Sciencemadness Discussion Board

CRT Lead and Phosphor Extraction.

9CWAI - 23-1-2022 at 19:11

I would like to know if using iron/carbon to extract lead from molten CRT is feasible. Electricity is cheap and I have an excellent kiln that can maintain twice the melting point of lead glass.

Is using a graphite crucible is recommendable, or if I should make a ceramic (one comparable to porcelain) one.

I would also like to know if separating the individual metals in the phosphor is easily done and if so how you would recommend.

9CWAI - 23-1-2022 at 19:13

Also if I can and how I could extract barium and strontium from the panel glass would be cool too.

[Edited on 24-1-2022 by 9CWAI]

9CWAI - 23-1-2022 at 19:36

and is there any way to turn a CRT into an electron gun? I am using broken pieces I found in the desert before I break a single one.

Heavy Walter - 24-1-2022 at 14:51

Hi, lead quantity in lead glass is really small!
Components of the phosphor screen may be recovered, and again, not too much metals in there. Is better to keep them as phosphorescent substances.
Finally, the electron gun from the CRT may be reused. I read about oxide cathodes (those typical in CRT guns) recovered after atmosphere exposure.

9CWAI - 24-1-2022 at 20:58

Quote: Originally posted by Heavy Walter  
Hi, lead quantity in lead glass is really small!
Components of the phosphor screen may be recovered, and again, not too much metals in there. Is better to keep them as phosphorescent substances.
Finally, the electron gun from the CRT may be reused. I read about oxide cathodes (those typical in CRT guns) recovered after atmosphere exposure.

The glass is between 30% and 40% lead by weight and running my furnace is cheap and easy, I wasn't asking if it was worth it but if doing it was possible to get a high percent yield.

Heavy Walter - 25-1-2022 at 16:07

Agree about lead quantity! I relied in my memory...
Surely there is a way to recover it. The main is as oxide.
Not sure about high %.

Heavy Walter - 25-1-2022 at 16:07

Agree about lead quantity! I relied in my memory...
Surely there is a way to recover it. The main is as oxide.
Not sure about high % recovery.



[Edited on 26-1-2022 by Heavy Walter]

beta4 - 26-1-2022 at 04:16

Quote: Originally posted by 9CWAI  
and is there any way to turn a CRT into an electron gun? I am using broken pieces I found in the desert before I break a single one.


If the CRTs are very old, be careful, as some of the first B/W CRTs used beryllium in their phosphors (source: http://www.labguysworld.com/crt_phosphor_research.pdf)