白云鄂博铁精矿配碳球团还原特性研究

Investigation on the Reduction Features of Carbon-containing Pellets of Bayan Obo Iron Ore Concentrate

以白云鄂博铁精矿配碳球团和某外矿铁精矿配碳球团为研究对象,在950~1 100℃下进行等温还原试验。经相同条件还原后,对比两种球团的还原度及球团体积变化得到白云鄂博铁精矿配碳球团的还原特性。发现在相同条件下,白云鄂博铁精矿配碳球团的还原度均大于某外矿铁精矿配碳球团,但两者差值随还原温度的升高而减小;球团收缩率及球团表面开裂程度均随还原温度的升高而增大,且白云鄂博铁精矿配碳球团的球团收缩率大于某外矿铁精矿配碳球团。

Carbon-containing pellets of Bayan Obo iron ore concentrate and the other ordinary iron ore concentrate were used for the isothermal reduction experiments at 950 ~ 1 100 ℃.Under the same reduction conditions,the features of the carbon-containing pellets of Bayan Obo iron ore concentrate were obtained by comparing the reduction degree and the shrinkage rate of two kinds of pellets.Experiment results show that the reduction degree of the carbon-containing pellets of Bayan Obo iron ore concentrate is more than that of ordinary iron ore concentrate,but the difference valuebetween them decreases with increasing reduction temperature.For the two kinds of pellets,shrinkage rate of pellets and pellet’s surface cracking degree are bigger when reduction temperature increases. However,the shrinkage rate of pellets of the carbon-containing pellets of Bayan Obo iron ore concentrate is bigger than that of the ordinary iron ore concentrate.