hallo from jivo.j

[jivo.j]

hallo every one ,
i am new in forum .
work like goldsmith in london .
have interesed to hot separating and refining metals .

 

[Yggdrasil]

hallo every one ,
i am new in forum .
work like goldsmith in london .
have interesed to hot separating and refining metals .

Welcome to us.
What do you mean with hot separating?

 

[jivo.j]

example - cupelation .

 

[Yggdrasil]

example - cupelation .

Cupelation are mostly for reclaiming PMs from ore or very mixed dirty unknown mixes.
Not for jewelry scrap.
Then only smelting and hydro metallurgical processes including electrolysis will do.

 

[4metals]

Usually jewelers prefer to work with inquartation and parting to purify their gold. However I do know some smaller jewelers who use cupellation to remove all of the base metals and are left with a smaller quantity of gold alloy to inquart. In almost all of these cases that I know of first hand, they use cupellation because they have the kiln on hand and working in a hood.

Cupellation does volatilize about 10% of the lead used in the process.

 

[jivo.j]

thank you- 4metals - briliant answer .in this case we have aloy between PM and base metal . in the end have pure PM 100%

my big target is to separate dust ag, au,pt . (by special melting proces) 90 -95 % purity os ok for me .

have small target - to clean partly dirty PM. - 9ct. 14ct.18ct.
1.after melting with old glas powder,
2.melting "broken" gold aloy in potato .
3..

 

[4metals]

Cupellation is done using lead to wrap the alloys and they are heated to melting in a furnace while sitting in a cupel. The lead oxidizes and is drawn into the cupel (typically bone ash) leaving the precious metals behind.

Your reference to glass and a potato is lost on me. The art of cupellation is not. Potato's can be used to separate the mercury in amalgam from the metals, and borax (glass) is used to scorify base metals into a slag layer in a melt with granulated lead.

The cupellation will not separate out the Silver Gold and Platinum that you mention from each other, what remains in the cupel will be an alloy of those 3 metals.

I think there is a language issue going on here unfortunately all I can do for you is in English.

 

[jivo.j]

yes , 4 metals you want to bring useful information . if you want to much you can say easy for not english person like me .
have nuance goldsmith work with pm aloys 9 ct ,18ct , 950 , 925 .
pure pm is just in the begining ,every day i work with aloys.
they can be useful with proper fisical parameter - can be bended , soldered , welded and can be recycled.
pb 0.0001 part of aloy make - "broken "metal must be refined to 14 ct, or 18 ct useful aloy .( not 100% pure metal) clear and pure are different for goldsmith and rafiner .
in this case i use oxidasing or neutralising or degasing melting with chemical like borax , or metal like cadmium ,or with soda .

separate case - i have mix with dust pt, ag,au. they wait to find method for separating .this is not casual tusk .

 

[Yggdrasil]

yes , 4 metals you want to bring useful information . if you want to much you can say easy for not english person like me .
have nuance goldsmith work with pm aloys 9 ct ,18ct , 950 , 925 .
pure pm is just in the begining ,every day i work with aloys.
they can be useful with proper fisical parameter - can be bended , soldered , welded and can be recycled.
pb 0.0001 part of aloy make - "broken "metal must be refined to 14 ct, or 18 ct useful aloy .( not 100% pure metal) clear and pure are different for goldsmith and rafiner .
in this case i use oxidasing or neutralising or degasing melting with chemical like borax , or metal like cadmium ,or with soda .

separate case - i have mix with dust pt, ag,au. they wait to find method for separating .this is not casual tusk .

As you say separating the metals can not be done by heat.
If yoi are going to separate them you need to dissolve one or all then drop them out in a proper way.

 

[4metals]

There are methods which a small jeweler / refiner can use but to start off can you tell us do you have the ability to work with chemicals in a fume hood and acquire the necessary acids? If you do, the option of inquartation and parting with nitric acid is the easiest path for you.