So I Made about 10 gallons of AR over the weekend and managed to recover a decent amount of gold out of the unprocessed circuit boards by direct AR
dissolution then precipitate with OTC sodium dithionite. Pictures will be in this week(end) and I will see if I can upload a few videos from my
YouTube channel which I will have linked once vids are uploaded. Now once my material is incinerated with a setup I will end up taking a picture of
later this week and washed with water to get rid of water soluble stuff and light ash, what's the best way to go about getting rid of the rest of the
impurities i.e. ceramics, base metals, etc? Also, before you groan at the fact I am bringing up a similar subject that ended up in detris for going
off the rails, I intend on keeping it on track as I only have a few questions. One Where to go with it next, is there a way to remove ceramics without
HF, and how do I separate the PM's after precipitated with dithionite as I have a lot of powder. My tote has almost an inch of powder coating the
bottom which is about 1.5 square feet. Melgar - 22-5-2017 at 08:29
Yup. I wish I lived in an industrial park instead of a
residential community. That would make life way easier as a waste shredder would make life way easier as I wouldn't have so much plastic to deal with.
Some has to be destroyed by extreme heat provided by charcoal with a 110CFM shop vac outlet and the rest must be destroyed with piranha solution or a
equally strong oxidizer such as manganese heptoxide which I would like to avoid if possible. Maybe a container of molten NaOH would also help to
remove glass and other things. I am aware I could use Na2CO3 to destroy glass but it requires temperatures only achievable with my furnace which I ran
out of propane for. Certainly helps to have anhydrous magnesium sulfate to increase the reaction lifetime of the solution by sucking out water in the
event I opt to use piranha. ninhydric1 - 28-5-2017 at 15:10
If there are still base metals in there, you could try using a mixture of HCl and hydrogen peroxide. I'm not sure if it will work with the ceramics
and the other miscellaneous material. Copper and nickel are commonly found in computer scrap, and since HCl isn't strong enough to "dissolve" those
metals, hydrogen peroxide is used. IIRC it should also work with iron and silver. Correct me if I'm wrong.Melgar - 28-5-2017 at 15:35
Silver chloride is insoluble in water, and would form a protective coating on any silver metal. Also, I'm fairly certain that HCl/H2O2 can dissolve
palladium, and possibly gold (slowly though).
For a shredding machine, they rent them out to places that have a lot of bulky crap that they want to get rid of too. Here's the portable version,
though I imagine you don't have enough funds to afford to rent it:
So I Made about 10 gallons of AR over the weekend and managed to recover a decent amount of gold out of the unprocessed circuit boards by direct AR
dissolution then precipitate with OTC sodium dithionite.
What happens with all the waste water?The jersey rebel - 5-6-2017 at 04:19
the waste was treated with iron to cement out the copper and residual PMs and then saturated with bicarbonate to make a chunky solid I can then
dispose of in regular trashMelgar - 5-6-2017 at 07:59
Cement would probably be a cheaper base if you have any more to get rid of.The jersey rebel - 5-6-2017 at 17:45
maybe. However I can get bicarb in bulk so it's much cheaper for me. connections to local plants is very helpful
