Aqua regia a lot of SMB...

[Shark]

If the gold is thick enough it can stop the nitric acid process. Gold filled will do the same thing. It leaves a shell of the outside gold and some of the copper or other base metals inside. This is why a good washing process is needed for the gold powders. Also, it is why we often process the powders a second time.

Often it is suggested to post the complete process one intends to use step by step. This helps us to find the area that may cause problems. I have looked but cannot find the post about “ “getting gold bright and shiny”. Maybe someone can post that here for us.

 

[Biom]

If not much you have to refine .after some nitric .just go to A R desolve every thing .and second time AR with defrent precipitant .that's why need to know what exactly metals you have in alloy .if you dealing with just gold and copper is defrent story if you dealing with gold .tin .silver .you need to know what metals beside gold .you dealing with

 

[Biom]

If the gold is thick enough it can stop the nitric acid process. Gold filled will do the same thing. It leaves a shell of the outside gold and some of the copper or other base metals inside. This is why a good washing process is needed for the gold powders. Also, it is why we often process the powders a second time.

Often it is suggested to post the complete process one intends to use step by step. This helps us to find the area that may cause problems. I have looked but cannot find the post about “ “getting gold bright and shiny”. Maybe someone can post that here for

 

[Biom]

Need to know exactly what metal he's dealing with .in melt need to add sodium bicarbonate if it only the gold in melt if there is other metal can cause tarnsh

 

[Martijn]

I have looked but cannot find the post about “ “getting gold bright and shiny”. Maybe someone can post that here for us.

Sure we can:
https://goldrefiningforum.com/posts/2620/

 

[Biom]

Sodium bicarbonate in melt.

 

[Martijn]

Need to know exactly what metal he's dealing with .in melt need to add sodium bicarbonate if it only the gold in melt if there is other metal can cause tarnsh

Gold. If anything else is in there, he did not refine it good enough and should not be melting yet and refine again.

 

[Alexander_Hun]

Thanks!

Maybe I will refine the gold again, what I usually do is put nitric acid on the reduced gold powder so that if it contains other metals besides the gold, do you think it's a good idea?

 

[Biom]

Ok need to know how much gold you dealing with if you know what other metal .if cant find out what you have .then use nitric 50 water and then AR with what left precipitate .and .AR second time with deferent precipitant . Use shark advice on waching that's one option .but try to find out what you have .if you making this to sale .sale it the way it is don't worry about shiny .an refiner will finish it .need to know what you have how much .

 

[Biom]

Gold. If anything else is in there, he did not refine it good enough and should not be melting yet and refine again.

Yes shiny gold is from the start

 

[Martijn]

Thanks!

Maybe I will refine the gold again, what I usually do is put nitric acid on the reduced gold powder so that if it contains other metals besides the gold, do you think it's a good idea?

If you got rid of all traces of HCl or if you accept a part of the gold redissolving from weak AR, yes.

And you should/could save that spent nitric for a future dirty digestion.

 

[Alexander_Hun]

Sodium bicarbonate in melt.

Sodium bicarbonate, or natrium carbonate?

 

[Biom]

Sodium bicarbonate, or natrium carbonate?

S b

 

[Yggdrasil]

S b

We use correct names for chemicals or formulas.
Using the wrong chemicals can in certain cases lead to serious accidents or at least to unwanted reactions.

 

[Biom]

We use correct names for chemicals or formulas.
Using the wrong chemicals can in certain cases lead to serious accidents or at least to unwanted reactions.

Sorry yes that's true

 

[Alexander_Hun]

I usually take it for heartburn if there is nothing else at home I asked to make sure I understood correctly

 

[Biom]

I usually take it for heartburn if there is nothing else at home I asked to make sure I understood correctly

Yes but if still have same problem .You have to refine again . Sodium bicarbonate can take some tarnish . but if there is more traces of other metal . you have to refine again

 

[Alexander_Hun]

Hi, on the advice of many, I refined the gold again, the result is good! I boiled the gold dust in hydrochloric acid and then in distilled water several times.

 

[Biom]

Hi, on the advice of many, I refined the gold again, the result is good! I boiled the gold dust in hydrochloric acid and then in distilled water several

 

[Biom]

Great happy for you itb looks good . You can do more same steps good luck