The assay / refining lab..

[PreciousMexpert]

if you need a silver assay prepare a foil boat
the same as above but do not add silver.

Hi 4metals
Now I think i see why it should be 0.4
Thanks

 

[golddie]

I want to do a small test
In a small beacker
refine the gold
the way 4metals explains it
to get like coffe grounds using nitric and water


I direct the fumes
with a glass cover so that the fumes are absorbed by the water

Now I have Au,Ag,Cu,HNO3,H20

What would be the best way to process this waste

 

[golddie]

I found the solution
dealing with waste by 4metals

He says hang a slba of copper in the spent acid and all the metal will fall.
In that there will be gold ,silver ,copper
would it make sense to put all that in Aqua Regia
and process it from there

 

[golddie]

I would like to try to process this solution but I dont know where to start.
Remember I do not have the set up or any equipment

Au,Ag,Cu,HNO3,H20

I am thinking of adding some HCL
Now I have AR
The gold is dissloved.
Before getting rid of the nitric should I have done anything to drop the silver

 

[golddie]

This is what I am going to do
I got this from Hokes book
add hcl
now I have silver mud
seperate liquid from mud
denoxx
SO2
collect gold
I am left with copper nitrate

Did I do everything right
THanks

 

[golddie]

http://goldrefiningforum.com/phpBB3/viewtopic.php?f=41&t=4789

if you look at the picture with the glass reactor there are 3 places made on top of it for openings
1 is used for the fumes to go out
another one for adding AR and other acids or inserting the tube for precipitating with Sulphur dioxide
then why have 3 openings

 

[4metals]

Because 3 neck heads are standard, usually off the shelf items so they're cheaper.

I have never gassed the gold in one of these reactors, they have to be filtered first so I just filter the acid into another container to gas it. Plus open top containers are easier to clean out.

 

[PreciousMexpert]

Tubes to connect the reactor to the fume hood
I bought some tubes from my hardware store and I see that they are too rigid for this job.
Where else would I be able to find these locally

 

[gold4mike]

Our local Tractor Supply Company store has a large selection of tubing sizes and fittings. They sell to farmers for use in applying chemicals.

 

[Refiner232121]

http://www.usplastic.com/catalog/default.aspx?catid=571&parentcatid=856
Can someone say which is the right kind for our needs

 

[golddie]

I was at the pet shop and I saw tubes that were flexible but the were black and you cant see the inside the tube

 

[golddie]

These dont look like they have stoppers but I am giving a thought about buying one
Also how would I attach the tube to the flask

http://cgi.ebay.ca/3-neck-Flat-bottom-boiling-flask-24-40-500ml-angled-/290463663097?pt=LH_DefaultDomain_0&hash=item43a0fbc3f9

There is the problem of emptying the gold once the nitric acid has removed the base metals

 

[Barren Realms 007]

These dont look like they have stoppers but I am giving a thought about buying one
Also how would I attach the tube to the flask

http://cgi.ebay.ca/3-neck-Flat-bottom-boiling-flask-24-40-500ml-angled-/290463663097?pt=LH_DefaultDomain_0&hash=item43a0fbc3f9

There is the problem of emptying the gold once the nitric acid has removed the base metals

You can probably find glsss or rubber stopper to attack the tube of get a tube large enough to slip over the neck.

Either keep the solution inside the flask or tip it on it's side to remove the soution.

 

[4metals]

Those fittings are standard female tapered joints, there are many types of different male joints to fit into them. Check a scientific glass catalog.

 

[guldspecialisten]

Very interesting post.

I handle impure silver which contains small amounts of gold and I have been looking for an exact way of assaying this silver for gold. The gold content is often around 1g for every kilo of silver.

I have tried to find the gold content by digesting 5 grams of the silver in nitric acid, but the brown residue is often contaminated by a reddish/violet precipitate probably from other metals in the silver.

Would it help to dry the precipitate in a piece of sheet lead, fold the lead and cupel it, or is there a better approach to this?

 

[guldspecialisten]

Hello 4metals. I would also like a copy of your spreadsheet in Excel if you don't mind. When I click the link i get: The selected attachment does not exist anymore.

Can you repost it?

Thanks in advance

 

[4metals]

Would it help to dry the precipitate in a piece of sheet lead, fold the lead and cupel it, or is there a better approach to this?

Yes cupellation would be my first choice.

I would also like a copy of your spreadsheet in Excel if you don't mind. When I click the link i get: The selected attachment does not exist anymore.

This isn't exactly it but it may do unless you need gold with silver by difference. Then I will have to dig a bit.

View attachment 30244

 

[guldspecialisten]

Thank you so much 4metals. I will try to cupel the gold precipitate.

I would also like a copy of your spreadsheet in Excel if you don't mind. When I click the link i get: The selected attachment does not exist anymore.

This isn't exactly it but it may do unless you need gold with silver by difference. Then I will have to dig a bit.

If you don't mind digging a bit I would appreciate if you would re upload the original gold with silver by difference spreadsheet or similar.

I appreciate your help.

 

[4metals]

The first tab on the sheet I posted is gold bullion with silver by difference.

 

[4metals]

The moderators would like to thank all of the members that contributed to the original thread upon which this thread was based, as well as those that asked questions showing what was missing. Because of the extra length and interest in this thread we have created the above consolidated version making for an easier read. We encourage all members to read, comment, and ask questions in the original thread, The assay / refining lab HERE

The Library threads should not be considered to constitute a complete education. Instead, they're more like reading a single book on the subject of recovery and refining. There is so much more information on the forum, and it is impossible to include it all in these condensed threads. Members are strongly encouraged to read the rest of the forum to round out their education.