Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Preparation of Copper Fine Particles from Waste Copper by Chemical Reduction Method

폐동분으로부터 화학환원법에 의한 Cu 미립자 제조

  • Kim, Yoon-Do (Department of Chemical and Biochemical Engineering, Konyang University) ;
  • Song, Ki Chang (Department of Chemical and Biochemical Engineering, Konyang University) ;
  • Song, Jong-Hyeok (Recytech Korea Co. Ltd., Annex Research Institute)
  • 김윤도 (건양대학교 화공생명학과) ;
  • 송기창 (건양대학교 화공생명학과) ;
  • 송종혁 ((주)리싸이텍코리아 부설연구소)
  • Received : 2007.07.24
  • Accepted : 2007.08.24
  • Published : 2007.12.31
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Abstract

Copper fine particles, ranging from $0.11{\mu}m$ to $0.64{\mu}m$ in average size, were prepared by a chemical reduction method using hydrazine ($N_2H_4$) 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 $Cu_2O$ 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 0.12 mol. 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.

화학환원법을 이용하여 폐동분 수용액에 환원제인 hydrazine을 첨가하여 $0.11{\sim}0.64{\mu}m$ 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 $Cu_2O$의 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.

Keywords

References

  1. Yu, Y. T. and Choi, Y. Y., 'Synthesis of Uniform Cu Particle by Hydrazine Reduction from Copper Sulfate Solution,' Korean J. Mater. Res., 13(8), 524-530(2003) https://doi.org/10.3740/MRSK.2003.13.8.524
  2. Park, Y. M., Jin, H. H., Kim, S. R., Park, H. C. and Yoon, S. Y., 'The Influence of Reaction Conditions on the Preparation of Ultra Fine Cu Powders with Wet-reduction Process,' Korean J. Mater. Res., 14(11), 790-794(2004) https://doi.org/10.3740/MRSK.2004.14.11.790
  3. Yoon, J. H., Kwon, H. W., Yu, Y. T., Kim, B. G. and Kim, G. S., 'Synthesis of Uniform Cu Particles from Copper Chloride Solution,' Korean J. Mater. Res., 15(4), 263-270(2005) https://doi.org/10.3740/MRSK.2005.15.4.263
  4. Seo, W. S., Kim, T. H., Sung, J. S. and Song, K. C., 'Synthesis of Silver Nanoparticles by Chemical Reduction Method,' Korean Chem. Eng. Res., 42(1), 78-83(2004)
  5. Seo, W. S., Kim, Y. D., Choung, I. Y., Lee, H. S. and Song, K. C., 'Synthesis of Ag-Pd Alloy Nanoparticles by Chemical Reduction Method,' Korean J. Ceramic Society, 43(4), 224-229(2006) https://doi.org/10.4191/KCERS.2006.43.4.224
  6. Ahn, J. G., Kim, D. J., Lee, I. K., Lee, J. R. and Liang, H. J., 'Synthesis of Fine Copper Powders from CuO-$H_{2}O$ Slurry by Wet-reduction Method,' J. Kor. Powder Metallurgy Institute, 12(3), 192-200(2005) https://doi.org/10.4150/KPMI.2005.12.3.192
  7. Goia, D. V. and Matijevic, E., 'Tailoring the Particle Size of Monodispersed Colloidal Gold,' Colloids and Surfaces A, 146, 139-152(1999) https://doi.org/10.1016/S0927-7757(98)00790-0
  8. Niu, H., Yang, Q. and Tang, K., 'A New Route to Copper Nitrate Hydroxide Microcrystals,' Mater. Sci. Engin. B, 135, 172-175(2006) https://doi.org/10.1016/j.mseb.2006.08.045