국내 자원산업이 사회경제에 미치는 영향

오종기,김재욱,강희태,김동기,이경한,유상희 한국자원공학회 2009 한국자원공학회지 Vol.46 No.5

음이온교환수지에 의한 광산폐수중 Cr6+과 CN의 흡착특성에 관한 연구

오종기,김성규,이화영 한국자원공학회 2002 한국자원공학회지 Vol.39 No.6

A study on the adsorption of hexavalent chromium and cyanide from electroplating waste water has been investigated using anion-exchange resins such as SA10AP, PA308, IRA 400 and IRA 904. The results showed that the adsorption efficiency of hexvalent chromium increased in proportion to amount of resin and SA10AP resin was more effective adsorbent for the adsorption of hexavalent chromium from Cr-type electroplating waste water. The desorption efficiency of hexavalent chromium from resin increased with increasing the weight ratio of NaCl / NaOH. On the other hand, PA308 resin was more effective adsorbent for the adsorption of cyanide from CN-type electroplating waste water and the cyanide was adsorbed more than 98% with resin of 20 g / l . Also, the adsorption efficiency of zinc and copper which formed complex ion with cyanide appeared to be higher considerably. The desorption of cyanide from resin was not nearly affected by the concentration of NaOH, but the desorption efficiency of cyanide appeared to be very low in the degree of 40%. 도금폐수로부터 Cr6+과 CN을 분리하기 위한 흡착시 음이온 교환수지의 종류와 첨가량에 따른 흡착특성에 대해 조사하였다. 실험결과 Cr계 도금폐수 중 Cr6+의 흡착률은 수지첨가량이 증가함에 따라 증가하고 있으며, SA10AP 수지가 Cr6+의 흡착에 가장 효과적인 것으로 나타났다. 그리고 Cr6+의 탈착시 NaCl/NaOH의 중량비가 증가할수록 탈착률이 급격히 증가하여 중량비 7에서 90% 정도가 탈착되었다. 한편, 시안(CN)계 도금폐수 중 CN의 흡착에는 PA308 수지가 효과적이고 수지첨가량 20 g / l에서 98% 이상 흡착되었으며, 시안과 착화합물을 형성하는 Zn와 Cu도 흡착률이 상당히 높게 나타나고 있다. 그리고 수지에 흡착된 CN의 탈착시 NaOH 농도의 영향은 거의 없는 것으로 나타났으며, 이와 함께 수지 단위 질량당 탈착액의 양을 증가시킴에 따라 CN의 탈착률이 약간씩 증가하나 20 ml / g-resin의 탈착액을 사용하여도 탈착률이 40% 수준으로 매우 낮게 나타났다.

고밀도, 등방성 탄소의 제조에 관한 연구

오종기,이선우,박광원 한국세라믹학회 1991 한국세라믹학회지 Vol.28 No.11

The characteristics of the carbonized and calcined products made from coal tar pitch coke and coal tar pitch, were investigated in the aspect of the manufacture of isotropic graphite with high density. The mesophase from the pitch was rapidly formed at higher heat-treatment temperature between 410$^{\circ}C$ and 450$^{\circ}C$, where the insolubes in the pitch accelerated the rate of nucleation and growth of the mesophase. The benzene insolubles and the quinoline insolubes were increased as the heat treatment temperature and the heat-treatment time increased. The ratio of benzene insolubles and quinoline solubles (BI/QS) was decreased as the heat-treatment temperature was higher and maintained to be nearly constant regardless of heat-treatment time at fixed heat treatment temperature. The bulk density of the calcined carbon was linearly proportional to the ratio of quinoline solubes to volatile matter in the green coke. Anisotropic ratio of electrical resistance was measured to be between 0.98 and 1.10.

