C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 34/36 (2006.01) C01B 31/34 (2006.01) C01G 41/00 (2006.01)
Patent
CA 2176179
Tungsten carbide and/or tungsten can be recycled by oxidizing the tungsten composition at a temperature greater than 700°C to form a water insoluble tungsten trioxide. This is then reduced to form tungsten dioxide. The tungsten dioxide is subjected to a low temperature oxidation which forms monoclinic tungsten trioxide. The monoclinic tungsten trioxide is then dissolved in ammonia to form ammonium tungstate. If present, the binder metal such as cobalt is converted into the soluble ammine complex. This can be spray dried and carburized to form tungsten carbide. If the form composition includes cobalt or other binder metal, the ratio of cobalt to tungsten can be adjusted by adding cobalt salts or ammonium metatungstate to the aqueous solution prior to spray drying to form a precursor composition. This is uniquely suitable for forming a cobalt tungsten carbide composition.
Seegopaul Purnesh
Wu Li
Macrae & Co.
Nanodyne Incorporated
LandOfFree
Reclamation process for tungsten carbide and tungsten-based... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Reclamation process for tungsten carbide and tungsten-based..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reclamation process for tungsten carbide and tungsten-based... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1386176