2015-Sustainable Industrial Processing Summit
SIPS 2015 Volume 11: Recycling & Environmental
| Editors: | Kongoli F, Havlik T, Pagnanelli F |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2015 |
| Pages: | 410 pages |
| ISBN: | 978-1-987820-34-8 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Use of Industrial Waste in the Manufacture of Red Ceramic
Leila Sousa1; Suzy Freitas1; Paulo Assis2;1UNIVERSIDADE FEDERAL DE OURO PRETO, Ouro Preto, Brazil; 2UFOP (FEDERAL UNIVERSITY OF OURO PRETO) / REDEMAT, Ouro Preto, Brazil;
Type of Paper: Regular
Id Paper: 423
Topic: 7
Abstract:
This paper presents preliminary results as the incorporation of waste iron ore and BOF slag, already stabilized, with free CaO contents of less than 3% in ceramic artifacts. The clay was chosen based on local availability and the wastes by their chemical and physical characteristics.
The bodies prepared for analysis contained the following contents: fine tailings (10, 20 and 25%) and slag (5, 10 and 25%), both in volume of clay. Materials in this order, the results for moisture were 2.15, 35 and 35.3%; real density 3.05, 2.85 and 2.55 g/cm3 and particle sizes less than 0.600 mm. The specimens were homogenized and formed in manual mechanical press with uniaxial pressure of 20MPa. Subsequently, they were weighed and dried at 110°C during 24 hours. Therefore, weighed and sintering in a muffle furnace at 950°C for 1 hour. After all, a visual and structural analysis in the Scanning Electron Microscope (SEM) was made. The results provided by SEM showed that the pressure of 20 MPa was not enough for the complete compression of the material, which in general, had an excess of voids between the grains. From the visual analysis, it was noticed that the burned time was not sufficient for complete sintering of the samples that comprised 25 to 50% of waste. Which can be explained by the silica content (8.44%) and iron oxide (32, 71 and 86.6%) respectively present in the slag and the fine tailings. Thus, in the function of the chemical and physical characteristics of each component used in this work, the data indicate that should be used compaction pressures greater than 20MPa and larger sintering time, for use of higher levels wastes in red ceramics.