폐자동차 차피파쇄잔류물의 組咸에 대한 分析評價硏究

오종기,이화영,김성규 한국자원리싸이클링학회 2001 資源 리싸이클링 Vol.10 No.4

현재 전량매립 처분되고 있는 차피파쇄잔류물(shredder residue)의 연료로써의 활용 가능성을 모색하기 위한 분석평가시험을 실시하였다. 수집한 차피파쇄잔류물을 입도별 및 재질별 선별작업을 통해 분류하고 이들 시료에 대한 Cl, S, 회분 및 발열량에 대한 화학분석을 실시하였다. 플라스틱에 함유된 PVC의 영향으로 대상시료 3종류 중 1 종류만을 제외하고는 시료의 평균 Cl 함량은 모두 4wt%를 상회하였다 반면, S 함량은 0.25∼0.39wt%로써 비교적 낮았다. 발열량의 경우 플라스틱이 10,000kcal/kg 이상으로 가장 높았으며, 나무/종이 및 섬유류가 4,000 kcal/kg 정도로써 가장 낮게 나타났다. 차피파쇄잔류물 중의 금속성분은 Fe 가 6∼8.5 wt%인 것을 제외하고는 모두 미량인 것으로 확인되었으며, 유독성 중금속인 Hg와 Cr(VI)은 검출이 되지 않았고, Cd은 0.0004∼0.0009wt%로 극미량이 검출되었다. A research was performed to evaluate a use of shredder residue to currently dispose of at landfills. Laboratory analyses were conducted to determine especially the fuel characteristics of shredder residue. For this aim, shredder residue was classified by the particle size as well as by the type of material and the content of Cl, S, ash, and calorific value were determined. Due to the chlorinated plastic content of shredder residue, mean concentration of Cl was found to exceed 4wt% except one sample while that of S was ranged from 0.25 to 0.39 wt%. As far as calorific value was concemed, plastic was observed to be more than 10,000 kcal/kg while wood/paper and fiber accounted for approximately 4,000 kcal/kg. Shredder residue was found to contain varying trace amounts of metal elements, including Fe of 6∼8.5 wt%. Hg and Cr(VI) were not detected, however, while Cd was contained as small as 0.0004-0.0009 wt%.

산침출에 의한 광미중 비소성분의 제거에 관한 연구

오종기,이화영,김성규,이재령,박재구 한국지하수토양환경학회 1998 지하수토양환경 Vol.3 No.3

폐광산 광미로부터 비소를 제거하기 위한 산침출 및 침전실험을 수행하였다. 다덕광산의 광미시료를 대상으로 염산 및 황산농도, 침출시간, 슬러리 농도에 따른 침출율의 변화를 조사함과 동시에 침출액 중의 비소성분을 침전시키기 위하여 pH조절과 Sodium Sulfide를 첨가하여 비소의 침전율을 관찰하였다. 염산침출의 경우 1시간 침출 후 산농도 및 슬러리 농도에 따라 40%에서 86%까지 비소침출율을 보였으며, 황산의 경우 47%∼77%의 침출율을 나타냈다. 침출시간에 따른 침출율의 변화는 10분이내에서 급격한 변화를 보이지만, 그후에는 침출시간이 증가함에 따라 완만한 증가를 보였다. 침출액중의 산농도가 높아지면 침출율이 증가하나 2N이상에서는 그 차이가 크지 않았다. 침출액을 반복사용할 경우 5회까지 꾸준히 침출이 일어나지만 그 증가폭은 점차 감소하였으며, 산농도가 높을수록 감소하는 추세가 보다 완만한 경향을 보였다. 침출액 중의 비소성분은 단순한 pH조절을 통하여 약 84%까지의 침전율을 보였으며, 침전제로 Sodium Sulfide 를 사용하였을 경우 99%이상의 침전율을 나타냈다. A study on the acid leaching and precipitation has been conducted to remove arsenic from the closed-mine tailings. HCI and H$_2$SO$_4$were used as the leach liquor of arsenic and the tailing obtained from the Da-Duck Mine, which was already closed several decades ago, was also used as the source of arsenic. The effect of the concentration of acid, leaching time and the slurry density on the leaching efficiency of arsenic has been examined. In addition, pH controls and the addition of sodium sulfide were also attempted to remove the arsenic compound as the precipitation from the leachate. After 1 hr leaching by HCI, 40 to 86% of arsenic was leached out depending on the concentration of acid or the slurry density while 47 to 77% of it was leached out by $H_2$$SO_4$. The leaching of arsenic by both acids was almost accomplished within 10 min. and after that only a slight increase in leaching efficiency was observed with leaching time. When the leach liquor was used repeatedly for the leaching of arsenic, the concentration of arsenic in the leach liquor was found to increase continuously although the leaching efficiency was diminished. As far as the precipitation of arsenic in the leachate was concerned, more than 99% of arsenic could be precipitated through the addition of sodium sulfide as the precipitator while the pH controls resulted in the precipitation of up to 84%.

