Effects of Rare Earth Chlorides on Properties of Al_2O_3-MgO Castables

摘要

For the urgent requirements of high performance castables in iron and steel making industry, effects of rare earth chlorides on properties of Al_2O_3-MgO castables were addressed. The prepared castables were compared in terms of phase compositions, apparent porosity, bulk density, permanent linear change and strength. It was demonstrated that cerium chloride and yttrium chloride exhibited a positive influence on in-situ reactions and volumetric stability of castables. The cation inversion degree of spinel and solid-soluted content of spinel and CaAl_(12)O_(16) (CA_6) were both dependent on the temperature and addition. Cold modulus of rupture for castbles with rare earth chlorides additions calcined at 1450℃ was similar to that for referenced castables though the former ones were relatively less at 1250 and 1350℃.