Journal of Northeastern University Natural Science ›› 2017, Vol. 38 ›› Issue (1): 67-71.DOI: 10.12068/j.issn.1005-3026.2017.01.014

• Materials & Metallurgy • Previous Articles     Next Articles

Preparation of Chromium Oxide Product from Chromium Residue

TIAN Lei, ZHANG Ting-an, LIU Yan, LYU Guo-zhi   

  1. Key Laboratory for Ecological Utilization of Multimetallic Mineral, Ministry of Education, Northeastern University, Shenyang 110819, China.
  • Received:2015-09-13 Revised:2015-09-13 Online:2017-01-15 Published:2017-01-13
  • Contact: ZHANG Ting-an
  • About author:-
  • Supported by:
    -

Abstract: The harmless treatment of chromium hydroxide residue was studied. The effects of NaOH concentration, liquid to solid mass ratio, leaching temperature, stirring rate and holding time on the leaching rate of aluminum were investigated. The results show that the removal rate of aluminum from chromium residue can reach 92.69% when the temperature was 100℃, the NaOH concentration was 150g/L, the liquid to solid ratio was 7∶1, the stirring rate was 400 r/min and the holding time was 3.5h. After washing with water, the leaching residue was calcined at 950℃ for 90 min to produce chromium hemitrioxide, and its content reached 97.23%. The chromium hemitrioxide is green and suitable for industrial use according to the measurement with CIE L*a*b*colour space.

Key words: chromium hydroxide residue, harmless treatment, leaching residue, leaching rate of aluminum, chromium oxide content

CLC Number: