Reduction of Ammonium Paratungstate Generated During Hydrometallurgical Processing of Copper-Tungsten(W-Cu) Borings
IR@NML: CSIR-National Metallurgical Laboratory, Jamshedpur
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Title |
Reduction of Ammonium Paratungstate Generated During Hydrometallurgical Processing of Copper-Tungsten(W-Cu) Borings
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Creator |
Kumar, Manoj
Sau, D C Nishant, P Bhattacharya, Maitreyee |
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Subject |
Minerals and Mining
Waste Management |
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Description |
Tungsten-copper (W-Cu) alloy is employed for manufacturing heavy duty contactors, relays,
switches etc. During production of such components, W-Cu turnings/borings are generated
At CSIR-NML, a process for recovering tungsten and copper from tungsten-copper borings
containing 46.01% W, 53.78% Cu, 0.13% Fe and other minor metals as high purity tungsten
powder and copper powder has been developed In the present work, the detailed
investigation on reduction of ammonium paratungstate (APT) having purity 99.95% by
hydrogen gas to produce the high purity tungsten powder was presented. The various process
parameters such as temperature, time and flow rate of hydrogen gas were optimized At the
temperature of 8000C and 0.1 lpm flow rate a reduction of 77.78% was observed up to 2h
time. At 9000 C, with increase in flow rate from 0.1 lpm to 0_3 lpm the increase in reduction
was found to be from 63.88% to 99.99% at 1h time. At still high temperature of 1000°C,
almost complete reduction was obtained at 0.1 lpm flow rate in 1h time. The effect of beddepth
was also carried out. At all temperatures chemical reaction and nucleation control
were the rates determining steps.
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Date |
2013-07
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Type |
Conference or Workshop Item
PeerReviewed |
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Format |
application/pdf
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Identifier |
http://eprints.nmlindia.org/7169/1/D.C.Sau.pdf
Kumar, Manoj and Sau, D C and Nishant, P and Bhattacharya, Maitreyee (2013) Reduction of Ammonium Paratungstate Generated During Hydrometallurgical Processing of Copper-Tungsten(W-Cu) Borings. In: 17 th International Conference on Non-ferrous Minerals and Metals 2013, 5-6 July, 2013, Ranchi. |
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Relation |
http://eprint.nmlindia.org/7169
http://eprints.nmlindia.org/7169/ |
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