Large format fireclay refractory block and method of producing the same

摘要

A large format fireclay refractory block for use in a tin bath includes a material including fine grains and large grains. The fine grains have a diameter of less than 0.075 mm and they include more than 65 percent by weight of SiO2 and less than 35 percent by weight of Al2O3. The fine grains include an increased amount by weight of alkali acid and of silicid acid and a decreased amount by weight of Al2O3 for forming a glass phase in the fine grains. The large grains have a diameter of more than 1.500 mm and they include less than 65 percent by weight of SiO2 and more than 35 percent by weight of Al2O3. The block includes a fist surface being made of the material and being adapted for contacting a tin bath. A method of producing such a large format fireclay refractory block includes the steps of preparing the fine grains and the large grains separately, preparing a material by mixing the fine grains and the large grains, forming a block of the material, drying the block, firing the block and grinding the block to its desired dimensions.