huggybear
Active member
Thank you. It's good to understand the reason why things happen the way they do.
I would just add that air is also quite beneficial from other point of view - it helps to dissolve the surface layer of copper in combination with HCL. This allow the cemented metals to more easily shed off the surface of copper, reviving fresh surface for further cementation to proceed. This is espetially crucial for PGM cementation, as the formed cement tend to adhere to the surface of copper, blocking the access of more PGM ions to the Cu.The reason for ion exchange with copper is AuCl4-, PdCl4=, are strong oxidizers. Air helps with stirring
It is always very useful to understand theoretic principles. With deeper understanding, you can much more easily solve the problems which arise along the way, be prepared that some things may happen and how to solve the possible issuesThank you. It's good to understand the reason why things happen the way they do.
This is very strange since practically all nitrates are perfectly soluble in water.Oh no...these crystals defeat the possibility of rinsing the silver from the outset. I've had to rinse the silver with HCl to get rid of the blue crystals, then essentially treat as if the whole lot is AgCl.
It’s hard to know what you mean with “this set-up” without rereading the whole thread, but I assume you mean cementing on copper.Is a magnetic stirrer with a beaker a decent "substitute" for this set-up? I understand it may not be as effective but I am looking to cement out a one-off batch of PGMs in solution.
Thanks,
HuggyBear
I saw now. That is a very nice set up, but is not very good for copper powders.Sorry, I should be more specific. I meant the copper cementing set-up described by FrugalRefiner in the original thread.
Thanks for your response. I will try cementing using my magnetic stirrer and copper powder.
Cementation of PGMs on copper is better done with that bubbling. That´s because PGM cement form thick layer on the surface of copper which does not permeate new solution to the surface of the copper. Air helps to dissolve surface copper into the solution and allow the PGMs to flake off the copper bar.Is a magnetic stirrer with a beaker a decent "substitute" for this set-up? I understand it may not be as effective but I am looking to cement out a one-off batch of PGMs in solution.
Thanks,
HuggyBear
Yes - if you only have a small amount of solution (couple liters) & stirrer hot plate & copper powder (& of course beaker) there is absolutely no reason why you can't do it this way instead of with hanging a copper bar & running a bubblerIs a magnetic stirrer with a beaker a decent "substitute" for this set-up? I understand it may not be as effective but I am looking to cement out a one-off batch of PGMs in solution.
That depends entirely on a few things ----1. How long would say a half gallon or full gallon of solution take for cementation to be thoroughly finished? Approximately of course.
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