Mining and Metallurgy Volume 141

Mining and Metallurgy Volume 141

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1918 edition. Excerpt: ... The drying operation presents no difficulties and requires no special precaution. It is possible, immediately after molding, to put the bricks into a heated stove and dry them in a few hours. In this respect, silica bricks differ from clay bricks in that drying does not produce any contraction. With bricks containing a large amount of impalpable silica, the operation may require more care, but is never difficult. Firing Firing is the most important feature in the manufacture of silica brick, and also the most expensive; unfortunately the best conditions for firing are not yet fully understood. Tests are difficult to make on account of the length of firing and the dimensions of the furnace in which firing is done; firing often lasts for 20 days and may take place in a furnace holding 200 to 300 tons of brick at once. The maximum temperature of firing is often considerably exaggerated. We often hear of firing temperatures of 1500 and even 1600, but we do not believe that any silica brick are ever actually fired at temperatures exceeding 1400, and base this belief on the two following facts: In the most intensive firing, the heat is generally limited to Seger cones No. 16 to 18, corresponding nominally to temperatures of 1450 and 1490; numerous experiments, however, have shown us that in ceramic furnaces, in which the heat is maintained for a long time, Seger cones melt at temperatures between 70 and 100 lower than in calibration tests, which are always conducted very rapidly. Furthermore, on examining the expansion of commercial brick, produced by subjecting to a second firing, we have determined that they all began to expand rapidly upon reaching a temperature of 1400, which proves that they had not undergone this temperature in the more

Product details

  • Paperback | 114 pages
  • 189 x 246 x 6mm | 218g
  • United States
  • English
  • black & white illustrations
  • 123686204X
  • 9781236862044