마이크로웨이브 가열에 의한 황비철석의 선택적 상변환과 티오시안산염 용액에 의한 Au 회수율 향상

한오형,김봉주,조강희,최낙철,박천영 한국광물학회 2014 광물과 암석 (J.Miner.Soc.Korea) Vol.27 No.2

Micro-bubble Column에 의한 Molybdenite의 부선특성

한오형,강현호,전호석 한국자원공학회 2009 한국자원공학회지 Vol.46 No.3

All of the molybdenite consumed in Korea depended on imports until 2005. But it suffered from surge in molybdenite price in the global market and volatile supply triggered by the embargo imposed on the ore by the Chinese government to protect its industry which is the main source of imported ore. In order to stabilize supply of molybdenite and for the protection of the associated industry, Korea developed mines since 2006. However, the quality of raw ore is low, marking Mo 0.3%, requiring the industry to develop new separation techniques for efficient separation of low garde molybdentie to provide the domestic market with high quality product. Therefore, in this experiment, by employing micro-bubble column separation technique on imported ore within Mo 50% flotation concentrate, a fine particle separation technique without cleaning was established yielding Mo 57% high quality ore with 90% recovery. Also, as a result of SEM & Mapping of each element to check the liberation of the particle, in the case of Cu (impurity), limit on complete separation was identified due to the bond between Cu ultra fine particle under 6.62 ㎛ and Mo. 우리나라는 2005년까지 몰리브덴광의 전량을 수입에 의존하였으나, 가장 큰 수입국인 중국이 자국 산업보호를 위한 수출 통제를 시행함으로 가격급등은 물론 원료의 안정적 확보를 위한 심각한 문제를 초래하였다. 이에 우리나라에서는 몰리브덴광의 안정적 확보 및 관련산업의 보호를 위해 2006년부터 국내 광산을 개발하고 있으나, 원광의 품위가 Mo 0.3%로 매우 낮아 저품위 몰리브덴광을 효율적으로 선별할 수 있는 국내 광산에 적합한 새로운 고도 선별기술 개발이 필요하다. 따라서, 본 실험에서는 국내에 수입된 Mo 50%이내의 부선 정광을 대상으로 micro-bubble column 선별법을 적용하여, 정선과정 없이 Mo 57% 이상의 고품위 정광을 90% 이상 회수할 수 있는 미립자 선별기술을 확립하였다. 또한 급광, 정광, 광미를 각각 SEM & 원소별 mapping 한 결과 불순물인 Cu의 경우, 6.62 ㎛ 이하의 극미립으로 Mo와 결합되어 있어 완벽한 단체분리에 한계가 있음을 확인하였다.

Microbubble Column에 의한 인상흑연(鱗狀黑鉛)의 부선(浮選)에 관한 연구(硏究)

한오형,강현호,Han, Oh-Hyung,Kang, Hyun-Ho 한국자원리싸이클링학회 2006 資源 리싸이클링 Vol.15 No.2

국내 흑연광의 총 매장량은 약 260만 톤 정도이지만, 국제경쟁력을 가지지 못해 현재는 일부 광산에서만 채광하고 있다. 그러나 최근 휴대용 전자제품의 수요가 증가함에 따라 2차 전지의 전극에 사용되는 고순도의 흑연을 전량 고가로 수입에 의존하고 있어, 고순도 흑연의 국산화를 위한 연구가 필요한 실정이다. 그러므로 본 연구에서는 고순도 흑연을 생산하기 위한 전처리 단계로서 29.50% F.C.의 원광($D_{50}=69.393{\mu}m$)시료를 attrition mill에서 20분 마광($D_{50}=10.314{\mu}m$)하여 microbubble column을 이용하여 실험한 결과 정선과정 없이도 95% F.C. 이상의 산물을 90%이상의 회수율로 얻을 수 있었다. The total amount of graphite reserves in Korea is about 260 thousand tons. Graphite larks international competitiveness it is mined in only few mines, but recently the demand of portable electronic has increased. Therefore a research for manufacturing domestic high purity graphite is necessary because all of high purity graphite used electrode of 2nd batter depends on expensive importation. A preprocessing level for producing high purity graphite, flotation was conducted using microbubble column machine. In this research $D_{50}=10.314{\mu}m$ sample was used which was produced after grinding 29.50% F.C. primary crushing sample($D_{50}=69.393{\mu}m$) for 20 minutes through attrition mill. As a result using this sample, product above 95% F.C. with recovery over 90% was obtained with only after first stage process through the microbubble column.

