All about sulfides rocksmashmouth

[Yggdrasil]

Hello to the professors and hardworking people of this website. Please can anyone help me. I dissolved gold sulphide soil in aqua regia and precipitated gold with zinc powder along with some impurities.I roasted the sediment at 600 degrees, then I put it in nitric acid. The brown sediment remained at the bottom, and I melted it with air gas.I only used borax, when it was semi-solid, it formed a piece of yellow metal at a temperature of approximately 600-700 degrees, but when the temperature reached 1000 degrees, the moment it became liquid, its volume became smaller and smaller and the yellow glow disappeared, brown slag was formed and melted failed.Now, where was my mistake that I could not succeed? Was there an impurity deposit, or did I not use a good melting fluxes, or was it not gold?Sorry it took so long

First and foremost, you DO NOT put soil/rocks in Acids if you do not have an assay.
Next, roasting is the first you do with Sulfides, this drives off the Sulfur.
Did you test your AR for Gold?

No point in roasting after dropping with Zinc, why did you not use Copper?
Zinc drops all metals, but Copper drops only precious metals and Mercury.

Pleas describe in more detail what you have done.
Step by step please.

 

[jakson]

First and foremost, you DO NOT put soil/rocks in Acids if you do not have an assay.
Next, roasting is the first you do with Sulfides, this drives off the Sulfur.
Did you test your AR for Gold?

No point in roasting after dropping with Zinc, why did you not use Copper?
Zinc drops all metals, but Copper drops only precious metals and Mercury.

Pleas describe in more detail what you have done.
Step by step please.

Hello, sir, roasting the stone at 600 degrees doesn't remove the sulfur, I have to raise the temperature to 900 degrees, but this is difficult, I am sure about the gold in the stone, because other people take stones from the same mine and extract gold,But they don't teach me how to recover it .The precipitation of metals with zinc powder is the electronegative function of the elements, and the first metal that precipitates will be gold. Gold has an electronegativity of 2.5. In the discussion of mineral soil, we are not dealing with a few elements to say that zinc powder will precipitate all of them, but we have dozens of different elements and Copper does not work in such contaminated solutions.I have explained everything I did, if you don't understand a step, please ask me and I will give you a more detailed answer.

 

[Yggdrasil]

Hello, sir, roasting the stone at 600 degrees doesn't remove the sulfur, I have to raise the temperature to 900 degrees, but this is difficult, I am sure about the gold in the stone, because other people take stones from the same mine and extract gold, but the extraction method is I do not teach.The precipitation of metals with zinc powder is the electronegative function of the elements, and the first metal that precipitates will be gold. Gold has an electronegativity of 2.5. In the discussion of mineral soil, we are not dealing with a few elements to say that zinc powder will precipitate all of them, but we have dozens of different elements and Copper does not work in such contaminated solutions

Copper works very well in dirty solutions and are the recommended method as it will leave all other than precious elements in solution.
Zinc will drop all even Copper, and there are no specific order on how and when things cement out in a mix like this.
You do need to test your solution with at least stannous, if there are no Gold in solution, there will be no Gold coming out either.
Roasting should be done at between 600 and 850C, not higher.

So please tell us what you do and in which order, if not it will be hard to help you.

I see you somehow did not get the links I usually post, so here they are:
Study these links well.

We ask our new members to do 3 things.
1. Read C.M. Hokes book on refining jewelers scrap, it gives an easy introduction to the most important chemistry regarding refining.
It is free here on the forum: https://goldrefiningforum.com/phpBB3/viewtopic.php?f=54&t=19798
2. Then read the safety section of the forum: https://goldrefiningforum.com/forums/safety.47/
3. And then read about "Dealing with waste" in the forum: https://goldrefiningforum.com/threads/dealing-with-waste.10539/

Suggested reading:
https://goldrefiningforum.com/forums/the-library.101/
https://goldrefiningforum.com/threads/when-in-doubt-cement-it-out.30236/
https://goldrefiningforum.com/threa...le-read-this-before-you-post-about-ore.33333/


Forum rules is here.
https://goldrefiningforum.com/threads/gold-refining-forum-rules.31182/

 

[jakson]

Copper works very well in dirty solutions and are the recommended method as it will leave all other than precious elements in solution.
Zinc will drop all even Copper, and there are no specific order on how and when things cement out in a mix like this.
You do need to test your solution with at least stannous, if there are no Gold in solution, there will be no Gold coming out either.
Roasting should be done at between 600 and 850C, not higher.

So please tell us what you do and in which order, if not it will be hard to help you.

I see you somehow did not get the links I usually post, so here they are:
Study these links well.

We ask our new members to do 3 things.
1. Read C.M. Hokes book on refining jewelers scrap, it gives an easy introduction to the most important chemistry regarding refining.
It is free here on the forum: https://goldrefiningforum.com/phpBB3/viewtopic.php?f=54&t=19798
2. Then read the safety section of the forum: https://goldrefiningforum.com/forums/safety.47/
3. And then read about "Dealing with waste" in the forum: https://goldrefiningforum.com/threads/dealing-with-waste.10539/

Suggested reading:
https://goldrefiningforum.com/forums/the-library.101/
https://goldrefiningforum.com/threads/when-in-doubt-cement-it-out.30236/
https://goldrefiningforum.com/threa...le-read-this-before-you-post-about-ore.33333/


Forum rules is here.
https://goldrefiningforum.com/threads/gold-refining-forum-rules.31182/

I have read these links but copper does not work in aqua regia complex minerals

 

[Yggdrasil]

I have read these links but copper does not work in aqua regia complex minerals

Copper do work well in all acidic solutions.

