• Title/Summary/Keyword: 지질자원기술

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Extraction kaolin minesin Hadong Area using ASTER image (ASTER 영상 자료를 이용한 하동지역 고령토 광산 분포 추출)

  • LEE, Hong-Jin;KIM, In-Joon;PARK, Maeng-Eon;CHI, Kwang-Hoon;BAEK, Seung-Gyun;KO, Kyoungtae
    • Journal of The Geomorphological Association of Korea
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    • v.21 no.4
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    • pp.121-131
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    • 2014
  • This study analyzed the spectral reflectance characteristics of kaolinite and ASTER(Advanced Spaceborne Thermal Emission and Reflectance Radiometer) image to extract the distribution of kaolin mines in Hadong area, Gyeongsangnam-do. The band ratio model was applied to extract kaolinite using difference of wavelength absorption band distinct feature of minerals from ASTER image which is the major mineral of kaolin mines. According to the spectral reflectance curve of kaolinite, it showed the absorption features around 0.96 and $2.18{\mu}m$ by Al-OH. Also, it affected 1.24 and $1.38{\sim}1.41{\mu}m$ by OH. Applying for new band ratio model from the spectral features of kaolinite to ASTER image, it is possible to make the distribution map of mining traces including present- developing kaolin mines.

Recycling of Hardmetal Tool through Alkali Leaching Process and Fabrication Process of Nano-sized Tungsten Carbide Powder using Self-propagation High-temperature Synthesis (알칼리 침출법을 통한 초경 공구의 재활용 및 자전연소합성법을 통해 제조된 나노급 탄화텅스텐 제조공정 연구)

  • Kang, Hee-Nam;Jeong, Dong Il;Kim, Young Il;Kim, In Yeong;Park, Sang Cheol;Nam, Cheol Woo;Seo, Seok-Jun;Lee, Jin Yeong;Lee, Bin
    • Journal of Powder Materials
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    • v.29 no.1
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    • pp.47-55
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    • 2022
  • Tungsten carbide is widely used in carbide tools. However, its production process generates a significant number of end-of-life products and by-products. Therefore, it is necessary to develop efficient recycling methods and investigate the remanufacturing of tungsten carbide using recycled materials. Herein, we have recovered 99.9% of the tungsten in cemented carbide hard scrap as tungsten oxide via an alkali leaching process. Subsequently, using the recovered tungsten oxide as a starting material, tungsten carbide has been produced by employing a self-propagating high-temperature synthesis (SHS) method. SHS is advantageous as it reduces the reaction time and is energy-efficient. Tungsten carbide with a carbon content of 6.18 wt % and a particle size of 116 nm has been successfully synthesized by optimizing the SHS process parameters, pulverization, and mixing. In this study, a series of processes for the high-efficiency recycling and quality improvement of tungsten-based materials have been developed.

Thermodynamic Evaluation of Sulfate-Roasting Process for the Vanadium Extraction from Korean VTM Ore (국내부존 VTM으로부터 바나듐 회수를 위한 황화배소 공정의 열역학적 평가)

  • Kim, Youngjae;Choi, Kyungsob;Park, Hyunsik;Chung, Kyeong Woo
    • Resources Recycling
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    • v.31 no.2
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    • pp.49-55
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    • 2022
  • In the present study, the thermodynamic evaluation of the sulfate-roasting process was conducted to extract vanadium from the Korean vanadium titano-magnetite ore. The leaching efficiency of vanadium and other impurities was analyzed for varying roasting temperatures and addition of Na2SO4. In the case of sulfate roasting, the roasting temperature was 200 ℃ higher than that previously observed Na2CO3 roasting. However, the higher leaching efficiency of vanadium and lower leaching efficiency of other impurities, such as aluminum and silicon, were observed. The high selectivity for the extraction of vanadium in sulfate roasting would result from the reaction mechanism between SO2 gas and vanadium concentrate.

