Page No. 254
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Addition of zircon to silica refractory brick improves its_____________________?
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Bottom of basic open hearth furnace are constructed of__________________?
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Fusion temperature of pure silica (SiO2) is _______________ °C?
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Porosity of fireclay refractories is _______________ percent?
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High alumina refractory compared to fireclay bricks have____________________?
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Mullite is chemically represented by_________________?
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Which one contains minimum percentage of SiO2 ?
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