RESEARCH ON WET DETOXIFICATION TECHNOLOGY OF CHROMITE ORE PROCESSING RESIDUE

CHEN Yao-jun; LI Lai-shun; LV Zheng-yong; MIN Yu-tao

doi:10.13205/j.hjgc.202006011

Volume 38 Issue 6

Aug. 2020

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CHEN Yao-jun, LI Lai-shun, LV Zheng-yong, MIN Yu-tao. RESEARCH ON WET DETOXIFICATION TECHNOLOGY OF CHROMITE ORE PROCESSING RESIDUE[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(6): 67-74. doi: 10.13205/j.hjgc.202006011

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CHEN Yao-jun, LI Lai-shun, LV Zheng-yong, MIN Yu-tao. RESEARCH ON WET DETOXIFICATION TECHNOLOGY OF CHROMITE ORE PROCESSING RESIDUE[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(6): 67-74. doi: 10.13205/j.hjgc.202006011

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RESEARCH ON WET DETOXIFICATION TECHNOLOGY OF CHROMITE ORE PROCESSING RESIDUE

doi: 10.13205/j.hjgc.202006011

Beijing GeoEnviron Engineering & Technology, Inc., Beijing 100089, China

Received Date: 2020-03-28

Abstract

Abstract

Aiming at the treatment of Cr(Ⅵ) pollution in chromite ore processing residue (COPR), a wet detoxification process of COPR with sulfuric acid leaching and ferrous sulfate reduction was proposed in this paper. Based on the characterization of the surface morphologies of COPR before and after remediation, the treatment effect and remediation mechanism of Cr(Ⅵ) under different treatment conditions were investigated. The results showed that when the wet ball milling time of COPR was 20 min, 98.68% of the chromium slag particles passed through a 200 mesh sieve, and the leaching rate of water soluble Cr(Ⅵ) reached 40.96%. When the slag sulfuric acid was added at 60%, the liquid-solid ratio was 4∶1, and the acid dissolution time was 2.5 h, the leaching of Cr(Ⅵ) tended to be saturated. At this time, the pH of endpoint was 5.8, and the total leaching rate of Cr(Ⅵ) was 95.38%. When the ferrous sulfate was added at 40%, the content of Cr(Ⅵ) decreased to 1.38 mg/kg. The removal of Cr (Ⅵ) in COPR was mainly related to the dissolution of Cr(Ⅵ)-containing minerals by sulfuric acid, the ion exchange of SO₄^2- and CrO₄^2-, and the reduction of Cr(Ⅵ) in solution by Fe(Ⅱ).
- chromite ore processing residue,
- acid solution,
- reduction,
- leaching rate,
- Cr(Ⅵ) treatment

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References(34)

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