Hydrogeochemical Characteristics and Microbial Community Structures of Freshwater in Ulleung Island (울릉도 담수의 수리지화학적 특성 및 미생물 군집 구조)

  • Dong-Hun Kim;Byong Wook Cho;Byeong Dae Lee;Jung-Yun Lee;Yong Hwa Oh
    • Journal of Soil and Groundwater Environment
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    • v.29 no.3
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    • pp.1-13
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    • 2024
  • This study investigated the hydrogeochemical and microbiological characteristics of freshwater on Ulleung Island, a volcanic island in the Ulleung Basin on the East Coast of Korea. The shallow groundwater (CSW, NRGW) and the surface water (SISW) samples are classified as Na-HCO3 type, reflecting an alkaline rock type and an oxidizing environment due to the influence of a highly permeable pyroclastic rock layer. In contrast, the deep groundwater sample (DMW) is classified as Ca-HCO3 type, suggesting the influence of deep-sourced carbon dioxide and reducing conditions. Microbial communities in the water samples are generally dominated by Proteobacteria, with the relative abundance of major genera varying depending on water quality and environmental conditions. Network analysis reveals the ecological characteristics of microbial communities adapted to specific environments. The presence of pathogenic genera in the shallow groundwater suggests potential groundwater contamination, necessitating appropriate management to ensure its use as drinking water or domestic water. The findings of this study provide valuable insights into the ecological characteristics of Ulleung Island's groundwater resources and can inform future groundwater management strategies.

(Technical note) Pollen and dinoflagellate cyst assemblages from the surface sediments of the lower reach of the Jujin Stream ((기술노트) 주진천 하류역의 퇴적물에서 산출되는 화분과 와편모조류 군집 특성)

  • Sangheon Yi;Jin-Young Lee;Min Han;Jaesoo Lim;Chang-Pyo Jun
    • The Korean Journal of Quaternary Research
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    • v.33 no.1_2
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    • pp.59-68
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    • 2021
  • The maximum upper limit of seawater inflow can be recognized by the acid-resistant dinoflagellate cysts and salt-marsh pollen encountered from surface samples in the lower reach of Jujin Stream facing Gomso Bay. Based on their relative yield ratio, the downstream area of Jujin Stream could be further subdivided into coastal marine, brackish-upper limit brackish, and freshwater environments. The abundance of dinoflagellate cysts from JJR-41 to JJR-36 sites reflects that this area is a coastal marine. In the section between JJR-35 and JJR-5 sites, dinoflagellate cysts associated with pollen derived from riparian or salt-marsh (e.g., reeds and sedges) appear to reflect the brackish environments. It may be indicated that dinoflagellate cysts appear up to the JJR-4 site, which is the maximum upper limit where seawater flows up to this point at high tide. This analysis is relatively well corresponding to the hypothetical inundation map showing the maximum flooding area where seawater can flow at high tide.

Separation of Uranium(VI) and Vanadium(V) from Sulfuric Acid Media by Amine Based Extractants through Liquid-liquid Extraction Technique (황산 용액으로부터 아민계 추출제의 액-액 추출법에 의한 우라늄(VI)과 바나듐(V)의 분리)

  • Jeon, Jong-Hyuk;Lee, Jin-Young;Kim, Joon Soo;Yoon, Ho-Sung;Jyothi, Rajesh Kumar
    • Resources Recycling
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    • v.30 no.4
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    • pp.64-74
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    • 2021
  • The importance of uranium metal is growing day by day in light of its increasing global demand for fulfilling societal needs through atomic power programs. Considering the high demand for uranium, it is necessary to find innovative hydrometallurgical techniques to separate uranium from other associated elements, especially vanadium. This study deals with the separation of uranium(VI) and vanadium(V) from sulfuric acid solutions using commercial amine-based extractants diluted in kerosene. The concentrations of the sulfuric acid solutions ranged from 0.005 to 5.0 mol/L. The effect of extractant concentration ranging from 0.005 to 0.2 mol/L was studied. The temperature was maintained at 25℃ and the experiment was performed for 30 min at an aqueous: organic phase ratio of 1 (A:O = 1:1). The calculated separation factors (SFs) are presented and comparisons are made among all the experiments.

