Identifier: investigationofs00slad (find matches)
Title: An investigation of the silica deposits of southern Illinois
Year: 1920 (1920s)
Authors: Sladek, George Edward
Subjects: Mines and mineral resources Mines and mineral resources Silica Silica Theses
Publisher:
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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nisters is evident, but here also theiron content is low. The alumina and lime contents for this material shows anincrease of 0.7 to 1.0/$ over those for the other tv/o. The increased iron con-tent is shown in the buff color. These samples also show a trace of TiO notdetected in the white silica or novaculite. The analyses shov/ a close relation,but sample 125 shows an increased iron and alumina content over the other two.This shov/s in the fusion tests carried on later. The analyses of the gannisterslie v/ithin the prescribed limits. Physical Properties:- Thg physical properties of the three materialsvaried considerably. The novaculite was hard aiid brittle. It splintered intovarious sized particles. It required, however, considerable grinding to producefinely, pt)v;dered material. The material was so hard that when crushed in thejaw crusher it caused sparks to fly and small pieces of the steel to be chippedfrom the jaws. These could be removed readily by a magnet in fair quantities.
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10. The gannister, after the novaculite was crushed to smaller pieces, couldbe worked like a slightly plastic clay. Pieces molded up and dried possessedenough strength to permit their being handled. This was probably due to the10^ ( approximately) fine material that would pass an 80 inesh sieve beforegrinding. The white silica was similar to the gannister in this respect. Thefine material, however, was in greater proportion amounting to about 15%, Thiswas cal:ed into lumps, sometimes, which could be easily broken by hand. Of the three ioateiials the novaculite from the standpoint of physicalproperties possessed the requisites of a good material for refractories. Thegannister because of the large amount of novaculite v/ould be suitable also.The silica would hardly be suitable from this point of view.Specific Gravity:- The specific gravities of the materials, as was expected,were very close. The samples used for chemical analyses were used for thespecific gravity determinations. The sam

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