An investigation of the silica deposits of southern Illinois . rts, where it givee satisfactory results. In view of the great demand for acid or silica refractories it was des-irable to know the properties of these three materials, v;ith the idea of usingthe novaculite and silica for such purposes, if it were profitable. Furthermore,the behavior of these materials under certain conditions might be of valueregarding similar materials or other forms of silica material now used. It wasfor this reason that this investigation v/as carried out. PART 1. PROPERTIES THE USE OF
An investigation of the silica deposits of southern Illinois . rts, where it givee satisfactory results. In view of the great demand for acid or silica refractories it was des-irable to know the properties of these three materials, v;ith the idea of usingthe novaculite and silica for such purposes, if it were profitable. Furthermore,the behavior of these materials under certain conditions might be of valueregarding similar materials or other forms of silica material now used. It wasfor this reason that this investigation v/as carried out. PART 1. PROPERTIES THE USE OF ialysis;- The chemical analysis of silica materials although not acriterion for determining the use of the material, assists in judging itsqualities to some extent. Although not representative of its deformation pointit gives some idea as to the conduct of the material under high silica content should be between 96% and 98/^ to produce a suitable refract-ory. V/ith less than this amount its refractory power is impaired ajid with more. than 9Qfo the material usually shows defects in strength and permanent expansionupon heating. The presence of ^ to ^ impurities in the forri of AI2O3and ^6203 is necessai-y to produce strong brick. The addition of impurities tothe raw material does not remedy this defect to any practical extent. Thepresence of more than that amount usually affects the refractory property ofthe raw material to too great an extent. The amount of alkalies should alwaysbe less than 0*5% because of their powerful fluxing action. A typical einalysis of several silica materials used for making refract-ories are as follov/s:- Oxides MedinaQuartzite-^ BarabooQuartzite-^ AlabamaQuart 2 it e-- IndianaChert2 Si02 AI2O3 Fe203 CaO MgO Alkalies Although the above limits are said to be those necessary for silica mat-erial for refract
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectminesandmineralresou
