• 한국지하수토양환경학회지:지하수토양환경
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• 제7권2호
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• pp.45-52
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• 2002

문경지역 온천은 칼슘-중탄산 온천으로 원수의 온도는 약 $28.5^{\circ}C$이다 원수는 EC(1,857 $\mu\textrm{s}$/cm), $HCO_3$ (1,250 mg/l), $SO_4$(147.60 mg/l), Mg(43.05 mg/l) . 그리고 Ca(279.43 mg/l)로 상당히 높은 값을 나타낸다. 원수에는 소량의 침전물이 형성되지만 보일러로 가열할 경우 많은 양의 침전물이 형성된다. 원수에서 침전되는 광물은 대부분 방해석이지만 보일러실에는 아라고나이트와 방해석이 동시에 정출된다. 온천수 내의 화학종은 $CO_3$는 대부분 $HCO_3^{-}$ 이지만 상당 부분이 $H_2$$CO_3$로, $SO_4$는 $SO_4^{2-}$ , Mg는 $Mg^{2+}$ Ca는$ Ca^{2+}$ 로 존재한다. 전체적으로 볼 때 대부분의 성분에서 $CO_3$를 포함한 화학종이 존재하는 것을 볼 수 있다. 포화지수를 근거로 침전 가능한 광물은 다이아스포어, 보에마이트, 깁사이트, 아라고나이트, 방해석, 능철석 등이지만 X-선회절 분석결과 침전물은 아라고나이트, 방해석, 철수산화물로 구성되어 있다.

• 자원리싸이클링
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• 제3권3호
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• pp.32-49
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• 1994

포항제철소에서 발생되는 석회석슬러지의 기본탄산계 특성중의 일부분인 수화반응 연구를 수행하여 다음과 같은 결과를 얻었다. 1. 석회석슬러지는 광물조성상 calcite이며 고품위(CaO 51%) 미분말(15~22$\mu\textrm{m}$) 석회석으로 보통탄산칼슘 영역 (-3mm + 325mesh)에 속하는 것으로 분류되었다. 2. 석회석슬러지는 수세슬러지와 소성로 습식집진 dust의 혼합슬러지이며 약 8:2의 비율로 구성되어 있다. 수차례 시료채취한 소성로 습식집진 dust는 전형적인 calciteduTdmsk 실조업에서는 일부 열분해 시작한 quick lime과 다시 집진수와 수화된 slaked lime의 혼재가 예상되므로 두 공정 슬러지의 분리로 석회석슬러지의 품위를 향상시킬 수 있다. 3. 석회석슬러지를 소성, 수화하여 제조된 slaked lime의 각종 수화반응기 종류별에 변화에 대해 검토하였다. 일반적인 기계적인 교반기인 magnetic stirrer의 shaking incubator, ultrasonic vibration reactor을 비교 검토한 결과 ultrasonic vibration reactor에서 격렬하지 않은 수화반응과 타반응기 보다 미세한 분체생성 및 균일한 입도분포의 특징을 갖고 있었다. 4. Ultrasonic vibration reactor에서 미분말의 slaked limetod성에 최적인 광액 농도는 10wt%이하였으며, 수화완료 시간도 5~10분으로 타반응기 보다 짧았다. 5. 석회석슬러지는 천연산 석회석을 원료로 한 경우 10~20$\mu\textrm{m}$의 불균질 slaked lime 분체를 생성에 반해 석회석슬러지는 균일한 1~5$\mu\textrm{m}$ 분체를 생성하였다.

• 대한한의학방제학회지
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• 제11권2호
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• pp.61-82
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• 2003

Objectives: This study has been done to make sure the Gypsum's standardization in medical use. Gypsum has a quality for removing pathogenic heat from the stomach meridian function and headache. Methods: I studied the herbalogical Gypsum and compared its' compositions and character before and after high temperature burning. Results: Gypsum and Lishi(理石) are the sulfate which is made of $CaSO_4{\cdot}2H_2O$, Feldspar is a Calcite, Hanshuishi(寒水石) and Ningshuishi(凝水石) are not a Gypsum but a Magnesium Sulfate($MgSO_4$) and Kalium Sulfate($K_2SO_4$). Conclusion: Real Gypsum is supposed to be Yiong cheng${\setminus}$(應城) Gypsum. Chemical edible Gypsum isn't appropriated to be used in medicine.

