An investigation of the silica deposits of southern Illinois . ee fine grained substance in the original samples of the raw material. Afterthe dampened material had been mixed thoroughly by hand to insure a fair degreeof uniformity throughout, it was pressed and pounded into brass molds makingbrickettes, 4** x 1** x 1. These pieces were then cut into four one inch cubes,care being taken not to crack them in the cutting. The trial pieces were thendried in an oven and numbered. The binders used for the first series of the test were CaO, MgO, Plasterof Paris, CaCl2» and a mixture of MgClg and Cft
An investigation of the silica deposits of southern Illinois . ee fine grained substance in the original samples of the raw material. Afterthe dampened material had been mixed thoroughly by hand to insure a fair degreeof uniformity throughout, it was pressed and pounded into brass molds makingbrickettes, 4** x 1** x 1. These pieces were then cut into four one inch cubes,care being taken not to crack them in the cutting. The trial pieces were thendried in an oven and numbered. The binders used for the first series of the test were CaO, MgO, Plasterof Paris, CaCl2» and a mixture of MgClg and CftCl2 which was calculate to givean equivalent of 1^ MgO and 1^ CaO. The action of the binders during mixing wassame, but in the dried unbttmed , state gave a varied result. The lime gave the best bond, giving a hard product so that the trial piecescould be subjected to a fairly rough hcuidling without breaking them. The MgO gave a fair bond, resembling that of the lime without the saiae ^McDowell - Refractories - Page 16. degree of toughness. The plaster of paris gave a hard, but brittle bond so that a sharp knockcaused the pieces to chip and break. The chloride bonds were excellent immediately after removing the piecesfrom the drier,but after a few hours in the open the brickettes disintegrateddue to the deliquescent nature of the bonding agents. Furthermore, due to theirsolubility in water they were carried to the surface of the trial pieces, leav-ing the centers with little or no bond. SECOND SERIES:- The results from the first series after burning were so markedthat a second series was made up, with a greater niimber and variety of bondingagents. In this series the bonding agents used were, - Mn02 and enough CaOto make the lime content of the material equal to 2^, 2$ Ti02 and enough CaOto make total lime content 2^ 2^ Tennessee Ball Clay, 2^ Fe203, 2^ AI2O32^ Cr203, and 2/J Albany Slip. The ferric oxide and alumina were added b
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectminesandmineralresou
