http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
백운석 광산 분진세척수의 탁도 개선과 산성광산배수 중화에 대한 적용성 평가
강중석,임길재,서의영,정영욱,강상수,김경만,오참뜻,지상우 한국자원공학회 2014 한국자원공학회지 Vol.51 No.3
The improvement of turbidity in a dolomite mine dust screen water by coagulation and precipitation and the feasibility of neutralizing acid mine drainage (AMD) using the dust were investigated. The simulated dust screen water was prepared using S dolomite mine dust for experiments. The water shows 1,558 NTU of turbidity and pH 8.51. The median diameter (D50) of dust was 16.4 ㎛ and the particle size distributes from 10 ㎛ to 30 ㎛. Regardless of the coagulants, 90% of turbidity was improved at pH 3 and 5. The inorganic coagulant, PAC, and the organic coagulant, Nalco 9601, show good improvement efficiencies of turbidity at pH 7 and 11, respectively. In the experiment to neutralize acid mine drainage, dolomite dust increased the AMD pH from 2.89 to 6.7 for 10 min, and removed 100% of the dissolved Fe and Al. 백운석 광산에서 발생되는 분진세척수에 대하여 응집침전에 의한 탁도제거 특성과 분진을 활용한 산성광산배수 중화처리 가능성을 평가하였다. 실험을 위해 S 백운석 광산의 분진을 이용해서 인공 분진 세척수를 제조하였다. 초기 탁도는 1,558 NTU 였으며, pH는 8.51이었다. 분진의 중수위 입도(D50)는 16.4 μm 였으며, 대부분이 10~30 μm의 입자크기를 갖고 있었다. 응집제와 관계없이 pH 3과 5에서는 90%이상의 탁도가 제거되었다. 무기 응집제인 PAC의 경우 pH 7에서, 유기응집제인 Nalco 9601의 경우 pH 11에서 탁도제거 효율이 좋았다. 산성광산배수에 대한 중화능력 실험 결과 백운석 분진은 10분경과 후 pH 2.89인 산성광산배수의 pH를 6.7 이상으로 상승시켰고, 용존되어 있던 Fe와 Al을 100% 제거하였다.
O 석회석 광산 세척수의 미세 석분 응집 및 석분 슬러지의 중화 특성 평가
강중석,정영욱,정소걸,서의영,임길재,지상우 한국자원공학회 2013 한국자원공학회지 Vol.50 No.2
The physical properties and coagulation of suspended solids in a settling pond designed to control flying rock dust during screening of limestone ores in O limestone mine were evaluated. The neutralization capacity of settled sludge was also studied. Turbidity at the inlet and outlet of the settling pond was measured as 2,264 and 1,228 NTU, respectively. The later was still considered to be a high level of turbidity just before recycling. The particle size (d(0.5)) of suspended solids in the settling pond ranged 5.1 to 10.1 μm. Jar tests showed improved coagulation of suspended solids at a pH 3 to 5 as concentration of coagulant, increased from 1 to 10 mg/L and as period of mixing increased. Neutralization evaluation results revealed that fine sludge <1 mm in size from the settling pond increased the pH of acid mine drainage to pH 6 and could remove dissolved Al and Fe within 10 minutes. O 석회석 광산에서 석분의 비산방지를 위해 운영하고 있는 세척수 및 침전조의 미세 부유물질의 물성과 응집침전 특성 그리고 침전조 내부에 퇴적된 석분 슬러지의 중화 특성을 평가하였다. 세척수의 초기 탁도는 2,264 NTU로 나타났고 재 이용시 1,228 NTU로 높은 탁도를 유지했다. 침전조내 부유 석분 입도(d(0.5))는 5.1-10.1μm 수준 이었다. Jar test 에 의한 응집 시험 결과 응집제 농도(1~10 mg/L)가 증가할수록 pH 3~5에서 완속교반 시간이 길수록 응집효과가 우수하였다. 석분슬러지를 산성광산배수와 반응시킨 결과 미립질 석분 (<1 mm) 에 의해 10분 경과 후 pH를 6 이상 상승 시켰고 용존 Al 및 Fe을 대부분 제거하였다.
