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전희동(Hee-Dong Chun),노유미(Yu-Mi Roh),박성국(Sung-Kuk Park),김주한(Ju-han Kim),신창훈(Chang-hoon Shin),김주엽(Ju-yup Kim),안재우(Jae-woo Ahn) 한국청정기술학회 2008 청정기술 Vol.14 No.2
LCD 제조공정에서 배출되는 폐에칭액으로부터 조(粗)인산 회수 후 잔류하는 질산, 초산 혼산폐액을 분리하여 자원화함으로써 고부가가치화하고 2차 폐수의 발생이 없는 친환경적인 청정 재활용기술을 개발하고자 진공증발을 이용하여 혼산폐액을 분리하였다. 진공도 -760 ㎜Hg 조건에서 온도의 따른 진공증발 결과 33℃ 이하에서는 초산만 증발되었으나 33℃ 이상에서는 초산과 함께 질산이 미량 증발되었다. 초산 회수율을 높이고 질산 증발을 억제하기 위하여 -760 ㎜Hg, 40℃ 조건으로 증발시간에 따른 증발거동을 조사하고 회수되는 증발량을 고려하여 추가로 물과 원액을 공급하였다. 또한 질산만 선택적으로 반응하도록 20 g/L NaOH를 소량씩 단계적으로 공급하였다. 질산 증발은 batch type 에서는 7%이었으나, 물 추가 시 0.78%, 원액 추가 시 0.25%까지 감소하였다. 20 g/L NaOH를 소량씩 단계적으로 공급한 결과 초산 회수율은 100%까지 증가하였으며, 질산은 6.22%까지 증발하였다. The waste solution, which was discharged from the recovery process of LCD etching solution, consists of 15 wt% nitric acid and 20 wt% acetic acid. In this study, it was conducted to separate acid individually from the mixed acid by vacuum evaporation under -760 ㎜Hg gauge and at 40℃. We have investigated evaporation behavior of acid as a function of temperature. There have been problems that tiny amount of nitric acid were evaporated simultaneously above 33℃. Thus, efforts were conducted to recover acetic acid by vacuum evaporation with adding H₂O, waste mixed acid and 20 g/L NaOH for a curb on evaporation of nitric acid. By adding H₂O, evaporation of nitric acid was reduced from 7% to 0.78%. However, it was reduced from 7% to 0.25% by adding mixed acid. In view of the results achieved so far, we may expect to separate the etching solution individually by controlling vacuum conditions.
박성국,전희동 ( Sung Kook Park,Hee Dong Chun ) 한국공업화학회 1995 공업화학 Vol.6 No.5
제철공정에서 발생되는 산화철, 폐산, 폐아연양극, Scrap 등의 폐기물을 이용하여 전기도금원액으로 사용되는 염화제일철 수용액을 제조하는 공정을 개발하였다. 이 공정은 다음과 같은 3단계로 이루어진다. 1) 주 원료인 산화철과 폐산에 함유되어 있는 Cr, Al, Mn, Ni, Na, Mg, K 등의 불순물 제거 및 산화철 용해공정, 2) 염화제이철 수용액의 염화제일철 수용액으로의 환원공정, 그리고 3) 제조한 염화제일철 수용액의 품질평가. 원료로 사용한 산화철 중에 함유된 불순물을 감소시키기 위해서는 각 불순물과 산화철의 염산용액에서의 용해속도 차이를 이용하였다. 불순물을 제거한 산화철을 용해시켜 얻은 염화제이철 수용액을 도금용액으로 사용할 수 있는 염화제일철 수용액으로 환원시키기 위하여 본 연구에서는 Steel chip, 폐아연 양극 등을 사용하였다. 본 연구를 통하여 제조한 염화제일철 용액을 사용하여 전기도금을 행하고 도금특성을 평가한 결과, 도금층의 Fe 함량, 조직의 치밀도, 표면조도, 광택도, 백색도 등이 현재 국내 도금공장에서 시판되는 도금용액을 사용하여 제조한 것과 유사한 것으로 나타났다. A recycling process of metallic wastes from a steel plant such as iron oxide, waste acid, spent zinc anode, scrap to ferrous chloride electroplating solution was developed. The process consists of three steps : 1) minimization of impurities contained in wastes 2) reduction of ferric chloride to ferrous chloride with metallic reducing agent and 3) properties evaluation of recycled ferrous chloride solution. In order to decrease the content of impurities such as Cr, Al, Mn, Ni, Mg, Na and K in iron oxide which is the main waste used in this study, dissolution and precipitation steps were used. Ferric chloride solution formed by the dissolution of iron oxide must be reduced to ferrous chloride which can be used as electroplating solution. In this study, the characteristics of reduction process with steel chips and waste zinc anode were examined. Property evaluation of manufactured ferrous chloride solution through quality test of electroplated layer was conducted. Fe content, microstructure, surface roughness, brightness and whiteness of electroplated layers were similar to those by commercial ferrous chloride electroplating solution.
곽종명,이병국,전희동,허탁 ( Jong Myung Gwak,Byung Kook Lee,Hee Dong Chun,Tak Hur ) 한국공업화학회 1997 응용화학 Vol.1 No.1
Recently, Life Cycle Assessment(LCA) attracts public attention as one of the most widely used technical methods for evaluating environmental impacts associated with the life cycle of a product system. In this paper, a LCA study was carried out to access the environmental impact of a beverage can system throughout its entire life cycle. The life cycle of 250㎖ 2 piece-can is chosen as a product system to be studied, and 250 ℓ of beverage are defined as the functional unit. For Life Cycle Inventory Analysis(LCI), the process trees for the life cycle of 250㎖ 2 piece-can are constructed by connecting individual unit processes. Then, the life cycle inventory table for the present product system is established by identifying, quantifying, normalizing, calculating, and aggregating all the inputs and outputs related to each unit process based on the defined reference flow(1000 pieces of 250㎖-can). A number of inventory parameters identified in the inventory table are converted into environmental impacts by conducting Life Cycle Impact Assessment(LCIA), where classification, characterization, and valuation are carried out. It turns out that CO₂ is the most problematic emission throughout the life-cycle of steel can system and the use of electricity in the manufacturing stage of steel can is the biggest source for the total emissions associated. In particular, the electricity is responsible for about 22% of CO₂ emission which may cause the global warming effect.