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PB95147948

Publication Date	1994
Personal Author	Salsman, J. B.; Holderfield, S. P.
Page Count	27
Abstract	As part of the research effort on investigating the effects of microwave energy on the chemical and physical properties of minerals and ores, the U.S. Bureau of Mines' Tuscaloosa Research Center has conducted research to measure the dielectric properties of these materials. The objective was to establish a reliable data base for use in predicting the effects of microwave heating on a wide range of minerals. In this phase of microwave research, the Bureau measured the dielectric properties of powdered minerals with medium to high electrical conductivities in the frequency range of 300 MHz to 3 GHz and as a function of temperature, from 25 deg to 325 deg C. Since the minerals were prepared as powders, techniques were used to relate the measured dielectric properties of the powdered minerals to the dielectric properties of the mineral at its theoretical or natural density.
Keywords	Minerals Dielectric properties Microwave frequencies Heating Coaxial cables Measurement Powder(Particles) Density Constants Data bases Electrical properties Loss factor Loss tangent Open-ended coaxial line
Source Agency	Bureau of Mines
NTIS Subject Category	48A - Mineral Industries 49 - Electrotechnology 99F - Physical & Theoretical Chemistry
Corporate Authors	Bureau of Mines, University, AL. Tuscaloosa Research Center.
Document Type	Technical Report
Title Note	Rept. of investigations/1994.
NTIS Issue Number	199506

Technique for Measuring the Dielectric Properties of Minerals at Microwave Heating Frequencies Using an Open-Ended Coaxial Line.

Technique for Measuring the Dielectric Properties of Minerals at Microwave Heating Frequencies Using an Open-Ended Coaxial Line.
PB95147948

Publication Date	1994
Personal Author	Salsman, J. B.; Holderfield, S. P.
Page Count	27
Abstract	As part of the research effort on investigating the effects of microwave energy on the chemical and physical properties of minerals and ores, the U.S. Bureau of Mines' Tuscaloosa Research Center has conducted research to measure the dielectric properties of these materials. The objective was to establish a reliable data base for use in predicting the effects of microwave heating on a wide range of minerals. In this phase of microwave research, the Bureau measured the dielectric properties of powdered minerals with medium to high electrical conductivities in the frequency range of 300 MHz to 3 GHz and as a function of temperature, from 25 deg to 325 deg C. Since the minerals were prepared as powders, techniques were used to relate the measured dielectric properties of the powdered minerals to the dielectric properties of the mineral at its theoretical or natural density.
Keywords	Minerals Dielectric properties Microwave frequencies Heating Coaxial cables Measurement Powder(Particles) Density Constants Data bases Electrical properties Loss factor Loss tangent Open-ended coaxial line
Source Agency	Bureau of Mines
NTIS Subject Category	48A - Mineral Industries 49 - Electrotechnology 99F - Physical & Theoretical Chemistry
Corporate Authors	Bureau of Mines, University, AL. Tuscaloosa Research Center.
Document Type	Technical Report
Title Note	Rept. of investigations/1994.
NTIS Issue Number	199506