Dear Friends;
İ prepared Aqua Regia (AR) solution of Pb-Cu rougher concentrates ( 57% Pb and % 19 Cu) to test the gold presence with stannous chloride.
Procedures as follows
- 20 gram concentrates
-250 ml of AR (62.5 ml HCL of 33 percent and 187.5 ml of nitric acid of 67 % percent strength)
- İ contiuned in 30 minutes at simmering hot until red fumes of Nitric Acid is completely driven off and white fumes of HCl appears.
- İ let solution to cool down in room temperature. There was no any fizing in AR solution.
- i did not make denoxing and i did not filter the pregnant solution.
- i picked up 2 ml of pregnant solution in white spot plate.
- when a drop stannous chloride in spot plate İ saw very dark and dense black color like a ink. A few minutes later dark color disapered ( due to excess nitric) Then once more a drop of stannous chloride and i saw again same dark and dense color.
- i diluted 2 ml of pregnant solution with 1 ml tap water..
- when first drop of SnCl2 meet with pregnant solution at first seconds İ saw dense cassius of purple with dark black color.
Can there be palladium in Pb-Cu concentrates..
Any comment would be appreciated....
-
İ prepared Aqua Regia (AR) solution of Pb-Cu rougher concentrates ( 57% Pb and % 19 Cu) to test the gold presence with stannous chloride.
Procedures as follows
- 20 gram concentrates
-250 ml of AR (62.5 ml HCL of 33 percent and 187.5 ml of nitric acid of 67 % percent strength)
- İ contiuned in 30 minutes at simmering hot until red fumes of Nitric Acid is completely driven off and white fumes of HCl appears.
- İ let solution to cool down in room temperature. There was no any fizing in AR solution.
- i did not make denoxing and i did not filter the pregnant solution.
- i picked up 2 ml of pregnant solution in white spot plate.
- when a drop stannous chloride in spot plate İ saw very dark and dense black color like a ink. A few minutes later dark color disapered ( due to excess nitric) Then once more a drop of stannous chloride and i saw again same dark and dense color.
- i diluted 2 ml of pregnant solution with 1 ml tap water..
- when first drop of SnCl2 meet with pregnant solution at first seconds İ saw dense cassius of purple with dark black color.
Can there be palladium in Pb-Cu concentrates..
Any comment would be appreciated....
-