Hostname: page-component-84b7d79bbc-dwq4g Total loading time: 0 Render date: 2024-07-25T14:17:18.732Z Has data issue: false hasContentIssue false
  • English
  • Français

The Effects of Power Level on the Microwave Heating of Selected Chemicals and Minerals

Published online by Cambridge University Press:  21 February 2011

S. L. McGill ,
J. W. Walkiewicz  and
G. A. Smyres
S. L. McGill
Affiliation:
Reno Research Center, Bureau of Mines, U.S. Department of the Interior, 1605 Evans Avenue, Reno, NV 89512-2295
J. W. Walkiewicz
Affiliation:
Reno Research Center, Bureau of Mines, U.S. Department of the Interior, 1605 Evans Avenue, Reno, NV 89512-2295
G. A. Smyres
Affiliation:
Reno Research Center, Bureau of Mines, U.S. Department of the Interior, 1605 Evans Avenue, Reno, NV 89512-2295
Get access

Abstract

The effect of power level on the microwave heating characteristics of a variety of reagent-grade chemicals and minerals has been determined in a Bureau of Mines study. Heating rates of the powdered samples are presented for incident power ranging from 500 to 2,000 W at 2.45 GHz. The apparatus consisted of a WR 975 waveguide-applicator mounted to WR 284 waveguide sections and connected to a 3-kW power source. Tests were conducted in an alumina crucible enclosed in a fused-quartz beaker that was fitted with a Teflon lid to allow for a controlled inert atmosphere and thermocouple insertion. In general, heating rates increased as input power increased. Exceptions to this were some very high-lossy (microwave receptive) and very low-lossy materials that showed negligible changes with increased power. Microwave data collected should provide insight as to possible chemical and mineral processing applications as well as to assist in predictions of processing parameters.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 124: Symposium M – Microwave Processing of Materials I , 1988 , 247
Copyright
Copyright © Materials Research Society 1988

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Metaxas, A. C. and Meredith, R. J.. Industrial Microwave Heating. IEE Power Engineering Series 4, (Peter Peregriuns Ltd., London, U.K., 1983) pp. 296–321.Google Scholar
2. Walkiewicz, J. W., Kazonich, G., and McGill, S. L.. Miner. and Metall. Proc., 5 (1), 39–42 (Feb. 1988).Google Scholar
3. White, J. R.. Why Materials Heat. Theory and Applications of Microwave Power in Industry: A Short Course. International Microwave Power Institute, 1971.Google Scholar
4. Walkiewicz, J. W., McGill, S. L., and Moyer, L. A.. Paper No. M4.7, Symp. Proc. on Microwave Processing of Materials, Mater. Res. Soc. 1988 Spring Meeting, Reno, NV, April 5–8, 1988.Google Scholar