電解生成鹽素에 의한 廢印刷回路基板으로부터 구리 浸出 -實驗計劃法 適用에 의한 浸出 影響因子의 分析-
Leaching of copper from waste PCBs with electro-generated chlorine -Analysis of experimental factors on the leaching by the factorial design-
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초록
전해생성염소를 산화제로 사용하여 폐인쇄회로기판으로부터 구리의 침출에 대한 연구를 수행하였다. 구리침출반응과 관련된 실험인자들의 영향을 정량적으로 파악하기 위하여 실험계획법을 적용하였다. 실험결과의 분산분석으로부터 전류밀도, 침출온도, 염산농도 그리고 침출온도와 염산농도의 교호작용 등이 구리침출에 유효한 인자로 나타났다. 이들 중 구리침출에 가장 큰 영향을 미치는 인자는 침출실험 결과해석의 95.7%를 차지하는 전류밀도로 분석되었다. 실험결과의 중회귀분석을 이용하여 침출실험 결과의 99%를 설명할 수 있는 침출 모델식을 얻었다. 또한 모델식을 통한 구리 등침출선의 예측으로부터 침출온도가 높아질수록 구리침출량의 증가에 대한 염산농도의 영향이 커지는 것을 알 수 있었다.
Abstract
The leaching of Cu from waste PCBs was investigated with electro-generated chlorine as an oxidant. The leaching experiments were carried out according to the design of experiments to analyze quantitatively the effect of parameters on copper leaching. From the analysis of variance (ANOVA) it was suggested that the effective parameters were current density, temperature, concentration of HCl, and the interaction between the concentration of HCl and temperature. Especially, the effect of current density was analyzed to contribute to the interpretation of result for copper leaching up to 95.7%. A multiple regression model obtained from the analysis of effective parameters explained 99% of leaching results. From the model equation, it was found that the effect of HCl concentration on copper leaching increased with temperature.
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