도금폐수로부터 철, 구리, 아연 및 니켈 등 중금속을 분리ㆍ회수하기 위한 용매추출시 추출제의 종류 및 평형 pH에 따른 각 금속의 분리효과를 조사하였다. 실험결과 아연은 추출제로 PC-88A가 가장 효과적이며, pH 2.5에서 100% 추출할 수 있다. 구리와 니켈은 LIX 84를 사용하여 추출하면 각각 pH2에서 100% 그리고 pH4~5에서 90% 이상 추출할 수 있다. 한편, 중금속이 혼재한산ㆍ알칼리계 도금폐수에 대한 용매추출에서는 먼저 3가 철을 지방산인 20%의 Naphthenic acid나 10%의 Versatic acid-10로 pH2∼2.5 부근에서 분리ㆍ회수하고, 그 다음에 3%의 LIX 84를 사용하여 pH2에서 구리를 용매추출하여 분리하고 난 후 20% PC-88A 로 pH2.5∼3에서 아연을 용매추출하여 회수하면 수상에 니켈만이 잔류하여 각각의 금속분리가 가능하다.
도금폐수로부터 철, 구리, 아연 및 니켈 등 중금속을 분리ㆍ회수하기 위한 용매추출시 추출제의 종류 및 평형 pH에 따른 각 금속의 분리효과를 조사하였다. 실험결과 아연은 추출제로 PC-88A가 가장 효과적이며, pH 2.5에서 100% 추출할 수 있다. 구리와 니켈은 LIX 84를 사용하여 추출하면 각각 pH2에서 100% 그리고 pH4~5에서 90% 이상 추출할 수 있다. 한편, 중금속이 혼재한산ㆍ알칼리계 도금폐수에 대한 용매추출에서는 먼저 3가 철을 지방산인 20%의 Naphthenic acid나 10%의 Versatic acid-10로 pH2∼2.5 부근에서 분리ㆍ회수하고, 그 다음에 3%의 LIX 84를 사용하여 pH2에서 구리를 용매추출하여 분리하고 난 후 20% PC-88A 로 pH2.5∼3에서 아연을 용매추출하여 회수하면 수상에 니켈만이 잔류하여 각각의 금속분리가 가능하다.
A study on the separation of heavy metals such as iron, copper, zinc and nickel from electroplating waste water has been investigated. The results showed that the PC-88A was more effective extractant for the extraction of zinc and the efficiency of zinc was to be about 100% at pH 2.5. And copper and...
A study on the separation of heavy metals such as iron, copper, zinc and nickel from electroplating waste water has been investigated. The results showed that the PC-88A was more effective extractant for the extraction of zinc and the efficiency of zinc was to be about 100% at pH 2.5. And copper and nickel were extracted about 100% at pH 2 and more than 90% at pH 4~5 with LIX 84, respectively. On the other hand, in the case of solvent extraction of electroplating waste water(Acid-Alkali type) containing heavy metals, the ferric ion was first extracted at pH 2∼2.5 with 20% Naphthenic acid or 10% Versatic acid-10. And then, copper and zinc were extracted at pH 2 with 3% LIX 84 and at pH 2.5∼3 with 20% PC-88A respectively, remaining nickel in the raffinate. In this manner, the heavy metals in electroplating waste water could be effectively separated with solvent extraction method.
A study on the separation of heavy metals such as iron, copper, zinc and nickel from electroplating waste water has been investigated. The results showed that the PC-88A was more effective extractant for the extraction of zinc and the efficiency of zinc was to be about 100% at pH 2.5. And copper and nickel were extracted about 100% at pH 2 and more than 90% at pH 4~5 with LIX 84, respectively. On the other hand, in the case of solvent extraction of electroplating waste water(Acid-Alkali type) containing heavy metals, the ferric ion was first extracted at pH 2∼2.5 with 20% Naphthenic acid or 10% Versatic acid-10. And then, copper and zinc were extracted at pH 2 with 3% LIX 84 and at pH 2.5∼3 with 20% PC-88A respectively, remaining nickel in the raffinate. In this manner, the heavy metals in electroplating waste water could be effectively separated with solvent extraction method.
V. Kumar, B. D. Pandey and D. Bagchi, : 'Application of LlX 84 for Separation of Copper, Nickel and Cobalt in Ammoniacal Leaching of Ocean Nodules', Materials Trans., JIM, 32(2), p.157-163, (1991)
M. Pourbaix : Atlas of Electrochemical Equilibria in Aqueous Solutions, Pergamon Press, USA, p.387, (1974)
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