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

作者：Junca Eduardo^*; Guisard Restivo Thomaz Augusto; Romano Espinosa Denise Crocce; Soares Tenorio Jorge Alberto

来源：Journal of Thermal Analysis and Calorimetry, 2015, 120(3): 1913-1919.

DOI：10.1007/s10973-015-4491-6

• Thermogravimetry
• Kinetic analysis
• Solid-gas reaction
• By-product of steel-making

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.

• 出版日期2015-6