2017-Sustainable Industrial Processing Summit
SIPS 2017 Volume 5. Marquis Intl. Symp. / New and Advanced Materials and Technologies
| Editors: | Kongoli F, Marquis F, Chikhradze N |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2017 |
| Pages: | 590 pages |
| ISBN: | 978-1-987820-69-0 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Process of Chemical Stabilization and Mechanical Improvement of Slag through CO2 Capture
Erivelto Souza1; Orimar Reis2; Higor Coelho1; Leandro Duarte1; Tales Oliveira1; Denise Pereira3; Walinton Sousa1; Reimar Lourenco1;1UNIVERSIDADE FEDERAL DE SAO JOAO DEL-REI, Ouro Branco, Brazil; 2INSTITUTO FEDERAL DE MINAS GERAIS, Ouro Preto, Brazil; 3UNIPAC - CONSELHEIRO LAFAIETE, Conselheiro Lafaiete, Brazil;
Type of Paper: Regular
Id Paper: 115
Topic: 43
Abstract:
Metallurgy is one of the most important sciences developed by mankind, the steel industry is, in turn, the most important technique practiced within metallurgy. In order to produce the steel, for a long time, the objective products were generated, but also the process residues, which were discarded succinctly. With the evolution of the recycling processes, several of these residual materials became commercial use, as is the case of blast furnace slag. However, slags from steel mill processes, because of their high free CaO content, still had direct use restrictions. What is proposed here is a process that treats steel slag through a recomposition of this free CaO, leading it to become a calcium carbonate. Blast furnace slag is used for various processes where its chemical stability and mechanical strength is critical. The steel slag presents chemical instability, because, due to its high degree of hydration, this slag undergoes expansion and becomes mechanically weak, by the transformation of free CaO into Ca(OH)2. By means of this change the slag happens to present a better mechanical property, and no longer becomes susceptible to expansion by hydration. Associated with this advantage is the fact that each ton of processed slag allows to recover, on average, 136 kg of CO2 of the gases generated by the company itself. Thus, in addition to improving the properties of this specific steel residue, the process also allows a carbon capture of the generated gases.