关键词: 尾矿, 瓦斯灰, 微波, 磁化焙烧, 磁选

Abstract: Fe grade of tailings from dressing plant of Baosteel is 17.84%,and Fe grade of furnace gas ash from Ironworks of Baosteel is 31.90%,with carbon content of 29.18%.In order to explore the efficient way for comprehensive utilization of two kinds of industrial solid waste residues,with the active coke from gas ash as reducing agent,and hematite in of tailings and gas ash as reduction object,conditioning tests for microwave heating reduction and roasting process were made,as well as the calcined products by grinding process.Results showed that under conditions of grain size of tailings ranged from 74 to 0 μm and mass ratio with blast furnace gas ash at 100∶25,microwave magnetic roasting under 570 ℃ for 10 min,and calcined product ranged from 33 to 0 μm by grinding,iron concentrate with iron grade of 54.50% and iron recovery of 83.20% was obtained by low intensity magnetic separation (80 kA/m).Hence,these two kinds of industrial solid waste residues from Baosteel can be used as resources,which brought enormous economic and social value.

Key words: Tailings, Gas ash, Microwave, Magnetic roasting, Magnetic separation