Read this link:
https://goldrefiningforum.com/threads/when-in-doubt-cement-it-out-_cementation_.30236/post-316726

 

[Martijn]

I dissolved gold sulphide soil in aqua regia and precipitated gold with zinc powder along with some impurities.

Let's verify these statements before we proceed.
How do you know it is gold sulfide soil?
How do you know it dissolved? And how do you know what you have precipitated?
Previpitated gold does not need smelting, you can simply melt it after you got rid of said impurities.

Smelting would be done on the roasted sulfides with a mix of fluxes.

Treating ores with acids usually equals a limited lifespan.

 

[jakson]

Let's verify these statements before we proceed.
How do you know it is gold sulfide soil?
How do you know it dissolved? And how do you know what you have precipitated?
Previpitated gold does not need smelting, you can simply melt it after you got rid of said impurities.

Smelting would be done on the roasted sulfides with a mix of fluxes.

Treating ores with acids usually equals a limited lifespan.

Hello sir, the answer to your first question: the test of stannous chloride aqua regia turns purple. The answer to your second question: I don't know whether the gold is completely dissolved or not. The answer to your third question, I washed the black sediment from zinc cement with hydrochloric acid and nitric acid, but it did not dissolve.Along with the gold deposit, there are impurities that are insoluble in acids. I want to melt gold with these impurities, which fluxes are suitable?

 

[Martijn]

Precipitated metals need no flux. Just melt and let them cool.
But if they disappear while melting, it might not be gold.
Strange that you still get a positive for gold. It should melt and not evaporate.

 

[jakson]

Precipitated metals need no flux. Just melt and let them cool.
But if they disappear while melting, it might not be gold.
Strange that you still get a positive for gold. It should melt and not evaporate.

Does that mean I should not use borax or copper or silver when melting?

 

[Yggdrasil]

Does that mean I should not use borax or copper or silver when melting?

Since you seem to be unwilling to get an assay (you can make a simple assay yourself you know.) we have to do it different.

First we need to establish what you have and not.
Do you have a clear picture of your stannous test?
Do you have a picture of your precipitate?

Please answer step by step what you do.
All the steps please.
Crush/mix ore/rocks/sand add this for so and so long then ......

 

[Yggdrasil]

Does that mean I should not use borax or copper or silver when melting?

Pure Gold do not need Flux nor Borax, just a glaced melting dish.

 

[jakson]

Since you seem to be unwilling to get an assay (you can make a simple assay yourself you know.) we have to do it different.

First we need to establish what you have and not.
Do you have a clear picture of your stannous test?
Do you have a picture of your precipitate?

Please answer step by step what you do.
All the steps please.
Crush/mix ore/rocks/sand add this for so and so long then ......

Unfortunately, I don't have photos of the precipitation and stanos test, but this time I will melt without flux to see what happens

 

[Martijn]

Does that mean I should not use borax or copper or silver when melting?

Borax is needed to glaze a white alumina crucible, copper and silver only have use if you want to make an alloy.

 

[Martijn]

Unfortunately, I don't have photos of the precipitation and stanos test, but this time I will melt without flux to see what happens

to add: a purple stannous test is a weak gold solution. A good pregnant solution something worth chasing will give a dark black stannous stain which you will have to dilute to see if it's brown or purple.
So your purple stain indicates there is some, but not much gold in solution.

 

[jakson]

to add: a purple stannous test is a weak gold solution. A good pregnant solution something worth chasing will give a dark black stannous stain which you will have to dilute to see if it's brown or purple.
So your purple stain indicates there is some, but not much gold in solution.

Thank you, I will try to find better soil

 

[Barstool miner]

Hello, Jacksonwill try to find better soil

Hello, Jackson. I am interested in the strength of Aqua regia that you are using. Excess Nitric in your leach changes the dianamics of the Leach. Lastly Are you in Berlin Germany?

 

[jakson]

Hello, Jackson. I am interested in the strength of Aqua regia that you are using. Excess Nitric in your leach changes the dianamics of the Leach. Lastly Are you in Berlin Germany?

Hello, I am not in Berlin

 

[Barstool miner]

Hello, I am not in Berlin

Your location is listed as Berlin??

 

[jakson]

Your location is listed as Berlin??

I am from this city but I am currently traveling

 

[Martijn]

Thank you, I will try to find better soil

Better yet; try to concentrate placer gold from the soil. Then ask how to proceed.
Don't treat soil with acids like AR for health reasons.
But you had a precipitate. That should be gold. And now you go look for more soil?
take a step back and start reading some prospecting and placer concentrating. (not much of that found on this forum btw)

Something that turns yellow and disappears in a melt sounds like sulfur or other possible nasty stuff that goes up in smoke. Don't experiment with that. It's dangerous.