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摘要
Precise particle size measurements are important in many aspects of engineering geology, e.g. in mineral processing and the study of methane hazard in coal mines. The volume of grains, estimated exclusively on the basis of dimensions of the grains differs tens of percent from the volume obtained from 3D digital measurements. This confirms that full three-dimensional automatic imaging can be used in the measurements of the particles. The paper discusses the technique of three-dimensional imaging performed with the use of three types of devices. Coal particles representing the 0.5-1.0 mm grain fraction were chosen as the research material. The measurements were performed by means of: X-ray computed tomography, confocal microscopy and optical profilometry. The last two techniques are less costly and more easily available than computed tomography. For the X-ray CT scanner, full three-dimensional imaging was performed. In the case of the other two techniques, only those parts of the particles that were captured by the heads of the relevant devices in question were measured. The invisible parts of the particle were reconstructed with the assumption that the bottom part of the particle is similar (in some scale) to the top part of the particle. The results obtained by means of X-ray CT scanner were used as the correct volume and size values. The results indicate that measurements carried out carefully and with use of the more easily available and less costly equipment, combined with careful data processing, can be used instead of methods that are expensive and harder to employ. The percentage deviation between the volume calculated with use of the data obtained with the X-ray CT scanner and the volume calculated with use of the data obtained with the other two devices varies from 02% to ca. 5%.
- 出版日期2015-9-30
