By Isaac Chang, Yuyuan Zhao
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Additional resources for Advances in powder metallurgy: Properties, processing and applications
During electrolysis, the impure copper is anodically oxidised to the copper ion, Cu2+, leaving most of the impurities, particularly the non-metallic ones, on the anode. The Cu2+ ion then enters the electrolyte, is transported to and is reduced to purer copper at the cathode. In principle, the process should also only separate copper from the non-metallic impurities without altering the electrolyte. It should be noted that all electrolytic processes occur in a liquid electrolyte which can be an aqueous solution containing an appropriate supporting electrolyte, such as H2SO4 + CuSO4 for copper refining, and H2SO4 + NiSO4 for nickel extraction, or a molten salt at elevated temperatures, for example, the molten mixture of Na3AlF6 (cryolite), AlF3 and Al2O3 for aluminium extraction.
Com/High_Purity_Aluminum_Powder--5211867_5211970. html (viewed on 14 June 2012). 9 G. H. Gessinger, Powder Metallurgy of Superalloys, Butterworth and Co, London, 1984.
When these processes continue, the 3PIs move along the surface of the particle until all the surface of the particle has been metallised. 2 V vs. 3 SEM images of the commercial powders of (a) Ta2O5,41 (c) MoS2,44 (e) Cr2O3,17 and (g) SiO2,45 and their electroreduction products (powders), (b) Ta,41 (d) Mo,44 (f) Cr17 and (h) Si,45 prepared under the indicated conditions. Molten CaCl2 was used in all these cases. 3(g) and (h) by permission of The Royal Society of Chemistry. the reduction continues, accompanied by the 3PIs moving along the depth direction into the interior of the oxide particle.
Advances in powder metallurgy: Properties, processing and applications by Isaac Chang, Yuyuan Zhao