Synthesis of calcium aluminates from non-saline aluminum dross
The present work examines the synthesis of tricalcium aluminate (for use as a synthetic slag) from the non-saline dross produced in the manufacture of metallic aluminum in holding furnaces. Three types of input drosses were used with AlO contents ranging from 58 to 82 wt %. Calcium aluminates were f...
| Authors: | , , , , |
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| Format: | article |
| Status: | Published version |
| Publication Date: | 2019 |
| Country: | España |
| Institution: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repository: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/187764 |
| Online Access: | http://hdl.handle.net/10261/187764 |
| Access Level: | Open access |
| Keyword: | Aluminum Sintering Reactive milling Calcium aluminates Tricalcium aluminate Non-saline dross |
| Summary: | The present work examines the synthesis of tricalcium aluminate (for use as a synthetic slag) from the non-saline dross produced in the manufacture of metallic aluminum in holding furnaces. Three types of input drosses were used with AlO contents ranging from 58 to 82 wt %. Calcium aluminates were formed via the mechanical activation (reactive milling) of different mixtures of dross and calcium carbonate, sintering at 1300 °C. The variables affecting the process, especially the milling time and the AlO/CaO molar ratio, were studied. The final products were examined via X-Ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Raman spectroscopy. The reactive milling time used was 5 h in a ball mill, for a ball/dross mass ratio of 6.5. For a molar relationship of 1:3 (AlO/CaO), sintered products with calcium aluminate contents of over 90% were obtained, in which tricalcium aluminate (CA) was the majority compound (87%), followed by CA (5%). |
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