Abstract
The solubility of MgO in molten MgCl2 and CaCl2 has been studied. In pure MgCl2, the MgO solubility was determined to be 0.63—2.90 mol% at 1073—1373 K, while 0.24—0.63 mol% in pure CaCl2 at 1223—1523 K. The effects of MgCl2 and CaO addition to CaCl2 were investigated, and the solubility product of MgO was found to increase with the amount of MgCl2 addition, while CaO addition did not affect significantly. They were explained in terms of the activity coefficient of oxide ion (O2−) as well as the enthalpy of mixing for the MgO-CaCl2 system. From the experimental results, the corrosion possibility of MgO refractory by Cl-containing gas was considered.
