f) Why would you consider installing a conductive hearth in a slag cleaning furnace? g) Why do we use (i) graphite and (ii) SiC in refractory formulations? h) How would you improve the penetration resistance of a refractory material? i) Distinguish between conventional castables, low cement castables and cement free castables by highlighting how (i) flow is achieved, and (ii) bonding is achieved. j) List the raw materials that are typically used as aggregate, matrix components and binders in a taphole clay. Highlight the functions of each of these raw materials