Journal
POWDER TECHNOLOGY
Volume 253, Issue -, Pages 464-466Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.powtec.2013.11.052
Keywords
Tungsten; Nanoparticles; Molten salt synthesis; Reduction; Aluminium; Na2WO4
Categories
Funding
- EPSRC [EP/G042497/2, EP/G042497/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/G042497/1, EP/G042497/2] Funding Source: researchfish
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Tungsten (W) nanoparticles were synthesised by using a novel low temperature molten salt technique. Na2WO4 and Al were used as starting materials, and NaCl, KCl, and NaF used to form the reaction media. Among the three salts, NaF showed the best accelerating effect in the W formation. When it was used alone, phase pure W could be produced after 4 h at 850 degrees C. On the other hand, when it was combined with the other two salts (forming a NaCl-KCl-NaF eutectic salt), phase pure W nanoparticles could be produced at as low as 650 degrees C. As no water-insoluble by-product phases formed in the final samples, acid leaching which has to be used by many other techniques previously proposed, can be avoided. In addition, the by-product NaAlO2, happening to be the key intermediate product phase in the Bayer process, could be further used to prepare two important industrial materials Al2O3 and Na2CO3, adding more value to the molten salt technique developed with this work. (C) 2013 Elsevier B.V. All rights reserved.
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