| Title |
Effect of Annealing Temperature of Brownish-Red Pigment Based on Iron Oxide Extracted by Hydrothermal Route from Mill-Scale Steel Slag |
| ID_Doc |
6557 |
| Authors |
Eticha, ZG; Rojas-Hernandez, RE; Olu, FE; Yimam, A; Hussainova, I; Alemayehu, E |
| Title |
Effect of Annealing Temperature of Brownish-Red Pigment Based on Iron Oxide Extracted by Hydrothermal Route from Mill-Scale Steel Slag |
| Year |
2022 |
| Published |
Journal Of Sustainable Metallurgy, 8, 1 |
| DOI |
10.1007/s40831-021-00470-z |
| Abstract |
Materials based on iron oxide are still the most widely used red pigments. Although the synthetic iron oxide pigment industry has matured, there have been continuous efforts for more circular economy-based methods for the production of pigments. In this study, hematite has been extracted by a hydrothermal method from mill-scale steel slag and the brown-red pigment has been prepared. The extraction was done using sulfuric acid as a leaching agent; the addition of hydrogen peroxide favors the transformation of Fe2+ into Fe3+. The total conversion in the process was tested using potassium dichromate. The pH was stabilized by ammonia, in the process, the brown precipitate was formed in the solution, then the precipitate was filtered using Whatman filter paper and dried to be a powder. The extracted powder was annealed in an air atmosphere at temperatures ranging from 700 to 1000 degrees C. XRD, SEM with EDS, UV-VIS-NIR, and CIE-L*a*b* were used for examining the annealing temperature effect on the coloring property of the extracted powder pigment. The results show that by adjusting the annealing temperature, a color chart ranging from brown to red can be obtained, which means, an increase in temperature causes the change in particle size and this change influenced the pigment to be changed from a light-red-brown to a dark brown. In the end, the findings presented in this study provide new pathways for the global supply of red pigment using the circular economy approach. |
| Author Keywords |
Steel slag; The extraction process; Pigment synthesis; Hydrothermal method; Dark brown color |
| Index Keywords |
Index Keywords |
| Document Type |
Other |
| Open Access |
Open Access |
| Source |
Science Citation Index Expanded (SCI-EXPANDED) |
| EID |
WOS:000741954800001 |
| WoS Category |
Green & Sustainable Science & Technology; Metallurgy & Metallurgical Engineering |
| Research Area |
Science & Technology - Other Topics; Metallurgy & Metallurgical Engineering |
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