giahylxag
Well-known member
Sure inquarting is the way to go
Even my friend convinced when he saw the result
Aqua Regia method with 12-13% Ag
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Even my friend convinced when he saw the result
giahylxag
Well-known member
I am currently having problem with fume. Althought I believe most of the fume are treated. Some still leak somewhere. I can smell it, not too much to bear but (the smell indicates it) there is still acid fume floating around.
The next day I see my PH papers on my desk turn light pink, there is still acid fume floating around.
How good is your suction?
Where is your exhausts?
Are you sure they are clean and not sucked back inside?
Add a moist litmus paper on each joint.
It is nice to see your journey to success.
Welcome to us.
You are adding a completely unrelated post to an existing thread.
Additionally it is a post regarding a Cyanide leach in a thread regarding AR.
Combine these two and you will most likely die.
I will delete this post in a few minutes and send you a PM in the mean time.
I looked at your video of the scrubber you built closely and realized that while your scrubber does provide visible fume extraction, it does not provide adequate exhaust for operating a refining operation.
On closer look what I do not see is the hood exhaust. When a refining hood is set up the preferred method is to have 2 actual forms of exhaust. The first is considered fugitive emissions by the EPA. What that means is any fumes that escape your scrubber. That can be the fumes when you filter a solution or when you open and pour your acids or any other refining task. These fumes are minimal and with an acceptable flow rate passing through your hood they never cause an issue. But without that constant exhaust of air, those fumes will build up as you noticed.
If left to linger in your workspace it will start to do things like peel paint off the wall, rust any steel, and many other slow to develop issues. The pH papers on your desk are an early indicator. When you are refining or treating waste or just have open containers of refining liquors in the hood it should be running.
The second form of exhaust is scrubbed emissions. That is air which passes through the fume scrubber after it is treated. You seem to have that issue taken care of for your small scale testing.
So I believe your issue is you only have 1 of the 2 necessary exhausts for your particular situation.
There are many threads on the forum about building exhaust hoods and you should find a method that works for your setup. But do not ignore this because it is a slow type of corrosion you are seeing. If you noticed it when processing small samples, it will be come very obvious (and dangerous) when you process large lots. Your health and the health of your workers should be a #1 priority.
giahylxag
Well-known member
I am processing a bigger lot today than the previous day. Around 1 oz of pure gold
I notice there a some "metallic" looking of piece that make it really hard for nitric to eat into
For example this piece
While every other pieces are settled and I see no reaction. This particular piece still reacts but wirh a much slower pace. I tried to split it by a glass rod but it appeared very hard.
I notice there a some "metallic" looking of piece that make it really hard for nitric to eat into
For example this piece
While every other pieces are settled and I see no reaction. This particular piece still reacts but wirh a much slower pace. I tried to split it by a glass rod but it appeared very hard.
You probably didn't manage to get the melt homogeneous enough.
So this part has too high Gold content for the Nitric to reach the Silver.
Take it out and put it into the next batch, or hammer it really flat and cut it to fine strips.
Then put it back after twisting them.
giahylxag
Well-known member
I used an induction furnance
Melted the gold with copper, to the point they became a button in the bottom of the crucible
Then pour it out to water
giahylxag
Well-known member
I can see some shiny gold nuggets
The result is dissapointed. Probably copper is still in there
giahylxag
Well-known member
Xrf result
One hopeful result is there is almost no gold lost after xrf
One hopeful result is there is almost no gold lost after xrf
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Golddigger76
Well-known member
Did you refine your gold powder a second time ?
giahylxag
Well-known member
No
I am trying to make 999 gold by inquarting.
AR usually the next step, but I am focus just on inquarting
I can honestly say I have never inquarted gold with copper. I usually use either fine silver, cement silver, or sterling silver. Never straight copper.
Form your results I guess you can see that it kinda works with copper but it really works with Silver.
Probably as Ygg suggested, the copper didn't mix thoroughly because you poured it too soon? Or because you didn't shot it small enough.
Your silver reserves will build up soon enough so you can always use silver and get the results you experienced the first time.
giahylxag
Well-known member
I recall that I poured the shot too soon. Most of the inquarted gold became a big mass that I had to cut it into 3 smaller pieces. I noticed the big pieces are very hard to dissolve. And they have metallic suface that I believe is gold.
All of these little bumps in the road are teaching you to be a better refiner.
Overall you have done well.
Overall you have done well.
giahylxag
Well-known member
Today I proceed this piece using AR method.
There is not many problem since I began with a very low %Ag content.
As expected the liquid is light greenish yellow
I used sulfamic acid to denox and SMB to drop gold
I didn't know how much SMB to add so I added it till the liquid became clear
This is the result
Xrf read 99.99, machine is Vanta Gx SDD, brand is Olympus
Once you get enough experience with the process you can see a color shift in the green acid when all of the gold is dropped. The green goes from a bright green to a dull green. It’s subtle and in no way eliminates a need for stannous, but it is noticeable.
