Hi everyone i need some advice to improve this work for large-scale and speed up the process
Here is my work
1. Someone asked me to recover gold from slag sample .
2. The slag came from gold-laden carbon that was smelted with copper and charcoal.
3. I used aqua regia to dissolve the sample after I crushed it.
4. The result was a gelatinous liquid with floating tiny white particles.
5. It was very hard to filter it, but I did it patiently.
6. I used sodium metabisulfite to precipitate gold from the resulting liquid.
7. The gold was suspended in the solution like nanoparticles.
8. I let it settle, but some gold was still present in the solution.
9. I tried a pretreatment with nitric acid, and again the gelatinous precipitate appeared.
10. This time, I saw little shiny gold at the bottom of the beaker.
11. I discarded the gelatinous solution by decantation and dissolved the gold in aqua regia.
The total sample was 600g.
The first run was 400g and yielded 1g of gold.
The second run was a 200g sample, yielding 0.5g of gold.
My problem was the gelatinous solution, which may have trapped some gold inside it. How can I get rid of it?
And how can I make the small gold particles coagulate together?
When I started to read CM Hoke, she mentioned that this book does not cover this issue.
Sorry for my English and for being overly verbose.
Here is my work
1. Someone asked me to recover gold from slag sample .
2. The slag came from gold-laden carbon that was smelted with copper and charcoal.
3. I used aqua regia to dissolve the sample after I crushed it.
4. The result was a gelatinous liquid with floating tiny white particles.
5. It was very hard to filter it, but I did it patiently.
6. I used sodium metabisulfite to precipitate gold from the resulting liquid.
7. The gold was suspended in the solution like nanoparticles.
8. I let it settle, but some gold was still present in the solution.
9. I tried a pretreatment with nitric acid, and again the gelatinous precipitate appeared.
10. This time, I saw little shiny gold at the bottom of the beaker.
11. I discarded the gelatinous solution by decantation and dissolved the gold in aqua regia.
The total sample was 600g.
The first run was 400g and yielded 1g of gold.
The second run was a 200g sample, yielding 0.5g of gold.
My problem was the gelatinous solution, which may have trapped some gold inside it. How can I get rid of it?
And how can I make the small gold particles coagulate together?
When I started to read CM Hoke, she mentioned that this book does not cover this issue.
Sorry for my English and for being overly verbose.