What to do with the fibers from burnt bga ram chips

[andreworange]

I have incinerated 1 kg of ram bga chips. I have sieved it all through a screen. I have my concentrated powder. My question is...what to do with all the fiber that's left? It makes since that some bond wires will b caught in it. Do i process it like the concentrate? With AR? Should i burn them more? Any advice would be awesome. I love this forum. Thanks for this wonderful place of learning.

 

[darinventions]

Place all of it in a big enough container an treat it with Hcl& Bleach with heat for one hour... then test— if result is negative for gold then rinse/ til ph of 7 an dispose with trash... since it’s just the fiber solids it won’t be any different than the fiberglass a body shop throws away,, as always the chemical wastes must be property disposed of,, there are plenty threads referring to chem disposal on the forum,,,

 

[patnor1011]

HCl and bleach on heat make no sense. Heat kill off chlorine so it won't work properly.

 

[jaminking]

Sorry to bring up an old post but I was wondering this exact thing.

I have incinerated 700g of RAM BGA chips where they did not come in to contact with naked flames. The ash contains the Si dies and a load of white fiber material. This fiber material is clogged up with the fine ash and stopping it going through the sieve. I took a sample and tried to burn it and it was pretty slow going but did look like a torch would reduce it to ash.

Is there a better way of treating this stuff?

 

[patnor1011]

Not really. Either incinerate it to ash or simply put it aside and then leach with your concentrate. It tends to go fluffy and can catch some gold wires.