Thermodynamic consideration and phase evolution during oxidation of tungsten-copper electrical contactor scraps
IR@NML: CSIR-National Metallurgical Laboratory, Jamshedpur
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| Title |
Thermodynamic consideration and phase evolution during oxidation of tungsten-copper electrical contactor scraps
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| Creator |
Gharami, Kalpataru
Patra, H.R. Kumar, Manoj Randhawa, N S |
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| Subject |
Mathematical Modelling
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| Description |
Present studies account the feasibility studies on isothermal oxidation of W-Cu hard metal electrical contractor scraps for recycling by roasting-leaching method. This was investigated as one of main processes to produce friable oxidized product amenable to subsequent leaching process. Oxidation is facilitated using scrap turnings instead of solid W-Cu contactor rods. The alloy oxidizes to Cu (x) O, WO (x) and CuWO4 upon heating in the temperature range 400-1000A degrees C under oxygen flow. Apart from oxidized W and Cu phases, significant amount of Cu nuggets formed initially at 450A degrees C that rose gravimetrically up to 750A degrees C, and then disappeared at higher temperature. The maximum weight gain was about 22% compared to initial weight when oxidation was carried out at 750A degrees C. Oxidation beyond the temperature of 750A degrees C corresponded to significant loss of tungsten by evaporation of WO2 center dot (OH)(2) gaseous product. Thermal oxidation of W-Cu metal electrical contractor tip scraps produced porous and friable oxidized product of W and Cu.
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| Publisher |
ALLERTON PRESS INC, 18 WEST 27TH ST, NEW YORK, NY 10001 USA
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| Date |
2016-07
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| Type |
Article
PeerReviewed |
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| Relation |
DOI: 10.3103/S1067821216040039
http://eprints.nmlindia.org/7599/ |
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| Identifier |
Gharami, Kalpataru and Patra, H.R. and Kumar, Manoj and Randhawa, N S (2016) Thermodynamic consideration and phase evolution during oxidation of tungsten-copper electrical contactor scraps. Russian Journal of Non-Ferrous Metals, 57/4 (IF-0.23). pp. 361-366.
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