i found a scrap source but...

[malikjob07]

Dear friends :
Actually i found a source of scrap, and basically it is a rolls of sim card , so i start using my solution but it eat all the gold plated, i think the gold is very very thin in there .And i left with only cooper.
Is there any other solution to get the gold out there ?
Thank you..........

 

[maynman1751]

Yes, the plating IS very thin. What did you use to dissolve the gold?

 

[malikjob07]

i'd used 2 hydrochloric acid and 1 hydrogen peroxide 10v

 

[nickvc]

I would suggest testing your solution with stannous, if you still have copper left all that's happened is you dissolved the gold which then promptly cemented back out of solution and will now be either on the bottom of your container, attached to the remaining copper or both.

 

[upcyclist]

i'd used 2 hydrochloric acid and 1 hydrogen peroxide 10v

(emphasis mine)

Were you plating it out? If you were just using Acid/Peroxide (AP) to kickstart a copper chloride etch, why mention 10 volts (assuming v=volts)? If AP, did you use a bubbler?

 

[FrugalRefiner]

I suspect he meant 10 volume.

Dave

 

[upcyclist]

I suspect he meant 10 volume.

I'm still lost, then 10 liters?

 

[UncleBenBen]

Probably as in 10% concentration of H₂O₂?

 

[FrugalRefiner]

No, 10 volume H₂O₂ is 3%. Check Google.

Dave

 

[UncleBenBen]

Good god, Dave! Thanks for thumping the brain flatulence out of my head! I did Google that last weekend at Sally's beauty supply with the wife.

Any body know where a guy can buy some new brain cells?

 

[malikjob07]

10 volume H2O2 is 3%

 

[MarcoP]

Any body know where a guy can buy some new brain cells?

I'm looking to change my cells too, I've tried scrapyard for used ones without luck and new ones are impossible to find. I think we should take care of the few left working cells we have!

Marco

 

[FrugalRefiner]

Check silversaddle's post about a third of the way down in Where are all the pictures!!.

Dave

 

[malikjob07]

any help for me

 

[FrugalRefiner]

As Nick said, if you still have copper left as a metal, any gold that was dissolved has probably cemented out and is now mixed with the remaining copper. I assume your goal was to create some CuCl₂ (aka AP) solution. We've learned over the years that you only need a tiny amount of H₂O₂ to start the process, not a 2:1 ratio. I only use a capful of H₂O₂ when starting a new batch, and I put some plain copper wire in to consume the peroxide. Then you can add your gold plated material with less danger of dissolving the gold.

Another way of processing them would be to use nitric acid to dissolve the copper, leaving the gold behind.

For your current batch, add an air bubbler and let the process continue till all the copper has been dissolved. The gold should remain as a very fine powder.

Dave

 

[malikjob07]

Thank you Dave

 

[jason_recliner]

malikjob07,
Just to hammer home one point on the sage advice already given:

Because you have dissolved some or all of your gold, and as has already been mentioned that it will have been cemented out again as a fine brown powder, you should let your leach keep running until all the copper is dissolved. Every bit. It's not good enough to just have clean copper visible and to think you can skip to the end.

This is because some of the gold could have cemented on the rear surfaces of the copper where you can't get at it.