Thorium from 4% tig welding rod

[Sam33]

Hi 

Are there any way to extract thorium dioxide from the welding rod ? Without the tungsten contamination.  There is of course the h2o2 method.  But are there any better way ?

Thanks in advance

[Sam33]

I found a way 

1- electrolysis the electrodes in 7.5 mol NaOH solution. 

2-  filter the participate powder. 

3- Wash  it with distilled water 

4- add H2O2 37%  and leave it for a day

5- wash with 25% ammonia solution 

6- filter the powder. 

Done.

According to this method, in 1 liter of 7.5 M (30%) aqueous solution of sodium hydroxide was dissolved  electrodes with a total mass of 300 g. For oxidation and neutralization it took 150 ml and 25 ml of aqueous solutions of hydrogen peroxide (37%) and ammonia (25%), respectively. Thorium oxide obtained 5.7 g, which is 1.9%. This is 95% of expected.

Found it in some Russian site with pictures 

Translate with Google if you are interested 

Vydelenie_oksida_toriya_iz_torirovannyh_volframovyh_elektrodov-1.pdf

Edited December 6, 2019 by Sam33
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