Some Problems Relating to the Constitution of Liquid Slags with Special Reference to the Na₂O–MnO–SiO₂ System

JSGT 1956 V40 T429-T444

 Physical methods of investigating slag systems are briefly discussed, with particular reference to microscopic examination of slags by means of reflected light and thermal methods. The thermal equilibrium diagram obtained by using these methods for silica-rich compositions of the system Na₂O–MnO–SiO₂ is presented, and compared with those of related ternary systems. An interesting feature of the Na₂O–MnO–SiO₂ system is the occurrence of a region of liquid immiscibility which appears to be different in nature from those commonly encountered in silicate systems. The reasons for liquid immiscibility in slag systems are discussed.