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Ohio river and Ottawa silica sand

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  • 发布时间:2006-12-18 17:37
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Ohio river and Ottawa silica sand

【概要描述】Ottawasilicasandisunique.Itsroundedgrainsofclearcolorless  quartz,diamond-likeinhardness,arepuresilica(silicondioxide)  uncontaminatedbyclay,loam,ironcompounds,orotherforeign  substances.Itisobtainedf

  • 分类:公司资讯
  • 作者:
  • 来源:
  • 发布时间:2006-12-18 17:37
  • 访问量:0
详情

  Ottawa silica sand is unique. Its rounded grains of clear colorless

  quartz, diamond-like in hardness, are pure silica (silicon dioxide)

  uncontaminated by clay, loam, iron compounds, or other foreign

  substances. It is obtained from the St. Peter sandstone, a massive

  formation from 140 to 275 feet in thickness, that outcrops along the

  Illinois and the Fox rivers near Ottawa.

  On the outskirts of that city, where the Ottawa Silica Sand Co. quarries

  and processes this material, the top of the sandstone is only a few feet

  below the surface; 10 miles east it dips downward about 800 feet.

  Downstream between Ottawa and Utica, Starved Rock and Buffalo

  Rock (also a state park) and Split Rock are isolated masses of St. Peter

  sandstone which became detached from the bluffs by erosion and rise

  like towering fortresses above the valley floor.

  Silica sand is also obtained from quarries at Streator and near Alton in

  Illinois; along the Huron river at Rockwood, Michigan; in Minnesota,

  Connecticut and elsewhere; but the St. Peter sandstone at Ottawa

  produces the purest and the best, carefully screened into uniform sizes

  for various industrial uses.

  Glass is made from silica sand. The purer the sand, the clearer the glass.

  Any impurities, especially traces of iron compounds, discolor it. Ottawa

  silica sand is shipped to glass manufacturers in many parts of the United

  States and the Libbey-Owens-Ford Glass Co. has a big plant at Ottawa

  where they manufacture plate glass wind shields and windows for

  automobiles.

  Silica sands with uniform grains of specified size must be used for the

  molds and cores in foundries that make steel castings, and for casting

  gray iron, brass, aluminum and magnesium metals. Since silica sand has

  a very high melting point, it is used in the manufacture of fire brick and

  to line the bottoms of furnaces making malleable iron. Because of its

  extreme hardness, there are many other industrial uses such as for sand

  blasting castings and the inscriptions on monuments; for sawing stone

  or marble with sand and water; for sandpaper and for abrasives used in

  grinding and polishing.

  The filter beds in water purification plants are filled with Ottawa silica

  sand. Many years ago it was chosen by the American Society for

  Testing Materials as the standard sand to be used in testing cement and

  the strength of concrete.

  This humble mineral from Illinois has vast importance

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