platinum01786
Member
- Joined
- Apr 7, 2018
- Messages
- 10
Hi,
i have been refining gold using an aqua regia refining plant but for some reason i am unable to get the shiny mirror finish on the gold. instead i get rough edges and a frosty surface only ( see pic) a fraction of it will be shiny so heres what i have done to try and fix the problem
- percipitate using metabisulphate and stop at 500 minivolts to ensure no percipitation of platinum group metals
- Ensure input material has no lead and silver content is below 5%
- refined material twice
- used 32% HCL and 60% nitric 3:1 ratio
- used 36% hcl and 6% nitric 3:1 ratio ( this made things worse)
- wash percipitated gold powder with HOT HCL
- Wash powder with Boiling water
- wash with distilled water
-melting the powder into distilled water for granulation
- granulating in distilled water and denatured alcohol
- melting powder using vacuum casting
-using electrolysis machine to achieve .99999
unfortunately none of these worked
can anyone suggests how i can achieve mirror finish surface. the issue is not with the melting part or purity (as i have seen 99.5% bullion look shinier) but somewhere in the refining process. see attached image has some craking in it also
i have been refining gold using an aqua regia refining plant but for some reason i am unable to get the shiny mirror finish on the gold. instead i get rough edges and a frosty surface only ( see pic) a fraction of it will be shiny so heres what i have done to try and fix the problem
- percipitate using metabisulphate and stop at 500 minivolts to ensure no percipitation of platinum group metals
- Ensure input material has no lead and silver content is below 5%
- refined material twice
- used 32% HCL and 60% nitric 3:1 ratio
- used 36% hcl and 6% nitric 3:1 ratio ( this made things worse)
- wash percipitated gold powder with HOT HCL
- Wash powder with Boiling water
- wash with distilled water
-melting the powder into distilled water for granulation
- granulating in distilled water and denatured alcohol
- melting powder using vacuum casting
-using electrolysis machine to achieve .99999
unfortunately none of these worked
can anyone suggests how i can achieve mirror finish surface. the issue is not with the melting part or purity (as i have seen 99.5% bullion look shinier) but somewhere in the refining process. see attached image has some craking in it also