• The Journal of Engineering Geology
• /
• v.18 no.4
• /
• pp.577-586
• /
• 2008

The formation of acid mine drainage is closely related to water chemistry and ochreous sprecipitates formed at the bottom of creeks because it is initially derived from the possible water-rock interaction in abandoned waste metals at the mine. According to analyses on water, precipitates, and alteration characters of ore metals in Dalseone mine, whitish precipitates formed at pHs above 5 while schwertmannite formed at pH $3{\sim}4$. Water chemistry vary with seasons. The water chemistry of the treatment site measured ir Octoter 2002 is characterized by lower pH, and higher Al, Zn, Cu contents relative to those in March, 2003. In the latter case, As and Cl contents are very high. $^{27}Al$ MAS NMR data show the presence of predominant octahedral Al in whitish precipitates. Metal ore minerals dissolve at margins, cleavage, or comer of crystals where reactive sites are potential. Pyrite dissolves, forming etch pits or smooth faces on the edge.

• The Journal of Engineering Geology
• /
• v.17 no.2 s.52
• /
• pp.187-196
• /
• 2007

The Dalseong acid mine drainage were studied focused on the characters of schwertmannite that controls geochemistry of the stream. Besides chemical analysis of stream water, particle size analysis, XRD SEM and TEM were performed on precipitates of streams and on wasted metalliferous ores. The AMD discharged from the abandoned mine reveals a decrease of pH and EC downward stream. Euhedral sulfur occurs as equigranular aggregates on the altered pyrite while fine acicula goethite coalesces to form cross, star, or starfish-like shapes. Water chemistry plotted on the Eh-pH diagram shows that schwertmannite and ferrihydrite are stable phases. Reddish brown precipitates consist of mostly schwertmannite with less goethite, whereas yellowish brown precipitates are composed of geothite with less schwertmannite. The particle size of precipitates ranges $d(0.1)\;0.861{\mu}m{\sim}3.769{\mu}m,\;d(0.5)\;3.984{\mu}m{\sim}15.255{\mu}m,\;and\;d(0.9)\;9.875{\mu}m{\sim}56.726{\mu}m$. Schwertmannite is characterized by equigranular spheric form. Pincushion or spicule with 100nm width and $200{\sim}300nm$length form on schwertmannite sphere with radial growth patterns. It is highly probable that reddish or yellowish brown precipitates formed in many AMDs may contain schwerhnannite. Because it can serve as sink for removing heavy elements by adsorption in AMD system, there is a need to correctly identify schwertmannite in precipitates and to characterize its phase stability.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
• /
• 1997.05a
• /
• pp.17-20
• /
• 1997

이 연구에서는 국내에 산재되어 있는 금속광산들에 대한 토양환경오염을 조사하고 적절한 환경처리를 위한 기초자료를 제공하기 위하여 대표적인 연-아연광산, 동광산 및 금-은광산을 대상으로 As. Cd, Cu, Pb, Zn 등의 오염규모와 분산정도를 규명하고자 하였다. 연구대상지역으로 삼보 연-아연강산, 달성 동-텅스텐광산 그리고 구봉, 삼광, 금왕 금-은광산을 선정하여 이들 광산 주변에서 토양을 채취하여 화학분석을 실시하였다. 그리고 연속추출법을 이용하여 토양중에 존재하는 중금속의 존재형태를 규명하였으며 화학분해방법에 따른 중금속의 추출정도를 고찰하기 위하여 강산을 이용한 분해방법과 토양환경보전법에 제시된 방법을 비교하였다. 화학분석 결과, 삼보광산 주변의 상부토양 (0-15cm 심도)에서는 평균 11.8 $\mu\textrm{g}$/g Cd, 208 $\mu\textrm{g}$/g Cu, 2,700 $\mu\textrm{g}$/g Pb, 8,300 $\mu\textrm{g}$/g Zn이 검출되었으며 일부 농경지에서는 토양환경보전법의 우려기준을 초과하는 중금속이 검출되어 광산활동에 의한 토양오염이 심각함이 조사되었다. 달성광산 주변 토양에서도 다량의 중금속이 검출되었으며 (평균 4.4 $\mu\textrm{g}$/g Cd, 1,950 $\mu\textrm{g}$/g Cu, 1,030 $\mu\textrm{g}$/g Pb, 419 $\mu\textrm{g}$/g Zn) 특히 As (평균 2,500 $\mu\textrm{g}$/g)의 오염이 심각하였다. 그리고 대표적인 금은광산인 구봉, 삼광 및 금왕광산에서는 광미와 선광장 주변에서 다량의 중금속과 As가 검출되었다. 이 연구 결과, 이들 점오염원에 대한 오염정도가 심각하므로 이를 적절하게 처리할 수 있는 오염복구사업이 실시되어야할 것으로 판단된다.