鑛山發水中 Cu^2+ 이온除去에 關한 硏究

韓五炯 조선대학교 동력자원연구소 1980 動力資源硏究所誌 Vol.2 No.1

The removal of copper ion from mine water has been investigated by precipipitation test with the precipitator and flotation method. The precipipitation of Cu^2+ ion with precipitator was investigated in terms of varied of precipitaor, pH and reaction time. The floatability of Cu^2+ ion with collectors was tested according to adding amonnt of xanthate and r.p.m. of the impeller. The results obtained by this metod are as follows. 1) The precipitation of copper ion by sodium sulfide decreased around pH8.0 and the precipitation rate of copper ions was generally in inproved with adding Flocculant. 2) The residual concentration of Cu^2+ ion can be reduced to the water quality criterion by use of suitable amount of xanthate. 3) The use of excess amount of xanthate, however tends to decrease the removal percent of Cu^2+ ion. 4) The effect of aeration by which Cu-xanthate particles are flocculated may by interpreted in terms of "Pseudo-flocculation" i.e. the flocculation of particles through air bubbles.

염화물 용매제를 이용한 연⋅아연정광의 용출특성 및 광물학적 해석

한오형,박천영,김봉주,조강희,오스지,최낙철 한국자원공학회 2013 한국자원공학회지 Vol.50 No.4

In order to optimize copper, lead and zinc leaching from complex sulfide minerals, HCl-NaClO-FeCl3 solution with varying attributes was applied to the roasted concentrate. The complex sulfide consisted of anglesite, galena, chalcopyrite, pyrite and sphalerite, which these minerals were transformed to anglesite, quartz and hematite by roasting at 750℃. In XRD analysis, cotunnite and anglesite were observed in the solid residue from aqua regia. The concentrate samples tested with the chlorine-hypochlorite solution were roasted at 750℃. The results of the differing experimental conditions showed that the highest copper, lead and zinc leaching rate was found when the hydrochloric acid and sodium hypochloritde mixing ratio was at 1:2 with ferric chloride at 10.0 g and the leaching temperature at 60℃. It is confirmed that with only the use of HCl-NaClO solution, galena and sphalerite completely dissolved without addition of FeCl3 at room temperature. 복합 황화광물로부터 Cu, Pb 및 Zn을 최적으로 용출시키기 위하여 HCl-NaClO-FeCl3 용액을 소성정광에 적용하였다. 복합 황화광물은 anglesite, 방연석, 황동석, 황철석, 섬아연석으로 구성되었으며 이 황화광물을 750℃로 소성시킨 결과, anglesite, 석영, 황철석 및 적철석으로 변환되었다. 왕수분해 잔류물에 대하여 XRD분석한 결과 cotunnite와 anglesite가 관찰되었다. 750℃로 소성시킨 정광을 염소-차아염소산 용액에 사용하였다. 다양한 변수로 용출실험을 수행한 결과 Cu, Pb, Zn의 용출율이 최대로 나타나는 인자는 염산과 차아염소산나트륨 혼합 비율이 1:2 일 때, 염화제2철의 첨가량이 10.0 g일 때 그리고 용출온도가 60℃일 때 였다. FeCl3를 첨가하지 않고 상온에서 단순히 HCl-NaClO 용액 만 사용해도 방연석과 섬아연석이 완전하게 용해되는 것을 확인하였다

NBQ에 의한 황화광물의 선택성에 대하여

한오형 조선대학교 동력자원연구소 1992 動力資源硏究所誌 Vol.14 No.2

In most flotation process of sulfide minerals, the sodium cyanide as a depressant of pyrite is still widely used, but it has been generated environmental pollution by CN^- ion. The possibility of industilization has been investigated in copper ore and Pb/Zn ore flotation under conditions of quinonoid compounds insteaded of sodium cyanide. The best degree of liberation in flotation tests was 60% -200mesh. It was founded that the depressing effect of pyrite was increased with the concentration of quinonoid compounds in all ranges of pH. In Pb/Zn flotation, the optimum concentrations of the quinonoid compounds appeared to be about 1×10^-5M.

