ahmadbayoumi
Well-known member
Hell ALL,
Last week I was processing about 675g of IC chips from RAM sticks.
I followed Pat's guide exactly as mentioned in his PDF.
The yield was 0.4g of gold powder and I believe that this is a very low yield.
I'm not sure where is the gold gone?
I used more than 2.5 ml of HNO3 to dissolve all gold wires but only managed to get 0.4g.
I used small increments of HNO3 to be sure that there's no excess nitric.
And after every small addition of HNO3 (0.5+0.5+0.3+0.3+0.3+0.2+0.2+0.2+0.2 ml) I heated the solution for about 30 mins. for each HNO3 addition to speed up the reaction using a glass watch to avoid losing values and then check for remaining gold so that I can see if more HNO3 is needed to avoid excess nitric.
I don't know where's the gold as I was expecting at least 2g however I got only 0.4g
Steps:
1 - Incinerated
2 - Crashed (didn't use ball mill)
3 - Removed metallic parts/pins and removed Si wafers
4 - Washed/Panned
5 - Diluted HNO3 (30%) warm bath
6 - Washed 5 times with distilled water to remove any HNO3 traces
7 - Washed 5 times with tap water to remove any remaining HNO3 traces
8 - Warm HCL bath
9 - AR (Small increments of HNO3 55%) with heat (20-30 mins.) after each addition with total 2.7 ml of HNO3 55% and used a glass watch to avoid losses
10- Diluted with tap water and left the solution to cool
11- Filtered
12- Used SMB to precipitate gold
13- Left the solution over night
14- Got 0.4g of gold powder
Need you help PLS
Last week I was processing about 675g of IC chips from RAM sticks.
I followed Pat's guide exactly as mentioned in his PDF.
The yield was 0.4g of gold powder and I believe that this is a very low yield.
I'm not sure where is the gold gone?
I used more than 2.5 ml of HNO3 to dissolve all gold wires but only managed to get 0.4g.
I used small increments of HNO3 to be sure that there's no excess nitric.
And after every small addition of HNO3 (0.5+0.5+0.3+0.3+0.3+0.2+0.2+0.2+0.2 ml) I heated the solution for about 30 mins. for each HNO3 addition to speed up the reaction using a glass watch to avoid losing values and then check for remaining gold so that I can see if more HNO3 is needed to avoid excess nitric.
I don't know where's the gold as I was expecting at least 2g however I got only 0.4g
Steps:
1 - Incinerated
2 - Crashed (didn't use ball mill)
3 - Removed metallic parts/pins and removed Si wafers
4 - Washed/Panned
5 - Diluted HNO3 (30%) warm bath
6 - Washed 5 times with distilled water to remove any HNO3 traces
7 - Washed 5 times with tap water to remove any remaining HNO3 traces
8 - Warm HCL bath
9 - AR (Small increments of HNO3 55%) with heat (20-30 mins.) after each addition with total 2.7 ml of HNO3 55% and used a glass watch to avoid losses
10- Diluted with tap water and left the solution to cool
11- Filtered
12- Used SMB to precipitate gold
13- Left the solution over night
14- Got 0.4g of gold powder
Need you help PLS