Application of stepwise isothermal analysis method in the kinetic study of reduction of basic oxygen furnace dust

Autor(es)

Junca, Eduardo ^[1] ; Guisard Restivo, Thomaz Augusto ^{[1, 2]} ; Romano Espinosa, Denise Crocce ^[3] ; Soares Tenorio, Jorge Alberto ^[3]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Met & Mat Engn, BR-05508900 Sao Paulo, SP - Brazil

^[2] Univ Sorocaba, BR-18023000 Sorocaba - Brazil

^[3] Univ Sao Paulo, Dept Chem Engn, BR-05424970 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY; v. 120, n. 3, p. 1913-1919, JUN 2015.
• Citações Web of Science: 3

Resumo

Basic oxygen furnace (BOF) dust is a by-product of steel plants that is rich in iron oxide. Reduction of this by-product may provide reutilization alternatives in steel industry. In this context, kinetic study was conducted using BOF dust pellets applying the forced stepwise isothermal analysis method. This work examines the reduction of BOF dust pellets using a mixture between hydrogen and carbon monoxide. Mass loss of 26 % was obtained after reduction of the BOF. Carbon oxide present in the reducing gas led to the formation of a carbon layer around the pellet between 550 and 650 A degrees C. At higher temperatures, from 700 to 850 A degrees C, it was observed that reduction was controlled by porous diffusion. In the range 900-1,000 A degrees C, the control mechanism was determined as reactive species diffusion through metallic alloy lattice in individual particles. (AU)

• Processo FAPESP: 11/51638-0 - Reciclagem de poeira de aciaria:estudo da redutibilidade de poeira de aciaria LD, elétrica e ferrita de zinco
• Beneficiário: Jorge Alberto Soares Tenório
• Linha de fomento: Auxílio à Pesquisa - Regular