First gold bar!

[Acidrain]

A bit over an ounce, this is my first attempt at pouring a bar. I wasn't happy with it but when I went to re-pour, I noticed my crucible cracked in two places so it is what it is. I AM super happy with purity! Most of the buttons where refined once and I refined the lot twice with appropriate washes between. Beautiful even though it's not that great of a pour.

 

[Yggdrasil]

A bit over an ounce, this is my first attempt at pouring a bar. I wasn't happy with it but when I went to re-pour, I noticed my crucible cracked in two places so it is what it is. I AM super happy with purity! Most of the buttons where refined once and I refined the lot twice with appropriate washes between. Beautiful even though it's not that great of a pour.

Nice

 

[nickvc]

There nothing wrong with that bar… it’s yours and it’s beautiful.

 

[Shark]

Very nice.

 

[Martijn]

Beautifull!!

 

[BLACKESTFOOT]

Sweet!

 

[orvi]

gold is gold good job

 

[anarxi]

A bit over an ounce, this is my first attempt at pouring a bar. I wasn't happy with it but when I went to re-pour, I noticed my crucible cracked in two places so it is what it is. I AM super happy with purity! Most of the buttons where refined once and I refined the lot twice with appropriate washes between. Beautiful even though it's not that great of a pour.

Greetings.
Is this gold from those connectors that you bought?
If it's not a secret, is there any profit?

 

[Acidrain]

Greetings.
Is this gold from those connectors that you bought?
If it's not a secret, is there any profit?

Yes, this gold is from the pins. I still have more pins to process, a few more pounds. Yes, if I were to sell the gold it would be very much profitable! Mostly because of the way @orvi taught me to process.
You can find this process below

https://goldrefiningforum.com/threads/15lbs-of-gold-plated-pins.34142/post-373811

Edit: added a link to the process @orvi taught me

 

[Dreamer]

a Start is Reborn!

 

[anachronism]

Certainly looks good from here. Well done.

 

[4metals]

Mostly because of the way @orvi taught me to process.

This is the part where you should link others to the thread where you learned from @orvi 's wisdom. Often those threads disappear into the volume of the forum, so any attempt to reintroduce those threads may help someone.

 

[orvi]

Yes, this gold is from the pins. I still have more pins to process, a few more pounds. Yes, if I were to sell the gold it would be very much profitable! Mostly because of the way @orvi taught me to process.

This is the part where you should link others to the thread where you learned from @orvi 's wisdom. Often those threads disappear into the volume of the forum, so any attempt to reintroduce those threads may help someone.

That´s why I like this forum and this is peak example. When your bit of information help someone to be successful on their own. It does not matter if on hobby or professional level. It helped, served the purpose and knowledge was spread between more people. It is alive

Everybody can contribute like this. Even the negative result is still result - that is why I always like when we discuss ongoing process or modifications. Even if it fails, failure is still a result.

Hold on to the basics of the process I disclosed and improve it even further and of course, spread the word when you finish some experimental run

 

[Acidrain]

This is the part where you should link others to the thread where you learned from @orvi 's wisdom. Often those threads disappear into the volume of the forum, so any attempt to reintroduce those threads may help someone.

I edited to add a link to @orvi 's process.

find that link 5 posts up from here.

 

[Acidrain]

That´s why I like this forum and this is peak example. When your bit of information help someone to be successful on their own. It does not matter if on hobby or professional level. It helped, served the purpose and knowledge was spread between more people. It is alive

Everybody can contribute like this. Even the negative result is still result - that is why I always like when we discuss ongoing process or modifications. Even if it fails, failure is still a result.

Hold on to the basics of the process I disclosed and improve it even further and of course, spread the word when you finish some experimental run

Thank you @orvi , this was a real game changer for me!

 

[Martijn]

That´s why I like this forum and this is peak example. When your bit of information help someone to be successful on their own. It does not matter if on hobby or professional level. It helped, served the purpose and knowledge was spread between more people. It is alive

Everybody can contribute like this. Even the negative result is still result - that is why I always like when we discuss ongoing process or modifications. Even if it fails, failure is still a result.

Hold on to the basics of the process I disclosed and improve it even further and of course, spread the word when you finish some experimental run

Like Thomas Edison: ‘I have not failed, but found 1000 ways to not make a light bulb‘

 

[4metals]

Do not de-NOx and drop with SMB, do the "dirty" drop with paired action of sulfamic acid + copper. Add sulfamic in a way fumes escaping the beaker will be colourless. If not, add more sulfamic.

