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Recycling of Secondary Tungsten Resources

  • Devabrata MishraEmail author
  • Shivendra Sinha
  • Kamla Kanta Sahu
  • Archana Agrawal
  • Rakesh Kumar
Technical Paper

Abstract

Tungsten and its alloys find critical applications in several important sectors, such as defence, aerospace, mining, manufacturing, telecommunications etc., which are key to economic development and national security. Global tungsten deposits are limited (~3.3 million tonnes) and highly localized; China dominates the supply with more than 84% share. India doesn’t have any economic tungsten ore deposits, and produces meagre quantities of tungsten in comparison to its demand of ~1500 tonne/year. In order to lessen the import burden and supply risk to the country’s defence programmes, India is required to focus on producing this important metal from various available secondary and lean grade resources such as scraps and tailings. This article presents some of the recently developed and commercialized tungsten recycling technologies by CSIR-NML, which include: (1) recycling of tungsten carbide (WC) hard metal scraps for production of high pure yellow tungsten oxide (WO3) and W-metal powder; and (2) production of high pure sodium tungstate (Na2WO4·2H2O) from spent hydro-refining catalysts. Besides describing the process flow-sheets and product specifications, the paper highlights the advantages of CSIR-NML technologies over the presently practiced technologies.

Keywords

Tungsten scrap Yellow tungsten oxide (YTO) Sodium tungstate Tungsten metal powder 

Notes

Acknowledgements

The authors are thankful to various sponsors and entrepreneurs for their financial support, deep involvement and finally commercialising the developed knowhow. The authors are also thankful to Director, CSIR-NML for giving permission to publish this article.

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Copyright information

© The Indian Institute of Metals - IIM 2016

Authors and Affiliations

  • Devabrata Mishra
    • 1
    Email author
  • Shivendra Sinha
    • 1
  • Kamla Kanta Sahu
    • 1
  • Archana Agrawal
    • 1
  • Rakesh Kumar
    • 1
  1. 1.Metal Extraction and Forming DivisionCSIR - National Metallurgical LaboratoryJamshedpurIndia

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