| Title |
Investigation of Preparation of Slag Wool from Melting-Separated Red Mud |
| ID_Doc |
15033 |
| Authors |
Du, PP; Zhang, YZ; Long, Y; Xing, L |
| Title |
Investigation of Preparation of Slag Wool from Melting-Separated Red Mud |
| Year |
2023 |
| Published |
Crystals, 13, 12 |
| DOI |
10.3390/cryst13121645 |
| Abstract |
The preparation of high-quality inorganic fibers by centrifugation from modified melting-separated red mud, which is the product of the efficient recovery of pig iron from red mud, is a new approach to achieve large-scale production of high value-added materials from red mud. This method has a wide range of application prospects and could contribute substantially to the comprehensive utilization of bulk industrial solid waste and the development of a circular economy. In this study, melting-separated red mud was modified with water-quenched blast furnace slag, quartz sand, and quicklime. The effect of the CaO/Na2O mass ratio on the viscosity, fluidity, and crystallization performance of the melting-separated red mud was investigated; slag wool was prepared by centrifugation under laboratory conditions; and the effect of the CaO/Na2O mass ratio on the morphology and properties of the slag wool was investigated. The viscosity of modified melting-separated red mud with different CaO/Na2O mass ratios shows a decreasing trend with increasing temperature, and the fluidity increases with increasing temperature, indicating that the melt fluidity is improved. The suitable fiber-forming temperature of the melting-separated red mud shows a trend of increasing-decreasing-increasing with an increasing CaO/Na2O mass ratio, and at a CaO/Na2O ratio of 3.0, the maximum suitable fiber-forming temperature is 81 degrees C. Considering the feasibility of slag wool preparation from modified melting-separated red mud, the CaO/Na2O of the modified raw material system should not be higher than 3.0. The crystallization temperature of modified melting-separated red mud with different CaO/Na2O mass ratios first increases and then decreases, with a peak of 1450 degrees C at a CaO/Na2O ratio of 4.0. Slag wool prepared from modified melting-separated red mud with different CaO/Na2O mass ratios exhibits good properties, with a diameter of 5.47-6.67 mu m and a slag ball content of 2.7-8.4%. |
| Author Keywords |
melting-separated red mud; slag wool; CaO/Na2O mass ratio; modification; centrifugal fiber formation |
| Index Keywords |
Index Keywords |
| Document Type |
Other |
| Open Access |
Open Access |
| Source |
Science Citation Index Expanded (SCI-EXPANDED) |
| EID |
WOS:001135999800001 |
| WoS Category |
Crystallography; Materials Science, Multidisciplinary |
| Research Area |
Crystallography; Materials Science |
| PDF |
https://www.mdpi.com/2073-4352/13/12/1645/pdf?version=1701184362
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