Effect of Na_2O on alumina leaching and self-disintegrating property of calcium aluminate slag

摘要

Effect of Na_2O content on Al_2O_3 leaching rate andrnself-disintegrating rate of calcium aluminate slag arernstudied by adding Na_2O into pure calcium aluminaternslag. And the reaction mechanism is also discussed byrnXRD analysis initially. The results indicate thatrnLattice distortion and the weakness of bond energyrnwhich is asymmetry in Molecular are caused by thernsolid solution of Na_2O into12CaO•7Al_2O_3. And thisrnmake Na_2CO_3 and H2O easy to penetrate intorn12CaO•7Al_2O_3 crystal, and improve the reactionrnspeed and degree. So the existence of Na_2O willrnimprove the leaching property of calcium aluminaternslag. But the self-disintegrating property of slag willrnbe decreased because a great amount of β-2CaO•SiO_2rnis formed when the content of Na_2O is higher thanrn2.5%. Considering from the property of calciumrnaluminate slag only, the largest allowable content ofrnNa_2O is 2.0～2.5% in slag and 1.2～1.5% in materials.