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kjavanb123

Well-known member
Joined
Apr 1, 2009
Messages
1,743
Location
USA
Hi

I was given 10.430 kg of telecomm boards made by DSC communication company.

So far I have depopulated and processed gold fingers and what I think is called a swtich from these boards.

Here is the recovered gold for each parts.

These are the boards
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These are the gold fingers removed manually
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So that makes the yield for these types of gold fingers to be 3.37 grams per kg (1.52 grams per lb)
 
I am not sure what is the technical term for thjs item but maybe a switch?

They had a tiny contact points that were gold plated or alloyed.

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Dissolved in warm dilute nitric acid
 
Continued processing the undissolved pieces in AR. It rather dissolved quickly.
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These are the contact points that were clipped and used for the above process.
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I did the sulfamic acid treatment and then tried to drop the gold with SMB no visible sign of gold yet, but stannous chloride shows weak Platinum.

Also recovered silver which is very small and fine.

So no measurable quantities from these dwtiches but their contact points has gold platinum silver and tin.
 
Good work. Very well organized documentation of the process and your results.

Thanks

Sent from my SM-G950U using Tapatalk

 
The yellow colour switch is called relay
The points mostly end with palladium with gold plating
 
Don not forget about the red and blue with two position.....is called DIP switch...and get fair amount of Au from those. With the white lever....between ON an OFF position.
In the second picture you have 4 pieces in the right all red and a multiple one in upper side with blue colour.
 
sena said:
The yellow colour switch is called relay
The points mostly end with palladium with gold plating

Thanks for your clearification. I will check the nitrate solution for Pd.
 
johnny309 said:
Don not forget about the red and blue with two position.....is called DIP switch...and get fair amount of Au from those. With the white lever....between ON an OFF position.
In the second picture you have 4 pieces in the right all red and a multiple one in upper side with blue colour.

Thank you. Yes I already processed those in a different batch, some of those DIP switches have balls of gold or gold plated. Other ones have gold plated pins.

There are other components with gold I am processing them and will post them here.
 
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