Touchpad mylars

[kjavanb123]

All,

During manual dismantling 1680lbs of mixed telecomm boards, there were almost 280g of mylars which I am guessing is used beneth the touchpad of digital telephones. I got 0.6g of silver button. My process choice was, incineration, ball milling, dissolving the tiny silver buttons during the incineration in dilute nitric, precipiated silver metal using copper cementation, melt and purified the button which had some copper contaminqtion with 10% sulfuric acid.

Touchpad mylars,


Incinerated, ball milled, and removed the plastics, ready to be dissolved in nitric,


Dissolved the above materials in nitric, precipitated silver elements with copper,


Cemented silver contaminated with excessive copper nitrate crsystals,


Final button, after melting the contaminated silver and purifying it with dilute sulfuric acid,


Best regards,
Kevin

 

[Smack]

Explain how you incinerated using any percentage of HNO3 and how to purify melted silver with 10% H2SO4.

 

[kurtak]

Explain how you incinerated using any percentage of HNO3 and how to purify melted silver with 10% H2SO4.

I think Kevin miss typed what he was meaning to say when he said --- "My process choice was, incineration, ball milling, dissolving the tiny silver buttons during the incineration in dilute nitric"

If you look at the second picture it says --- "Incinerated, ball milled, and removed the plastics, ready to be dissolved in nitric,

Therefore I believe he meant --- dissolving the tiny silver buttons after the incineration in dilute nitric (instead of during) in the first above quote

Kurt

 

[kjavanb123]

Opps sorry about bad grammer over there, yes I meant after incineration completed I ran the materials in a ball mill to liberate tiny buttons of silver that were produced during incineration and got stuck to the plastic ashes.

As you see in my picture there are a lot of tiny silver buttons and some other materials i believe there were some ashes and some copper which was in the ball mill, so I dissolved silver buttons in dilute nitric 50%.

Filtered the above solution, insert an ingot of copper and immidately reaction started and silver metal cemented as you see in the picture.

I left the reaction over night, and it was complete, but there were some dark green crystals also in the mix of silver gray powder, so I decided to melt the mix powder and then use dilute sulfuric acid (10%) to dissolve the contaminated copper and this shiny button cam out.

Regards,
Kevin

 

[Smack]

That 10% H2SO4 would only clean the surface of the silver, not inside.