UTILIZAÇÃO DE ESCÓRIA DE ACIARIA DE FORNO ELÉTRICO A ARCO NA CARBONATAÇÃO ACELERADA
USE OF ELECTRIC ARC FURNACE STEELMAKING SLAG IN ACCELERATED CARBONATION
DOI:
https://doi.org/10.29183/2447-3073.MIX2025.v11.n2.165-175Palavras-chave:
Carbonatação acelerada; Escória de aciaria de forno elétrico a arco; Sequestro de carbonoResumo
A valorização de rejeitos industriais na indústria siderúrgica possui grande interesse no modelo de economia circular e também na idealização de estratégias para sequestro de carbono. Atualmente, em razão de políticas sustentáveis, cresce o número de plantas de processos industriais em fábricas de aço, onde há a troca do sistema de fabricação do aço via fornos de oxigênio básico (FOB) por fornos elétricos a arco (FEA). Em relação ao FOB, o FEA tem vantagem ao utilizar uma fonte de energia renovável e reaproveitar a sucata para a produção do aço, tendo, portanto, uma menor emissão de gases poluentes. O processo com FEA gera subprodutos, como a escória, com composição química diferente dos resíduos do processo FOB, que limitam seu emprego em usos convencionais na construção civil, como em obras de infraestrutura ou como adição ao cimento. O processo de carbonatação acelerada permite que as reações entre o CO2 e os óxidos presentes na escória de aciaria FEA ocorram em menor tempo no reator, com ganho expressivo na resistência à compressão e estabilidade química das amostras, quando comparado a carbonatação do material em condições atmosféricas.
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