Recycling of Tungsten Alloy Swarf

The recycling process of Tungsten alloy (Swarf) by oxidation reduction technique have been investigated. The reduced powder was pressed under a pressure 20Kg/cm2 and sintered at 1150°C in dry hydrogen atmosphere. The particle size of the recycled alloy powder was 1-3 μm and the shape was regular at a reduction temperature 800°C. The chemical composition of the recycled alloy is the same as the primary Swarf.

Authors:

• A. A. Alhazza

Keywords:

• Recycling
• Swarf
• Oxidation
• Reduction.

References:

[1] E. Lassner and W.D. Schubert, 1999. Tungsten Properties, Chemistry,
Technology of the Element, Alloys, and Chemical Compounds, New
York, Kluwer Academic.
[2] G. D. Rieck, 1967. Tungsten and its compound, Oxford, Pergamon Press
Ltd.
[3] H. Yuehui, C. Libao, H. Baiyun and P.K. Liaw, Recycling of heavy
metal alloy turning to powder by oxidation reduction process.
International Journal of Refractory Metals and Hard Materials, 2003, 21,
227-231.
[4] V.K. Sikka and C.J. Rosa, The oxidation kinetics of tungsten and the
determination of oxygen diffusion coefficient in tungsten trioxide.
Corrosion Science, 2003, 20, P.1201-1219.
[5] J. N. Albiston and F. R. Sale, Thermogravimetric Studies of the
Hydrogen Reduction of Nickel Tungstate, Thermochimica Acta, 103
(1986) 175-180.
[6] P. Walkden and F. R. Sale ,Silver-Tungsten contacts by the hydrogen
Reduction of silver Tungstate, 28th Holm conf. On Electrical Contacts,
p. 101-107.
[7] F. R. Sale and J. N. Albiston,Production and sintering of Ag-W
composites containing Ni ,P/M Conf. ,Orlando (1988).