As long as I am using an electric hot plate AND corning ware AND good lab glassware, I don't use sand. Corningware made some very tough stuff just be sure it is the correctly rated stuff. There is a thread on the forum all about it and well worth the read. I have used a propane stove and heated some of mine hot enough to see the red glow in full daylight, something that you don't need, but was good to know. I am not sure how many I have, but I use different types for different processes so have several pieces comes in handy.
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Non-Chemical AP Gold pin process question
- Thread starter PARKER113
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PARKER113
Well-known member
PARKER113
Well-known member
Thanks Shark! That's good to know. Maybe I'll lay off with the sand after I determine the corning ware is good quality. Red hot hey? Wow that's some strong stuff!
Regards,
Peter
Regards,
Peter
Did that color show up immediately or develop after you added the stannous? I would say the red color would be Platinum except for the fact that pins are rarely if ever Platinum plated.
Do you have a prepared positive gold acid standard that is about 5 ppm? If so what does that stain look like? Whatever the stain is, it isn't much!
As far as prices for a limited quantity of refining related supplies, check out Carolina Biological Supply. They are, for the most part, dealing with schools who don't pay the crazy prices Fischer Scientific charges.
Do you have a prepared positive gold acid standard that is about 5 ppm? If so what does that stain look like? Whatever the stain is, it isn't much!
As far as prices for a limited quantity of refining related supplies, check out Carolina Biological Supply. They are, for the most part, dealing with schools who don't pay the crazy prices Fischer Scientific charges.
PARKER113
Well-known member
4metals said:
Yes the color showed up right away! I tested a few other used AP solutions and my last AR liquid and they all turned clear. Meaning no metals I suppose.
I do not have a gold solution to test it with. But I will get on that pronto. I have a few 999 bars. .5 of a gram haha.
Thanks!
Peter
PARKER113
Well-known member
Here's a picture earlier this evening of the all of the gold that settled overnight. I noticed some darker, finer precipitate. I believe I read on here it's either dirtier gold, or base metals dropped from too much Smb. I'll have to re dissolve, and melt it next spring. As this is it for now with refining. I'll be indoors working on the recovery side!
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It is always good to have a positive gold standard for gold to test your stannous. 5 ppm is a dilute standard which is 5 milligrams of gold in 1000 ml of solution. At today's prices that is about 19¢ per liter. But a dilute standard will show you the sensitivity of the stannous test solution.
To put that more into perspective, if you dissolved 7.5 ounces of 14k plumb jewelry it would take about 1 liter of aqua regia. After filtering and rinsing it will be about 1.5 liters awaiting precipitation. If you use 1 drop off the end of a glass rod to drip on a paper towel for a stannous test, that drop contains 17¢ worth of gold at $1200 gold. Pretty pricey drip!
To put that more into perspective, if you dissolved 7.5 ounces of 14k plumb jewelry it would take about 1 liter of aqua regia. After filtering and rinsing it will be about 1.5 liters awaiting precipitation. If you use 1 drop off the end of a glass rod to drip on a paper towel for a stannous test, that drop contains 17¢ worth of gold at $1200 gold. Pretty pricey drip!