• Photonics industry news
• /
• s.33
• /
• pp.6-7
• /
• 2006

한국광산업진흥회에서는 광산업 육성 및 조기 발전을 통한 세계 5위권 광 선진국 목표 달성 비전을 제시하고, 광산업 분야별 현황과 향후 전망을 보여줌으로써 광산업체ㆍ정부기관ㆍ유관기관ㆍ관련 연구소등에서 정책 및 연구, 경영활동에 필요한 기초자료로의 활용에 도움이 될 수 있도록, 광산업 육성사업 1단계(2000년~2003년) 사업 추진 실적 및 2단계 (2004년~2008년) 육성 계획에 대한 내용을 집대성한 ‘광산업백서’를 발간하였다.

• Photonics industry news
• /
• s.62
• /
• pp.20-23
• /
• 2011

한국광산업진흥회 조규종 상근부회장은 "지난 10년동안 광주광산업의 발전이 향후 10년을 내다보는 국가미래 성장동력산업으로 자리매김해 나갈수 있도록 종합적인 광산업육성 로드맵 수립과 광산업 공동브랜드(LUXKO)인증제품을 중심으로 한 광통신 및 LED분야 컨소시엄 구축으로 해외 대규모 프로젝트수주지원을 통해, 광주광산업 2011년도 목표를 달성하는데 최선을 다해 지원해 나갈 계획"이라며 "대내외적으로 도전에 직면해 있는 2011년 광주광산업의 과제를 해결해 나가는데 광산업관련 산 학 연 관의 결집된 동력을 이끌어내는 구심점으로서 한국광산업진흥회가 앞장서 나갈 계획"이라고 밝혔다.

• Journal of the Mineralogical Society of Korea
• /
• v.30 no.4
• /
• pp.195-204
• /
• 2017

For evaluation of adsorption characteristics of heavy metals, precipitates were collected from stream bottom in the Dalseong mine. The removal of some heavy metals such as As, Cu, and Cd from aqueous solution is studied using a precipitates taken from acid mine drainage. The yellowish brown (Munsell color 8.75YR 5/10) and dark brown (Munsell color 2.5YR 3/8) precipitates that collected from the study area consist mainly of schwertmannite and goethite, respectively. The percentage removal or adsorption capacity of metals depends on the initial concentration and characteristics of adsorbent. Removal efficiency of the adsorbents shows the order for metal ions of As > Cu > Cd. The adsorption efficiency by absorbent of precipitates in low concentration metal aqueous solution were observed 67.00-85.00% for As, 26.24-29.08% for Cd, and 7.67-12.82% for Cu. As the initial concentration of metal ions was increased from 1 to 10 mg/L, adsorption amount of adsorbent increased from 0.29 to 1.29 mg/g of Cu of schwertmannite, and from 0.24 to 1.97 mg/g of goethite.

• Journal of Korea Soil Environment Society
• /
• v.3 no.2
• /
• pp.13-29
• /
• 1998

