Enrichment of W2B5 from WO3 and B2O3 by Double SHS Method


Derin B. , Yazici S.

MATERIALS SCIENCE-MEDZIAGOTYRA, vol.24, no.1, pp.35-38, 2018 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 24 Issue: 1
  • Publication Date: 2018
  • Doi Number: 10.5755/j01.ms.24.1.17834
  • Title of Journal : MATERIALS SCIENCE-MEDZIAGOTYRA
  • Page Numbers: pp.35-38

Abstract

A second self-propagating high-temperature synthesis (SHS) was carried out to enrich the W2B5 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 WO3:B2O3:Mg mixture was selected as 1:3:8. The product was then hot-leached with hydrochloric acid to eliminate MgO and Mg3B2O6 phases. The leached product, consisting of 72.6 wt.% W2B5, 16.1 wt.% WB, 8.4 wt.% W2B, and 2.9 wt.% W, was again reacted with the Mg and B2O3 mixture by second SHS. After another acid leaching step, W2B5 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.