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Study on the immobilisation mechanism of chromium under microwave sintering

Jian, S; Zhou, Q; Bai, Y; (2016) Study on the immobilisation mechanism of chromium under microwave sintering. In: Proceedings of the 36th Cement and Concrete Science Conference. The Institute of Materials, Minerals and Mining (IOM3): Cardiff, UK. Green open access

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Abstract

Chromium (Cr) salts have been widely used in various industries and the discharged waste has caused soil contamination. Among them, Cr(VI) is the main concern due to its high solubility and strong carcinogenic properties. This paper compares the performance of a novel microwave sintering technique with the conventional sintering technique for immobilising Cr contaminated soil. The most significant advantage of the microwave sintering is that it can provide controlled atmosphere (such as reduction atmosphere), which means Cr(Vl) can be reduced to less hazardous Cr(III) during the sintering process. The potential secondary contamination can, thus, be significantly reduced. The XRD results show that with microwave sintering, stronger and sharper peaks were observed, indicating minerals with higher crystallinity have been formed. On the other hand, the SEM results reveal that with conventional electric sintering, the microstructure was dominated by glassy phases, whilst a mixture of glassy and crystalline phases has been identified with microwave sintering. The leaching results show that the contaminated soil processed with microwave has met both British and Chinese leaching standards, and is better than that from the electric sintering technique.

Type: Proceedings paper
Title: Study on the immobilisation mechanism of chromium under microwave sintering
Event: 36th Cement and Concrete Science Conference
Location: Cardiff, UK
Dates: 05 September 2016 - 06 September 2016
Open access status: An open access version is available from UCL Discovery
Publisher version: http://www.iom3.org/
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Chromium contaminated soil, Conventional sintering, Microwave sintering
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng
URI: https://discovery.ucl.ac.uk/id/eprint/1523321
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