An investigation of the silica deposits of southern Illinois . 32* Comparison of the Bonds:- The trial pieces aade of gannister v/ere always thestrongest, the white silica having a tendency to be weaker and more friable. Thenovaculite trial pieces were all weak a3::!d friable, many of them being disintegrat-ed in hot water in a short time. The CaO of the bonding agents gave the best bond for all the materials butthe white silica. The precipitated AlgO^ gave the best bond for this. The re-maining bonds weie inferior. T-ie brickettes v/ith chloride binders all buniedwhite due to the formation of
An investigation of the silica deposits of southern Illinois . 32* Comparison of the Bonds:- The trial pieces aade of gannister v/ere always thestrongest, the white silica having a tendency to be weaker and more friable. Thenovaculite trial pieces were all weak a3::!d friable, many of them being disintegrat-ed in hot water in a short time. The CaO of the bonding agents gave the best bond for all the materials butthe white silica. The precipitated AlgO^ gave the best bond for this. The re-maining bonds weie inferior. T-ie brickettes v/ith chloride binders all buniedwhite due to the formation of FeQlg, which was then volatilized. All the pieceswith such bonds had a tendency to be weak and of Repeated Burning on the Specific Gravity:- To determine the araount of volune increase ( or specificgravity drop) caused by the first bum to Cone 16 in proportion to the totalarount the material v/ould undergo, some of the trial pieces v;ere bun:ed a thirdtime to Cone 15. The trial pieces used for this were those of the first seriesv/ith 2^ CaO f
Size: 1326px × 1884px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjectminesandmineralresou
