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Satellite LNB PCB vs. regular Gold PCB processing

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DarkspARCS

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Post December 17th, 2011, 1:42 am

Satellite LNB PCB vs. regular Gold PCB processing

-Hi everyone!

I got a quick question about processing two types of gold bearing printed circuit boards. I'd like to see if anyone might know if in fact they would be compatable in an AP solution together, or if there are issues that may interfere with the process.

The first type is the DirectTV LNB board, located inside the core of the Dish itself. This board varies in alloy type from series to series however the constant here is that the PM content exists upon the surface, whereas a copper circuitry system also exists underneath a solder mask. This board possesses alot of SMT, which measures out to a great deal of solder being used on it., and probably other unknown properties that may spoil a batch (such as waxes, glues, etc...)

The other type is the traditional gold bearing circuit board that has the gold circuitry under the solder mask.

Can these two boards be processed together, after cleaning with a hot acid bath and a couple of rinses? Will I have to worry about my values mixing with common metals durring a hot acid wash?

Thanx for your attention on this!
Thanks for your time

- Richard
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Geo

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Post December 17th, 2011, 2:32 am

Re: Satellite LNB PCB vs. regular Gold PCB processing

if you remove the solder beforehand in hcl acid then you shouldnt have any problems mixing the boards. the other stuff you mentioned should be removed from either as best you can (especially oils or wax) the AP will work underneath any of this but could cause you problems in later refining. but all in all if you first boil in soapy water to remove the oils and as much wax as you can and then rinse and then soak in warm hcl acid to remove solder you should be good to go with AP.
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docwally

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Post January 19th, 2012, 4:40 am

Re: Satellite LNB PCB vs. regular Gold PCB processing

The best method ton recover from pcbs etc is to first incinerate the whole board and to smelt the ashed remains into a base metal bar. you can then treat the base metal bar first with nitric acid followed by aqua regia. please note that the incineration and smelting must be done in a closed circuit system - scrubbers and fume collection are important. The incineration destroys the solders by oxidizing the tin and lead which are trapped in the scrubber. they will both influence au recovery.
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Geo

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Post January 19th, 2012, 11:55 am

Re: Satellite LNB PCB vs. regular Gold PCB processing

the best is not always the simplest or easiest. most of the readers that will see this will be the hobbyist refining at home and probably wouldn't be able to have a closed circuit smelting system in the back yard.

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