MEASUREMENT OF ELECTRICAL PROPERTIES AS EFFECTIVENESS APPRAISAL OF MICROWAVE ABSORPTION BY MOULDING AND CORE SANDS SUBJECT TO MICROWAVE UTILIZATION

Within the research, carried-out were examinations of foundry rejects in form of waste moulding and core sands in order to determine effectiveness of the microwave utilization process. Presented are measurements of permittivity and loss tangent that determine behaviour of materials in electromagnetic field. Measurements were performed on a stand of waveguide resonance cavity that permits precise determination of the above-mentioned parameters with the perturbation method. Examination results of five waste moulding sands confirm that effectiveness of microwave utilization depends on electrical properties of the sandmixes (permittivity and loss tangent)