Does copper only knock out gold or does it also knock out silver?

[ólom]

So your plan is to dissolve Silver and Pd first and then Gold?
If you drop Silver first by AgCl and then cement out Pd on Copper, you should have relatively good separation.
Then you can go for the Gold.

Yes, that's the plan. Then silver should be dropped first and then palladium with copper?

 

[Yggdrasil]

Yes, that's the plan. Then silver should be dropped first and then palladium with copper?

If you try Copper first it will drop both.

 

[ólom]

If you try Copper first it will drop both.

I meant to drop silver with salt followed by palladium with copper. Do it this way?

 

[Martijn]

I meant to drop silver with salt followed by palladium with copper. Do it this way?

Yes.

 

[ólom]

Thank you for your help!

 

[J.Najam]

It works best with as small bubbles as possible and they need about 9 seconds of contact with a wetted surface.

How exactly do we know that the entrapped gasses are spending this much time in the container? Is there a way to actually control this? And what's the tell that we're making these gases spend enough time in the liquid before them moving on to the next phase?

 

[Martijn]

How exactly do we know that the entrapped gasses are spending this much time in the container? Is there a way to actually control this? And what's the tell that we're making these gases spend enough time in the liquid before them moving on to the next phase?

Very good question. I would also like to know.
'Enough' is enough and that all depends on a lot of variables like amount of gases expelled.

Like 'enough' nitric in you AR. It depends.

Stay on the safe side, don't produce big clouds of gas and you have very little to scrub.
Experience is a big factor here.
You can leach a block of copper and have no BFRC but when you add copper dust to the same mix, it boils over.

 

[Yggdrasil]

How exactly do we know that the entrapped gasses are spending this much time in the container? Is there a way to actually control this? And what's the tell that we're making these gases spend enough time in the liquid before them moving on to the next phase?

Experiense and maybe calculations has given the result that in order to scrub a gas clean,
it need to be in contact for about 9 second with a wetted surface or in a liquid.

 

[J.Najam]

Very good question. I would also like to know.
'Enough' is enough and that all depends on a lot of variables like amount of gases expelled.

Like 'enough' nitric in you AR. It depends.

Stay on the safe side, don't produce big clouds of gas and you have very little to scrub.
Experience is a big factor here.
You can leach a block of copper and have no BFRC but when you add copper dust to the same mix, it boils over.

Very well noted and understood and thanks for your reply.

I will have alot to work around before I can try something out I guess.

I may post some examples in one of the original scrubber threads of what Im thinking after going through all the posts. I most certainly may be wrong in my approach so please do feel free to correct me there.

Thanks.

 

[J.Najam]

Experiense and maybe calculations has given the result that in order to scrub a gas clean,
it need to be in contact for about 9 second with a wetted surface or in a liquid.

Any non chemical compounds you think I can experiment with to enhance my knowledge? For instance if i Burn charcoal or wood in a container(not in a beaker) and somehow pull the the gasses into a scrubbing vessel.. you think Ill be able to grasp and understand the concept of how it may be possible to enforce the retention time of the gasses in the liquid (Liquid being water only)?

 

[Yggdrasil]

Any non chemical compounds you think I can experiment with to enhance my knowledge? For instance if i Burn charcoal or wood in a container(not in a beaker) and somehow pull the the gasses into a scrubbing vessel.. you think Ill be able to grasp and understand the concept of how it may be possible to enforce the retention time of the gasses in the liquid (Liquid being water only)?

Retention time in a liquid is the time the bubble need to move from where it appears, to the surface.
Or the time it need to go from the inlet of a scrubber to the outlet.
There is obviously no fixed time for that. It is a function of volume and speed of the gases produced compared to the distance and volume of the scrubber.

 

[Yggdrasil]

Any non chemical compounds you think I can experiment with to enhance my knowledge? For instance if i Burn charcoal or wood in a container(not in a beaker) and somehow pull the the gasses into a scrubbing vessel.. you think Ill be able to grasp and understand the concept of how it may be possible to enforce the retention time of the gasses in the liquid (Liquid being water only)?

If you have a bottle of compressed air, you can bubble that through a column of water and see.

 

[J.Najam]

Retention time in a liquid is the time the bubble need to move from where it appears, to the surface.
Or the time it need to go from the inlet of a scrubber to the outlet.
There is obviously no fixed time for that. It is a function of volume and speed of the gases produced compared to the distance and volume of the scrubber.

Wow! It couldn't be more aptly put! Many thanks!

Bottle of compressed air.. an air tight jar would do? i could cut a circle in its cap, insert a pipe and silicone it off to initiate a process. If thats what you mean

 

[J.Najam]

If you have a bottle of compressed air, you can bubble that through a column of water and see.

How many Litres is recommended at best?

 

[Yggdrasil]

Wow! It couldn't be more aptly put! Many thanks!

Bottle of compressed air.. an air tight jar would do? i could cut a circle in its cap, insert a pipe and silicone it off to initiate a process. If thats what you mean

No.
A compressor with air tank or a car tire with a hose to the valve will do. But that is hard to control.

 

[Martijn]

Any non chemical compounds you think I can experiment with to enhance my knowledge? For instance if i Burn charcoal or wood in a container(not in a beaker) and somehow pull the the gasses into a scrubbing vessel.. you think Ill be able to grasp and understand the concept of how it may be possible to enforce the retention time of the gasses in the liquid (Liquid being water only)?

How much are you planning to process? And which processes? How fast is it needed to complete?
You need to be able to scrub what you produce. No more.

 

[J.Najam]

compressor with air tank

expensive

a car tire with a hose to the valve will do

doesn't seem practically possible, sorry

 

[J.Najam]

How much are you planning to process

a few hundred grams to a kilo for either of the aforementioned

And which processes

The same I guess, leading fumes from a reaction vessel to the scrubber

How fast is it needed to complete

Not sure about this

 

[Yggdrasil]

expensive

doesn't seem practically possible, sorry

Most new cars have a compressor to refill the tires in stead of a spare tire.
Good for testing only.
How much are you going to process at a time?
The setup I posted earlier can take quite a bit of fumes, and to increase the retention time,
you can increase the amount of bottles between the vacuum source and the reaction vessel.
If you use a water Peroxide mix in the first or two first bottles you can reclaim most of the brown fumes as dilute Nitric.
Just make sure to have one bottle of NaOH solution and ideally an empty bottle as the last and one.

 

[Yggdrasil]

This is easy if you have running water with decent pressure.
If not, a largeish tank, a 50-200 L drum might do and then a pressure pump and an e-ductor vacuum generator.
This will be relatively cheap and needs only electricity to run.