Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
권호 표지
DOI QR코드

DOI QR Code

Stabilization Behavior of Heavy Metals in the EAF Dust-clay Body Mixtures at Various Sintering Conditions

점토계소지내에서 전기로 더스트 중금속의 소성 온도별 안정화거동

  • Kwon, Yong-Joon (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, Young-Jin (Department of Materials Engineering, Kyonggi University) ;
  • Kang, Seung-Gu (Department of Materials Engineering, Kyonggi University) ;
  • Kim, Jung-Hwan (Department of Materials Engineering, Kyonggi University)
  • Published : 2002.01.01
Download PDF
⟨ Previous Next ⟩

Abstract

Stabilization behavior of Cr, Cd, Cu, Pb, Fe and Zn heavy metals in the EAF dust was investigated by adding EAF dust to clay or white clay, respectively, up to 50 wt% with 10 wt% intervals and sintering at temperatures between 200 and $1200^{\circ}C$ with $200^{\circ}C$ intervals with an aid of ICP-AES followed by TCLP test to evaluate heavy metal cation exchange capacity of the clay or the white clay. The clay or the white clay had a better Cr ion exchange capacity than that of zeolite. The TCLP leaching test for the sintered specimens showed that Cr and Fe were rarely detected for all the specimens and the concentration of Cd and Zn decreased with increasing sintering temperature and decreasing EAF dust contents respectively. When the clay or the white clay were mixed with EAF dust, cation exchange may occur between the clay and the EAF dust so that the first stabilization of the mixtures containing semistabilized heavy metals may happen. Stabilization of heavy metals in the ceramic bodies was further completed probably due to the eutectic reaction caused by the sintering of semi-stabilized mixtures. It was conceivable that the white clay rather than the clay may be a better stabilizer for the EAF dust containing heavy metals.

전기로 더스트를 점토 또는 백토와 혼합하여 소성온도에 따른 전기로 더스트 내에 존재하는 Cr, Cd, Cu, Pb, Fe, Zn 중금속들의 거동을 조사하였다. 전기로 더스트를 점토와 백토에 각각 0∼50 wt%씩 첨가하였고, 소성은 $200^{\circ}C$ 간격으로 $200∼1200^{\circ}C$ 범위 내에서 수행하였다. 소성된 시편은 TCLP법에 의한 용출실험을 거친 후 ICP-AES로 분석하였다. 중금속표준용액을 이용한 양이온 교환능 실험결과 점토와 백토가 기존의 중금속 흡착제인 제올라이트와 비슷한 중금속 양이온 교환능을 보였으며, Cr에 대해서는 더 우수한 교환능이 관찰되었다. TCLP법에 의한 용출실험 결과 Cr과 Fe는 모든 시편에서 거의 용출되지 않았으며, Cd과 Zn은 소성온도가 증가하고 전기로 더스트의 함량이 적을수록 용출량이 감소하였다. 점토 또는 백토와 전기로 더스트를 혼합 소성 시 일차적으로 양이온 교환능에 의해 중금속이 준안정화되고 이차적으로 공융반응에 의하여 중금속들이 완전하게 고정화되어 중금속 용출을 억제하는 것으로 추정된다. 본 연구에서 백토가 점토 보다는 전기로 더스트 중금속의 안정화에 더 효과적이었다.

Keywords

References

  1. C-K. Park, B-K. Kim and K-H. Cho, 'Utilization of Indus-trial By-products and Wastes for Manufacturing Hauyne Clinker and Properties of its Cement,' J. Kor. Solid Wastes Eng. Soc., 15 [3] 191-95 (1998)
  2. J-O. Hong, S-G. Kang, K-K. Lee, Y-T. Kim, Y-J. Kim, J-H. Kim and M-S. Park, 'Characteristics of Sintered Bodies Made from the System of Paper Sludge Ash-fly Ash-clay,' J. Kor. Ceram. Soc., 38 [10] 908-13 (2001)
  3. Y-J. Kwon, Y-T. Kim, K-G. Lee, Y-J. Kim, S-G. Kang, J-H. Kim and M-S. Park, 'Lightweight Aggregate Bloating Me-chanism of Clay/Incinerated Ash/Additive System,' J. Kor. Ceram. Soc., 38 [9] 811-16 (2001)
  4. S-W. Bae, S-Y. Han, B-J. Lee and Y-B. Kwon, 'Charac-teristics of Cement Based Solidification Process for Munic-ipal Solid Waste Incineration Plant Fly Ash,' J. Kor. Solid Wastes Eng. Soc., 16 [1] 67-72 (1999)
  5. B-C. Ban, I-G. Chon and Y-S. Koo, 'Melting Behavior of EAF-Dust in the Electric Arc Furnace,' J. Kor. Solid Wastes Eng. Soc., 16 [3] 253-62 (1999)
  6. B-J. Jung and S-M. Bae, 'A Study on Behavior of Volatile Compounds by Carbon Materials in Initial Reduction Stage of EAF Dust,' J. Kor. Solid Wastes Eng. Soc., 18 [2] 121-28 (2001)
  7. B-J. Lee and Y-B. Kwon, 'Characteristics of Cement Based Solidification of Hazardous Wastes,' J. Kor. Solid Wastes Eng. Soc., 18 [6] 22-30 (2001)
  8. J-K. Kim, E-H. Kim, S-H. Wang, N-C. S and S-S. Kim, 'A Study on the Problem and Modification of Industrial Wastes Extraction Procedure,' J. Kor. Solid Wastes Eng. Soc., 13[6] 775-82 (1996)
  9. J-O. Jung and J-H. Lee, 'A Comparative Evaluation of Korean Leaching Test with TCLP,' J. Kor. Solid Wastes Eng. Soc., 15 [7] 721-28 (1998)
  10. B-C. Chiang, M-Y. Wey and S-M. Huang, 'Heat Treatment of Incinerator Retired Sorbents Containing Heavy Metals,' The Sci. Tot. Env., 273 83-92 (2001) https://doi.org/10.1016/S0048-9697(00)00845-7
  11. J-S. Yun, H-C. Yang, M-J. Kang, J-H. Kim and Y. Kang, 'Study on High-temperature Capture of Vapor-phase Heavy Metal by Kaolin,' J. of the Kor. Instit. Chem. Eng., 39 [4] 470-76 (2001)
  12. S. A. Mikhail, A. M. Turcotte and J. Aota, 'Thermoan-alytical Study of EAF Dust and its Vitrification Product,' Thermochimica Acta, 287 71-9 (1996) https://doi.org/10.1016/0040-6031(96)02990-5
  13. M-S. Kim, W-T. Kwon and K-S. Jeon, 'Cation Exchange Properties of Synthetic Zeolite a from Kaolin,' J. Kor. Instit. Chem. Eng., 25 [6] 570-77 (1987)
  14. G. Y and Y-W. Kim, 'Adsorption Effects of Zeolite for Treatment of Heavy Metals in Wastewater(I),' J. KSWPRC Dec, 15-22 (1989)
  15. W. Namkoong, P. Hoc and C-S. Kim, 'Leaching Char-acteristics of Industrial Wastes,' J. Kor. Solid Wastes Eng. Soc., 13 [2] 186-92 (1996)
  16. Z. Youcai, S. Lijie and L Guajian, 'Chemical Stabilization of MSW Incinerator Fly Ashs,' J. Hazardous Mat., 2815 1-17 (2002)