Experience from Bulgaria

[plamenppp]

The chips is extremely small! I have 7-8 of these with 8 legs - they might have a lot of gold in th solder. These with the 3 legs have a lot of iron in them - I made some tests with a magnet and I had difficulties romoving them from it.

 

[goldsilverpro]

The magnetic ones are probably made of Kovar - 54Fe/29Ni/17Co. This alloy is soluble in hot nitric. They are the same type that Arthur treated in the link I gave you.

 

[plamenppp]

I remember I made a test with one one of them in 65% nitric a few months ago. It dissappeared completely. There were red/brown fumes and something black all over the solution. I think it was carbon.

 

[teclu]

.......Has anyone any idea how much gold is in them?......

....The legs are partially plated...

I do not see in picture with the four transistors, the type and the producer of these transistors but the average of the Au yield for these East European type of transistors is 11-15 mg/piece with plated legs( depends on the length of the legs) and 8-11 mg/piece without plated legs,.... what did you mean with partially plated legs ?

teclu

 

[plamenppp]

About 0.2-0.3 cm plated pins starting from the plated bottom of the transistor. The rest of the legs is not plated.
The transistors are bulgarian and they are mixed. That guy offered me also square russian potentiometers with Pd/Ag (or trimers if they are called this way) for 13 stotinki (about 0.10 USD) each. About 500 of them.

 

[plamenppp]

255 of them - 0.27 kg
I'm getting better and better in finding small gold mines.

 

[plamenppp]

Some more. 168 to be precise.

 

[plamenppp]

This is it - the micro gold mine. I need more of them.

 

[EDI Refining]

Have you started refining anything yet? Lots of misc pictures

 

[plamenppp]

A few hours ago I put about 50 transistors in nitric acid. I warmed it from time to time but not all the gold was stripped in the solution. I want to practice a little before putting everything in the nitric. I wonder will H2SO4 work as well.

 

[glorycloud]

how did you remove the tops from these "gold mines"? You did a great job getting them off it appears.

 

[plamenppp]

The upper picture shows only the good "gold mines" and I have only 50-60 of them. I have another 420 (bad gold mines) with the caps and 2 of the 3 legs removed (look at the picture). I am waiting for 2000 more of the bad ones.
Removing is time consuming job with pliers.

 

[ander]

Wouldn't be it easier to use grinder with cutting blade for steel- its like 2mm thick and cuts very fast- just cut the "shell" a little to let acid get inside. The thing I'm afraid of is acid usage.

 

[Irons]

The upper picture shows only the good "gold mines" and I have only 50-60 of them. I have another 420 (bad gold mines) with the caps and 2 of the 3 legs removed (look at the picture). I am waiting for 2000 more of the bad ones.
Removing is time consuming job with pliers.

You would do well in America. 8)

 

[plamenppp]

It is sub-zero outside. I will need constant heating. Constant heating + glass dish + liquid in the glass dish = possible breaking. The cell shoul strip all the gold exposed to the 96% H2SO4. Some ot the gold will not be exposed and will be extracted with AR or nitric during the summer.

 

[plamenppp]

The upper picture shows only the good "gold mines" and I have only 50-60 of them. I have another 420 (bad gold mines) with the caps and 2 of the 3 legs removed (look at the picture). I am waiting for 2000 more of the bad ones.
Removing is time consuming job with pliers.

You would do well in America. 8)

I have been there for two months. I worked as a mover. The crisis began and I decide to go back with enough money to cover my work&travel program. My friends stayed and spent all they had for food and some other stuff. I lost 10 kg of my weight because of the food. I prefer home-made food and chickens and a pig in my yard. I forgot to mention the donkey and the cart.

 

[glorycloud]

I found this document while searching today. I have (100) of these sensors that are new/unused.
It shows that there are layers of platinum inside the ones that I have. BUT..........
I also see where they are being offered for sale from $42 - $56 EACH by electronic component distributors!
If I can sell them at half that and not play with chemicals - that's the deal for me!!!

I will do some homework and report back on what I find out.
View attachment c15_97_0913.pdf

 

[EDI Refining]

I found this document while searching today. I have (100) of these sensors that are new/unused.
It shows that there are layers of platinum inside the ones that I have. BUT..........
I also see where they are being offered for sale from $42 - $56 EACH by electronic component distributors!
If I can sell them at half that and not play with chemicals - that's the deal for me!!!

I will do some homework and report back on what I find out.

please let us know, I have a small bin of these in as new condition....

 

[plamenppp]

The cell worked just fine. It stripped a single transistor for 4 seconds. Tomorrow I will see what is at the bottom of the 2 L glass dish full with water, 250 ml H2SO4 and gold.

 

[plamenppp]

0.2 grams from 410 plated transistors I am not surpriced. The plating was very thin and bright. Tomorrow I will change the strategy - better plated trasistors and better dark colour. The transistors will be tied in 5 like a bouquet to save time.