ADVANCED METHODS TO CHARACTERIZE THERMAL PROPERTIES OF QUARTZ

摘要: Six different types of quartz and quartzites used as raw materials by ferroalloy plants have been investigated with respect to their thermo mechanical properties. In order investigate the effect thermal shock caused rapid heating when it enters furnace, following techniques for both in situ investigations pre-heated quartz: − Heating stage microscopy observation effects. Shock an induction furnace An optical microscope-mounted was observations microscopic effects up 1300 oC. The were observed at temperature intervals samples. main below 573 oC above 1000 cause is interpreted fluid inclusion decrepitation T 1200 °C. samples carried out ten minutes. studied such direct during directly after heating, XRD. Combined transmitted fluorescence light shows that heated show opening grain boundaries evenly distributed micro cracks not present unheated reference some samples, weak generation cristobalite detected