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Received July 24, 2007
Accepted August 24, 2007
Available online December 26, 2007
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폐동분으로부터 화학환원법에 의한 Cu 미립자 제조
Preparation of Copper Fine Particles from Waste Copper by Chemical Reduction Method
건양대학교 화공생명학과, 320-711 충남 논산시 내동 26 1(주)리싸이텍코리아 부설연구소, 330-872 충남 천안시 동면 화덕리 106-1
Department of Chemical and Biochemical Engineering, Konyang University, 26, Nae-dong, Nonsan, Chungnam 320-711, Korea 1Annex Research Institute, Recytech Korea Co. Ltd., 106-1, Hwaduok-ri, Dong-myun, Cheonan, Chungnam 330-872, Korea
Korean Chemical Engineering Research, December 2007, 45(6), 560-565(6)
https://doi.org/NONE
https://doi.org/NONE
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Abstract
화학환원법을 이용하여 폐동분 수용액에 환원제인 hydrazine을 첨가하여 0.11~0.64 μm 크기의 Cu 미립자를 제조하였으며, 이 과정 중 hydrazine의 첨가량이 얻어진 분말의 물성에 미치는 영향을 살펴보았다. 또한 분말합성 과정 중 분산제인 polyvinyl alcohol(PVA) 또는 polyvinyl pyrrolidone(PVP) 첨가가 분말의 물성에 미치는 영향도 조사하였다. 1 M 농도의 폐동분 수용액에 hydrazine이 0.8 mol, 1.0 mol 첨가된 경우에는 Cu와 Cu2O의 혼합물을 나타내어 순수한 Cu 분말을 생성하지 못했다. 반면 적당량의 hydrazine(1.2 mol)이 첨가된 경우에는 순수한 Cu 분말이 생성되었다. 또한 얻어진 Cu 분말의 평균크기는 hydrazine과 분산제의 첨가량이 증가함에 따라 감소하였다. 한편 분말의 응집을 억제하는 분산제로서 PVA의 사용이 PVP 보다 더욱 효과적이었다.
Copper fine particles, ranging from 0.11 μm to 0.64 μm in average size, were prepared by a chemical reduction method using hydrazine (N2H4) as a reduction agent in waste copper solutions. The effect of the amount of hydrazine addition was investigated on the properties of the obtained powders. Also, the effect of the addition of dispersing agents [Polyvinyl alcohol (PVA), polyvinyl pyrrolidone (PVP)] during particle synthesis was studied. The powders, obtained from 1 M waste copper solutions, showed the mixtures of Cu and Cu2O crystals at low hydrazine addition amounts of 0.8 mol and 1.0 mol, while those exhibited pure Cu crystals at adequate hydrazine addition amount of 0.12mol. The average size of the Cu powders decreased with increasing the concentrations of hydrazine and dispersing agents. The addition of PVA to the solutions as a dispersing agent was more effective than that of PVP in preventing the aggregation of particles.
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