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Recovery of Nickel from Waste Iron-Nickel Alloy Etchant and Fabrication of Nickel Powder

에칭 폐액으로부터 용매추출과 가수분해를 이용한 니켈분말제조에 관한 연구

Lee, Seokhwan;Chae, Byungman;Lee, Sangwoo;Lee, Seunghwan
이석환;채병만;이상우;이승환

  • Received : 2018.10.08
  • Accepted : 2018.12.12
  • Published : 2019.03.30

Abstract

In general after the etching process, waste etching solution contains metals. (ex. Nickel (Ni), Chromium (Cr), Zinc (Zn), etc.) In this work, we proposed a recycling process for waste etching solution and refining from waste liquid contained nickel to make nickel metal nano powder. At first, the neutralization agent was experimentally selected through the hydrolysis of impurities such as iron by adjusting the pH. We selected sodium hydroxide solution as a neutralizing agent, and removed impurities such as iron by pH = 4. And then, metal ions (ex. Manganese (Mn) and Zinc (Zn), etc.) remain as impurities were refined by D2EHPA (Di-(2-ethylhexyl) phosphoric acid). The nickel powders were synthesized by liquid phase reduction method with hydrazine ($N_2H_4$) and sodium hydroxide (NaOH). The resulting nickel chloride solution and nickel metal powder has high purity ( > 99%). The purity of nickel chloride solution and nickel nano powders were measured by EDTA (ethylenediaminetetraacetic) titration method with ICP-OES (inductively coupled plasma optical emission spectrometer). FE-SEM (field emission scanning electron microscopy) was used to investigate the morphology, particle size and crystal structure of the nickel metal nano powder. The structural properties of the nickel nano powder were characterized by XRD (X-ray diffraction) and TEM (transmission electron microscopy).

Keywords

Iron (III) chloride;Recovery;Solvent extraction;Nano powder

References

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Acknowledgement

Supported by : 한국에너지기술평가원(KETEP)