E-Waste using no chemicals - Can it be done?

[Sancho_n_Pedro]

I was wondering, as I've been playing with my furnace just recently, If I take the obvious bits away (aluminum) and then throw everything else into my furnace, it will melt everything into a mixed metal block containing copper, steel, nickel, silver, gold.
If I put these into suitably sized blocks and use cupellation to remove all but the noble metals, would you say that this is a somewhat safer method that the wet route?

And by going this route, would you say that you should be collecting all the noble metals, or will there be losses?
Or would the suggestion be to follow the HCL route first to eliminate some of the metals to begin with?

 

[Yggdrasil]

I was wondering, as I've been playing with my furnace just recently, If I take the obvious bits away (aluminum) and then throw everything else into my furnace, it will melt everything into a mixed metal block containing copper, steel, nickel, silver, gold.
If I put these into suitably sized blocks and use cupellation to remove all but the noble metals, would you say that this is a somewhat safer method that the wet route?

And by going this route, would you say that you should be collecting all the noble metals, or will there be losses?
Or would the suggestion be to follow the HCL route first to eliminate some of the metals to begin with?

If you do a good magnetic separation after the incineration you will get rid of most of the Iron.

Still, the cupelling has its own issues regarding pollution.

There will be less waste treatment though.
Maybe better with a Copper cell?

 

[kurtak]

I was wondering, as I've been playing with my furnace just recently, If I take the obvious bits away (aluminum) and then throw everything else into my furnace, it will melt everything into a mixed metal block containing copper, steel, nickel, silver, gold.

It is not that simple !!!!!

You can not just throw some circuit boards in a furnace & expect that they will melt into a chunk of metal that can then be processed for the PMs

There is more to it - a LOT more to it

The quick answer (steps) to the process -----------

The CBs first need to be shredded (so need to be run through a knife mill or hammer mill)

The shredded CBs then need to be incinerated to turn the organics (plastics) into carbon/ash

The incinerated shredded CBs then need to be re-milled in a ball mill

After ball milling it needs to go through a sifting/screening process - this separates over sized part from above process (which needs re-processing &/or other processing) from smaller size the goes to the next process of smelting

Smelting the smaller size that goes through sifting/screening then needs to be mixed with flux to slag off organics (carbon/ash) as well as "some" metal oxides - & as well the likely addition of a "collector" metal to the smelt to insure all metals collect together & don't get hung up in the flux/slag

That is the short story - for a more complete understanding read this thread --------------

https://goldrefiningforum.com/threads/smelting.25592/

And as well watch this video (the one titled "incineration process") ---------

https://www.advchem.com/videos

Kurt

 

[Sancho_n_Pedro]

Sorry, was meaning once depopulated.

Will check them links shortly (out watching my daughter play football)

 

[Yggdrasil]

Sorry, was meaning once depopulated.

Will check them links shortly (out watching my daughter play football)

Give her some inspiring support

 

[KKRRenewables]

My daughter plays high school flag football and loves it. I swear the girls need protective equipment more than a padded helmet, they seem to want to hit each other pretty badly. Hahahaa. Good luck to your daughter!!

 

[Yggdrasil]

My daughter plays high school flag football and loves it. I swear the girls need protective equipment more than a padded helmet, they seem to want to hit each other pretty badly. Hahahaa. Good luck to your daughter!!

In the world outside the northern America, football is played with the feet
and one have no padding since no hitting, beating, pushing and likewise is allowed

 

[Manji Manii]

I was wondering, as I've been playing with my furnace just recently, If I take the obvious bits away (aluminum) and then throw everything else into my furnace, it will melt everything into a mixed metal block containing copper, steel, nickel, silver, gold.
If I put these into suitably sized blocks and use cupellation to remove all but the noble metals, would you say that this is a somewhat safer method that the wet route?

And by going this route, would you say that you should be collecting all the noble metals, or will there be losses?
Or would the suggestion be to follow the HCL route first to eliminate some of the metals to begin with?

Since you are equipped to deal with high temperature metal working, I would recommend taking the following steps.