토착호산성 박테리아를 이용한 황동석 정광에 대한 생물학적 용출 특성 - 상온에서의 칼럼 용출 -

한오형,박천영,조강희 한국자원공학회 2010 한국자원공학회지 Vol.47 No.5

계대배양 된 토착박테리아들을 황동석이 충진 된 칼럼에 접종하고 상온에서 그리고 황산을 첨가하지 않고 용출실험을 실시하였다. 비록 이런 조건에도 불구하고, 미생물에 의하여 황동석 정광으로부터 유용금속 이온이 용출될 수 있는지를 확인하고자 하였다. 한국과 일본지역에서 광산산성배수, 광산폐석토양, 폐석탄 및 온천수에 서식하는 토착박테리아들을 성장-배양액에서 32℃로 배양하였다. 성장-배양액에서 토착박테리아가 성장함에 따라 pH가 감소하고 Eh는 증가하였다. 토착박테리아를 황동석 칼럼에 28일 동안 반응시킨 결과 비교시료에서 보다 박테리아 시료에서 Fe 이온은 184 배 이상으로, Zn은 6배 이상으로, Cu는 3.3 배 이상으로 그리고 As는 2.7배 이상으로 용출되었다. 따라서, 상온에서 그리고 황산을 첨가하지 않은 실험 조건에서 heap leaching이나 dump leaching으로부터 유용금속을 용출시킬 수 있을 것으로 기대된다. This study was to investigate the bioleaching for chalcopyrite using subcultured indigenous acidophilic bacteria without addition of sulfuric acid at room temperature. Even through these condition, the possibility of bioleaching was identified to leach the usable metal ions from chalcopyrite concentrate. The indigenous bacteria were collected from the acid mine drainage, mine waste soil, coal waste and hot spring in the Korea and Japan, and cultured in the growth-medium at 32℃. On the indigenous bacteria growing in the growth-medium at 32℃, the pH value was gradually decreased over time and the Eh value increased with time. After 28 days inoculation with chalcopyrite column without sulfuric acid at room temperature, the content of Fe, Zn, Cu and As enriched 184, 6, 3.3 and 2.7 times more in the bacterial sample than the control sample. Accordingly, it is respected that the heap and dump leaching will be possible to leach the usable metal ions from the experiment no addition sulfur acid at room temperature.

정전선별법에 의해 Cyclone Reject로부터 고품위 석탄회의 분리

한오형 한국자원공학회 2008 한국자원공학회지 Vol.45 No.1

Recently, imported bituminous coals used in coal-fired power plants are pulverized into finer particles in order to increase combustion efficiency. So it is difficult to obtain high grade ash. But in some plants, coarse particles are produced by cyclone reject during the classification process of fly ash. Therefore in this study, production possibilities of high grade ash were confirmed by performing an experiment using conductive induction with cyclone reject. As a result, below 1% LOI with above 80% recovery high grade ash was obtained, but in the case of unburned carbon there was a difficulty during separation due to fine particle ash inside the unburned carbon. These facts were verified by SEM microscope photographs and EDS analysis.

平行心拔에 依한 坑道發破에 關한 硏究

韓五炯 조선대학교 동력자원연구소 1984 動力資源硏究所誌 Vol.6 No.1

The center cut blasting is necessary for the effect of blasting to increase because free face is only one in the tunnel excavation in mine. This center cut blasting method is classified as parallel holes and angle holes, however, the parallel holes has presently adopted in general due to the operation of the deep hole blasting in field. There are typically two kinds of burn-cut and coromant cut in these parallel holes excavation. In this study, the two kinds of method was used to be combined with each othe because these methods have two different characteristics. The results of this experimentation is as follows. 1) The small hole (35Φ in diameter) being drilled close to the large hole (75Φ), the data of the results showed as the same effects as to be mixed with two holes in diametor. 2) Using the low density explosives, i.e. ANFO and slurry, the effects of blasting is in creased due to energy distribution. 3) The detonator used in this center cut blasting showed much more effection in the delay detonator. 4) The quantities of charges is much effective in increasing about 10% more than theoretical values.

정전선별기에 의한 미립석탄회의 효과적 분리에 대한 연구

한오형,박병욱 한국자원공학회 2005 한국자원공학회지 Vol.42 No.4

최근 국내 석탄 화력발전소에서 연료로 사용하고 있는 수입유연탄은 비교적 품위가 높으며 이들의 연소효율을 높이기 위해 미분쇄를 하기 때문에 여기서 발생되는 석탄회는 70 wt.% 이상이 500 mesh보다 작은 미립으로 이루어져 있다. 그러므로 이전에 개발된 석탄회의 선별기술을 사용하여 미립의 미연탄소분을 제거하는데 어려움이 따르게 된다. 본 연구에서는 미립의 석탄회로부터 미연탄소분을 효과적으로 분리하기위해 이미 개발된 정전유도에 의한 선별장치의 V형 전극바닥에 초고압코팅제와 플라스틱 페인트로 코팅하는 방법과 바닥전극을 분할하여 분할된 전극사이를 절연체인 플라스틱으로 채워 적용전압을 높이는 방법을 사용하였다. 그 결과 전극 끝부분에 강하고 치밀한 전기장이 형성되어 기존의 선별장치에 비해 1.5∼2.0배의 선별효율을 얻을 수 있었다. Recently, bituminous coals used in coal-fired power plants are pulverized into finer particles in order to increase the combustion efficiency. Because of these reasons most of fly ash produced here consist more than 70 wt.% passing 500 mesh. Therefore, it is more difficult to separate the unburned carbon from the fly ash. This study was conducted to separate the unburned carbon from fine fly ash more efficiently using an exciting electrostatic separator with several modifications. The modifications included (i) undercoating the V-shaped trough with insulation super high voltage coating (ii) undercoating with plastic coating and (iii) filling the separated electrodes with plastic insulator. These procedures increased the separation efficiency more than 1.5∼2.0 times with the formation of strong and high-density electric fields at the end of each separated electrode.