Notes on Assaying and Rudiments of Chemical Nomenclature, Mineralogy and Lithology

Notes on Assaying and Rudiments of Chemical Nomenclature, Mineralogy and Lithology

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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. 1904 edition. Excerpt: ... ores, with their comparatively low. S1O, and high base-(meta1lic oxides) con tent, would naturally require the following changes in the O.C.: Decrease amount of PbO to 5/4 or 1/2, add glass from 1/4 tc 1 cup, and use uaesuo, cover. If these ores are mixed with Qgglg ox _ig d7or oxidizing ores;'flux according to the principle of increasing the acid fluxes, decreasing the basicfluxes as the ore becomes less siliciousf'and using Na, s, o, . Furthermore, the R.F.=wculd be increased as the ore showed more signsxof being oxid_1ZLr_l_g_;'."-;-.1;-', . C-J With sulohideg in the ore, the principle to work on wouldbe toiincrease the acid fluxes, decrease the R.P., keeping the PoO fairly high (not less than 3/4) so as to thoroughly oxidize all the gxcegg of sulphides: finally use Pb0 coier if necessary. The above instructions are given with _ the supposition tha'the above admixture" of foreign minerals does not foot up more than about 15$ of the total ore. Otherwise this clagg would-gradual1y merge into Basic Ores (either oxidized or sulphides). III. BASIC onus. "'a) Oxides, carbonates. b) Oxidizing. c) sulphides. a) Oxides; such as ihe carbonate; of_ Ca, Mg, Fe, Zn, Pb, Cu. These could really be considered simply as the oxides of the metals, as the CO, is inert in a measure, and is driven off by the heat of the furnace: But.on the other hand, this escaping CO, coming not only from the ore but also from the NaHCO, contained in the fluxes, might have a tendency to create sufficient bubbling in the crucible to make the charge boil over. For this reason instead of adding the mixed R. F., flour only is added (3 1.65 gm.) when these minerals'are nearly pure. Further more, the PbO should be reduced to about 1/2...show more

Product details

  • Paperback | 36 pages
  • 189 x 246 x 2mm | 82g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236880978
  • 9781236880970