Effective use of low-grade goethite ores in steel industry is necessary to achieve cost reduction and solve the problem of resource shortage. Biomass as heating and reducing agent attract much more attention for utili...Effective use of low-grade goethite ores in steel industry is necessary to achieve cost reduction and solve the problem of resource shortage. Biomass as heating and reducing agent attract much more attention for utilization in ironmaking process due to its low-carbon, energy-saving, emission-cutting and low-cost. We investigate three types of biomass (corn straw, pine sawdust, rice husk powders) roasting reduction mechanism and the magnetism of the roasting products. Structure analysis indicates that 15% dosage of each biomass mixed with goethite ores roasting at 550-600 °C for 1h could be effectively converted into strong magnetic product, i.e. maghemite (γ-Fe2O3). Weak magnetic separation shows that under the magnetic field of 200 kA/m, goethite ores roasted by 15% of pine sawdust could achieve TFe 61.64% with the recovery of 79.75%, TFe 61.75% with the recovery of 80.16% for roasting with rice husk, and TFe 61.47% with the recovery of 81.28% for roasting with corn straw.展开更多
文摘Effective use of low-grade goethite ores in steel industry is necessary to achieve cost reduction and solve the problem of resource shortage. Biomass as heating and reducing agent attract much more attention for utilization in ironmaking process due to its low-carbon, energy-saving, emission-cutting and low-cost. We investigate three types of biomass (corn straw, pine sawdust, rice husk powders) roasting reduction mechanism and the magnetism of the roasting products. Structure analysis indicates that 15% dosage of each biomass mixed with goethite ores roasting at 550-600 °C for 1h could be effectively converted into strong magnetic product, i.e. maghemite (γ-Fe2O3). Weak magnetic separation shows that under the magnetic field of 200 kA/m, goethite ores roasted by 15% of pine sawdust could achieve TFe 61.64% with the recovery of 79.75%, TFe 61.75% with the recovery of 80.16% for roasting with rice husk, and TFe 61.47% with the recovery of 81.28% for roasting with corn straw.
