation of toluene-$NO_x$-air mixtures.

The Quality Properties of Mortar for Using Tailings from the Sangdong Tungsten One as Admixture for Concrete (상동광산 광미를 콘크리트용 혼화재료로 사용하기 위한 모르타르의 품질특성)

  • Choi Yun-Wang;Jung Moon-Young;Jung Myung-Chae;Koo Gi-Jung
    • Journal of the Korea Concrete Institute
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    • v.16 no.3 s.81
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    • pp.383-390
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    • 2004
  • This study has focused on the possibility for recycling tailings from the Sangdong tungsten mine as admixture for concrete. The XRD(X-ray diffraction analysis) and PSA(Particle size analysis) were performed to find mineralogical characteristics. As a result of XRD analysis, the tailings from the Sangdong tungsten fine were composed of quartz, chlorite, anorthite and cordierite etc. As a result of KSLT for cement mortar mixed with tailings from the Sangdong tungsten mine, most of heavy metals were determined as below the guide line for waste material. In addition, the setting time and compressive strength of cement mortar mixed with tailings from the Sangdong tungsten mine were investigated. It was indicated that the initial and final set were retarded according to increasing replacement of tailings from the Sangdong tungsten mine. The compressive strength of mortar was decreased with increasing replacement of failings from the Sangdong tungsten mine.

Remediation Design of Acid Rock Drainage (ARD) from Goro Abandoned Mine (고로폐광산 침출수 처리대책 설계)

  • Choi, Jung-Chan;Lee, Min-Hee
    • Journal of Soil and Groundwater Environment
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    • v.9 no.2
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    • pp.1-10
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    • 2004
  • The purpose of this study is to evaluate a laboratory test on arsenic reduction efficiency for ARD (Acid Rock Drainage) using limestone and apatite, and to design an apatite drain system. As a result of the laboratory test, results of this study show that pH, arsenic removal ratio, and dissolution amount of limestone & apatite are inversely proportional to flow rates, and apatite removes 100% of arsenic at 0.6 ml/min/kg flow rate. It is supposed that dissolution rate of apatite is ten times higher than that of limestone. The arsenic compounds are assumed to be Johnbaumnite, and/or Ca-arsenic hydrate. According to the results of the laboratory test, apatite drain system is designed as follow; Sixty two tons of apatite will be needed per one year and six months, and the precipitates will be removed from the precipitation pond per 3 months.

Quantitative Analysis of Platycodin D from Platycodon grandiflorum by HPLC-ELSD (HPLC-ELSD법에 의한 길경의 platycodin D 정량분석)

  • Kim, Geum-Soog;Kim, Hyun-Tae;Seong, Jae-Duck;Park, Hee-Saeng;Kim, Soo-Dong
    • Korean Journal of Medicinal Crop Science
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    • v.10 no.3
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    • pp.200-205
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    • 2002
  • Platycodin D was isolated from n-butanol extract of Platycodi radix(Platycodon grandiflorum and identified by the spectroscopic analysis using $^1H$ and $^{13}C$ NMR techniques. A new method of analysis of platycodin D by high performance liquid chromatography(HPLC) was established using a reversed phase system with YMC-Pack ODS-AM( 250 X 4.6 mm) column and 30% acetonitrile as a mobile phase. Evaporative light scattering detector was used as detector. The kinds of extraction solvents and methods were examined to determine the efficient extraction condition and HPLC analysis was carried out to establish the optimum drying condition for the root of Platycodon grandiflorum. The contents of Platycodin D was highest as 0.083% when platycodon roots were dried at $60^{\circ}C$ using dry oven.