Recently, It is increasing popularity to research on the soil remediation in aspect of management by reason of the hazardous impact on the contaminated soil in Korea. It was investigated high levels of arsenic salts in soil near abandoned five mines(Darak, Daduk, Jingok, Dalsung, Ilkwang) located in Youngnam area. Arsenic, classified as group A(Human Carcinogens) from IRIS, have shown statistically significant increment in skin cancer with oral exposure. This paper was conducted to predict excess cancer risk value (to the skin cancer) based on multiple pathway such as soil ingestion, dermal uptake and food(plant) ingestion contaminated by arsenic, and also, to identify the remedial goal regarded in future land use. The mine having the highest arsenic level was Daduk(mean : 1950mg/kg) and the next rank was Jingok(1690mg/kg), Ilkwang(352.37mg/kg), Dalsung(86.08mg/kg), Darak(0.83mg/kg). The chronic daily intake to the multiple exposure were calculated using Monte-Carlo simulation regarded in future land use and used q: value was $1.5(mg/kg/day)^{-1}$ to the oral proposed by IRIS(1997). The computated excess cancer risk 95th value to all the mine regarding future land use as residential and rural area were more than $10^{-4}$. If the level of acceptable risk is aimed for 1$\times$$10^{-6}$, it could be used Darak as commercial and industrial area without soil remediation due to the lowest risk value(6$\times$$10^{-8}$ and 3$\times$$10^{-8}$). Computated remedial goal based on 1$\times$$10^{-6}$ of acceptable risk to the future land use as the residential, rural, commercial and industrial area were 0.02mg/kg, 0.003mg/kg, 97.31mg/kg and 194.62mg/kg, respectively.

• Journal of the Mineralogical Society of Korea
• /
• v.17 no.1
• /
• pp.37-47
• /
• 2004

Sulfates such as alunite and schwertmannite formed under oxidation condition play a important role in geochemical processes taken place at waste dumps and a creek from Dalseong mine, Daegu. Water chemistry shows pH decreases from upstream toward downstream creek, mainly due to formation of schwertmannite that is the most abundant phase along the creek. The removal of Al from the creek is preferentially attributed to formation of Al-bearing minerals and Al-sulphates. Among them, alunite is the most important Al-sink phase that occurs at higher pH than $pK_1$, Al hydrolysis constant. With high saturation index, alunite formed at the creek has a spherical form, commonly associated with schwertmannite. Secondary minerals formed on the surface of altered or weathered surfaces of heavy metals from the wasted dump that underwent severe oxidation, where alunite has characteristic habits which are spheric, radiating, and botrytis-like aggregates. Natroalunite occurs in association with alunite, or as mixtures of both of them. Because the pH decreases with distance due to formation of schwertmannite, although total contents of dissolved ions slowly lessen at least in the AMD, it is expected that the minerals precipitated at the creek can be exposed to subsequent dissolution, which may induce possible environmental problems.

• The Optical Journal
• /
• s.99
• /
• pp.57-63
• /
• 2005

1980년 일본광산업기술진흥협회(OITDA)가 설립된 이후 지속적인 성장을 거듭해 온 일본의 광산업은 설문조사가 시작된 이후 처음으로 전세계적인 IT 침체의 영향으로 인해 2001년 한해 마이너스 성장(-15.1%)을 기록했다. 그러나 광산업은 다른 어떤 산업분야보다 훨씬 빠른 속도로 회복하여 다음해인 2002년에는 2.7%의 플러스 성장을 기록했고 다음해인 2003년에는 성장 곡선을 그대로 유지해 전년도 성장 예측 치를 뛰어넘는 19.8%라는 기록적인 성장을 달성했다. 2004년에는 8조 엔의 매출(전년도 대비 13.8% 성장)을 기록했고 2005년에는 9조엔(10.4%상향 조정)이상의 매출 목표를 세우고 있다. 이처럼 일본의 광산업은 계속해서 성장해 나갈 것이며 고부가가치 산업 중 하나로서 일본 경제 회복의 일익을 담당하고 있다.

• Photonics industry news
• /
• s.38
• /
• pp.20-21
• /
• 2007

국내 대표적인 통신회사를 중심으로 작년부터 투자를 확대하기 시작한 FTTH 구축공사는 올해 들어 그 규모가 점차 확대되고 있다. 링크옵틱스는 FTTH 구축공사에 필요한 필수장비 중의 하나인 광점퍼코드 연마기를 소형화하고 휴대가 간편한 현장용으로 출시하여 수요업체로부터 호평을 받고 있다. 개발한 제품은 KT, 하나로통신, LS전선 등 국내업체와 유럽 및 남미에 고정거래처를 확보하고 있으며, 올해는 더욱 연구 개발에 박차를 가하면서 해외수출에 전념해 30억원의 매출을 달성할 예정이다.