Stabilization of Chromium Waste by Solidification into Cement Composites
This article deals with the study of hazardous chromium leaching, stabilized/solidified by cement CEM II after 28 days of curing, in an acidic environment. The mortars subjected to this study were investigated by X-ray diffraction (XRD) characterization to evaluate the influence of chromium waste on...
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MDPI AG
2023-09-01
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| Online Access: | https://www.mdpi.com/1996-1944/16/18/6295 |
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| author | Cherif Belebchouche Salah-Eddine Bensebti Chaima Ould-Said Karim Moussaceb Slawomir Czarnecki Lukasz Sadowski |
| author_facet | Cherif Belebchouche Salah-Eddine Bensebti Chaima Ould-Said Karim Moussaceb Slawomir Czarnecki Lukasz Sadowski |
| author_sort | Cherif Belebchouche |
| collection | DOAJ |
| description | This article deals with the study of hazardous chromium leaching, stabilized/solidified by cement CEM II after 28 days of curing, in an acidic environment. The mortars subjected to this study were investigated by X-ray diffraction (XRD) characterization to evaluate the influence of chromium waste on their mineralogical structure. In the study range (0.6–1.2%), increasing the mass percentage of Cr<sub>2</sub>O<sub>3</sub> in the mortars indicates that chromium accelerates the hydration process and setting of the mortar and increases the mechanical strength of the mortars compared to the control sample. It was observed that the release of chromium during the Toxicity Characteristic Leaching Procedure (TCLP) test and the efficiency of the stabilization/solidification process depended on the initial Cr concentration and the leaching time. The use of XRD allowed the identification of new crystallized phases in the cement matrices, namely, CaCrO<sub>4</sub>·2H<sub>2</sub>O and chromium–ettringite Ca<sub>6</sub>Cr<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub>(OH)<sub>12</sub>·26H<sub>2</sub>O, which confirms the immobilization of chromium and the efficiency of the stabilization/solidification process. In this research, the release mechanism was found to be primarily a surface phenomenon by modeling the experimental data (dissolution or precipitation). |
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| id | doaj.art-2b73969fd94f4ea18d6a1d9ff679ea4c |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T22:30:49Z |
| publishDate | 2023-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-2b73969fd94f4ea18d6a1d9ff679ea4c2023-11-19T11:45:37ZengMDPI AGMaterials1996-19442023-09-011618629510.3390/ma16186295Stabilization of Chromium Waste by Solidification into Cement CompositesCherif Belebchouche0Salah-Eddine Bensebti1Chaima Ould-Said2Karim Moussaceb3Slawomir Czarnecki4Lukasz Sadowski5Department of Civil Engineering, Faculty of Sciences of Technology, Frères Mentouri Constantine 1 University, Constantine 25000, AlgeriaDepartment of Civil Engineering, Faculty of Sciences of Technology, Frères Mentouri Constantine 1 University, Constantine 25000, AlgeriaLaboratory of Biology and Physiology of Organisms (LBPO), Faculty of Biological Sciences, USTHB, BP 32 El-Alia, Bab Ezzouar 16111, AlgeriaLaboratory of Materials Technology and Process Engineering, Faculty of Technology, University of Bejaia, Bejaia 06000, AlgeriaDepartment of Materials Engineering and Construction Processes, Wroclaw University of Science and Technology, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, PolandDepartment of Materials Engineering and Construction Processes, Wroclaw University of Science and Technology, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, PolandThis article deals with the study of hazardous chromium leaching, stabilized/solidified by cement CEM II after 28 days of curing, in an acidic environment. The mortars subjected to this study were investigated by X-ray diffraction (XRD) characterization to evaluate the influence of chromium waste on their mineralogical structure. In the study range (0.6–1.2%), increasing the mass percentage of Cr<sub>2</sub>O<sub>3</sub> in the mortars indicates that chromium accelerates the hydration process and setting of the mortar and increases the mechanical strength of the mortars compared to the control sample. It was observed that the release of chromium during the Toxicity Characteristic Leaching Procedure (TCLP) test and the efficiency of the stabilization/solidification process depended on the initial Cr concentration and the leaching time. The use of XRD allowed the identification of new crystallized phases in the cement matrices, namely, CaCrO<sub>4</sub>·2H<sub>2</sub>O and chromium–ettringite Ca<sub>6</sub>Cr<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub>(OH)<sub>12</sub>·26H<sub>2</sub>O, which confirms the immobilization of chromium and the efficiency of the stabilization/solidification process. In this research, the release mechanism was found to be primarily a surface phenomenon by modeling the experimental data (dissolution or precipitation).https://www.mdpi.com/1996-1944/16/18/6295hazardous chromium wastesacidic environmentcementitious materialsleaching |
| spellingShingle | Cherif Belebchouche Salah-Eddine Bensebti Chaima Ould-Said Karim Moussaceb Slawomir Czarnecki Lukasz Sadowski Stabilization of Chromium Waste by Solidification into Cement Composites Materials hazardous chromium wastes acidic environment cementitious materials leaching |
| title | Stabilization of Chromium Waste by Solidification into Cement Composites |
| title_full | Stabilization of Chromium Waste by Solidification into Cement Composites |
| title_fullStr | Stabilization of Chromium Waste by Solidification into Cement Composites |
| title_full_unstemmed | Stabilization of Chromium Waste by Solidification into Cement Composites |
| title_short | Stabilization of Chromium Waste by Solidification into Cement Composites |
| title_sort | stabilization of chromium waste by solidification into cement composites |
| topic | hazardous chromium wastes acidic environment cementitious materials leaching |
| url | https://www.mdpi.com/1996-1944/16/18/6295 |
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