實驗計劃法을 적용한 ZnO의 NH4Cl 浸出 硏究
Application of Factorial Design to NH4Cl Leaching of ZnO
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초록
실험계획법을 이용하여 염화암모늄용액에 의한 산화아연의 침출에 대한 연구를 수행하였으며 주요 침출변수들의 영향을 조사하였다. 실험결과의 분석으로부터 염화암모늄의 농도, 고/액 비, 침출온도 및 기타 교호작용 등이 유효한 인자로 나타났으며, 이로부터 침출거동의 96%를 설명할 수 있는 침출모델식을 얻을 수 있었다. 또한 일정 경향성을 보이는 잔차 분석으로부터 침출반응 후 용액의 온도 저하에 의해 생성되는 Zn(NH3)2Cl2 침전이 침출모델의 적합결여(Lack-of-Fit)을 유발하는 것임을 알 수 있었다. Zn(NH3)2Cl2 침전의 생성은 침출액의 pH를 적절히 높임에 따라 감소하였으며, 이는 Zn(NH3)2Cl2 침전에 의한 아연전해회수 등 후속 공정에서의 문제발생을 효과적으로 예방할 수 있음을 의미한다.
Abstract
The leaching of zinc oxide by NH4Cl solution was studied using the factorial design method to determine the effects of major leaching parameters. Analysis of experimental results suggested that the effective parameters were concentration of NH4Cl solution, solid/liquid ratio, leaching temperature, and interactions between them. Based on the results, a model equation for the leaching was suggested by which 96% of leaching behavior could be explained. The residual analysis revealed that the precipitation of Zn(NH3)2Cl2 tends to induce the lack-of-fit of the model. The precipitation of Zn(NH3)2Cl2 was reduced by raising pH of leaching solution properly. This suggests that the problems which may occur by the precipitation of Zn(NH3)2Cl2 could be prevented effectively.
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