C - Chemistry – Metallurgy – 01 – G
Patent
C - Chemistry, Metallurgy
01
G
23/251
C01G 41/00 (2006.01)
Patent
CA 1255473
D-85-2-114 ABSTRACT A process is disclosed for producing ammonium tetrathiotungstate. The process involves reacting an ammoniacal tungstate solution with hydrogen sulfide gas, the solution and the gas being in a closed system and the flow of the gas being regulated at an elevated pressure to form a slurry consisting essentially of a solid essentially all of which is ammonium tetrathio- tungstate containing a portion of the starting tungsten and a mother liquor containing the balance of the tungsten. The slurry is then cooled to ambient temperature and the solid is removed from the major portion of the mother liquor. The solid is then washed with water and with alcohol followed by removal of the resulting respective water and alcohol washes to remove the remaining portion of the mother liquor and soluble impurities from the solid. The resulting washed solid is then dried at ambient temperature to form the final ammonium tetrathiotungstate. -11-
515872
Hoffman Henry E.
Munn Robin W.
Reilly Kenneth T.
Gte Products Corporation
R. William Wray & Associates
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