So, For this 1st batch , I've use
500ml of distilled water, (I now use tap water for this step)
25g of EcoGoldex
Heat and stir at 80oC >30min
Eco goldex never completely dissolve, and Magnetic stirrer couth a lot of Magnetic material. "Iron Dust?"
These 2 seems to be expected , even if ecoGoldex do not really addresses these.
I've filter the solution , This doesn't seem absolutely necessary.
Filter with coffee filter still give cloudy solution
Filter with lab filter still give Cristal clear orange solution
Ive process about 1800g of gold plated pins.
This toke about 2min on the first pins , and about 20-30 min for the last ones.
My pins finished with a nickel color After gold is removed , So there must be another metal before the cooper.
All my pin were cleans , and nothing else was process on this 1st batch
From my personal experience , this was incommoding ,
I got some of the Cyanide poisonings symptoms, even if working outside , with gloves. Mild headache, and mild dizziness. Gold bearing material manipulation force you to be close to the solution
Once liquid is saturated , and items out of it
I've adjust the PH off the solution Sulfuric acid (new battery acid (~30%)) ,
it took 38g to bring ph to about 2, Instruction calls for 1 to 4
Old EcoGoldex call for different PH
This may bubble-out , use big container !
This May cause toxic fume, do in fume hood
I've Ad 2.5g of fine zinc Powder, and mix, to precipitate gold
I've let sit the solution for about 4 days, Stirring from time to time
Fine Filter, keep solid
I've tested the liquid with Stannous Chloride , Test was negative , But I now think it was false Negative
See this tread Stannous test on Eco-Goldex
I've add about 125ml of hydro chloric acid(31%), to dissolve out the Zinc
Fine Filter again, keep solid, and paper filter
If your liquid has silver in it , HCL will cause an insoluble Silver Salt, that will filter out solid, and is fine for me.
Sulfuric acid at this step will not cause this , I've never tried, I don't plan to catch silver
For AquaRegia
I've add about 200ml of hydro chloric acid (31%) ,
and 10ml off DIY Nitric acid (must been about 20% conc. , not Shure)
~60oC and Stir , for 3 h
Everything was dissolved , in a clear yellows liquid, and very low solid content
When processing PCB , ram and other item , I get a brown or green liquid at this step , probably coming from cooper, tin, lead, ext.
And it is way more cloudy
Filter AGAIN , keep liquid
Let cool down ,
Add SMB to drop the gold (Sodium metha Bisulfite) , Got very low fizzing ,
so i was probably in very low excess of Nitric acid
Melting in small crucible , and map gaz , I got 1.75g of gold !
Most of my info came from these 3 videos from omegageek64,
LONG video, but very informative
And The guides provided by EcoGoldex
500ml of distilled water, (I now use tap water for this step)
25g of EcoGoldex
Heat and stir at 80oC >30min
Eco goldex never completely dissolve, and Magnetic stirrer couth a lot of Magnetic material. "Iron Dust?"
These 2 seems to be expected , even if ecoGoldex do not really addresses these.
I've filter the solution , This doesn't seem absolutely necessary.
Filter with coffee filter still give cloudy solution
Filter with lab filter still give Cristal clear orange solution
Ive process about 1800g of gold plated pins.
This toke about 2min on the first pins , and about 20-30 min for the last ones.
My pins finished with a nickel color After gold is removed , So there must be another metal before the cooper.
All my pin were cleans , and nothing else was process on this 1st batch
From my personal experience , this was incommoding ,
I got some of the Cyanide poisonings symptoms, even if working outside , with gloves. Mild headache, and mild dizziness. Gold bearing material manipulation force you to be close to the solution
Once liquid is saturated , and items out of it
I've adjust the PH off the solution Sulfuric acid (new battery acid (~30%)) ,
it took 38g to bring ph to about 2, Instruction calls for 1 to 4
Old EcoGoldex call for different PH
This may bubble-out , use big container !
This May cause toxic fume, do in fume hood
I've Ad 2.5g of fine zinc Powder, and mix, to precipitate gold
I've let sit the solution for about 4 days, Stirring from time to time
Fine Filter, keep solid
I've tested the liquid with Stannous Chloride , Test was negative , But I now think it was false Negative
See this tread Stannous test on Eco-Goldex
I've add about 125ml of hydro chloric acid(31%), to dissolve out the Zinc
Fine Filter again, keep solid, and paper filter
If your liquid has silver in it , HCL will cause an insoluble Silver Salt, that will filter out solid, and is fine for me.
Sulfuric acid at this step will not cause this , I've never tried, I don't plan to catch silver
For AquaRegia
I've add about 200ml of hydro chloric acid (31%) ,
and 10ml off DIY Nitric acid (must been about 20% conc. , not Shure)
~60oC and Stir , for 3 h
Everything was dissolved , in a clear yellows liquid, and very low solid content
When processing PCB , ram and other item , I get a brown or green liquid at this step , probably coming from cooper, tin, lead, ext.
And it is way more cloudy
Filter AGAIN , keep liquid
Let cool down ,
Add SMB to drop the gold (Sodium metha Bisulfite) , Got very low fizzing ,
so i was probably in very low excess of Nitric acid
Melting in small crucible , and map gaz , I got 1.75g of gold !
Most of my info came from these 3 videos from omegageek64,
LONG video, but very informative
And The guides provided by EcoGoldex
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