흑연-금속동 복합분말제조에 관한 연구

오종기,김택훈,이화영,Oh, Jong-Kee,Kim, Taek-Hoon,Lee, Hwa-Yeong 한국재료학회 1993 한국재료학회지 Vol.3 No.2

금속동-흑연복합분말을 제조하기 위하여 염화동을 흑연주위에서 수소환원시킴으로써 흑연표면에 금속동을 석출시키는 새로운 방법으로 흑연-금속동 복합재료를 제조하고자 하였으며, 이를 위해 325 mesh이하의 KISH및 천연흑연을 모재로 하여 350-50$0^{\circ}C$의 환원온도에서 염화동을 환원시키는 실험을 실시하였다. 금속동의 분산도는 환원온도가 낮을수록 양호한 것으로 나타났으며, 금속동의 분산도를 높이기 위해서는 가능한한 환원온도를 낮게하는 것이 유리한 것으로 나타났다. Abstract It has been attempted to make the copper-graphite composites by deposition of copper on the surface of graphite through the hydrogen reduction of copper chlorides. Both KISH and natural graphites of less than 325 mesh were used as substrates and the hydrogen reduction also was conducted in the range of 350-50$0^{\circ}C$. The distribution of copper on the surface of graphite was found to increase with the decrease of reduction temperature. In addition. the partial pressure of hydrogen played an important role in the overall rate of reduction which was substantially dominated by the chemical reaction on the surface of each particle. It was concluded that the reduction temperature should be maintained as low as possible to accomplish the well distribution of copper in the composites.

특집 : 비철제련과 리사이클링 ; 폐차 shredder dust로부터 비철 금속 추출

오종기,이화영,박면웅 대한금속재료학회 ( 구 대한금속학회 ) 2002 재료마당 Vol.15 No.8

연구논문 : D2EHPA 및 Versatic Acid - 10 에 의한 갈륨 용매추출의 화학양론적 평형

오종기(Jong Kee Oh),이화영(Hwa Young Lee),김성규(Sung Gyu Kim) 대한금속재료학회(구 대한금속학회) 1995 금속제련 학술회의 Vol.- No.-

수용액중 암모니아 Recycling을 위한 Air Stripping 특성에 관한 연구

이화영,오종기,김성규,Lee Hwa-Yaung,Oh Jong-Kee,Kim Sung-Gyu 한국자원리싸이클링학회 2003 資源 리싸이클링 Vol.12 No.3

