Just thought I'd bump this thread to see if Hrushi is still out there to fill in some details.
4metals said:Just thought I'd bump this thread to see if Hrushi is still out there to fill in some details.
The powdered copper you use must be very fine, do you know what the mesh size is?
I do not know why you add the HCl to the process vat to test for silver instead of adding a few drops of the process solution to a HCl solution out of the process vat. Apparently the presence of a small quantity of silver chloride is converted into silver metal when melting the silver.
What analytical method are you using to determine the .999+ purity. Have you ever had it assayed by ICP?
Any more video's would be appreciated, you have an interesting setup. I would especially enjoy a video of the silver nitrate HCl testing step.
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I have not checked mesh size of copper powder but it is very fine4metals said:The powdered copper you use must be very fine, do you know what the mesh size is?
I do not know why you add the HCl to the process vat to test for silver instead of adding a few drops of the process solution to a HCl solution out of the process vat. Apparently the presence of a small quantity of silver chloride is converted into silver metal when melting the silver.
What analytical method are you using to determine the .999+ purity. Have you ever had it assayed by ICP?
Any more video's would be appreciated, you have an interesting setup. I would especially enjoy a video of the silver nitrate HCl testing step.
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golddie said:In my shop I Cemented some silver in a 4 inch jar and I have 2 blowers and I couldn't stand that smell.
I know that my system has faults but I think it was pulling that small amount of air
Here hrushi is doing the same but in a container that is about 100 times bigger and I didnt see any blowers anywhere
I appreciate the video but I say be careful Hrushi
Video are not ready but as soon as they are ready I will surly post them
4metals said:Video are not ready but as soon as they are ready I will surly post them
Thanks for following up with this thread, the video's will be interesting. I still do not know what benefit you get from adding the HCl directly to the bath to test for silver, but apparently it is doing no harm.
golddie said:In my shop I Cemented some silver in a 4 inch jar and I have 2 blowers and I couldn't stand that smell.
I know that my system has faults but I think it was pulling that small amount of air
Here hrushi is doing the same but in a container that is about 100 times bigger and I didnt see any blowers anywhere
I appreciate the video but I say be careful Hrushi
Lets say I have copper nitrate solution left over from refining silver how can I make it so that I will be able transform this into powder so it is of acceptable qualitywe don't have to buy Cu powder we can use Cu powder which we can easily get from CuNO3 which is left with us
Can I cement this with steel and than wash it with hclLets say I have copper nitrate solution left over from refining silver how can I make it so that I will be able transform this into powder so it is of acceptable quality
If I just boil it than that wont work if I cement it with another metal like steel that wont work
golddie said:Can I cement this with steel and than wash it with hclLets say I have copper nitrate solution left over from refining silver how can I make it so that I will be able transform this into powder so it is of acceptable quality
If I just boil it than that wont work if I cement it with another metal like steel that wont work
I think hrushi was referring to adding a little urea to the nitrate to neutralize the nitric to prevent the NOx from developing .I have mixed in lye in my scrubber and it smells like pesticide and I dont like it and hrushi said he uses urea to kill the brown fumes and I am wondering if I can use urea in my scrubber and is what is urea is it a safe thing
hrushi
How much urea do you add
In what quantities do you add the urea
4metals said:It seems in his posting Hirushi told us what he did so I tried it. I dissolved clean copper, not copper recovered from cementing with scrap iron which has other base metals in it, but clean copper. Then I added enough nitric acid to digest the copper and added some extra just so the acid was completely consumed.
Then I added iron slab, not steel but iron, and what came down was nice finely divided copper metal. Wash it dry it and it is just like in Hirushi's video.
I did not follow up and use the copper powder to drop silver from spent silver electrolyte, instead I used it for PGM's in spent aqua regia.
The only thing I would do differently than Hirushi would be to test for completeness of the silver drop with HCl in a test tube rather than in the tank with the silver nitrate. I can imagine some of the people I've worked with dumping in too much HCl and having a white soupy mess and saying "What happened man, I just added a little!"
I've used the same technique to clean up cement silver. It only takes a tiny amount of nitric, agitation, and time. Any silver dissolved by excess nitric is recovered in the next batch.Palladium said:After i finish a drop and remove the copper slab i add some fresh nitric to the batch, chop it up, and let it settle. This consumes any excess copper that may be trapped in the powder. When i wash the powder the wash water is used to dilute the next incoming batch for refining at the beginning of the process so it continuously repeats over and over.
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