An investigation of the silica deposits of southern Illinois . ch were ground down in an agate iaortar to pass a 60 mesh sieve,were made up into cones, using grape sugar for a bond. These v/ere made thesame size as the standard Orton cones used for high temperatures. The coneswere placed in a highly siliceous fireclay cone pad and alternated with staiid-ard cones. A heating rate of approximately 400^0 per hour was maintained ineach test, the total time required to reach the deformation temperature beingfrom four to six hours. A Fery radiation pyrometer was used as a check butregistered about 2
An investigation of the silica deposits of southern Illinois . ch were ground down in an agate iaortar to pass a 60 mesh sieve,were made up into cones, using grape sugar for a bond. These v/ere made thesame size as the standard Orton cones used for high temperatures. The coneswere placed in a highly siliceous fireclay cone pad and alternated with staiid-ard cones. A heating rate of approximately 400^0 per hour was maintained ineach test, the total time required to reach the deformation temperature beingfrom four to six hours. A Fery radiation pyrometer was used as a check butregistered about 250°C lower than the cone scale, as v/as the experience ofF. Footit in previous work with this instrument. Results. Material Sample Fusion Pointin Cones Fusion Point OFPyrometer. Novaculite 127 32-33 2825<^ 7/hite Silica 128 32-33 2835° 1021 32-33 2845° Gannister 125 29-30 2720° 1847 30 27500 126 30 27650 The variation in the fusion temperature can be traced to the impurities inin the materials. Thus the novaculite and gannister all show about the same. 12. chemical analysis and also show the saiue defom^ition temperature in this gannister, however, shows a much lov/er deformation temperature as would beexpected due to tlie increased impurities in the sample. The gannister, sample125, shows the lowest deformation tempemture, which is probably due to the increased alumina and iron content, over that of samples 126, suod 1847, whichanalyze about the same. Trouble v/as encountered in several runs due to the disappear^-nce of thetest cones. In most of the tests the cones had a. corroded appearance on thecomers, which seemed to indicate that volatilization took place. The poss-ibility of this v;a8 strengthened by the detection of cri^stalline material foundon the carbon electrodes at the end of one run. This material was found insome quantity, part being clear aiid colorless, and part being bluish in color. Another peculiar feature in these tests was the carbon deposi
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectminesandmineralresou
