Jwdds
Member
- Joined
- Apr 24, 2022
- Messages
- 18
Hello, Im in the process of research and came across this wonderful forum. I have been reading a lot of posts from this forum as well as general research on the internet youtube etc.
Im trying to recreate a cyanide free electrolyte resulting in a 10 gram Au per 500ml solution which i believe is amonia or ammonium hydroxide with a final pH of 9. So that i can hasten the learning curve I decided to post this algorhythm here in hopes of getting input from you with a experience in refining. Any help would be greatly appreciated. Im not tied to this approach and if anyone can offer something completely different then Im open to that too. I acknowledge that this post is a bit antithical to refining gold since Im asking about deconstructing it instead
I found this patent which appears to be a good start for the formula. I am hoping some of you with more experience can point me down the right path. Here are some general questions I have about the process below?
1) Since Im starting with .9999 gold and I dont mind the extra time vs toxicology of the process I was thinking about using 45ml HCl with 3% peroxide instead of Nitric acid any thoughts on that?
2) After evaporaing in step one it appears they are rehydrating with salt water before adding the barium hydroxide. If im eliminating nitric acid is the NaCl still uselful or just enough distilled water to rehydrate?
3) b-d below; Do you interpret this as adding NaOH till i get the suspension boiling then add additional NaOH till a precipitate forms? is adjusting the pH to raise the pH with NaOH or the pH lowers as the NaOH boils off?
4) I assume I should test my solutions as I go to be sure Im not leaving gold behind in any of the steps, making adjustments as necessary?
After achieving the final solution after Na2S03 I was planning on adding first ammonium hydroxide till i get a pH of 9 then using distilled water to make up the balance of 500ml.
5) does the above alogrythm seem reasonable to you or do you have any suggestions where I can improve this process? I really appreciate your input.
from patent - US6126807A - Process for making sodium gold sulfite solution - Google Patents
1. A process for producing a sodium gold sulfite solution, comprising:
(a) dissolving Ba(OH)2 in an aqueous solution of Na(AuCl4) to produce a mixture;
(b) mixing NaOH with said mixture to produce a suspension;
(c) boiling the resulting suspension;
(d) adjusting the pH of the suspension from step (c) to produce a precipitate and a filtrate;
(e) dissolving Na2 SO3 in a slurry of the precipitate from step (d) to produce a suspension;
(f) heating the suspension from step (e);
(g) filtering the suspension from step (f) to produce a filter cake and a filtrate; and
(h) recovering filtrate as sodium gold sulfite in solution.
Im trying to recreate a cyanide free electrolyte resulting in a 10 gram Au per 500ml solution which i believe is amonia or ammonium hydroxide with a final pH of 9. So that i can hasten the learning curve I decided to post this algorhythm here in hopes of getting input from you with a experience in refining. Any help would be greatly appreciated. Im not tied to this approach and if anyone can offer something completely different then Im open to that too. I acknowledge that this post is a bit antithical to refining gold since Im asking about deconstructing it instead
I found this patent which appears to be a good start for the formula. I am hoping some of you with more experience can point me down the right path. Here are some general questions I have about the process below?
1) Since Im starting with .9999 gold and I dont mind the extra time vs toxicology of the process I was thinking about using 45ml HCl with 3% peroxide instead of Nitric acid any thoughts on that?
2) After evaporaing in step one it appears they are rehydrating with salt water before adding the barium hydroxide. If im eliminating nitric acid is the NaCl still uselful or just enough distilled water to rehydrate?
3) b-d below; Do you interpret this as adding NaOH till i get the suspension boiling then add additional NaOH till a precipitate forms? is adjusting the pH to raise the pH with NaOH or the pH lowers as the NaOH boils off?
4) I assume I should test my solutions as I go to be sure Im not leaving gold behind in any of the steps, making adjustments as necessary?
After achieving the final solution after Na2S03 I was planning on adding first ammonium hydroxide till i get a pH of 9 then using distilled water to make up the balance of 500ml.
5) does the above alogrythm seem reasonable to you or do you have any suggestions where I can improve this process? I really appreciate your input.
from patent - US6126807A - Process for making sodium gold sulfite solution - Google Patents
1. A process for producing a sodium gold sulfite solution, comprising:
(a) dissolving Ba(OH)2 in an aqueous solution of Na(AuCl4) to produce a mixture;
(b) mixing NaOH with said mixture to produce a suspension;
(c) boiling the resulting suspension;
(d) adjusting the pH of the suspension from step (c) to produce a precipitate and a filtrate;
(e) dissolving Na2 SO3 in a slurry of the precipitate from step (d) to produce a suspension;
(f) heating the suspension from step (e);
(g) filtering the suspension from step (f) to produce a filter cake and a filtrate; and
(h) recovering filtrate as sodium gold sulfite in solution.