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Extraction of Tungsten from Ores

Public Domain


Details

  • Personal Author:
  • Description:
    Tungsten is recovered from refractory ores by roasting, rapidly quenching, and leaching. Thus, a w ore containing 1.63 pct wo3, particle size 65 pct -325 mesh, was heated at 800 deg c for 2 h and immediately poured into a rapidly agitated aqueous solution of naoh 2.5 and na2co3 2.5 pct. The mixture was transferred to an autoclave and leached at 200 deg c and 200 psi for 2 h. The mixture was cooled and filtered, and 95 pct of the w was extracted from the ore. Chem. Abstr. 91:161,036K (see also chem. Abstr. 90:190,325P) tungsten is recovered from hot-springs tungsten ores (blanketlike deposits and veins underlying beds of calcareous tufa). The ores are calcined at 800 deg-950 deg c, quenched in a solution of naoh and na2co3, and leached in an autoclave at 180 deg-300 deg c and 200- 500 psi. Thus, w ore was calcined at 900 deg c for 2 h and quenched in a solution of naoh 2.5 and na2co3 2.5 Wt pct. The mixture was transferred to an autoclave and reacted at 200 deg c and 300 psi for 2 h. After filtering and washing, the leach solution contained 95 pct of the initial wo3. [Description provided by NIOSH]
  • Subjects:
  • Series:
    Mining Publications
  • Document Type:
    Text
  • Genre:
    Other
  • CIO:
    National Institute for Occupational Safety and Health (NIOSH)
  • Division:
    RERC - Reno Research Center
  • Topic:
    Workplace Safety & Health
  • Location:
    North America
  • Pages in Document:
    3 pdf pages
  • NIOSHTIC Number:
    nn:10011943
  • Citation:
    U S Pat 4 167 555 Sept 11 1979 :
  • Federal Fiscal Year:
    1979
  • Peer Reviewed:
    False
  • Source Full Name:
    U.S. Pat. 4,167,555; Sept. 11, 1979; Chem. Abstr. 90:190,325P
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:40b74c1732d54679dabb1282e714281009f656e6cefad77d9fe0cf5c9c81a1544bd26a9ab64117b1778a456e1a5b154e7d891384414ab2afe06bd49aa51cd8a3
  • Download URL:
  • File Type:
    Filetype[PDF - 232.17 KB ]
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