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urbanminer

Sulfides

47 posts in this topic

Geowizard

 

You did a great job of explaining the same type of scenario, that i just described.

 

But covering the same ground again, seems like a silly waste of time for a wizard, and redundant.

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Gambrinus,

 

It's called "discussion".

 

Often times members of a forum have similar experience and that experience supports comments made by other members.

 

Things that seem silly or redundant to "really smart people" like yourself may reinforce a concept and help others to understand.

 

- Geowizard

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Except on an extremely tiny scale, smelting your own ore is not an option for US miners.

 

The process emits lots of pollution unless you control it with pollution control devices.

 

Emission control devices and the necessary permits are extremely expensive.

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Admittedly smelting in outside my experience, but I have read a lot.

One thing that struck me about the use of electric assay ovens and sulfides was the driving off of the SO2 which attacked the nichrome wire. Though the books said it could be done, it was recommended to not make a practice of it.

 

Assaying only melts out 29+ grams at a time, which should be worth it as a smelter if you were getting a few grams of PMs per melt against the cost of replacing the heating element. But like I stated earlier, smelting is outside my experience. I just sell to the refiner and avoid the limited ROI of doing it myself.

 

Comments?

 

I get my nichrome wire from:

jacobs-online.biz

he also has a nichrome wire gauge/amperage/temp calculator online as well.

 

eric

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Fireware;

 

Check out fireware at prospecting shops like A&B Prospecting or Legend  - What do you suppose customers use a #16 Silica Carbide Crucible for? :)

 

It will hold 68 pounds of red brass.

 

- Geowizard

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Admittedly smelting in outside my experience, but I have read a lot.

 

Eric - it seems like you are not alone in that regard. Some have not even read a lot.

 

Melting placer gold and smelting metals out of sulfides are two very, very different things. Although melting and smelting are very close in terms of spelling the words, they are not close in terms of chemical reactions.

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Chris, FYI,

 

68 pounds of Red Brass weighs the same as 68 pounds of gold. If it will hold 68 pounds of Red Brass - then it will hold 68 pounds of gold.

 

That's approximately 991.7 troy ounces of gold. Note: it's also approximately 991.7 troy ounces of Red Brass.

 

- Geowizard

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Cochran coke ovens;

 

In the early 1900's, settlers in Arizona that mined near Florence, used coke ovens to produce coke for smelting copper, silver and gold.

 

- Geowizard

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Rudimentary ovens can be constructed from refractory clay. Early Spanish

explorers constructed smelting ovens in southern Arizona to recover

silver that was shipped to Spain.

Not everything possible is legal. Not everything legal in 1715 is still legal in 2015. An interesting bit of history, but not something for modern day miners. 

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Yah Chris, I'm familiar with the differences between melting and smelting. I was just curious about what happens to the electric element when someone cranks it up with a load of sulfides. Everything I've read says it can be done, but the element takes a beating and will fail a lot sooner than if the assay oven is used for the purpose of assaying.

 

Was just curious if the differences in lifespan were that substantial.

 

 

68 pounds of Red Brass weighs the same as 68 pounds of gold. If it
will hold 68 pounds of Red Brass - then it will hold 68 pounds of gold.

No Geowizard it does not weigh the same.

68 lbs red brass X 453.6 grams = 30.8 kgs @ S.G~ 8.56

68 lbs gold X 373.2 grams = 25.4 kgs @ SG~ 19.3

However had you stated gold ore, then you would have been correct. avdp vs avdp rather than avdp vs troy.

If someone is gonna play the technical, then be prepared to get it back.

 

That being said, obviously with the higher density and using troy weights, pure gold will always fit in the same volume that an equivalent poundage of other non-PGM material weighed in avoirdupois.

 

Except the material to be refined is not SG~ 19.3

What if the material has an SG~5.5 ? Like mostly iron pyrite at 5.0 plus other stuff?

 

Then it obviously won't fit in a #16 SiC crucible.

 

-----------------

The question of course being either the required permits or the potential life-shattering fine for burning off the sulfides. Perhaps no problem in sub-kilogram size lots, but  20, 50, 100 lbs lots might attract attention.

Sure wouldn't attract any sympathy from the community, local or mining.

 

 That videos show up on the web is NOT ample evidence that smelting sulfides in the backyard is legal in all jurisdictions.

 

eric

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68 pounds avdp of molten red brass = 68 pounds avdp (991.67 troy ounces) of molten gold.

 

 I would suggest not to worry about TRIVIAL costs in smelting precious metals. :)

 

- Geowizard

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Geo, do you have any idea what 1 MM BTU is? It is a tiny amount of fuel input. While few homes have furnaces this large, many smaller commercial buildings including offices, hotels and grocery stores have heating furnaces greater than 1 MM BTU. I would urge you to speak only on topics of which you have some knowledge. Otherwise your odd statements confuse other miners. 

 

Earlier this month, I said that "Except on an extremely tiny scale, smelting your own ore is not an option for US miners."

 

What I said above is very true, in spite of your efforts to obfuscate and confuse the issue.

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Vcella is a well known manufacturer of assay ovens.

 

Do the math;

 

The largest Kiln/oven made by Vcella is the Model 200. It is a 25.68 Kilowatt oven.

 

Conversion of BTU's  to Kilowatt-hours;

 

1 Million BTU = 293 Kilowatt-hours.

 

That's equivalent to running MORE THAN TEN of the largest ovens available for one hour.

 

Engineering requires an understanding of mathematics.

 

Smelting is obviously an option for the small miner.

 

- Geowizard

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Hello to all forum participants. Sulphur dioxide is of course bad. And why no one suggested using acid, sulfuric or nitric decomposition of sulfides? There is still using bioleaching bacteria.

 

I apologize for the Google translator.

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