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Metallurgical Analysis and Assaying; A Three Years' Course for Students of Schools of Mines

Metallurgical Analysis and Assaying; A Three Years' Course for Students of Schools of Mines


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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1903 Excerpt: ...has been thoroughly reduced. Time and labour are necessary to attain this end. Transfer "5 gm. finely reduced ore to a 25 c.c. platinum crucible. Mix with 10 gms. KHS04 and fuse over a good bunsen, commencing with a low flame and gradually raising the temperature. At the end of thirty minutes add 5 gms. anhydrous Na2COs and 1 gm. KNOg and fuse for another thirty minutes. For the last fifteen minutes a full red heat should be maintained. On cooling, swirl the 'melt' up the sides of the crucible. When cool, transfer to a 300 c.c. beaker. Add 100 c.cs. water and digest till the melt is dissolved. Acidulate the solution (after removing and rinsing the crucible) with 16E. HC1. Evaporate to dryness in a porcelain dish. Take up with 10 c.cs. E. HC1 and 50 c.cs. water. Filter and wash well with hot water. Reserve the precipitate. Evaporate the filtrate to dryness; take up as before and filter. This double evaporation and filtration is necessary to remove all the silica, which is estimated gravimetrically as usual. FeO, Al2Os.--Evaporate the combined filtrates from the SiO,2 precipitations to about 150 c.cs. Add to the solution 15 c.cs. absolute alcohol and boil till the chromium is reduced to the chromic state (the alcohol is at the same time oxidised to aldehyde). Boil off the excess of alcohol (test by smell) and add a slight excess of 5E. NH4HO. This precipitates Al0(HO), j, Fe2(HO)0, and Cr2(HO)6. There will probably be sufficient NH4C1 "present to prevent the precipitation of any magnesium salts present. If in doubt, dissolve the precipitate in excess of HC1 and reprecipitate with NH4HO. Combine the nitrates and reserve the combined filtrate. Transfer the dried precipitate to a platinum crucible and fuse with about 2 gms. Na2COs and 1 gm. KNOa. Fuse ti...


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Product Details
  • ISBN-13: 9781231202623
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 164
  • Spine Width: 9 mm
  • Width: 189 mm
  • ISBN-10: 1231202629
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 304 gr

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Metallurgical Analysis and Assaying; A Three Years' Course for Students of Schools of Mines
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