Green ceramsite production via calcination of chromium contaminated soil and the toxic Cr(VI) immobilization mechanisms

煅烧 浸出(土壤学) 化学 污染 冶金 材料科学 环境化学 核化学 化学工程 土壤水分 催化作用 环境科学 土壤科学 有机化学 工程类 生物 生态学
作者
Chuanhe Fan,Jueshi Qian,Yun Yang,Huaqiang Sun,Jipeng Song,Yingru Fan
出处
期刊:Journal of Cleaner Production [Elsevier]
卷期号:315: 128204-128204 被引量:41
标识
DOI:10.1016/j.jclepro.2021.128204
摘要

Chromium contaminated soil (CCS) is challenging to be disposed because of the high toxicity and mobility of Cr(VI). This paper proposed a way to dispose CCS through calcining ceramsite. Three CCSes and an ordinary soil were selected, and a suitable calcination temperature was determined according to the properties of ceramsite. The stability of Cr(VI) immobilization in ceramsite was investigated and the Cr(VI) immobilization mechanism was analyzed through XRF, XPS, XRD, and BSE. Results showed that all three CCSes could be used to manufacture ceramsite when the calcination temperature was higher than 1100 °C, and the optimal calcination temperature was 1180 °C. The Cr(VI) leaching concentration of ceramsite was much lower than that specified in standard. It was also observed that the calcination temperature should be higher than 1000 °C to ensure the immobilization of Cr(VI). Otherwise, the Cr(VI) leaching concentration would be much higher than that of the original CCS. The Cr(VI) immobilization mechanism of ceramsite was contributed to the transformation of Cr(VI) to Cr(III) and the formation of chromium-bearing mineral, (Mg,Fe)(Cr,Al)2O4, as long as the calcining temperature was higher than 1100 °C. This work found that use of CCS in manufacturing ceramsite is a safe way of CCS utilization, but the calcination temperature should be carefully determined. All the results could be potentially referred for the safe and valuable utilization of waste soil.
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