Effects of Alkali on Water Soluble Hexavalent Chromium in Ordinary Portland Cement

Fan Shi, Dehong Jiang, Junrong Ji, Jinsheng Yan and Huxing Chen
Additional contact information
Fan Shi: School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
Dehong Jiang: Chongzuo South Cement Co., Ltd., Chongzuo 532200, China
Junrong Ji: Chongzuo South Cement Co., Ltd., Chongzuo 532200, China
Jinsheng Yan: Chongzuo South Cement Co., Ltd., Chongzuo 532200, China
Huxing Chen: School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China

IJERPH, 2022, vol. 19, issue 8, 1-12

Abstract: Due to the toxicity and mobility of chromium, the disposal of chromium-containing waste is a pressing issue. Co-processing of chromium-containing waste in a cement kiln is currently one of the most effective methods. However, the presence of water-soluble hexavalent chromium (Cr(VI)) in cement limits the use of this method. In this study, Na 2 CO 3 was used to simulate alkali in industrial raw materials to investigate the pattern of influence of alkali content on water-soluble hexavalent chromium. The mechanisms associated with the oxidation and dissolution of chromium were investigated using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and inductively coupled plasma emission spectrometry (ICP-OES). The proportion of Cr(VI) in the clinker detected by XPS increased rapidly with increasing alkali content. In the cement slurry system, alkali promotes more hexavalent chromium leaching by influencing pH and other ion concentrations (Ca 2+ , SO 4 2− ). Therefore, the addition of alkali to either the raw meal or to the cement slurry system will favour an increase in the water-soluble Cr(VI) content. This study may provide theoretical guidance for the preparation and use of clinkers containing chromium.

Keywords: alkali; clinker; water-soluble hexavalent chromium (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1660-4601/19/8/4811/pdf (application/pdf)
https://www.mdpi.com/1660-4601/19/8/4811/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jijerp:v:19:y:2022:i:8:p:4811-:d:794671

Access Statistics for this article

IJERPH is currently edited by Ms. Jenna Liu

More articles in IJERPH from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().