• 자원환경지질
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• 제16권3호
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• pp.135-147
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• 1983

The copper deposits in Goseong district, Gyeongnam area are fissure filled copper veins emplaced on Cretaceous Goseong formation and andesitic rocks. Occurrence of ore veins and mineral paragenesis suggest a division of the hydrothermal mineralization into three stages: stage 1, deposition of arsenopyrite, pyrite, quartz, chlorite and epidote; stageII, deposition of pyrite, chalcopyrite, galena, sphalerite, electrum, pyrargyrite, tetrahedrite, silver sulfosalt minerals, quartz, chlorite, sericite and miner amount of calcite; stage III, formation of barren calcite veins. Filling temperature of fluid inclusions in quartz of stage II, range from 260 to 360 C and salinities from 6.2 to 13.6 weight percent NaCi equivalent.

• Geomechanics and Engineering
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• 제17권1호
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• pp.57-67
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• 2019

Water-induced strength reduction is one of the most critical causes for rock deformation and failure. Understanding the effects of water on the strength, toughness and deformability of rocks are of a great importance in rock fracture mechanics and design of structures in rock. However, only a few studies have been conducted to understand the effects of water on fracture properties such as fracture toughness, crack propagation velocity, consumed energy, and microstructural damage. Thus, in this study, we focused on the understanding of how microscale damages induced by water saturation affect mesoscale mechanical and fracture properties compared with oven dried specimens along three notch orientations-divider, arrester, and short transverse. The mechanical properties of calcite-cemented sandstone were examined using standard uniaxial compressive strength (UCS) and Brazilian tensile strength (BTS) tests. In addition, fracture properties such as fracture toughness, consumed energy and crack propagation velocity were examined with cracked chevron notched Brazilian disk (CCNBD) tests. Digital Image Correlation (DIC), a non-contact optical measurement technique, was used for both strain and crack propagation velocity measurements along the bedding plane orientations. Finally, environmental scanning electron microscope (ESEM) was employed to investigate the microstructural damages produced in calcite-cemented sandstone specimens before and after CCNBD tests. As results, both mechanical and fracture properties reduced significantly when specimens were saturated. The effects of water on fracture properties (fracture toughness and consumed energy) were predominant in divider specimens when compared with arrester and short transverse specimens. Whereas crack propagation velocity was faster in short transverse and slower in arrester, and intermediate in divider specimens. Based on ESEM data, water in the calcite-cemented sandstone induced microstructural damages (microcracks and voids) and increased the strength disparity between cement/matrix and rock forming mineral grains, which in turn reduced the crack propagation resistance of the rock, leading to lower both consumed energy and fracture toughness ($K_{IC}$).

• 보존과학회지
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• 제32권3호
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• pp.403-416
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• 2016

본 연구는 현재 단청시공에 실제 사용되고 있는 국산 천연안료 제품 총 22종을 대상으로 리트벨트법을 활용한 정량 X-선 회절분석을 실시하여 구성성분의 조성과 함량 특성을 밝히고자 하였다. 분석결과, 주보사와 황, 석록, 석청, 호분 등의 제품들은 각각 거의 순수한 진사, 웅황, 공작석, 남동석 및 방해석 또는 아라고나이트로 구성된 것으로 판단된다. 반면, 석간주와 황토, 뇌록, 라피스라즐리, 백토, 꼬막호분 등의 제품들은 각각 적철석, 침철석, 뇌록석, 라주라이트, 고령석 및 포틀랜드석 등이 주구성광물이며, 그 외 석영, 장석, 견운모, 질석 등 일반적인 토양에 풍부한 광물과 방해석, 석고 및 경석고 등과 같이 산업계에서 충진제로 활용되는 광물들이 각 제품에 다양한 비율로 함유되어 있는 것으로 나타났다. 이와 같이 정량 X-선 회절분석을 통하여 화학조성분석이나 현미경관찰만으로는 획득하기 쉽지 않은 보다 구체적인 안료 제품들의 광물조성 및 그 함량 비에 대한 정보를 획득할 수 있었으며, 추후 이를 천연안료제품의 품질기준 설정에 활용하거나 대체원료수급 및 품질향상을 통한 보존과학연구 등에 다양한 방법으로 적용이 가능할 것으로 사료된다.

• 자원환경지질
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• 제7권2호
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• pp.45-62
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• 1974

