硫酸渣磁铁精矿球团试验研究

Study on pelletizing of magnetite concentrate, which was made from low grade pyrite cinder after reduction roasting and magnetic separation, has been carried out. Under the conditions of 1.5% Husi bentonite, 16.8% moisture and 10 min balling duration, the drop number and compressive strength of green balls can reach 5.3 times from 0.5 m height and 31.55 N per pellet, respectively and thermal shock temperature of green balls achieved 435 ℃. After drying, green balls were preheated at 900 ℃ for 10 minutes and fired at 1200 ℃ for 15 minutes, the compressive strength reached 2871 N per fired pellets. Reduction Index, Reduction Swelling Index and RDI-3.15 of fired pellets were 83.38%, 17.86% and 6.12%, respectively. It was proved that by using this magnetite concentrate, high quality oxidized pellet can be produced as a blast furnace feed. The technology will benefit steel mills by giving more options for iron-bearing material sourcing and at the same time iron resource in pyrite cinder can be fully utilized, which will significantly reduce pollution by consuming the waste in vitriol industry and protecting land and waters for pyrite cinder stocking.