MgO对球团矿抗压强度的影响

Effect of MgO on Compressive Strength of Pellet

以经焙烧处理的菱镁石作为含MgO添加剂生产氧化球团,考察了MgO含量对氧化球团抗压强度的影响.研究表明:随着球团矿中MgO含量的增加,球团矿的抗压强度逐渐下降.其主要原因为:球团中MgO含量的增加使得球团中Fe3O4氧化成Fe2O3再结晶过程减弱,连晶不完全,且分布不均,不利于球团矿的固结;通过对不同MgO含量的球团矿的孔隙分布及孔隙度分析可知,随着球团矿中MgO含量的增加,球团矿的孔径及孔隙度逐渐增大,导致球团矿的抗压强度不断下降.

The caustic calcined magnesite was used as an additive to produce an oxidized pellet.The effect of MgO-bearing on the compressive strength of pellet was investigated.The results showed that with the addition of MgO-bearing in pellet,the compressive strength of pellet decreases gradually.The reasons as follows：（1）the MgO makes against the recrystallization of Fe2O3 after Fe3O4 is oxidized to Fe2O3.The recrystallization of Fe2O3 is fainter,the crystallite is maldistributed and the consolidation of pellet is incomplete;（2）according to the pore space analysis of different MgO-bearing in pellets,with the addition of MgO-bearing in pellet,the porosity and aperture increase,leading to the decreasing of compressive strength of pellet.