MgO对高镁碱性球团矿强度的影响

Effect of MgO Content on the Strength of High Magnesium Alkaline Pellets

为了探究MgO含量变化对高镁碱性球团矿强度的影响规律，采用本地磁铁矿配以钙镁添加剂的方式造球。同时运用Factsage热力学软件，液氮吸附仪，X-射线衍射仪等检测手段，探究在固定碱度为1.0前提下，MgO含量变化对高镁碱性球团矿强度的影响规律。结果表明：在固定碱度为1.0的前提下，随着MgO含量的增加，高镁碱性球团矿焙烧球液相生成量减少；庙沟矿、高镁粉及高钙粉孔径分布全在1～50 nm之间，属于介孔且相对高镁粉及高钙粉，庙沟矿的比表面积较小。球团矿生球机械强度呈先增大后减小的趋势发生变化；焙烧球强度呈先上升后下降的趋势发生变化，且在碱度为1.0，MgO含量为1.0%时强度达到最大。

In order to study the effect of MgO content on high magnesium alkaline pellet strength, Fact- sage thermodynamic software, liquid nitrogen adsorption instrument, and X- ray diffraction method had been used with fixed basicity of 1.0. The results show that under the premise of 1.0 fixed basicity, with the increase of MgO content, the amount of liquid phase in high magnesium pellet decreases, and Miao- gou Iron Concentrate Ore, high magnesium powder and high calcium powder pore size distribution all are in range of 1 ~ 50 nm, which belongs to the mesoporous and relatively high magnesium powder and high calcium powder, and Miaogou iron concentrate ore area is smaller. The mechanical strength of pellet first- ly increases and then decreases; roasting ball strength increases firstly and then decreases. At the given basicity of 1. 0, when the MgO content of 1 . 0% the strength reaches the maximum value.