1. Depopulate
2. Run a ceramic magnet through the material and pick up the nickel containing pieces.
3. Grind what is left into powder with a coffee grinder, use a espresso grinder.
4. Weigh the material and take equal amounts of zinc oxide and aluminum dust and mix it together. (Alternately, you can take the weight in aluminum foil plus the same in zinc oxide powder plus the grind and roll the foil with a strip of magnesium diagonally along the inside of the roll with the powder in the center, aluminum is flammable as foil.)
5. With a strip of magnesium ribbon as a fuse, put the mixture in a crucible and ignite the mixture using the magnesium fuse. Or light the fuse on the roll inside of a crucible, like you would use for iron smelting, not a little one ounce thing.

https://www.sciencedirect.com/science/article/abs/pii/S0272884217320977#:~:text=The above-mentioned values reveal,In fact,


The aluminum will burn off at a temperature in excess of the evaporation point of zinc metal leaving behind aluminum oxide and a blob of metal at the bottom of the crucible that will be predominantly silver, gold, copper and palladium. The rest will be aluminum oxide.

Just sell it as is. Somebody will pay you a lot more money than doing anything more would cost you.

If it is a smartphone, the mainboard PCB will be a gold and silver alloy, not copper, shred tablet, phone and small electronics boards and mix them in with the thermite and burn off the cellulose in the process, but this will make the mix burn hot and smokey.

As for fingers, containing a layer of gold on nickel layered on copper, believe it or not, but you can just sell those on eBay for about what you would expect to get by going through some process to extract the gold at home without chemicals.

Hope this helps, zinc oxide is cheap and aluminum foil is even cheaper and you can spend $20 in materials to extract up to 1 kilo of ewaste alloy.

 

[Yggdrasil]

Since you are equipped to deal with high temperature metal working, I would recommend taking the following steps.

1. Depopulate
2. Run a ceramic magnet through the material and pick up the nickel containing pieces.
3. Grind what is left into powder with a coffee grinder, use a espresso grinder.
4. Weigh the material and take equal amounts of zinc oxide and aluminum dust and mix it together. (Alternately, you can take the weight in aluminum foil plus the same in zinc oxide powder plus the grind and roll the foil with a strip of magnesium diagonally along the inside of the roll with the powder in the center, aluminum is flammable as foil.)
5. With a strip of magnesium ribbon as a fuse, put the mixture in a crucible and ignite the mixture using the magnesium fuse. Or light the fuse on the roll inside of a crucible, like you would use for iron smelting, not a little one ounce thing.

https://www.sciencedirect.com/science/article/abs/pii/S0272884217320977#:~:text=The above-mentioned values reveal,In fact,


The aluminum will burn off at a temperature in excess of the evaporation point of zinc metal leaving behind aluminum oxide and a blob of metal at the bottom of the crucible that will be predominantly silver, gold, copper and palladium. The rest will be aluminum oxide.

Just sell it as is. Somebody will pay you a lot more money than doing anything more would cost you.

If it is a smartphone, the mainboard PCB will be a gold and silver alloy, not copper, shred tablet, phone and small electronics boards and mix them in with the thermite and burn off the cellulose in the process, but this will make the mix burn hot and smokey.

As for fingers, containing a layer of gold on nickel layered on copper, believe it or not, but you can just sell those on eBay for about what you would expect to get by going through some process to extract the gold at home without chemicals.

Hope this helps, zinc oxide is cheap and aluminum foil is even cheaper and you can spend $20 in materials to extract up to 1 kilo of ewaste alloy.

I don't quite know how to reply to this.
Thermite creates a really strong heat and as such probably will destroy the crucible.
Next the mix needs to be in mixed powder as a foil around an unknown amount of ground powder will fizz out really fast.
The active powder(Al/ZnO in this case)need to be well mixed and relatively pure, which means you do not want to dilute the thermite itself too much with inactive elements as the thermite reaction will stall as well.
So you will end up with massive uncontrollable volcano just to melt a little motherboard dust.
So it will be like spending Dollars to receive minute amounts of cents.

There are already established and effective methods to refine boards as Kurt described further up.
And boards do not contain much more than Copper and tiny amounts of Gold and Silver.
So this is used to recover the Copper and any PMs that follow is considered a bonus.