• Please join our new sister site dedicated to discussion of gold, silver, platinum, copper and palladium bar, coin, jewelry collecting/investing/storing/selling/buying. It would be greatly appreciated if you joined and help add a few new topics for new people to engage in.

    Bullion.Forum

My results of specific types of IC chips, flatpacks and BGA

Gold Refining Forum

Help Support Gold Refining Forum:

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
BGA VARIOUS CHIPS
All of the types og BGA chips, already separated from green bases with a heat gun. They do not have magnetic parts.
View attachment 30256
View attachment 30254
Total weight of chips - 456.9g
Number of chips - 286pcs
Avg weight of 1 chip - 1.597552448g
Gold recovered 5.2g
Gold content per 1kg - 11.381046g
Gold content per 1 chip - 0.018181818g
What is the formula you used? I have 3,800 gold corner chips saved up to process.
 
This information, the way you explained your process, the numbers, pictures, everything is perfect! Thank you so much! This is literally GOLD itself.
 
I just tested a new type of chips - SMALL BGA chips, like in newer RAM memory types (DDR2/DDR3), and the similar chips from motherboards and cards. They are all small, square or rectangle shaped, and all of them have a foil base with solder balls.
I soaked the chips in concentrated HCl and bring them to boil 3 times, the most of the tin dissolved. I incinerated the chips and washed with water. This time i used poorman's AR with KNO3. There was still some tin left so it took me some time to filter the solution with metastannic acid. I dropped the gold with SMB and washed the gold powder with hot water. I redissolved the gold again with poorman's AR to be sure that all of the contaminants are gone. I waited until AR was crystal clear and the contaminants like silver chloride and metastannic acid was settled at the bottom, then i carefully decanted the AR solution through the filter paper and dropped the gold with SMB again. I rinsed the gold powder with hot distiled water 3 times/3 times with hot HCl/3 times with hot distiled water. i dried the gold, measured it and here are my results...
View attachment 30335
Total weight of chips: 233.7g
Number of chips: 919pcs
Average weight of one chip: 0.25429815g
Gold recovered: 1.1g
Avg. gold per 1kg: 4.706889g
Avg. gold per one chip: 0.001196953g
Thank you for the info! Very good to know. I have a pile of these.
 

Latest posts

Back
Top