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RAHUL KUMAR,Shouvik Saha,Sarita Dhaka,Mayur B. Kurade,강찬웅,백승한,전병훈 한국자원공학회 2017 Geosystem engineering Vol.20 No.1
Mining industry has been using cyanide for more than ten decades to recover precious metals such as gold and silver. The presence of cyanide in the environment has long been a matter of concern due to its high toxicity to human, animal, and aquatic life. The available treatment processes either physical or chemical are suffered with issues such as operating conditions, generation of secondary pollution, and lack of cost effectiveness. A number of micro-organisms are capable to consume cyanide as a source of carbon and nitrogen, and convert it into ammonia and carbonate. Some plants are also efficient in cyanide attenuation process. Bioremediation of cyanide might be an efficient, cost-effective, eco-friendly, and an attractive alternative to the conventional physical and chemical processes. This paper reviews the recent advances in remediation of cyanide contaminated tailings via micro-organisms and plants. Aspects such as speciation, toxicity, source, and degradation mechanisms of cyanide are discussed. Factors affecting functioning of micro-organisms and plants as bioremediation agents are also highlighted.
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Tingsheng Qiu,Yuanqing He,Xianhui Qiu,Xiuli Yang 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.45 No.-
Density functional theory calculations,flotation behavior, X-ray photoelectron spectroscopy, and infraredspectra were combined to reveal the Cu2+ activation mechanism on a cyanide (CN )-leached sphaleritesurface. Low CN adsorption enhanced the activation capability of Cu2+ on the sphalerite surface,whereas the hydrophilicity of the sphalerite increased with increasing CN coverage, which hindered Cu2+ adsorption. As the amount of chemically adsorbed Cu2+ on the sphalerite surface increased, Cu2+ beganto desorb CN , leading to the same result, which is consistent with the low CN coverage.
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박제현,박일환,오주미,유경근 한국자원공학회 2018 한국자원공학회지 Vol.55 No.5
The treatment cost for removing heavy metals from tailings and contaminated soils has been determined to be more expensive than for solidification and stabilization processes. The objective of this study is to enhance the economic feasibility of the removal process by investigating the cyanide leaching, adsorption, and desorption of gold using activated carbon particles. Our study found that the leaching efficiency of gold decreased by increasing the particle size and pulp density and by decreasing cyanide concentration to 0.1%. The trace gold particle could be exposed to cyanide solution when it was fine-ground and cyanide was lost with decreasing pH when the gold had a high pulp density and low cyanide concentration. The adsorption behavior of gold on the activated carbon particle was investigated using Freundlich and Langmuir adsorption isotherm equations. The adsorption results showed good agreement with the Freundlich adsorption isotherm, and the desorption efficiency of gold increased with pH and temper ure. 광미 및 오염토양으로부터 중금속을 제거공정은 고형화 및 안정화법에 비하여 처리비용이 높은 것으로 알려 져 있다. 이 연구에서는 금의 회수를 위한 시안침출, 활성탄 흡착과 탈착 중 금의 기초거동을 조사하여 제거공정의 경 제성 향상을 도모하고자 하였다. 금의 침출율은 입자크기가 클수록 시안농도가 0.1 % 정도로 낮을수록 광액농도가 증가할수록 감소하였다. 금은 미량으로 존재하므로 시료가 미분쇄될수록 시안용액에 노출되는 금의 양이 증가하는 것이 원인으로 판단되었으며, 시안농도가 낮거나 광액농도가 증가하면 pH가 낮아지는데 낮은 pH에서 시안이 증발하 여 소모되는 것이 낮은 침출율의 원인으로 판단되었다. 침출된 금의 활성탄에 대한 흡착거동은 Freundlich 흡착등온 식과 Langmuir 흡착등온식을 이용하여 각각 분석하였으며, 흡착결과는 Freundlich 흡착등온식에 부합하였다. 마지 막으로 활성탄에 흡착된 금의 탈착거동은 pH와 온도가 증가할수록 탈착율이 증가하는 것이 관찰되었다.
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기계적-화학적 활성화에 따른 금-은-정광의 광물학적 상변화와 비-시안 용매에 의한 금-은 용출 향상
김봉주 ( Bong Ju Kim ),조강희 ( Kang Hee Cho ),오스지 ( Su Ji Oh ),최낙철 ( Nag Choul Choi ),박천영 ( Cheon Young Park ) 한국광물학회 2014 광물과 암석 (J.Miner.Soc.Korea) Vol.27 No.3
금-은 함유 황화광물 정광으로부터 Au와 Ag를 용출시키기 위하여 황화광물 정광을 건식과 습식으로 전처리하였다. 전처리한 황화광물에 대하여 광물학적 연구와 티오요소 용출실험을 수행하였다. 평균입도와 등전위는 정광시료에서 보다 건식 전-처리 시료에서 낮게 나타났고, 건식 전-처리 시료 보다 습식 전-처리 시료에서 더 낮게 나타났다. XRD 분석결과, 습식 전-처리 시료에서만 비정질의 특성이 나타났다. 정광시료에서, 최대의 Au, Ag 용출인자는 1.0 g의 티오요소, 1.0 M의 황산제2철, 2.0 M의 황산 농도에서 그리고 60℃의 용출온도에서였다. Au, Ag용출률은 건식 전-처리 시료에서 보다 습식 전-처리 시료에서 언제나 많이 그리고 빠르게 나타났다. 따라서, 향후 적당한 미분쇄 첨가제와 시간으로 전처리를 수행하고 비-시안 용매를 적용한다면 친환경적으로 Au, Ag를 용출시킬 수 있을 것으로 기대된다. In order to leach Au and Ag from gold-silver bearing sulfide concentrate, the sulfide concentrate was ground in a ball mill for a dry pre-treatment and a wet pre-treatment process. Mineralogical studies and thiourea leaching experiments were carried out with the pre-treated sulfide concentrate. The results of the pre-treatment with the concentrate samples showed the mean particle size and iso-electrical potential was smaller in the dry pre-treatment sample than in the concentrate sample, and the contents was lower in the wet pre-treatment sample than in the dry pre-treatment sample. In XRD analysis, amorphous properties were only shown in the wet pretreatment sample. The results of the concentrate sample leaching experiments showed that the best Au, Ag leaching parameters were when the addition of thiourea was at a 1.0 g concentration, ferric sulfate was 1.0 M, sulfuric acid was 2.0 M and the leaching temperature was at 60℃. The Au, Ag leaching rate was always much greater and faster with the wet pre-treatment samples than with the dry pre-treatment samples. Accordingly, it is expected that more Au, Ag can be leached in an eco-friendly methodology using wet pre-treatment. The pre-treatment could be improved with an optimized grinding additive reagent and through researching grinding time in future non-cyanide processes.
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