수용액중의 암모니아를 리싸이클링하여 황산암모늄을 제조하기 위한 1단계 공정으로 air stripping에 의한 암모니아 탈기특성을 조사하였다. 수용액중 암모니아 탈기실험을 위하여 내경 40mm의 아크릴관을 탈기 column으로 사용하고 하단에 미세한 기체방울을 생성시키기 위하여 air sparger를 설치하는 한편 탈기가스로는 공기를 사용하였다. 탈기실험 결과 수용액 pH가 증가할수록 암모니아 탈기효율이 향상되었으며, 적정 pH범위는 10∼12 인 것으로 나타났다. 공기유량변화가 암모니아 탈기에 미치는 영향에 있어서는 공기유량이 증가함에 따라 탈기량이 비례하여 증가하지는 않았다. 또한, 수주 높이 20 cm 이상에서 절대 탈기량은 수주 높이에 관계없이 일정하게 나타났다. 탈기 온도를 높일수록 암모니아 탈기속도는 크게 증가하여 pH 12.8, 탈기 온도 $60^{\circ}C$에서 14시간 탈기시 초기 암모니아의 90% 정도를 탈기시킬 수 있었으며, 탈기 온도는 수용액 pH와 함께 암모니아 탈기공정의 가장 중요한 변수임을 확인할 수 있었다. A study on the characteristics of ammonia desorption from aqueous solutions has been performed by air stripping as the first stage of ammonia recycling for the preparation of ammonium sulfate from it. For air stripping experiments, a stripping column made with acrylic tube of 40 mm diameter was employed and compressed air was injected into solutions through air sparger equipped at the bottom of stripping column. As a result of experiments, the stripping efficiency was increased with the aqueous pH and it was found that the appropriate pH for air stripping of ammonia was between pH 10 and 12. As far as the effect of air flow rate on ammonia stripping was concerned, ammonia stripping was not proportional to the air flow rate although it was affected by the air flow rate to some extent. Moreover, when more than 20 cm of water height was maintained, total ammonia desorbed from solution was not varied with the water height. Stripping temperature was also found to play an important role in ammonia desorption and about 90fo of initial ammonia was desorbed in 14 hours at pH 12.8 and at $60^{\circ}C$ Finally, it was believed that stripping temperature as well as the aqueous pH was one of the most important factors in air stripping of ammonia.

廢自動車 ASR의 風力 및 比中選別에 의한 處理 硏究

이화영,오종기,Lee, Hwa-Young,Oh, Jong-Kee 한국자원리싸이클링학회 2005 資源 리싸이클링 Vol.14 No.2

폐자동차 ASR으로부터 염소성분을 제거하기 위하여 풍력선별 및 비중선별 실험을 수행하였다. 또한, ASR플라스틱만을 분리하여 물을 매체로 한 비중선별을 실시하였다. ASR 시료는 모두 8 mm이하로 재분쇄하여 선별실험에 사용하였으며, 플라스틱은 3가지 입도로 나누어 비중선별 실험을 하였다. 풍력선별은 공기유량 9~20 M$^3$/hr 범위의 1단계와 공기유량 25~34 M$^3$/hr 범위의 2단계로 나누어 실시하고 각 산물의 비율과 재질분포를 조사하였다. 1단계 풍력선별후 underflow 산물의 비율은 62~66%인 것으로 나타났으며, 공기유량이 큰 2단계 풍력선별에서는 overflow 산물의 비율이 크게 증가하였다. 폐플라스틱만을 대상으로 한 비중선별 실험결과 부유물질이 침강물질에 비해 다소 많게 나타났으며, 염소함량에 있어서는 최대 수백개의 염소함량 차이를 보여 순수 플라스틱의 경우 매우 우수한 염소함유 재질의 분리효과를 얻을 수 있었다. A study on the air and gravity separation has been performed for the removal of chlorine containing materials from ASR of end-of-life vehicles. The gravity separation was also conducted on waste plastics collected from ASR. In this work, ASR were previously shredded to pass through 8 mm sieve prior to separation tests and the gravity separation of waste plastics was conducted for three different particle sizes. The two-stage air classification was conducted with the range of air flow rate of 9~20 M$^3$/hr at first stage and 25~34 M$^3$/hr at second stage, respectively. The fraction of overflow product was remarkably increased in the 2nd stage air classification because of high air flow rate while that of underflow product obtained from 1st stage air classification was found to be 62~66%. From the results of gravity separation on waste plastics, it was also found that the amount of the float product was much greater than sink product. It is believed that the gravity separation may be used very efficiently for the removal of calorine bearing materials from waste plastics.