Determination of Metals of Coal and Respirable Coal Dust in Gangneung and Taebaek Coal Mines (강릉·태백지역 석탄광산의 탄 및 호흡성 탄분진중 금속 농도 비교에 관한 연구)

  • Kim, Hae Jeong;Choi, Ho Chun;Chung, Ho Keun
    • Journal of Korean Society of Occupational and Environmental Hygiene
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    • v.1 no.1
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    • pp.82-88
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    • 1991
  • Determination of Cu, Fe, Ni, Pb, and Zn concentrations in coal and respirable coal dust were performed by atomic absorption spectrophotometry. The coal samples of 18 coal mines in Gangneung area were collected and 25 coal mines in Taebaek area. Crushed coal samples were divided into three mesh sizes. The results were as follows : 1. Metal concentrations of coals in Gangneung area by sieve sizes( -100/+200 mesh, -200/+325 mesh, -325 mesh) were as follows: Cu ; 20, 18, 19, Fe ; 1,830, 1,765, 1,107, Pb ; 6, 8, 14, Ni ; 17, 17, 14, Zn ; 4, 2, $4{\mu}g/g$, respectively. Metal concentrations in coals in Taebaek area by sieve sizes(-100/+200 mesh, -200/+325 mesh, -325 mesh) were as follows: Cu ; 30, 32, 26, Fe ; 1,741, 1,822, 1,773, Pb ; 8, 9, 7, Ni ; 13, 13, 13, Zn ; 8, 5, $4{\mu}g/g$, respectively. There were not significant differences of Cu, Fe, Ni, Pb, and Zn concentrations of coals statistically in Gangneung and Taebaek area by sieve size. 2. Metal concentrations of coals in Gangneung and Taeback area were as follows : Cu ; 19, 30, Fe ; 1,514, 1,778, Pb ; 9, 8, Ni ; 16, 13, Zn ; 3, $6{\mu}g/g$, respectively. Differences of copper and zinc concentrations of coal samples were significant between Gangneung and Taebaek area, but those of iron, nickel and lead concentrations were not significant. 3. Copper, iron, lead, nickel and zinc concentrations of coals and respirable coal dust were as follows : Cu ; 30, 6, Fe ; 1,779, 5,075, Pb ; 8, 7,814, Ni ; 13, 5,681, Zn ; 5, $134{\mu}g/g$, respectively. Differences of nickel, lead and zinc concentrations were significant between coals and respirable coal dust but those of copper and iron concentrations were not significant.

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New Malting Barley Variety "Sacheon# 6" (맥주맥 조숙 양질 다수성 신품종 "사천육호")

  • 박우형;정창해;최창휴;김병무
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.25 no.4
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    • pp.28-37
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    • 1980
  • New malting barley variety "Sacheon #6" is an early maturing, medium height, lodging resistance, high tillering, good quality and high yielding. This variety was developed from the cross Harupin-Nizo x Hokudai #2 made in 1970 at Sacheon Malting Barley Experiment Station, Doo San Farms Co., This variety was determined to recommend to the all malting barley production areas in southern part of Korea from 1979.from 1979.

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Chalcopyrite Disease in Sphalerite: A Case of the Soowang Ore Deposits in Muju, Republic of Korea (무주 수왕광산에서 산출되는 섬아연석의 황동석 병변에 관한 연구)

  • Youn, Seok-Tai
    • Journal of the Korean earth science society
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    • v.29 no.7
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    • pp.551-558
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    • 2008
  • The Soowang deposits occur in the quartz veins that were filled fissures in the middle Cretaceous porphyritic granite and/or the Precambrian Sobaegsan gneiss complex. Paragenetic studies suggest that the vein filling can be divided into four identifiable stages. Sphalerites were deposited by the cooling fluids at stages I, II, and III. The results of microscopic observation and EPMA analysis suggest that the chalcopyrite dots and disease in sphalerite are replacement products by later hydrothermal solution at the early stage III. The inferred processes of chalcopyrite disease are as follows: (1) Fe enrichment to the margins and along the cracks of the Fe-poor sphalerite by Fe-rich solution, (2) Formation of chalcopyrite dots in the Fe-enriched sphalerite formed at the stage II, and Fe reduction of sphalerite near the chalcopyrite dots by Cu-bearing solution, (3) Formation of "chalcopyrite disease" penetrating the compositional zoning of sphalerite at the early stage III.

