초록
$\alpha$-Etchent 부식액과 순수동액을 수소환원시킴으로 아래와 같은 결과를 얻었다. (1) 수소압 및 교반속도가 증가함에 따라 각각 300psi, 500rpm까지는 동의 회수율은 증가하다가 그 이상에서는 오히려 감소하였으나, 반응온도에는 거의 영향을 받지 않았다. 이때 동의 회수율은 순수동용액 및 $\alpha$-Etchent 용액에서 최대 각각 약 90% 및 60%이었다. 또한 모든 실험에 있어 순수동용액이 $\alpha$-Etchent 부식액에서 보다 약 30~40% 동의 회수율이 증가하였다. (2) 반응시간이 증가하면 약 30분까지는 동의 회수율이 증가하지만 그 이상에서는 거의 변화가 없었다. 이때 반응초기에는(30분까지) 침상형의 동분말이었지만 그 이상에서는 포도송이 모양의 noudle 형태로 성장되었고, 분말의 크기는 약 $2~3\mu\textrm{m}$이었다.
The recovery of copper from $\alpha$-Etchent waste and pure copper solution was studied by the $H_2$reduction process. The results of test were as following: 1) The recovery of copper was increased with increasing hydrogen pressure and stirring speed up to 300 psi and 500 rpm, respectively, and was decreased in the higher values. But the recovery of copper from the fresh copper solution and $\alpha$-Etchent solution reached 90% and 60%, respectively. And in all tests the copper recovery from pure copper solution is higher by 30~40% than that from $\alpha$Etchent solution. 2) The recovery of copper was increased up to 30 minute of reaction time, and after then it became constant. The copper particles prepared in the initial 30 min have the needle-like shapes and in the longer reaction time than 30 min the shape was changed into noudle-like form. The average particle size was about $2~3\mu\textrm{m}$.
