Enrichment of W2B5 from WO3 and B2O3 by Double SHS Method
<p>A second self-propagating high-temperature synthesis (SHS) was carried out to enrich the W<sub>2</sub>B<sub>5</sub> content in the SHS product containing a mixture of various tungsten boride compounds. In the experiment, the process called Double-SHS (D-SHS) was cond...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Kaunas University of Technology
2018-02-01
|
| Series: | Medžiagotyra |
| Subjects: | |
| Online Access: | http://matsc.ktu.lt/index.php/MatSc/article/view/17834 |
| Summary: | <p>A second self-propagating high-temperature synthesis (SHS) was carried out to enrich the W<sub>2</sub>B<sub>5</sub> content in the SHS product containing a mixture of various tungsten boride compounds. In the experiment, the process called Double-SHS (D-SHS) was conducted in two steps. In the first SHS reaction, an initial molar composition ratio of WO<sub>3</sub>:B<sub>2</sub>O<sub>3</sub>:Mg mixture was selected as 1:3:8. The product was then hot-leached with hydrochloric acid to eliminate MgO and Mg<sub>3</sub>B<sub>2</sub>O<sub>6</sub> phases. The leached product, consisting of 72.6 wt.% W<sub>2</sub>B<sub>5</sub>, 16.1 wt.% WB, 8.4 wt.% W<sub>2</sub>B, and 2.9 wt.% W, was again reacted with the Mg and B<sub>2</sub>O<sub>3</sub> mixture by second SHS. After another acid leaching step, W<sub>2</sub>B<sub>5</sub> content in the D-SHS product was found to be 98.2 wt.%. The study showed that D-SHS is an effective method for boron enrichment in the tungsten compounds.</p><p>DOI: <a href="http://dx.doi.org/10.5755/j01.ms.24.1.17834">http://dx.doi.org/10.5755/j01.ms.24.1.17834</a></p> |
|---|---|
| ISSN: | 1392-1320 2029-7289 |