gold smelting--flux-

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Post by Guest on Thu 06 Mar 2014, 8:38 am

This is an interesting article i found on another forum which maybe of interest to members.

What do I need to do to Smelt my concentrates

Acetylene torch.
Couple of small crucibles #2,3 or 4, preferably bentonyte clay / graphite will last longer.
Your house mixed smelting flux.
tongs,saftey equipment.

Okay, what do I do
*SPECIAL NOTE* ***Wash and soak your clean blacksands with acidic acid [cider vinegar] for a day or so first.
1, Good clean blacksand concentrates.Preferably dry and ground to #70 - mesh in size.
2, Smelting Flux for precious metal, it's easy to make up a House flux for your needs.
You may have to make minor flux receipe adjustments depending on the concentrates you are planning to smelt.
Here is how. [adjust amount of total flux to your needs] use a tablespoon for measuring flux mix instead of pounds for each part.
1, anhydrous Borax, 5 parts. [regular Borax from the supermarket will do the same]
2, #70 silica sand, 40 parts. [get it at any home depot]
3, soda ash, 10 parts.
4, sodium nitrate, 20 parts [oxidizer].
5, Now mix all of this together and store for when needed in a closed container,"keep it dry".
6, When ready to smelt your cons, add 1 to 2 parts of Flux to each part of Concentrates. Mix well and put the heat to it.
7, Put flux/cons mix into crucible and dampen with rubbing alcohol.
8, Fire up with a torch.
9, Once upto good hot temp take it upto 2000*F and hold until molten bright yellow white.
10, Prepare pour [ I use cast iron] mold by drying it out and heating it up [few hundred degrees].
Special Point, if the pour is to thick add some more borax to thin it out.
11, Get on all of your saftey gear, face mask,long sleeve gloves, apron also have a fire extingusher.
12, Once ready to pour, put grabbing end of tongs into torch flame for a few seconds to heat them up, [avoid themal shock to crucible].
13, Now grab crucible and begin to pour into mold in one continuous pour.Make sure you have enough mold for "ALL" of the smelted material.
14, Once poured, set cucible on warm surface, not on cold [thermal shock].
15, Let mold cool, let crucible cool and be sure you turned off the torch.
16, When cooled gold will be in the bottom, borax glass on top, pop it out and flip it over. Theres your Gold. Tap gently and it'll come apart.


Okay, what NOT to do

1,Work over concrete, it explodes when hit with hot metal.
2,Never put hot on cold, thermal shock causes real problems.
3,Stay away from water also clear over head area from falling foreign material [boom].
4,Work area all cluttered up with obstacles. You drop it and its all over, burn to the bone even death.
5,Let spectators into your immediate working area.

Why is Smelting so important

Its a known fact that there can be 4 - 10 times more Gold in your concentrates than the visible Gold that you can see and recover. There are several ways to recover this material including leaching, smelting and others. But one of the most practicle and proven methods is to smelt the concentrates. Remember one thing, when smelting, you are now a chemist as well as a Gold Prospector. And careful attention must be paid to what you are doing at all times. A mistake can mean serious consequences too and include even death.
Now to finish up with the process.

1, Once cooled down [several hours] flip mold and pop out the cooled pour.
2, You will see a layer of precious metal on top and a layer of Borax/silica glass below melted together.
3, using a small hammer or mallet, strike the edge of the metal and it'll separate from the glass.
4, That is your Gold with possible silver and platinum mixed in.
5, All of the other metals will have either burned off or will be suspended in the Borax/Silica glass layer.

remember not to hurt yah self or blow yah self up.

regards
oneday


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Post by goldfinder1 on Tue 22 Apr 2014, 11:01 am

Great tip on the flux composition. Just used supermarket borax previously. Did seem to work OK. Will try your mix next time.

goldfinder1


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Post by martinjsto on Tue 22 Apr 2014, 1:31 pm

very interesting Ray, thanks for posting. so are you smelting your concentrate that has no visible gold to recover the fines too small to pan out? . makes you think how much could be recovered from all the old tailing piles around.

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keep safe out there
Martin
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Post by albo on Tue 22 Apr 2014, 6:39 pm

Very thorough, ,if borax was light at the time ,dollied quartz can suffice , gets most & any poofteenth of gold left goes to the poverty pot later for the chrissy pss .
albo
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Post by Guest on Tue 22 Apr 2014, 6:53 pm

I use it when I smelt very small gold nuggets..

regards
oneday

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Post by albo on Sat 26 Apr 2014, 9:26 am

are jeez ray don't tell em that one , but if you do buy the small metal pyramids , cylinders off the jewellers suppliers , shake the shite out of em for 1/2 hour & bingo .... so they tell me of course . Laughing 
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