Citation: Mo Xiaofeng, Zhou Jin, Lin Le, Zhong Zuqi, Yang Shaohua, Liu Xueming, Shi Zhenqing, Zhao Dongye, Lin Zhang. Extraction of Cr(VI) from chromite ore processing residue via hydrothermal-assisted phase transformation[J]. Chinese Chemical Letters, ;2020, 31(7): 1956-1960. doi: 10.1016/j.cclet.2019.11.040 shu

Extraction of Cr(VI) from chromite ore processing residue via hydrothermal-assisted phase transformation

Mo Xiaofeng ^a ,
Zhou Jin ^a ,
Lin Le ^a ,
Zhong Zuqi ^a ,
Yang Shaohua ^a ,
Liu Xueming ^a,b,*, ,
Shi Zhenqing ^a ,
Zhao Dongye ^c ,
Lin Zhang ^a,b

a.
The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters(Ministry of Education), School of Environment and Energy, South China University of Technology, Guangzhou 510006, China
b.
Sino-Singapore International Joint Research Institute, Sino-Singapore Guangzhou Knowledge City, Guangzhou 510006, China
c.
Environmental Engineering Program, Department of Civil Engineering, Auburn University, Auburn AL 36849, United States

esliuxm@scut.edu.cn

Received Date: 8 October 2019
Revised Date: 3 November 2019
Accepted Date: 25 November 2019
Available Online: 26 November 2019

Figures(6)

The effective extracting Cr(VI) from chromite ore processing residue (COPR) is the key to achieve COPR detoxification and recovery. We developed an effective method to extract Cr(VI) from COPR via controlling the phase transformation of Cr(VI)-containing minerals. Characteristic analysis showed that Cr(VI) was mainly incorporated in the hydrocalumite (NaCa₄Al₂O₆(SO₄/CrO₄)_1.5·15H₂O) in COPR, which was a layered-double hydroxide (LDH) with multilayer structure. In the hydrothermal treatment experiments, the Na₂CO₃ solution showed significant extraction effect of Cr(VI) and detoxification effect of COPR. After treatment, 95% of Cr(VI) was removed and the Cr(VI) concentration in the leachate was decreased to 1.6 mg/L by the toxicity characteristic leaching procedure (TCLP), within the regulatory limit disposal standard (HJ/T 301-2007, 3 mg/L). Further study revealed that, during the treatment, hydrocalumite transformed into calcite (CaCO₃) under the effect of mineralizer, therefore, the layered structure collapsed and the incorporated Cr(VI) was released to the supernatant. Meanwhile, the Cr(VI) desorbed from calcite with the calcite particles grew into large size with smooth surface. Stir-flow experiment revealed that the amount of chromium released from CORP to the environment was significantly reduced after treatment, and it is safer for landfill disposal. This work will provide an instructive guidance for the detoxification and recovery of COPR.
- Chromite ore processing residue,
- Hexavalent chromium extraction,
- Hydrothermal mineralization,
- Phase transformation
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