A Note on "On the Cross-sectional Relation between Expected Returns and Betas"
Kang, C.S.,Li, Michael 동양대학교 1997 동양대학교 논문집 Vol.3 No.1
In the paper "On the Cross-sectional Relation between Expected Rectuns and Betas", Roll and Ross (1994) demonstrate that the expected rectums and betas can have zero relationship even when the underlying market portfolio proxies are nearby the difficient frontier. In this note, we derive their mathematical conclusions and thereby characterize the inefficient market proxies that can lead to the zero relationship.
이동길,강중석,지세정,김영주,강상수,김복철 한국지구시스템공학회 2008 한국지구시스템 공학회지 Vol.45 No.6
대부분의 광물자원을 해외에 의존하고 있는 우리나라는 해외 광물자원개발을 통해 안정적인 광물자원 확보가 절실하다. 2,600만명의 인구를 가진 우즈베키스탄은 중앙아시아 최대 시장이자 교통의 요충지이며 금, 동, 우라늄, 텅스텐 등의 풍부한 광물자원을 보유하고 있는 중앙아시아의 중심국이다. 우즈베키스탄의 이해과 관심을 증진시키고 광물자원개발에 관한 정보를 제공하기 위해 우즈베키스탄의 광물자원 부존 및 개발 현황, 광업정책과 법규 및 기관, 인프라 구축현황 및 자원개발 투자시 고려해야 할 사항을 제시하였다.
이동길,강중석,지세정,김영주,강상수,김복철 한국자원공학회 2008 한국자원공학회지 Vol.45 No.6
Republic of Korea that relies most of mineral resources on other countries deeply has needed to secure mineral resources through the oversea development of mineral resources. Uzbekistan has 26 millions peoples, the largest market in the Central Asia and abundant mineral resources such as gold, copper, uranium, tungsten and so on. This paper is intended to provide the current status of mineral resources and reserves, mining policies, regulations, and infrastructure of Uzbekistan in an effort to promote understanding Uzbekistan and to inform items for considering investment in the oversea development of mineral resources.
KODOS 망간단괴의 SiO<sub>2</sub>-CaO-MnO 상관관계와 분포양상
장세원,최헌수,강중석,공기수,이성록,장정해,Chang, Se-Won,Choi, Hun-Soo,Kang, Jung-Seok,Kong, Gee-Soo,Lee, Sung-Rock,Chang, Jeong-Hae 한국해양과학기술원 2004 Ocean and Polar Research Vol.26 No.2
$SiO_2$ and CaO are added to decrease the smelting temperature in the reduction-smelting method for manganese nodule processing. These elements are components of the manganese nodules and might be very important controlling factors in the processing due to the locally variable content. The 707 chemical data of manganese nodules acquired from 1994 to 2001 in KODOS(Korea Deep Ocean Survey) area were used for the hierarchical cluster analysis. The chemical data were classified by the morphological types, and the averages of the chemical data for each station were classified by the facies groups and the localities. All data are plotted on the $SiO_2-CaO-MnO$ phase diagram at $1773^{\circ}K$ to compare with the best compositional area in the nodule smelting. Variations and distributions of $SiO_2$ and CaO in KODOS nodules were also reviewed. The mineral phases assigned by the cluster analysis are CFA(Carbonate Fluorapatite), Fe-oxide, Al-silicate, and Mn-oxide. MnO contents are generally higher than $SiO_2$ contents in most of the morphological types except for the Is- and It-type. The Dt- and Tt-type show wider range and the E-types show high anomaly in their CaO contents. The stations which belong to facies group A and B show generally higher MnO contents than $SiO_2$ contents, however, the stations of facies group C and D show wide range in their MnO and $SiO_2$ contents. It seems to be very important to control the $SiO_2$ contents in the processing because of the wide range in the northern area. The additions of approximately 10 wt.% CaO and 10 wt.% $SiO_2$ are recommended for the northern area, whereas, the additions of approximately 10 wt.% CaO and 20 wt.% $SiO_2$ are recommended for the southern area.