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bd40bc7c7a Screen reader users, click the load entire article button to bypass dynamically loaded article content. Hence, there is need to improve the refractory properties of this clay. Cookies are required to use this site. or its licensors or contributors. MaterialsAs-mind samples of (Kankara clay) and coal ash were obtained from the stockyard of the refractory Department of the National Metallurgical Development Center, Jos, Nigeria. The firing procedure used involved heating and soaking the samples at various temperatures : 250C for 6h; 650Cfor 4h; 950C for 3h; 1100Cfor 8h and 1600Cfor 8h.