Dear All,
Just to share something what i have done recently , After dissolving scrap jewelry plating wire in diluted nitric acid washed and was left with some mixed gold and white foils.
1)I heated those foils in a steel frying pan until hot red.
2)wash the foils in HCl
3)put those foils in AR and heated to about 120C for about 5 hour with a watch glass covered.(After 5 Hr, Only the gold dissolved but not the white foils)
4)filter out the let over foils and precipitate the gold as usual.
On the second day i decided to melt the new batch of mixed gold and white foils into a button, Those foils are very difficult to melt and only melt at very high temperature. After melting for a long time i got a shiny silver grey button weight 1.2g.
1)I try to dissolve the button in hot AR again but there is no reaction at all even with hot AR the button react only a few tiny bubble at a time.
2)I dissolved the button with 10grams of silver metal to make it an alloys.(Even with the 10g of the silver melted together i still can't get the melting point that i am able to pour shot.)
3)I dissolved the alloy button in 50/50 nitric with no excess just enough, After everything dissolved it left with some gold powder, tiny bits of fine black powder and full of grey powder.(Picture attached)
4) I let it some time to cool down intend to siphon off the silver nitrate but when the solution cool down, The silver has comes down as nice crystal, I added in some water and all the crystal dissolved.
5)I siphon the silver nitrate solution to another beaker and give the residue a nice wash with lot of hot water and combine the wash water to the silver nitrate solution.
6)I added in HCl to remove the silver and filter off the silver chloride and was left with a yellow solution.
7)Tested the solution with stannous Cl and it shows a yellow stain.
8)I slowly add zinc dust to the solution until the solution turns white clear in color, I was left with some finely black powder. I then let the powder settle well(about 10min) then siphon off the solution and washed then dry it in the same beaker with a hot plate. Then finally a nitric acid wash to the powder and again wash and dry.
9)I combine the finely black powder with the previous left over mix powder from the alloy button from nitric wash together in the same beaker.
10)Add in 4HCl to 1 Nitric and heated to 120C with watch glass covered for 2hours with slow increase of Nitric. After the Ar bath all color of the powder dissolved except the grey powder(Suspect Rhodium).
11) Evaporate it, then add some water, precipitate the gold out and test it with stannous Cl and it shows a result that i never seen before. I suspect the solution now contain platinum but i did not precipitated it as i think there should be very little so i save the solution in a bottle.(Stannous Test picture attached).
12)No water to do any refining :lol: :lol: :lol: Tap water here can't be use, Got to wait for rain.
So far i am happy of the result that i have done and Special thanks to Mr Butcher and Mr Harold the man that i respect :lol: :lol: :lol: They has nothing to earn and they has no secret and help me throughout the process. In this forums there are more of this kind of person i did not mention here and i believe this is the type of members that keep the forum going :lol: Of course i did not take advantage by only asking how to do it, I have read and done some research and when really i had bump into a wall then i asked in a polite manner.
I have re-read Hoke's and realise that on
Pg. 119 second Paragraph, It says a maximum temp of 140C-150C to evaporate is adviced?
Pg. 141 If i don't understand wrongly we can do quartation for platinum by using sulfuric?
Also if anyone here care to share how to put rhodium into solution and re-precipitate it?
Regs.......
Franciz
Just to share something what i have done recently , After dissolving scrap jewelry plating wire in diluted nitric acid washed and was left with some mixed gold and white foils.
1)I heated those foils in a steel frying pan until hot red.
2)wash the foils in HCl
3)put those foils in AR and heated to about 120C for about 5 hour with a watch glass covered.(After 5 Hr, Only the gold dissolved but not the white foils)
4)filter out the let over foils and precipitate the gold as usual.
On the second day i decided to melt the new batch of mixed gold and white foils into a button, Those foils are very difficult to melt and only melt at very high temperature. After melting for a long time i got a shiny silver grey button weight 1.2g.
1)I try to dissolve the button in hot AR again but there is no reaction at all even with hot AR the button react only a few tiny bubble at a time.
2)I dissolved the button with 10grams of silver metal to make it an alloys.(Even with the 10g of the silver melted together i still can't get the melting point that i am able to pour shot.)
3)I dissolved the alloy button in 50/50 nitric with no excess just enough, After everything dissolved it left with some gold powder, tiny bits of fine black powder and full of grey powder.(Picture attached)
4) I let it some time to cool down intend to siphon off the silver nitrate but when the solution cool down, The silver has comes down as nice crystal, I added in some water and all the crystal dissolved.
5)I siphon the silver nitrate solution to another beaker and give the residue a nice wash with lot of hot water and combine the wash water to the silver nitrate solution.
6)I added in HCl to remove the silver and filter off the silver chloride and was left with a yellow solution.
7)Tested the solution with stannous Cl and it shows a yellow stain.
8)I slowly add zinc dust to the solution until the solution turns white clear in color, I was left with some finely black powder. I then let the powder settle well(about 10min) then siphon off the solution and washed then dry it in the same beaker with a hot plate. Then finally a nitric acid wash to the powder and again wash and dry.
9)I combine the finely black powder with the previous left over mix powder from the alloy button from nitric wash together in the same beaker.
10)Add in 4HCl to 1 Nitric and heated to 120C with watch glass covered for 2hours with slow increase of Nitric. After the Ar bath all color of the powder dissolved except the grey powder(Suspect Rhodium).
11) Evaporate it, then add some water, precipitate the gold out and test it with stannous Cl and it shows a result that i never seen before. I suspect the solution now contain platinum but i did not precipitated it as i think there should be very little so i save the solution in a bottle.(Stannous Test picture attached).
12)No water to do any refining :lol: :lol: :lol: Tap water here can't be use, Got to wait for rain.
So far i am happy of the result that i have done and Special thanks to Mr Butcher and Mr Harold the man that i respect :lol: :lol: :lol: They has nothing to earn and they has no secret and help me throughout the process. In this forums there are more of this kind of person i did not mention here and i believe this is the type of members that keep the forum going :lol: Of course i did not take advantage by only asking how to do it, I have read and done some research and when really i had bump into a wall then i asked in a polite manner.
I have re-read Hoke's and realise that on
Pg. 119 second Paragraph, It says a maximum temp of 140C-150C to evaporate is adviced?
Pg. 141 If i don't understand wrongly we can do quartation for platinum by using sulfuric?
Also if anyone here care to share how to put rhodium into solution and re-precipitate it?
Regs.......
Franciz