This is the first I have heard of the technique of paired action with copper cementation and sulfamic additions. It is acid intensive requiring 5.5 liters of mixed acid per kilo of pins. It is also an aggressive generator of Nitrous Oxide (N₂O). If your process is done without adequate ventilation you will be quite pleased with the gold yield no matter what the recovery due to the euphoric effect of the nitrous. In any event with a proper setup, this can be an interesting approach.

 

[orvi]

This is the first I have heard of the technique of paired action with copper cementation and sulfamic additions. It is acid intensive requiring 5.5 liters of mixed acid per kilo of pins. It is also an aggressive generator of Nitrous Oxide (N₂O). If your process is done without adequate ventilation you will be quite pleased with the gold yield no matter what the recovery due to the euphoric effect of the nitrous. In any event with a proper setup, this can be an interesting approach.

Reaction of copper with nitric residues is faster than sulfamic acid action.This is also true at lower temperatures (well below boiling). Also, as nitric acid reacts with copper, it reduce to N(III) species, which are much easily reacted with sulfamic, generating nitrogen gas. Nitrous oxide is produced, but in much lower quantity as if you will actually de-NOx with sulfamic acid - N(V) is reduced to nitrous oxide by sulfamic acid, N(III) species to elemental nitrogen.

If one think about it, this technique may be modified by using urea instead of sulfamic acid - as copper will reduce nitric residues to N(II-IV) species like NOx gasses, which will happily react with urea - leaving elemental nitrogen as product. But this I did not tested - so it is only my hypothesis for now

It is more acid-intensive than AP, as your active oxidant is nitric acid - usually more expensive acid than HCl. But it consume less acid than using just nitric acid. Consumption of HCl per kg of metal (I always asssume copper for ballpark calculations) is the same if you are using AR or AP - a bit less with AP as you can have Cu(I) somewhat stabilized in solution - requiring less HCl.
I used 4L HCl as estimate per kg of metallic scrap to add enough chloride anions to stabilize metals as chlorides in solution and still having enough free acid in the pot. Nitric is another variable. In bigger batches, say 5-10 kg, everything takes more time and also temperature management is easier due to bulk heat capacity (if you know what you are doing). This way you can dose nitric slowly via dripping funnel and monitor the temperature - getting the most of the oxidizer to actually react, not just effervesce out of solution to outgas as say NO2 or chlorine. That way, we actually gone below 1L of 53% tech grade nitric few times (for kg of pins) with bigger batches.
If you are impatient, you can easily burn 1.2 L of 65% nitric for kilo of metallic scrap. Drawback is - you need to then get rid of the excess - thus using more chems or copper.

 

[Acidrain]

That´s why I like this forum and this is peak example. When your bit of information help someone to be successful on their own. It does not matter if on hobby or professional level. It helped, served the purpose and knowledge was spread between more people. It is alive

Everybody can contribute like this. Even the negative result is still result - that is why I always like when we discuss ongoing process or modifications. Even if it fails, failure is still a result.

Hold on to the basics of the process I disclosed and improve it even further and of course, spread the word when you finish some experimental run

One tweek I've done to this process is that I use "poor mans AR", ie. 8oz sodium nitrate, 480ml water and 960ml muriatic acid for every 160g of material. In a 5L beaker I can safely process 320g of material at a rolling reaction. I use this for two reasons; #1 It's more forgiving than using nitric acid and I don't need to watch it so intently. When using nitric acid, you have to REALLY stay on top of the reaction to keep it rolling and if you let it die down you're almost certain to have an eruption upon addition of more nitric. #2 It further keeps processing cost down.
Using the prilled sodium nitrate, the oxidizer is released much slower into solution than adding shots of nitric acid.
Now to go start a 320g batch of deutsch connectors

 

[orvi]

One tweek I've done to this process is that I use "poor mans AR", ie. 8oz sodium nitrate, 480ml water and 960ml muriatic acid for every 160g of material. In a 5L beaker I can safely process 320g of material at a rolling reaction. I use this for two reasons; #1 It's more forgiving than using nitric acid and I don't need to watch it so intently. When using nitric acid, you have to REALLY stay on top of the reaction to keep it rolling and if you let it die down you're almost certain to have an eruption upon addition of more nitric. #2 It further keeps processing cost down.
Using the prilled sodium nitrate, the oxidizer is released much slower into solution than adding shots of nitric acid.
Now to go start a 320g batch of deutsch connectors

THIS is peak forum keep up the good work. Notes taken.

I have some similarly sized pile of total random mix of pins that sat there for a long time... I will probably give it a shot with nitrate rather than nitric As now I am not that confined by profit margins and PM price fluctuations vs. processing time, I enjoy occasional refining much much more than before