Kovar lids etc.

[MiltonFu]

What is an efficient method to process kovar lids and other iron bearing CPU lids?.
1. Hot nitric (70% diluted)
2. Hot sulphuric diluted
3. Straight AR.

Thanks in advance.

 

[qst42know]

If you have many you might consider a stripping cell.

A foot of 10 gauge stranded wire peeled and unwrapped you can hang all sorts of plated items.

 

[Lino1406]

Why not HCl/H2O2 ?

 

[Barren Realms 007]

Why not HCl/H2O2 ?

Because if you do it with a cell you will have to deal with less fluids, it is quicker if you have a large quantity and are not use to nitric or AR. There will also be less of a mess to deal with and less chance of you loosing values if you are paitent and follow the guidelines and procedures laid out here on the forum.

 

[Oz]

For what its worth I see advantages and disadvantages to both.

However for someone new to this game I would favor Lino's comment. Using a stripping cell, dealing with concentrated sulfuric, and the sludge it creates, is not a beginner project.

 

[MiltonFu]

Is there a consequence or any losses using AR as opposed to the methods mentioned?.

 

[Lino1406]

Will dissolve it completely, together with gold, while H2O2 may lift most of the gold without complete dissolution of iron. HNO3 passivates iron

 

[qst42know]

Gold dissolved in dirty AR there is always a risk of losses. It precipitates in very fine particles and very slowly.

What does report to the bottom carries enough base metal nitrates with it to digest a good percentage of your gold in the first HCL rinse.

 

[Anonymous]

kovar itself has to be worth something right? I mean cobalt is 48.00 a pound last I checked.

JIm

 

[jimdoc]

Everything is worth something to the right people.
Here is one website;
http://www.monicoalloys.com/kovar_scrap.html

Jim

 

[qst42know]

So whether you need to buy alloy scrap or sell a quantity of alloy scrap,

There is the key word in their web site. How many lids would it take to qualify as a quantity?