Low temperature preparation of tungsten nanoparticles from molten salt
Low temperature preparation of tungsten nanoparticles from molten salt
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DOI：
10.1016/j.powtec.2013.11.052
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发表时间：
2014-02-01
影响因子：
5.2
通讯作者：
Zhang, Haijun
中科院分区：
文献类型：
--
作者：
Zhang, Shaowei;Wen, Yan;Zhang, Haijun
采用一种新型的低温熔盐技术合成了纳米钨。以Na2WO4和Al为起始原料，以氯化钠、氯化钾和氟化钠为反应介质。在三种盐中，NaF对W形成的促进作用最好。当单独使用时，在850℃下4h即可得到物相纯的W，而当它与其他两种盐(形成氯化钠-氯化钾-氟化钠共晶盐)联合使用时，可在低至650℃的温度下生成物相纯的W纳米颗粒，因为在最终样品中不会形成水不溶的副产物相，避免了以前提出的许多其他方法所必须使用的酸浸。此外，副产物NaAlO2是拜耳法的关键中间产品相，可进一步用于制备两种重要的工业材料Al_2O_3和Na_2CO_3，为与本工作一起开发的熔盐技术增加了更多的价值。(C)2013爱思唯尔B.V.保留所有权利。
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.