Figure 3 focuses on the exact same location of your copper shaft furnace soon after two½ many years of operation with the improved silicon carbide bricks (apart from the destroyed space in the best portion from the photograph, which was where the regular silicon carbide bricks ended up used for https://www.quora.com/profile/Trevor-Flatcher-2/Advantages-and-Challenges-of-Silicon-Carbide-Specialty-Ceramics-Macrocosm-Materials-Company-Overview-Founded-in-2016