Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Leaching Properties of Water-Soluble Hexavalent Chromium by Manufacturing Condition of Cement Clinker

클링커 제조 조건에 따른 수용성 6가 크롬 용출 특성

  • Lee, Jong-Kyu (Green Ceramics Division, Korea Institute of Ceramic Eng. & Tech.) ;
  • Chu, Yong-Sik (Green Ceramics Division, Korea Institute of Ceramic Eng. & Tech.) ;
  • Song, Hun (Green Ceramics Division, Korea Institute of Ceramic Eng. & Tech.)
  • 이종규 (한국세라믹기술원 그린세라믹본부) ;
  • 추용식 (한국세라믹기술원 그린세라믹본부) ;
  • 송훈 (한국세라믹기술원 그린세라믹본부)
  • Received : 2011.10.19
  • Accepted : 2011.11.29
  • Published : 2011.12.27
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Abstract

One of the trace constituents included in cement clinker, chromium, has become prominent and highly noticed lately as a social issue both inside and outside of this country because it affects the human body negatively. The purpose of the present study was to investigate leaching properties of water-soluble hexavalent chromium by different manufacturing conditions of cement clinker. Raw materials were prepared to add different $SiO_2$, $Al_2O_3$ and $Fe_2O_3$ sources. After the raw materials, such as limestone, sand and clay, iron ore was pulverized and mixed, and the raw meal was burnt at $1450^{\circ}C$ in a furnace with an oxidizing atmosphere. Leaching of soluble hexavalent chromium showed a tendency to decrease with an increasing LSF and IM. However, leaching of soluble hexavalent chromium increased with an increasing S.M. Alkali contents of iron source minerals is closely related to the leaching properties of soluble hexavalent chromium. Green sludge has the highest content of alkali added; leaching of water-soluble hexavalent chromium was mostly high. In order to reduce the water-soluble hexavalent chromium in cement, reducing the alkali content in raw materials is important.

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References

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