I have grown a single crystal by flux method using tantalum crucible. I want to recycle the ta crucible, but in ta crucible , there are some Ce compounds I used. So, I heated up and put out the ta crucible with high temperature furnace ; Box furnace, at 1000℃ to get rid of the compounds as being liquid. But it is failed.
So, I need help somebody know about the ta crucible or Ce compounds; acid treatment, heating again, or any method is ok.
thant you for reading.
you could using concentrated hydrocloric acid to clean the Ta crucible. you could also heat the acid. If it does not work, try nitric acid even aqua regia
You may consider cleaning the tantalum crucible with conc. HNO3 aq.; from room temperature (≥20 wt%) to hot or boiling (5 wt%); being that possibly followed by conc. aq. sol. of H2SO4. You could alternatively consider cleaning with aq. conc. mixture of both acids.
Thank you for really good reply and respect.
I try to do acid treatment but a little worrying that ta crucible is damaged by acid
could it be ok?
Also, I think that final method is grinding inner surface of ta crucible to clean up ta crucible.
How about this method ??
So much thank you.
Best
Ta is inert to aImost all acids. lt is not recommended to use mechanic methods to avoid damage
So, it means grinding is not good to clean up ta crucible?
as soon as possible, I plan to the acid treatment with HCl or HNO3 or aqua regia.
If there is damaged surface on Ta crucible after acid method, I think I will grind the inner
surface of Ta crucible.
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