Cementing with Zinc didn't go as planned.

[Yggdrasil]

Yes, if you have any questions, please let me know. I don't hide any answers. I do the work outdoors. Hydrogen sulfide gas, which is created from the combination of sodium metabisulfite and zinc powder, does not harm me.

You really need to study.
Hydrogen Sulfide is one of the deadliest gases out there.
But I don't think it is formed by Zinc and SMB.
But Pyrite and HCl on the other side can be used to generate it.

And you have not answered these questions:
Do you have an assay?
What do you do with your waste?

 

[jakson]

You really need to study.
Hydrogen Sulfide is one of the deadliest gases out there.
But I don't think it is formed by Zinc and SMB.
But Pyrite and HCl on the other side can be used to generate it.

And you have not answered these questions:
Do you have an assay?
What do you do with your waste?

I don't have a lab analysis of the rock, but the metallization in the rock is well done.We throw our garbage in the plain and the uninhabited area

 

[Yggdrasil]

I don't have a lab analysis of the rock, but the metallization in the rock is well done.We throw our garbage in the plain and the uninhabited area

And polluting the water for the future generations, right.

I have said this many times you need to study how to treat ores, and that is not done with acids.

Go get an assay or do one yourself.
At least cupel some concentrate to get a bead to test.
Where in the world are you working?
Generally speaking?
Siberia, South America , Asia or other?

 

[jakson]

و آلودگی آب برای نسل های آینده، درست است.

من این را بارها گفته ام که شما باید نحوه تصفیه سنگ معدن را مطالعه کنید و این کار با اسیدها انجام نمی شود.

برو آزمایش بده یا خودت انجام بده
حداقل مقداری کنسانتره بریزید تا یک مهره برای آزمایش بگیرید.
کجای دنیا کار می کنی؟
به طور کلی؟
سیبری، آمریک

I am from asia(middle east)The heavy metals that are naturally present in the soil have always polluted the water. I don't think that Aqua Regia's waste has more pollution. Anyway, thank you for your attention.There is no reliable laboratory in my country. The operators of the laboratories in my country are liars and frauds who deliberately declare the gold and platinum group test results to be much lower than the truth.

 

[FrugalRefiner]

I am from asia(middle east)The heavy metals that are naturally present in the soil have always polluted the water. I don't think that Aqua Regia's waste has more pollution.

Unfortunately, that's not true. The heavy metals that are naturally present in your soils are generally locked up as metallics, or bound with other elements and/or compounds, like sulfides, etc. Once you dissolve them in AR, you free them from those bonds, and they do, in fact, become more pollution.

Consider copper. You can put a piece of copper metal in your mouth and you won't have any reaction because the copper is in its metallic state. But if you dissolve that copper in AR, the copper ions become highly toxic to virtually every plant and animal on the planet.

Dave

 

[Aidin61]

We have noticed when we have very fine precipitate that do not settle well, boiling in dilute Sulfuric will let it agglomerate better.

The theory is that it aquire a coating that hinders it to agglomerate.
By using weak hot Sulfuric this coating is removed and the particles get cleaner and settles well.

hey there!
I have a pregnant AR solution and I use Copperas to precipitate gold from the solution. As I add the precipitant, the gold particles start to form but they are very fine (like dust) and most of them are suspended in the solution (which make the solution cloudy) and it takes long time to settle down and I have to wait over night to collect all gold particles.

The question is: which chemicals, as coagulant, fit to my solution (solution pH=2 and temp=23 celsius degree) that makes the particles to stick together and settle down faster?
you suggest "weak hot Sulfuric acid solution" to my case as well?
Thanks.

 

[Yggdrasil]

hey there!
I have a pregnant AR solution and I use Copperas to precipitate gold from the solution. As I add the precipitant, the gold particles start to form but they are very fine (like dust) and most of them are suspended in the solution (which make the solution cloudy) and it takes long time to settle down and I have to wait over night to collect all gold particles.

The question is: which chemicals, as coagulant, fit to my solution (solution pH=2 and temp=23 celsius degree) that makes the particles to stick together and settle down faster?
you suggest "weak hot Sulfuric acid solution" to my case as well?
Thanks.

Welcome.
We need much more information.
What was dissolved, how was the AR made, how was it deNOxed and so on.
How was it tested?

Here are something for your studies:

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/


Edit to add information

 

[nickvc]

hey there!
I have a pregnant AR solution and I use Copperas to precipitate gold from the solution. As I add the precipitant, the gold particles start to form but they are very fine (like dust) and most of them are suspended in the solution (which make the solution cloudy) and it takes long time to settle down and I have to wait over night to collect all gold particles.

The question is: which chemicals, as coagulant, fit to my solution (solution pH=2 and temp=23 celsius degree) that makes the particles to stick together and settle down faster?
you suggest "weak hot Sulfuric acid solution" to my case as well?
Thanks.

If you bring your solution to a low boil it should help to settle the gold faster but be sure you have no free oxidizer or your gold will redissolve..