ISSN:
1551-2916
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
The thermal disintegration processes of A-type zeolites and the properties of the materials that were formed after microwave heating (at 2.45 GHz) were studied. The thermal disintegration of 4A-type zeolite proceeded as follows: disintegration at ∼880°C, followed by transformations to high-carnegieite 1 at ∼920°C, nepheline (in nepheline(4A) form) at ∼990°C, and high-carnegieite 2 at ∼1254°C (further heating led to melting at ∼1526°C). High-carnegieite 1, nepheline(4A), and high-carnegieite 2 efficiently absorbed microwaves. Cooling of the molten material yielded low-carnegieite that contained some impurities. The change of 3A-type zeolite proceeded as follows: disintegration at ∼910°C and transformation to nepheline (in nepheline(3A) form) at ∼1006°C. In 3A-type zeolite, in contrast to 4A-type zeolite, carnegieite did not form before the crystallization of nepheline(3A). Nepheline of high purity and carnegieite with some impurities were synthesized easily by heating 3A- and 4A-type zeolites, respectively, using microwaves. These results suggest that the microwave heating of zeolites can be used to prepare some ceramic materials.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1151-2916.2001.tb00657.x
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