Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Heavy Metal Leaching Characteristics of Silicate Glass Containing EAF Dust

전기로 제강분진이 첨가된 규산염계 유리의 중금속 용출 특성

  • Kim, Hwan-Sik (Department of Materials Engineering, Kyonggi University) ;
  • Kang, Seung-Gu (Department of Materials Engineering, Kyonggi University) ;
  • Kim, Yoo-Taek (Department of Materials Engineering, Kyonggi University) ;
  • Lee, Gi-Gang (Department of Materials Engineering, Kyonggi University) ;
  • Kim, Jung-Hwan (Department of Materials Engineering, Kyonggi University)
  • 김환식 (경기대학교 첨단산업공학부 신소재공학과) ;
  • 강승구 (경기대학교 첨단산업공학부 신소재공학과) ;
  • 김유택 (경기대학교 첨단산업공학부 신소재공학과) ;
  • 이기강 (경기대학교 첨단산업공학부 신소재공학과) ;
  • 김정환 (경기대학교 첨단산업공학부 신소재공학과)
  • Published : 2006.02.01
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Abstract

The stabilizing behavior of heavy metals in the silicate glass containing Electric Arc Furnace dust (EAF dust) were studied by the Toxic Characterization Leaching Procedure (TCLP) test, and the change of crystalline phase and glass network structure were investigated as a function of EAF dust content added. The glass containing EAF dust of $30\;wt\%$ an oxygen/network former ratio(R) of $2\~3$ allowing a fairly stable network structure thus showed much lower heavy metal leaching concentration than that for containing EAF dust above $50\;wt\%$ at TCLP test. For the glass containing EAF dust $50\~60\;wt\%$, however, the R was over 3, which weakened the glass network structure and increased the heavy metals leachate. Adding the EAF dust to a glass decreased the degree of Si-O-Si symmetry and increased the number of non-bridging oxygen, which decreased the chemical durability of glasses. When the dust content in a glass was over $70\;wt\%$, the Zn and Fe ions reacted to form the spinel crystal rather than to bind to network structure of glass and leaching concentration of those ions from the specimen decreased, so the spinel phase could be attributed to lowering a heavy metal leaching.

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References

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