Fire brick refractory

Refractories, Fire Brick-Specialties, Uses in Industrial Importance,The Refractories Institute, Pittsburgh, Pa., 1975. 

There are a number or types of special brick obtainable from individual producers. High-burned kaolin refractories are particularly valuable under conditions of severe temperature and heavy load or severe spalling conditions, as in the case of high-temperature oil-fired boiler settings or piers under enamehng furnaces. Another brick for the same uses is a high-fired brick of Missouri aluminous clay. 

Sources. From manufacture of refractory crucibles, fire bricks, magnesia cements, boiler scale compounds... 

Modem installations often impose furnace conditions so severe that refractories other than lire-clay are needed. High aluminum and silicon carbide refractories are typical of tlie.se. The heal conductivities of the super-refractories are larger than those of lire-clay brick, and such construction should be backed up with high temperature insulation. Silicon carbide blocks are the most refractory and have the quality of resisting clinker adhesion heitcr than ordinary fire-brick. Their fusion temperature is about 4000 F (2204 C)... 

Clay fuses at from 2800 tit 3200T. tl53fi to 1760 0 the uppet limit being for flint clay and the lower for the plastic form which, due to its cc-mcming qualities, is especially valuable in fire-brick manufacture, Red brick is not suitable for refractory service, nor is insulating brick. There are several fire-clay furnace cements on the market that arc adaptable to monolithic lining. The standard sire of fire-brick and insulating brick is 9 inches by 4i inches by 2i inches 122.9 by 11.4 by 6.4 centimeters). 

More specialized ceramics include refractory silicates such as mullite, Al6Si20i3, or binary oxides such as MgO, AI2O3, TiOy, or stabilized zirconia, which are fired and sintered, sometimes under pressure at 1500-2000 °C. A great deal of this refractory production involves the fabrication of low and medium density fire-bricks for ovens and furnaces. 

Installations producing ceramic products by means of firing, particularly tiles, bricks, refractory bricks, glazed tiles, stoneware or porcelain articles, with a production capacity in excess of 75 tonnes per day and a firing capacity of over 4 m3 and over 300 kg/m3 load density per kilo. ... 

Besides firebricks, tiles made of similar refractory material are frequently used in furnaces and similar constructive work. They are particularly useful for covering spans of more than 6 inches, such as occur in flues and small fireplaces. Thus we have seen in Chapter IY. that the bed of a blind roaster is made of tiles, the reason for this being that we are thus enabled to make the flues wider. If we were to use ordinary or fire bricks for the purpose, we could not place the side walls forming the flue more than 5 or 6 inches apart, otherwise the 9-inch brick would not rest on them securely. By using tiles we can therefore span distances which are too large to be covered by brick, and too small to be covered by arches, or where, for other reasons, it would be inconvenient to use an arch. 

This reactor section containing the fluidized bed is 28 inches od and 15 inches id. The insulation lining is 4 inches of Type 1620-K fire brick (Babcock and Wilcox Co.) and 2 inches of Plicast Tuff-Mix castable refractory (Plibrico Co.). The height of this section is 8 ft. Above the fluidized bed section, the reactor diameter expands to 35 inches od and 22 inches id. This particle-disengaging chamber is 4 ft high and is lined in the same manner as the fluidized bed section. 

Fire brick- Brick made of refractory ceramic material which will resist high temperatures. Used in a fireplace and boiler. 

A horizontal filtration bed made by graded, screened pieces of fire bricks. The top layer consisted of bigger pieces to prevent disturbance of the lower bed of finer pieces—which is the real filter medium. The bottom layer again consisted of bigger pieces. A gas distributor plate at the gas inlet nozzle further ensured proper distribution of dirty gas over the bed. The beds were provided with cast iron or refractory brick supports and grids. 

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