Advertisement

Journal of Central South University of Technology

, Volume 15, Issue 6, pp 824–829 | Cite as

Selective leaching of chromium-containing slag by HCl

  • Zhi-hui Yang (杨志辉)
  • Li-yuan Chai (柴立元)Email author
  • Yun-yan Wang (王云燕)
  • Kun Zhao (赵堃)
  • Yu-de Shu (舒余德)
Article

Abstract

A batch of column experiments was carried out to investigate the change of Cr(VI) concentration leached out from chromium-containing slag with HCl as leaching agent, and to study influences of pH, ratio of solid mass to solution volume, flow velocity and temperature on Cr(VI) leaching. The optimal parameters were obtained for Cr(VI) leaching and a fitting model was established to describe the procedure of Cr(VI) leaching. The results show that Cr(VI) concentration in leachate increases with decreasing pH and increasing flow velocity and temperature. Moreover, Cr(VI) leaching percentage increases with increasing ratio of solid mass to solution volume. The optimal parameters for Cr(VI) selective leaching are as follows: pH=3.0, 1:5 of ratio of solid mass to solution volume, 180 mL/min of flow velocity and 40 °C of temperature. The procedure of Cr(VI) leaching fits well with the model: v=1.87t−0.54, indicating that the leaching rate of Cr(VI) declines in an exponential order of −0.54.

Key words

chromium-containing slag Cr(VI) leaching leaching rate dynamic model 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. [1]
    CROSS H J, FAUX S P, SADHRA S, SORAHAN T, LEVY L S, AW T C, BRAITHWAITE R, MCROY C, HAMILTON L, CALVERT I A. Criteria document for hexavalent chromium [M]. Paris: International Chromium Development Association (ICDA), 1997.Google Scholar
  2. [2]
    GIBB H J, LEE P S, PINSKY P F. Lung cancer among workers in chromium chemical production [J]. American Journal of Industrial Medicine, 2000, 38(2): 115–126.CrossRefGoogle Scholar
  3. [3]
    YANG Yang. It is very serious of chromium salts waste slag pollution in China [J]. Chemical Industry Management, 2003 (1): 4–6. (in Chinese)Google Scholar
  4. [4]
    ZHU Ji. The two key factors for disposal of chrome residue [J]. Inorganic Chemicals Industry, 2004, 36(5): 1–4. (in Chinese)Google Scholar
  5. [5]
    CHAI Li-yuan, HE De-wen, YU Xia, LIU Hui, MIN Xiao-bo, CHEN Wei-liang. Technological progression detoxification and comprehensive utilization of chromium containing slag [J]. Trans Nonferrous Met Soc China, 2002, 12(3): 514–519.Google Scholar
  6. [6]
    ISLAM M Z, CATALAN L J J, YANFUL E K. Effect of remineralization on heavy-metal leaching from cement-stabilized/solidified waste [J]. Environmental Science and Technology, 2004, 38(5): 1561–1568.CrossRefGoogle Scholar
  7. [7]
    GEELHOED J S, MEEUSSEN J C L, ROE M J, HILLIER S, THOMAS R P, FARMER J G, PATERSON E. Chromium remediation or release? Effect of iron (II) sulfate addition on chromium(VI) leaching from columns of chromite ore processing residue [J]. Environmental Science and Technology, 2003, 37(14): 3206–3213.CrossRefGoogle Scholar
  8. [8]
    LONG Teng-fa, CHAI Li-yuan, ZHENG Su. Current application situation and development on detoxification of Cr(VI) by micro-organisms [J]. Safety and Environmental Engineering, 2004, 11(3): 22–25. (in Chinese)Google Scholar
  9. [9]
    MA Ze-min, ZHU Wen-jie, LONG Huai-zhong, CHAI Li-yuan, WANG Qing-wei. Chromate reduction by resting cells of Achromobacter sp. Ch-1 under aerobic conditions [J]. Process Biochemistry, 2007, 42(6): 1028–1032.CrossRefGoogle Scholar
  10. [10]
    CHAI Li-yuan, ZHAO Kun, SHU Yu-de, ZHU Wen-jie. Kinetics of chromium-containing slag leached by NaCl [J]. Journal of Central South University: Science and Technology, 2007, 38(3): 445–449. (in Chinese)Google Scholar
  11. [11]
    TINJUM J M, BENSON C H, EDIL T B. Mobilization of Cr(VI) from chromite ore processing residue through acid treatment [J]. Science of the Total Environment, 2008, 391(1): 13–25.CrossRefGoogle Scholar
  12. [12]
    JAMES B R. Hexavalent chromium solubility and reduction in alkaline solids enriched with chromite ore processing residue [J]. Journal of Environmental Quality, 1994, 23(2): 227–233.CrossRefGoogle Scholar
  13. [13]
    TINJUM J M. Mineralogical properties of chromium ore processing residue and chemical remediation strategies [D]. Wiscosin: University of Wisconsin-Madison, 2006.Google Scholar
  14. [14]
    Group of testing and monitoring analysis methods of harmful characteristics of industrial solid wastes. Testing and monitoring analysis methods of harmful characteristics of industrial solid wastes[M]. Beijing: China Environmental Science Press, 1986. (in Chinese)Google Scholar
  15. [15]
    WANG Ming-jie, WANG Su-fang. Study on methods of solid wastes sample collection and preparation [J]. Environmental Monitoring in China, 1993, 9(1): 1–8. (in Chinese)Google Scholar
  16. [16]
    PATTANAPIPITPAISAL P, BROWN N L, MACASKIE L E. Chromate reduction and 16S rRNA identification of bacteria isolated from a Cr(VI)-contaminated site [J]. Applied Microbiology and Biotechnology, 2001, 57(1/2): 257–261.Google Scholar

Copyright information

© Central South University Press and Springer-Verlag GmbH 2008

Authors and Affiliations

  • Zhi-hui Yang (杨志辉)
    • 1
  • Li-yuan Chai (柴立元)
    • 1
    Email author
  • Yun-yan Wang (王云燕)
    • 1
  • Kun Zhao (赵堃)
    • 1
  • Yu-de Shu (舒余德)
    • 1
  1. 1.School of Metallurgical Science and EngineeringCentral South UniversityChangshaChina

Personalised recommendations