Gold filled eye glasses, how to process?

[NobleMetalsRecovery]

Trying to get some ideas for processing gold filled material. What is popular here on the forum? Would like to do it without nitric acid if possible. Don't mind using sodium nitrate and sulfuric acid.

 

[Shark]

Just eyeglasses, copper(II)chloride will work pretty well.

Hot ferric chloride will work as well. With high heat it will work on fairly big pieces as well.

I often use sulfuric and sodium nitrate, it works almost as quick as nitric. I have ran as much as 4 pounds of gold filled using this method. Getting it right can be a bit hard, and getting any excess salts out is a bit more difficult than using nitric but still very doable. Often it requires decanting used up solution and starting with a fresh mix unless you have a very large beaker. It does have the advantage of being less prone to boil overs than nitric as well. (I have never tried stainless with this method, but I am very curious if it would work) If stainless will hold up, a large stew pot would be very helpful with plenty of excess space for solution.

 

[snoman701]

Cut them real small like.

I hate chemically processing eyeglasses.

 

[butcher]

When working with them it is a good idea to wear gloves, and incinerate oils, dirt, or skin tissues.

 

[NobleMetalsRecovery]

Thanks for the various responses. That's enough to help me get off in the right direction.

 

[NobleMetalsRecovery]

One more question regarding gold filled.

Could it be done using reverse electroplating?