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2011-Sustainable Industrial Processing Summit
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| Editors: | Florian K |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2012 |
| Pages: | 646 pages |
| ISBN: | 978-0-9879917-6-8 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
Electrochemical Synthesis Of Double Tungsten And Molybdenum Carbides In Tungstenate-molybdate-carbonate Melts At 1123 К
Hasbi Kushkhov1; Marina Adamokova1; Anzor Kardanov1; Elena Appaeva1;1KABARDINO-BALKARIAN STATE UNIVERSITY, Nalchik, Russia;
Type of Paper: Regular
Id Paper: 122
Topic: 9
Abstract:
The purpose of the present work is working out of new electrochemical systems for joint electroreduction of tungsten, molybdenum and carbon ions. The lithium carbonate is reduced in tungstenate melts at potential - (1.0-1.3)V. Therefore, for coincidence of carbon, molybdenum and the tungsten deposition potentials for electrochemical synthesis of double molybdenum and tungsten carbides, it is necessary to management the factors influencing for carbon speed deposited.In investigated system such factor is concentration of Li2CO3. At addition a lithium carbonate in tangstenate-molybdate melts Na2WO4-Li2WO4 (20.0 pier. %)-Li2MoO4 (5.0 pier. %) a wave of carbonates-ions reduction is appearance before a wave of joint MoO42 - and WO42 – ions reduction wave.These waves coincide in one deposition wave of joint carbon, molybdenum and tungsten at increasing of lithium carbonate concentration. We carried out the electrochemical synthesis of double tungsten and molybdenum carbides from tungstenate-molybdate-carbonate melts Na2WO4-Li2WO4-Li2MoO4-Li2CO3 on the basis of voltammetry researches of joint tungsten, molybdenum and carbon ions electroreduction. The results of X-Ray analysis of electrolysis products are show the principle possibility of double carbides of molybdenum and tungsten synthesis by electrolysis of melted system Na2WO4-Li2WO4-Li2MoO4-Li2CO3.Thus, in tungstenate-molybdate-carbonate melts carried out the processes of joint electroreduction of tungsten, molybdenum and carbon ions. The structures of cathode deposits are carried out by X-Ray methods. This work is carried out with support by the program FPP «Scientific and scientific-pedagogical personnel of innovative Russia» for 2009-2013 years.