電氣分解法을 利用한 無電解 니켈 鍍金廢液으로부터 니켈 回收
Recovery of Nickel from Electroless Plating Wastewater by Electrolysis Method
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초록
전해채취법을 이용하여 무전해 니켈 도금폐액으로부터 니켈을 회수하기 위한 실험을 수행하였다. 이를 위해 우선 가성소다를 첨가하는 방법으로 무전해 니켈 도금폐액중의 니켈을 수산화물 형태로 침전분리하였다. 또한, 니켈 수산화물을 황산 용액으로 용해시킨 니켈 수용액을 대상으로 전기분해를 실시하였다. 실험결과, 가성소다를 첨가하여 pH 10 이상으로 조절하면 99% 이상의 Ni을 수산화물로 침전시킬 수 있는 것으로 나타났다. 한편, 니켈 수용액으로부터 전해채취를 통한 Ni의 석출시 전류밀도가 증가할수록 전류효율은 감소하는 것으로 나타났다.
Abstract
An investigation on the recovery of nickel from spent electroless plating solutions has been performed using the electrowinning method. For this aim, nickel in spent electroless plating solutions was separated as nickel hydroxide through the addition of caustic soda. Nickel hydroxide was completely dissolved with sulfuric acid and an electrolysis was performed for electrowinning of nickel from nickel solutions. As a result, it was found that more than 99% of nickel in spent electroless plating solutions could be precipitated as nickel hydroxide above pH 10 with the addition of caustic soda. As far as the current efficiency in electrowinning of nickel was concerned, it was decreased with increase in the current density.
참고문헌 (12)
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