Scheelite deposits in Sangdong mine are divided into three parallel vein groups, namely "Hanging-wall vein" which is located in the lowest parts of Pungchon Limestone, "Main vein" the most productive vein replaced a intercalated limestone bed in Myobong slate, "Foot-wall veins" a group of several thin veins parallel to main vein in Myobong slate. Besides the above, there are many productive quartz veins imbedded in the above veins and Myobong slate. Molybdenite and wolframite are barren in the former three veins group but associates only in quartz veins. Both main vein and foot-wall veins show regular zonal distribution, quartz rich zone in the center, hornblende rich zone surrounding the quartz rich zone and diopside rich zone in the further outside to the marginal parts of the vein. According to the distribution of three main minerals, quartz, hornblende and diopside the main vein can be divided into three zones which are in turn grouped into 7 subzones by distinct mineral paragenesis. They are summerized as follows: A. Diopside rich zone: 1. garnet-diopside.fl.uorite subzone 2. diopside-zoisite-quartz subzone 3. diopside-plagioclase subzone B. Hornblende rich zone: 4. hornblende-diopside-quartz subzone 5. hornblende-quartz-chlorite subzone 6. hornblende-plagioclase-quartz.sphene subzone C. Quartz rich zone: 7. quartz-mica-chlorite subzone The foot-wall veins can similarly be divided by mineral paragenesis into 3 zones, 6 subzones as follows: A. diopside rich zone: 1. garnet-diopside-quartz.fl.uorite subzone 2. garnet-diopside-wollastonite subzone B. Hornblende rich zone: 3. quartz-hornblende-chlorite subzone 4. hornblende-plagioclase-quartz subzone 5. hornblende-diopside-quartz subzone C. Quartz rich zone: 6. quartz-mica subzone The hanging-wall vein is generally grouped into 9 subzones by the mineral paragenesis which show random distribution. They are as follows: 1. diopside-garnet-fluorite subzone 2. diopside-zoisite-quartz subzone 3. diopside-hornblende-quartz-fluorite subzone 4. wollastonite-garnet-diopside subzone 5. hornblende-chlorite-quartz subzone 6. quartz-plagioclase-hornblende-sphene subzone 7. quartz-biotite subzone 8. quartz-calcite subzone 9. calcite-altered minerals subzone Among many composing minerals, garnet specially shows characteristic distribution and optical properties. Anisotropic and euhedral grossularite is generally distributed in the hanging wall vein and lower parts of the main vein, whereas isotropic and anhedral andradite in the upper parts of the main vein. Plagioclase (anorthite) and sphene are distributed ony near the foot-wall side of the aboveveins. wollastonite is a characteristic mineral in upper parts of the hang-wall vein. Molybdenite is distributed in the upper parts of quartz veins and wolframite in lower parts of quartz veins.

• 한국세라믹학회지
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• 제33권11호
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• pp.1276-1284
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• 1996

Ultrafine calcim carbonate powders with the size of 0.05~0.1 ${\mu}{\textrm}{m}$ and the calcite phase were prepared by the nozzle spouting method which was conducted by spouting calcium hydroxide slurry in reactor filled with CO2 gas. Well dispersed ultra-fine particles were synthesized in condition of high Ca(OH)2 concentration of the slurry ( 0.5wt%) synthesized calcium carbonate powder was shown the large particle size with agglo-meration.

• 자원환경지질
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• 제18권1호
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• pp.11-22
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• 1985

The Daehwa and Donsan tungsten-molybdenum deposits are composed of numerous fissure-filling veins developed in Precambrian gneiss and Cretaceous granite and quartz porphyry. K-Ar age of biotite in granite and that of muscovite in ore veins are $105{\pm}5\;Ma$ and 88.2~88.6 Ma respectively. Occurrence of ore deposits shows that relevant igneous rock is possibly quartz porphyry rather than above mentioned granite in temporal view point. Vein structure and mineralogy suggest that ore veins were formed by continuous vein filling, not by repeated mineralization. Three distinct depositional stages with decreasing age can be devided on the basis of mineral paragenesis and fluid inclusion studies: Stage I, deposition of oxides and silicates; stage II, deposition of base-metal sulfides and sulfosalts with carbonates; stage III, deposition of barren calcite and fluorite. Tungsten, molybdenum and tin mineralization occurred in stage I.

• 자원환경지질
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• 제23권4호
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• pp.411-424
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• 1990

Mechanical, physical and petrographic properties of seventeen marble specimens collected from ten marble mines in Korea were investigated. Studied marbles were mainly composed of calcite, dolomite, and various amounts of serpentine, tremolite, olivine, quartz and opaque minerals. Complete and sutured textures were dominant. Compressive strength measured normal to the bedding plane is larger almost two times than that measured parallel to the bedding plane. From the results of Shore hardness test on marbles, water content was an important factor to decrease Shore hardness values. Engineering geological properties, especially, compressive strength, Young's modulus, wear resistance and water absorption could be controlled by the presence of quartz, and the type of marble texture. Water absorption-porosity, compressive strength-Young's modulus, and impact strength index-Los Angeles abrasion couples show good correlation. According to the comparative utility as commercial stone, it could be concluded that marbles from the Banglim mine, Songbo mine, Kwangdeok mine and Bongjeong mine were superior to that of other studied marbles.