Construction of Korea Remote Sensing Center's Homepage and it's Operation (공공원격탐사센터 홈페이지 구축 및 운용)

  • 임효숙;김용승;김윤수;김인수;서두천;이광재;이선구
    • Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
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    • 2003.04a
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    • pp.15-20
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    • 2003
  • 한국항공우주연구원은 공공기술연구회 산하 한국지질자원연구원, 한국해양연구원, 한국건설기술연구원과 협력하여 2002년 4월 17일에 본격적인 원격탐사 연구 및 공공지원 업무의 주축을 담당하게 될 공공원격탐사센터를 설립하였다. 별도의 독립조직이 아니라 원격탐사위성인 아리랑위성을 개발, 운영하고 있는 한국항공우주연구원을 중심으로, 한국해양연구원, 한국지질자원연구원, 한국건설기술연구원등 관련기관이 해양분야, 지상분야, 건설분야 등 각 전문분야 별로 협동연구 체계를 구축, 실질적인 국가원격탐사센터 역할을 수행할 것이다. 이와 같이 설립된 공공원격탐사센터에 대한 홍보, 위성자료의 공공활용 지원 및 원격탐사 Tutorial 등을 사용자들이 쉽게 접속하여 이용할 수 있도록 공공원격탐사센터 홈페이지를 구축하여 Open 하게 되었다. 공공원격탐사센터 본부인 한국항공우주연구원을 비롯하여 전문센터별로도 홈페이지를 구축하여 서로 연결되도록 하였다. 2003년도에는 이와 같이 open 된 홈페이지에 위성자료 통합 DB를 구축하여 서비스할 예정이다.

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Mineralogical and Geochemical Studies on the Daum Vent Field, Central Indian Ridge (인도양 중앙해령 Daum 열수분출대의 광물·지구화학적 연구)

  • Ryoung Gyun Kim;Sun Ki Choi;Jonguk Kim;Sang Joon Pak;Wonnyon Kim
    • Economic and Environmental Geology
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    • v.56 no.6
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    • pp.765-779
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    • 2023
  • The Daum Vent Field (DVF) was newly discovered in the Central Indian Ridge during the hydrothermal expedition by the Korea Institute of Ocean Science & Technology (KIOST) in 2021. In this paper, we describe the detailed mineralogy and geochemistry of hydrothermal chimney and mound to understand the nature of hydrothermal mineralization in the DVF. The mineral assemblages (pyrite±sphalerite±chalcopyrite) of dominant sulfides, FeS contents (mostly <20 mole %) of sphalerite, and (Cu+Zn)/Fe values (0.001-0.22) of bulk compositions indicate that the DVF has an strong affinity with basaltic-hosted seafloor massive sulfide (SMS) deposit along the oceanic ridge. Combined with the predominance of colloform and/or dendritic-textured pyrite and relatively Fe-poor sphalerite in chimneys, the fluid-temperature dependency of trace element systematics (Co, Mn, and Tl) between chimney and mound indicates that the formation of mound was controlled by relatively reducing and high-temperature fluids compared to chimney. The δ34S values (+8.31 to +10.52‰) of pyrite reflect that sulfur and metals were mainly leached from the associated basement rocks (50.6-61.3%) with a contribution from reduced seawater sulfur (38.7-49.4%). This suggests that the fluid-rock interaction, with little effect of magmatic volatile influx, is an important metal source for the sulfide mineralization in the DVF.

Construction of Hydrogeological Model for KURT Site Based on Geological Model (KURT 연구지역에서 지질모델을 이용한 수리지질모델의 구축)

  • Park, Kyung-Woo;Ko, Nak-Yeol;Ji, Sung-Hoon
    • Economic and Environmental Geology
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    • v.51 no.2
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    • pp.121-130
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    • 2018
  • The KURT (KAERI Underground Research Tunnel) is a research tunnel which is located in KAERI (Korea Atomic Energy Research Institute) site. At KURT, researches on engineering and natural barrier system, which are the most important components for geological disposal system for high level radioactive waste, have been conducted. In this study, we synthesized the site characteristics obtained by various types of site investigation to introduce the geological model for KURT site, and induced the 3-D hydrogeological model for KURT site from the geological model. From the geological investigation at the surface and boreholes, four geological elements such as subsurface weathered zone, upper fractured rock, lower fractured rock and fracture zones were determined for the geological model. In addition, the geometries of these geological elements were also analyzed for the geological model to be three-dimensional. The results from 3-D geological model were used to construct the hydro-geological model for KURT site, which is one of the input data for groundwater flow modeling and safety assessment.