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

[jeffkennedy462]

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.

 

[adam mizer]

What is the formula you used? I have 3,800 gold corner chips saved up to process.

Best is to read the whole thread.
There is a ton of information to check.
Your answers should be in here.

 

[Yggdrasil]

What is the formula you used? I have 3,800 gold corner chips saved up to process.

Welcome.
And Adam gave good advice.
Additionally Tzoax has not been here since 2021.

 

[DC Willi]

This information, the way you explained your process, the numbers, pictures, everything is perfect! Thank you so much! This is literally GOLD itself.

 

[DC Willi]

Welcome.
And Adam gave good advice.
Additionally Tzoax has not been here since 2021.

Oh no where is Tzoax!!!! Praying good health, success, and prosperity for our great teacher

 

[Yggdrasil]

Oh no where is Tzoax!!!! Praying good health, success, and prosperity for our great teacher

Yes I agree.
We hope he is with good health.

 

[TheDirtMerchant]

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.

 

[Yggdrasil]

Thank you for the info! Very good to know. I have a pile of these.

Welcome to us.
Sadly we have not seen Tzoax since summer 2019 so he will likely not answer.