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-0.238). pp. 361-366.
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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.
|Uncontrolled Keywords:||W-Cu alloy; thermal oxidation; tungsten oxide; copper nuggets; tungsten recycling|
|Divisions:||Metal Extraction and Forming|
|Deposited By:||Sahu A K|
|Deposited On:||16 Aug 2017 11:39|
|Last Modified:||15 Nov 2017 15:28|
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