Acid Bleach method problem , help!

[Hamdi]

Hello everyone this is my first thread ever I hope that aim following the rules here .
first I would like to thank you all for the amount of the unmatched great info here on this forums

and I would like mention that after so many mistakes i have made it finally and made my first drop of gold with
nitric + HCL for AR and iron sulfate for precipitation of gold and i have made it 3 times successfully !!

but the thing is that I am starting a small business here in Palestine we have like unlimited amount of e waste that needs people to extract and refine gold from it
but those materials are very hard to get and they are so expensive out here
so i have been trying to do the acid bleach method
i have tried all sodium hypochlorite from 5% to 15% with the 33% hcl
it never fails in dissolving the foils
but i have never recovered the dissolved gold with this method yet
problem is :
* SnCl2 test is always colorless how ever that i have tried changing test material and re tested with another sample in nitric and HCL and it shows positive result.
*while dissolving the foils i noticed that crystals are forming and the bottom of the Beeker so i countered that with more HCL and they have dissloved.
*i have tried 3 times already with 3 grams of foils and and i still have them on split beakers and i failed every time to recover gold from the solution .

so i have read a lot about it here and there and tried to get the ph around 3-5 to keep some hcl for the precipitation and the color of the solution turned exactly as the AR method after dissolving the foils
and i have tried once to neutralize the solution with sodium bicarbonate and after the neutralizing the color were like light blue and crystals were floating in the solution all around lol
what could be doing wrong if any one have experienced the same problem please !!
my method was :
*5 grams foils
*100 ml HCL over them
* added 3ml NaClO every 10 mins with a good stirring until al the foils have dissolved
* after the dissolving i used to heat at low heat for 20 mins to neutralization of any chlorine left
filter & test with Sncl2

i tried to mention everything if there is any question I am up here
thanks a lot already

 

[Yggdrasil]

Hello everyone this is my first thread ever I hope that aim following the rules here .
first I would like to thank you all for the amount of the unmatched great info here on this forums

and I would like mention that after so many mistakes i have made it finally and made my first drop of gold with
nitric + HCL for AR and iron sulfate for precipitation of gold and i have made it 3 times successfully !!

but the thing is that I am starting a small business here in Palestine we have like unlimited amount of e waste that needs people to extract and refine gold from it
but those materials are very hard to get and they are so expensive out here
so i have been trying to do the acid bleach method
i have tried all sodium hypochlorite from 5% to 15% with the 33% hcl
it never fails in dissolving the foils
but i have never recovered the dissolved gold with this method yet
problem is :
* SnCl2 test is always colorless how ever that i have tried changing test material and re tested with another sample in nitric and HCL and it shows positive result.
*while dissolving the foils i noticed that crystals are forming and the bottom of the Beeker so i countered that with more HCL and they have dissloved.
*i have tried 3 times already with 3 grams of foils and and i still have them on split beakers and i failed every time to recover gold from the solution .

so i have read a lot about it here and there and tried to get the ph around 3-5 to keep some hcl for the precipitation and the color of the solution turned exactly as the AR method after dissolving the foils
and i have tried once to neutralize the solution with sodium bicarbonate and after the neutralizing the color were like light blue and crystals were floating in the solution all around lol
what could be doing wrong if any one have experienced the same problem please !!
my method was :
*5 grams foils
*100 ml HCL over them
* added 3ml NaClO every 10 mins with a good stirring until al the foils have dissolved
* after the dissolving i used to heat at low heat for 20 mins to neutralization of any chlorine left
filter & test with Sncl2

i tried to mention everything if there is any question I am up here
thanks a lot already

Welcome.

One thing with HCl/ bleach is that you need to be careful when adding the bleach
as it will neutralize the HCl if you use too much.
SMB like to have an acidic condition so no need to adjust the pH unless it is higher than 3-4.
1-3 is fine.
How do you use the Stannous and how do you make it?
If the Stannous is positive for AR and give no color in HCl/Bleach you either has too high pH or no Gold in solution.

No need to use any hydroxide or Carbonate when refining Gold.
How and in what form can you get chemicals.
HCl in azeotrope 21% is sufficient for Gold refining.
If you can get pool chlorine (tablets) it is better than bleach.
Hydrogen peroxide in 20-30% even better but may be hard to get.

 

[Hamdi]

Welcome.

One thing with HCl/ bleach is that you need to be careful when adding the bleach
as it will neutralize the HCl if you use too much.
SMB like to have an acidic condition so no need to adjust the pH unless it is higher than 3-4.
1-3 is fine.
How do you use the Stannous and how do you make it?
If the Stannous is positive for AR and give no color in HCl/Bleach you either has too high pH or no Gold in solution.

No need to use any hydroxide or Carbonate when refining Gold.
How and in what form can you get chemicals.
HCl in azeotrope 21% is sufficient for Gold refining.
If you can get pool chlorine (tablets) it is better than bleach.
Hydrogen peroxide in 20-30% even better but may be hard to get.

thank you so much firstly
* for the stannous i make it at home with tin metal from board welding wires i add 10 grams after flating it to a beeker with 150ml hcl and heat (medium heat ) them to start the reaction then remove from heating
when the reaction stop & the metal did not dissolve keep adding hcl to the solution and reheat until I get rich Yellowish stannous chloride and then filter from PbCl₂ and store in dark bottle inside of a carton box inside the place of working and it didn't even pass 2 weeks since making it.
* about no gold in the solution I am pretty sure that there is coz my mixed foils jar I used a lot of them with nitric + hcl and dropped gold from them
*chemicals:
for chlorine i can get as tablets or liquid at any concentration and for hcl iam using 33% liquid hcl and i think i can dillute it with c1v1 = c1v2 to get 21%
* for Hydrogen peroxide i did not mention or use it at all at this experiment and i can get it in concentration of 3% - 35%
the bleach i m using it from legit source its 10-15 only NaOCL and water and i have tried the house hold bleach of 5.5% with unfamiliar texture but with the familiar smell and it ended the same colorless stannous test .

 

[Yggdrasil]

thank you so much firstly
* for the stannous i make it at home with tin metal from board welding wires i add 10 grams after flating it to a beeker with 150ml hcl and heat (medium heat ) them to start the reaction then remove from heating
when the reaction stop & the metal did not dissolve keep adding hcl to the solution and reheat until I get rich Yellowish stannous chloride and then filter from PbCl₂ and store in dark bottle inside of a carton box inside the place of working and it didn't even pass 2 weeks since making it.
* about no gold in the solution I am pretty sure that there is coz my mixed foils jar I used a lot of them with nitric + hcl and dropped gold from them
*chemicals:
for chlorine i can get as tablets or liquid at any concentration and for hcl iam using 33% liquid hcl and i think i can dillute it with c1v1 = c1v2 to get 21%
* for Hydrogen peroxide i did not mention or use it at all at this experiment and i can get it in concentration of 3% - 35%
the bleach i m using it from legit source its 10-15 only NaOCL and water and i have tried the house hold bleach of 5.5% with unfamiliar texture but with the familiar smell and it ended the same colorless stannous test .

It is beneficial to have some Tin metals in the bottle.
It will last longer before going bad.
Stannous Chloride is colorless.
Do you use paper, cotton swabs or spot plate for the test?
Peroxide in 20-30% can be used to dissolve foils with HCl.
No danger of getting to high pH.
Same with pool Chlorine as it is an acid stabilized Chlorine source.
What was the pH when the Stannous was clear?