Abstract: A method of producing an economical refractory material from the slag by-product of a high-carbon ferrochromium ore smelting process wherein the slag by-product is a fused material in solid particulate or mass form formed of a mixture of compounds comprising principally magnesia, alumina and silica, with lesser amounts of chromic oxide and other minor oxide impurities therein. Also disclosed is a process for forming a solidified refractory lining in a high temperature materials-receiving vessel from solidified fused slag by-product of a high temperature ferrochromium ore smelting process, wherein the slag refractory lined vessel may be employed directly to receive and handle high temperature molten materials and insulate the same from damage to metal parts of the vessel, and without the need for conventional prior art refractory materials constructed therein.