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2011-Sustainable Industrial Processing Summit
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| Editors: | Florian K |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2012 |
| Pages: | 754 pages |
| ISBN: | 978-0-9879917-3-7 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
The Preparation Of Steel-slag Based Ceramic Materials And The Analysis Of Its Characterization
Hao Bai1;1UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING, SCHO, Beijing, China;
Type of Paper: Regular
Id Paper: 371
Topic: 12
Abstract:
Steel slag is main by-product in steel making process, and how to utilize it as resource has been an urgent issue for metallurgy industry. Until now, large-scale utilization of steel slag is not realized, since the limitation of its quality for potential application. China is the largest producer of crude steel, with the result that production of steel slag is also massive. Thus, development of high efficient and high value-added technology of steel slag utilization in China is of great significance for growth of recycling economy and increasing availability of resources in metallurgical industry.The converter slag was chosen as raw material with several other clay materials, and formulas of CaO-A12O3-SiO2 system and CaO-MgO-SiO2 system were designed. Steel slag based ceramic material of stable properties was processed successfully. The ceramic material of CaO-MgO-SiO2 system has a better performance, and the highest bending strength of the samples was up to 99.84MPa. The microstructure of these ceramic samples was analyzed by SEM, EPMA and XRD. It is found that the crystal phase composition of the samples which were made from the same formula system was similar. For CaO-A12O3-SiO2 system, the main phases of the samples include quartz, anorthite and pyroxene. While for CaO-MgO-SiO2 system, the main phases are diopside and diopside ferroan when the steel slag addition amount reaches 40% (mass percent)， however，the main phases are akermanite and enstatite when the steel slag addition amount is over 65% (mass percent). In addition, since the diopside was observed as short-column-like or needle-like structure, it is assumed to act as the frame of the ceramic material, which may contribute to the high bending strength tested. The results of this study indicate that the idea of making ceramics from steel slag provides a new technical route for the utilization of steel slag as resource, and the processing method can be a promising technology for future high value-added utilization of steel slag.