Refractory Technology Questions

• Skull is not formed on the carbon blocks in the hearth of a blast furnace, when it becomes cold, becaus of its
• Walls, roofs & combustion chambers of annealing furnaces are made of __________ bricks.
• Water content in ground refractory material to be shaped into bricks by hand moulding is about __________ percent.
• A steel member used in the furnace construction to take the thrust of the brickwork is called
• Grog
• With increase in the alumina content, the refractoriness of high alumina refractories
• Thermal diffusivity of a refractory brick is high, when its __________ is high.
• An indication of degree of firing in silica brick is its
• Quartz is
• Thoria
• Pyrometric cone equivalent (PCE) value (Segar cone) of 'superduty refractories' is more than 33 which corresponds to a temperature of __________ °C.
• Hot metal runner in blast furnace are lined with __________ bricks.
• Refractoriness/fusion points of 'superduty' refractories is __________ °C.
• Test piece for determination of RUL of a refractory is heated in a/an
• Chromite refractories
• Capacity of a refractory brick to withstand-sudden changes in temperature is denoted by the property called
• High porosity refractory bricks have
• Which is the stable form of silica between 1470°C and the melting point 1713°C?
• Fireclay bricks are not used in the
• Firing temperature is minimum (1250-1400 °C) for __________ bricks.