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Which material is applied to the hearth if the process is acidic?(a) Silica(b) Dolomite(c) Silicon monoxide(d) Xenon di fluorideI had been asked this question at a job interview.Question is taken from Open Hearth Surface topic in division Metal Furnace and Practice of Casting-Forming-Welding II

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Right answer is (a) SILICA

Best EXPLANATION: In an open hearth furnace, there is a large basin which is CALLED as hearth furnace. If the OPERATION is going to be acidic, there is a lining of silica provided to the hearth.



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