Sumitomo Electric Industries, Ltd. has been adopting two methods; “zinc treatment method” and “wet chemical method” to recycle tungsten. We are using either of these methods to make the best use of its respective advantages depending on what to produce.
Zinc Treatment Method (adopted by Sumitomo Group since 1980s)
Retains constituents and recycles them into powder.
It has advantages such as “its minimized energy consumption”, “its reduced CO2“, “its eliminated use of chemicals”, and “its potential processing at small-sized facilities”, etc.
[Zn: Zinc Co: Cobalt WC: Tungsten carbide]
Wet Chemical Method (started in April, 2011 and mass-produced in October, 2011)
Recycles scrap to an intermediate tungsten material, tungsten trioxide (WO3).
It has advantages such as “its quality equivalent to ore refining” and “its wider availability (granularity)”.
Scrap From the Production Phase of Cemented Carbide Tools
It also includes scrap from a production phase of anything other than the cemented carbide tools.
(For further information on recyclable items, contact our representatives as shown below.)
Sumitomo Group provides dedicated representatives in three areas; Tokyo, Nagoya, and Osaka to support the recycling of scrap.
Thank you for your cooperation in our recycling efforts as we would like to keep on enhancing this activity.