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Double-Barrier mechanism for chromium immobilization: A quantitative study of crystallization and leachability

文献类型： 外文期刊

作者： Liao, Changzhong 1 ; Tang, Yuanyuan 3 ; Liu, Chengshuai 1 ; Shih, Kaimin 2 ; Li, Fangbai 1 ;

作者机构： 1.Guangdong Inst Ecoenvironm & Soil Sci, Guangdong Key Lab Agr Environm Pollut Integrated, Guangzhou 510650, Guangdong, Peoples R China

2.Univ Hong Kong, Dept Civil Engn, Pokfulam Rd, Hong Kong, Hong Kong, Peoples R China

3.South Univ Sci & Technol China, Sch Environm Sci & Engn, Shenzhen 518055, Peoples R China

4.Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550009, Peoples R China

关键词： Glass-ceramic;Spinel;Chromium immobilization;Rietveld quantitative XRD;Leaching performance

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：10.588； 五年影响因子：10.129 ）

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收录情况： SCI

摘要： Glass-ceramics are well known for the excellent combination properties provided by their components, a glassy matrix and crystalline phases, and have promising applications in the immobilization and detoxification of solid waste containing toxic metals. Glass-ceramic products were successfully synthesized in CaO-MgO-SiO2-Al2O3 -Cr2O3 system. Two key measures - partitioning ratio of Cr in the spinel and Cr leaching ratio - were used to investigate the mechanism of Cr immobilization in the glass-ceramic products. The results of powder X-ray diffraction revealed that both spinel and diopside were major crystalline phases in the products. The value of x in the MgCrxAl2-xO4 spinel was highly related to the amount of Cr2O3 added to the glass-ceramic system. As Cr2O3 content increased, the proportion of spinel phase increased, while that of glass phase decreased. The partitioning ratio of Cr in spinel phase was about 70% for 2 wt.% Cr2O3, and increased to 90% when loaded with 10 wt.% of Cr2O3. According to the results of the prolonged toxicity characteristic leaching procedure, the Cr leaching ratio decreased with the increase of Cr partitioning ratio into the spinel phase. The findings of this study clearly indicate that glass-ceramic formed by spinel structure and residual glass successfully immobilized Cr. (C) 2016 Elsevier B.V. All rights reserved.

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[1]Detoxification and immobilization of chromite ore processing residue in spinel-based glass-ceramic. Liao, Chang-Zhong,Liu, Chengshuai,Li, Fangbai,Liao, Chang-Zhong,Shih, Kaimin,Tang, Yuanyuan,Liu, Chengshuai,Lee, Po-Heng.

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