Shaped refractory brick with peeling resistance and erosion resistance, preparation method thereof and refractory wall
An erosion-resistant and refractory brick technology, applied in the field of refractory walls, can solve the problems of increasing Young's transverse weight and reducing heat-resistant spalling, and achieve the effects of dense organization, improved erosion resistance and structural spalling resistance.
Active Publication Date: 2010-12-22
NGK INSULATORS LTD +1
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Problems solved by technology
However, due to the high refractory vitreous quality, the Young's transverse value increases, resulting in a decrease in heat peeling resistance
In this way, there has been no fixed-shaped refractory brick that combines heat spalling resistance and erosion resistance
Method used
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[0029] As shown in Table 1, alumina-silica aggregates of various particle sizes, amorphous ceramic powder (silica powder), calcined alumina powder and clay were mixed so that the total amount was 100% by mass. Phosphoric acid is further added externally as a binding agent to prepare a raw material blend adjusted to a certain moisture content. After it is press-molded, it is dried at 350°C to make shaped refractory bricks.
[0030] Microscopically observe the shaped refractory bricks to observe whether there is aluminum phosphate crystallization and whether there is uneven distribution of particles. In addition, an erosion test was performed according to JIS-R-2214, and an erosion index was calculated|required. This value is a value representing the ratio of the surface area of the corroded part by taking the area of the corroded part of the standard product as 100, and a smaller value means better corrosion resistance.
[0031] In addition, a peeling test was performed a...
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The invention provides a pressed and shaped refractory brick with peeling resistance and erosion resistance, a preparation method thereof and a refractory wall. The refractory brick is shaped by pressing raw material concoction, wherein aluminum oxide and silicon dioxide material particles are used as a main component of the raw material concoction, and the porosity of the shaped refractory brick is 3-15 percent. In the invention, 5-30 weight percent of thick and large aluminum oxide and silicon dioxide material particles of 5-30 mm are used for improving the heat resistant peeling resistance; aluminium phosphate crystals are mixed in a matrix combining the aluminum oxide and silicon dioxide material particles; and 1-10 weight percent of amorphous ceramic powder of which the mean grain size is below 1 mum is used for improving the erosion resistance. The shaped refractory brick can be manufactured by pressing the raw material concoction and then drying at 150-350 DEG C, and the refractory wall can be formed by the shaped refractory bricks.
Description
technical field [0001] The present invention relates to a shaped refractory brick having spalling resistance (spolisog resistance) and erosion resistance used, for example, as bricks for lining a rotary kiln, a method for producing the same, and a refractory wall. The spalling that becomes a problem in refractory bricks includes thermal spalling caused by thermal expansion of the base material and structural spalling caused by generation of a substance having a different thermal expansion coefficient from the base material. Background technique [0002] As lining bricks for rotary kilns and the like, shaped refractory bricks with excellent strength have been widely used conventionally. Peeling resistance and erosion resistance are required for such bricks. However, spalling resistance and erosion resistance of refractory bricks are negatively correlated, and it is difficult to make these two characteristics coexist. [0003] Generally, the thermal spalling resistance (easi...
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Login to View More IPC IPC(8): C04B35/66F27D1/04F27B7/28
Inventor 本庄哲博长谷川雅章
Owner NGK INSULATORS LTD