A Design of Data Model for Electronic Tag Information Processing (전자태그 정보 처리를 위한 데이터 모델 설계)

  • Chang, Jung-Soo;Song, Jong-Chul;Ko, Gwang-San;Jung, Hoe-Kyung
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • v.9 no.1
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    • pp.763-766
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    • 2005
  • Ubiquitous Computing owes Internet and development of computer network and appeared. RFID (Radio frequency Identification) technology is noted by point technology to realize this. However, PML that present in Auto-lD Center is defined point part to describe information of object, and necessary part is to use defining extension separately in actuality application. So that can define object type that can be used for electron tag data processing in RFID application service because do fetters to Auto-lD Center's PML Core in this treatise hereupon and apply in physical distribution circulation service field, designed object information data model.

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An Overview of Geoenvironmental Implications of Mineral Deposits in Korea (한반도 광상 성인유형에 따른 환경 특성)

  • 최선규;박상준;이평구;김창성
    • Economic and Environmental Geology
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    • v.37 no.1
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    • pp.1-19
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    • 2004
  • Metallic deposits in Korea have a variety of genetic types such as hydrothermal veins, skarns, hydrothermal replacement and alaskite deposits and so on. Geological, mineralogical and geochemical features including host rock, wall-rock alteration, ore and gangue mineralogy, mineral texture and secondary mineralogy related to weathering process control the environmental signatures of mining areas. The environmental signatures of metallic deposits closed from early 1970s to late 1990s in Korea show complicate geochemistry and mineralogy due to step weathering of primary and secondary minerals such as oxidation-precipitation-remobilization. The potentiality of low pH and high heavy metal Concentration s from acid mine drainage is great in base-metal deposits associated with polymetallic mineralization, breccia-pipe type and Cretaceous hydrothermal Au veins with the amount of pyrite whereas skam, hydrothermal replacement, hydrothermal Cu and Au-Ag vein deposits are in low contamination possibility. The geoenvironmental models reflecting the various geologic features closely relate to disuibution of sulfides and carbonates and their ratios and finally effect on characteristics of environmental signatures such as heavy metal species and their concentrations in acid mine drainage.

Studies on the Effects of Several Amendments on the Uptake of Cd, Cu and Zn by Rice Plant (수도(水稻)의 중금속(重金屬) 흡수(吸收) 경감(經感)에 대(對)한 몇가지 개량제(改良劑)의 효과(效果))

  • Kim, Bok-Jin
    • Korean Journal of Environmental Agriculture
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    • v.6 no.1
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    • pp.25-30
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    • 1987
  • This study was conducted to find out the effect of several improvers such as triple super phosphate, slaked lime, wollastonite and gypsum for reducing Cd content in brown rice. Several improvers were applied to two different types of soils which are contaminated with copper-zinc mine wasted and sludge.(Soil I contained Cd : 7.88, Cu : 57.9, Zn : 175.0 ppm, Soil II contained Cd : 3.95, Cu : 30.2, Zn :124.0 ppm) In general, effects of improvers on reducing content of Cd, Cu and Zn in brown rice were greater in soil I than soil II. In soil I, the Cd content of brown rice was reduced to 0.4ppm below by application of triple superphosphate, fused phosphate, slaked lime and gypsum, 98, 225, 190 and 276Kg/10a, respectively. Triple superphosphate was more effective than fused phosphate in reducing uptake of Cd, Cu and Zn by applying them as an equal amount of phosphorous, also to equal alkalinity, slaked lime had the highest effect. Negatively linear effect was found between soil pH and Cd and Zn content in brown rice. As to above results, it was no doubt that triple superphosphate, fused phosphate and slaked lime would be applied to reduced heavy metals in brown rice. The slaked lime, triple super phosphate and fused phosphate were available to reduce uptake of Cd, Cu and Zn by rice plant grown in the soil contaminated with mine waste and sludge.

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