Technical Control of the Colloidal Matter of Clays

Technical Control of the Colloidal Matter of Clays

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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. 1913 edition. Excerpt: ...they had been allowed to settle. TABLE III Sagger Clay (James P. Prall, Woodbridge, N. J.). Effect of Addition of NaOH to the Clay (A) in the Crude State; (B) After Removal of the Soluble Salts by Long Dialysis with Water (A) The table shows that there is a decided difference in behavior toward NaOH of the crude clay and of the clay from which the soluble salts have been removed. In presence of the greater concentration of NaOH the liquid seemed to change to a thin jelly, which thickened as the concentration increased; concurrently the bulk of granular sediment seemed to shrink and finally almost to disappear. This is attributed to the fact that the thickening gel is able to hold in suspension progressively coarser grains, until finally gel and grains become intimately and uniformly mixed. On the diagram (Fig. 3) the total volume occupied by this mixture of gel and sediment is given by the line marked "recoagulated." Fig. 2.--Effect of additions of NaOH to a dialyzed sagger clay (No. 1, Jas. P. Prall, Woodbridge, N. J.) Cf. Table III and Fig. 3. In each tube 5 grams clay; amount of NaOH as given above. Photograph taken after the tubes had been allowed to settle cc 0.1 N 1 0 0.3 cc 0.1 N 0 3 10 30 HCI NaOH Fig. 5.--Effect of additions of HCI and of NaOH to an English china clay (Hammill and Gillespie's A 1) Five grams clay in each tube; amount of reagent as stated above 13. SOLVENT ACTION OF SUCCESSIVE PORTIONS OF WATER Unlike the Hall kaolin, the Prall sagger clay can not be freed of soluble salts by repeatedly shaking with water, settling, and decanting; for, after a few portions of water are removed, a portion of the clay goes into very permanent suspension. An attempt was made to determine how much of this clay is removable...show more

Product details

  • Paperback | 42 pages
  • 189 x 246 x 2mm | 95g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236885368
  • 9781236885364