pyrite gold extraction

[solarsmith]

I used a shaker table to concentrate the milled ore and sent my #1 cons (best ) to the assayer and got a big surprize. The #1 cons had 0 gold. the one and only place for gold to get out of the system was in the magnetic seperator. so I assayed it and BINGO found all the gold tied to my magnetic ferros iron. iron assay of 98% and no gold in the tails or the slimes....just a mater of seperating iron from gold.

 

[Alondro]

View attachment 66074
Picture of XRF of the melted precipitate Au=98.6%

Is the XRF properly calibrated? Have you tested against NEGATIVE controls to be sure you're not getting false positives?

 

[RevMatt]

Is the XRF properly calibrated? Have you tested against NEGATIVE controls to be sure you're not getting false positives?

the XRF belongs to a friend that uses it to verify metals in a commercial setting so my assumption is he keeps it calibrated

 

[Alondro]

the XRF belongs to a friend that uses it to verify metals in a commercial setting so my assumption is he keeps it calibrated

It's ALWAYS proper protocol to test a positive and negative control sample to ensure the calibration is still correct. When I worked in a biology lab, EVERY experiment had a positive and negative control.

 

[RevMatt]

It's ALWAYS proper protocol to test a positive and negative control sample to ensure the calibration is still correct. When I worked in a biology lab, EVERY experiment had a positive and negative control.

Thankyou for the advice... I will double check the next time I take a sample to him to test...

 

[solarsmith]

Most gold from hard rock mines is in the form of sulfides. I know some try to float it and get good recovery but others just take it straight to the leach pile. If its rich enough part of the gold can be gravity recovered. in my case the gold is attached to the iron and the first step is washing it over a magnetic drum/belt. then a warm acid bath to break down any suphides in the ore folowed by a ph shift to 11,5 and then a bosted eco-goldex leach. Folowed by a zinc cementing

 

[goldshark]

Most gold from hard rock mines is in the form of sulfides. I know some try to float it and get good recovery but others just take it straight to the leach pile. If its rich enough part of the gold can be gravity recovered. in my case the gold is attached to the iron and the first step is washing it over a magnetic drum/belt. then a warm acid bath to break down any suphides in the ore folowed by a ph shift to 11,5 and then a bosted eco-goldex leach. Folowed by a zinc cementing

What does "bosted" mean?

 

[Yggdrasil]

What does "bosted" mean?

I assumed it was boosted.

 

[solarsmith]

I assumed it was boosted.

 

[solarsmith]

oh yes BOOSTED . I like sodium percarbonate. its a great oxidizer. its what oxyclean is made out of. A lot of my videos show it in use.

 

[goldshark]

oh yes BOOSTED . I like sodium percarbonate. its a great oxidizer. its what oxyclean is made out of. A lot of my videos show it in use.

For what size amounts? Which would be better for a 55 gallon drum, percarxonate or bubbled Oxygen.

 

[anachronism]

For what size amounts? Which would be better for a 55 gallon drum, percarxonate or bubbled Oxygen.

Always been a fan of bubbled air over chemical addiction.

 

[RevMatt]

Hmmmm... it would appear, the Pyrite I am trying from Peru has barely trace amounts of Au ... anybody happen to have a small amount of concentrated Pyrite I can test or better yet, is to test against a similar known quantity of Au in it through other means. (like roasting and smelting)

 

[RevMatt]

Most gold from hard rock mines is in the form of sulfides. I know some try to float it and get good recovery but others just take it straight to the leach pile. If its rich enough part of the gold can be gravity recovered. in my case the gold is attached to the iron and the first step is washing it over a magnetic drum/belt. then a warm acid bath to break down any suphides in the ore folowed by a ph shift to 11,5 and then a bosted eco-goldex leach. Folowed by a zinc cementing

Some of the other folks with a more extensive chemistry knowledge may want to weigh in on the following suggestion mostly because I have only done this on a small scale (less than 500g of concentrate) and you appear to be doing this on a larger scale of cons... I sent you a privet message if you have questions

based on your youtube videos and your responses on this thread...

sodium percarbonate is a good choice for an oxidizer... experiment suggestion: once your mixture has been stirring for at least 12hr add So4 (very slowly) as the mixture will heat up very quickly, qty should be in total less then 1/10th to the water volume ... the idea here :

When hydrogen peroxide (H2O2) reacts with sulfate ions (SO4^2-), there is no direct chemical reaction between them; however, in the presence of a suitable catalyst like a metal ion (e.g., Fe^2+), H2O2 can oxidize sulfite ions (SO3^2-) to sulfate ions (SO4^2-), essentially acting as an oxidizing agent to convert lower oxidation state sulfur to a higher oxidation state.

Key points about this reaction:

• No direct reaction:
  H2O2 and SO4^2- do not react directly with each other under normal conditions.
  
  
• Oxidation of sulfite:
  If sulfite ions (SO3^2-) are present, H2O2 can oxidize them to sulfate ions (SO4^2-) in a catalyzed reaction.
  
  
• Catalyst needed:
  A catalyst like a metal ion (often iron) is typically required to facilitate the oxidation reaction.