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The method is actually an old, tried and true method that is not widely touted due to the use of sulfuric acid and the patent directions for use. Developed to refinish the silver plating on musical instruments without damaging the instruments base metal. The patented method uses heat which increases the danger of any accident that may happen. In my personal opinion, it is no more dangerous than a sulfuric acid gold stripping cell.Stripping and reclaiming silver plate sound interesting. Have you developed a technique that is economical?
Time for more coffee.
The most reliable way that I know of reducing silver sulfate is smelting. It is much easier to do when all there is in the sample is silver sulfate.In your video you mentioned a method of reducing silver sulfate to silver. Does one of your videos explain how to do that?
Geo - don't you mean sulfideThe most reliable way that I know of reducing silver sulfate is smelting
Yes, Sulfide. Thank you.Geo - don't you mean sulfide
Silver sulfate (if I am not mistaking) is silver in solution such as plating solutions & picture/x-ray fixer solutions
The silver from sulfate solutions is then cemented out using steel wool reducing the sulfate to sulfide
The (black) silver sulfide is then further reduced to silver by smelting with iron (nails or rebar) and 50/50 borax/soda ash for the flux (producing iron sulfide)
The iron sulfide then slags off to the flux so when you pour the smelt to your cone mold the near pure (if not pure) silver then settles to the bottom of the cone mold with the slag (borax/soda ash/iron sulfide) on top of the silver
The slag is then knocked off the silver after the poured smelt has cooled
Sulfate (a solution) first needs to be reduced to sulfide (a solid) then further reduced in a "high temp" ion exchange --- kind of like cementing silver from a nitrate solution with copper except iron is used as the reducer (ion exchange) in the smelting
Are you just talking about the 95/5 method sulfuric / nitric?The method is actually an old, tried and true method that is not widely touted due to the use of sulfuric acid and the patent directions for use. Developed to refinish the silver plating on musical instruments without damaging the instruments base metal. The patented method uses heat which increases the danger of any accident that may happen. In my personal opinion, it is no more dangerous than a sulfuric acid gold stripping cell.
Correct (true) like any metal "dissolved" into a solution - it can be evaporated down to produce a solid crystalline "salt" of the metal originating as a solution - it makes for easier/safer/cheaper shipping/handling of the product from the producer to the user where the user can then re-hydrate the solid salt to a solution where a solution is needed (such as for plating or photo fixer ect.)In fact, silver sulfate is a white powder that you can buy from chemical supply companies.
Cyanide is not for the beginner for certain and I found that trying to make some gold plating solution on my own, cyanide is hard to get without jumping through some hoops. Well, unless you are buying it by the pallet it seems.Geo - just curious - for recovering silver plating why not go with cyanide leaching
This is not an electrolytic process. The acids used in this combination and quantities allows for the silver to be dissolved but not the base metal by simple immersion. It will strip any where the acid can reach. The silver is recovered from solution by adding HCl in small amount until no more silver chloride forms. The silver chloride settles quickly. Much faster than it would from an AR solution or even nitric acid solution. If the process is done correctly, all of the nitric acid is consumed in the process. The sulfuric acid can be reused by heating the sulfuric acid and evaporating back to the starting volume. This removes any excess liquids from the nitric acid or HCl. Personally, I don't filter. I decant as low as possible. The silver chloride tends to make some nice solid clumps instead of a fine powder.How do you actually recover the silver? I cannot imagine trying to settle silver chloride out of concentrated sulfuric, or filtering silver chloride from concentrated sulfuric. And I have the glass wound filters for it.
The biggest problem I've always had with any anodic stripping method is that it doesn't get in to the grooves well. And most of run of the mill silver plate isn't exactly perfectly flat surfaces. I can see where it would work well on instruments though.
It's also not cheap enough to be worthwhile unless you are buying it by the pallet quantity (you can get it by the barrel reasonably cheap). Quite a bit of cyanide is destroyed in the process. Then on top of it you have the cost of disposal.Cyanide is not for the beginner for certain and I found that trying to make some gold plating solution on my own, cyanide is hard to get without jumping through some hoops. Well, unless you are buying it by the pallet it seems.