.
Aqua
Regia
THE DANGERS OF AQUA REGIA: When adding aqua regia to ore, there can be use a
red gas given off; THIS RED GAS CAN KILL
Sometimes the ore will bubble over, so watch it carefully.
Use the aqua regia in an open area and it to the ore very slowly.
This can cause serious illness or KILL YOU!
Use a vent hood with an exhaust fan or simmer in the open.
Hydrochloric acid is very dangerous. It can burn to the
bone and is extremely painful.
In most cases, it has burned before you know it.
Nitric acid can be absorbed through the skin, causing
nitric acid poisoning, which makes you very ill.
WEAR RUBBER GLOVES!
Aqua regia, nitric acid and hydrochloric acid can kill if
swallowed.
Always wear rubber gloves, plastic safety glasses and a
plastic or rubber apron.
Aqua regia can ruin your clothes and shoes.
Equipment Used
· Breaker,
coming ware or Pyrex container.
· Hot plate
or camping stove.
· Wooden or
plastic spoon for stirring. A glass rod can be used.
· Squeeze
bottle, such as a soap bottle, containing distilled water for washing the
beaker.
· Ash-free
or coffee filter. An Ash-free filter is best, but it costs more and is harder
to find.
· A plastic
funnel or strainer to use with the filter.A bottle or beaker to filter the
liquid into.
Ingredients
Used
· Hydrochloric
acid.
· Nitric
acid.
· Formic
acid.
· Sodium
sulfite or sodium bisulfite.
· Tap water
and distilled water.
· Un-iodized
Salt.
How To Use
Aqua Regia To Purify Gold
1. Place your
gold or finely powdered ore in a Pyrex container breaker.
2. Mix 1 part
nitric acid to 3 parts hydrochloric acid in a separate glass or plastic
container. When mixing the acids together, use great caution!
3. Add the
acid mixture, very slowly, to the Pyrex container or beaker containing the ore.
4. On stove
or hot plate, simmer until the gold is in solution and nitric acid is boiled
off. It will look like maple syrup and be a yellowish to orange color.
5. To make
sure all the nitric acid has been boiled off, add a small amount of formic
acid. If nitric acid is present, a reddish brown gas will be given off. Add
hydrochloric acid, if necessary, to keep the material covered with liquid.
Continue simmering until the nitric acid is gone.
6. Filter off
any solids that are not in solution through a plastic strainer or funnel lined
with a filter. Neutralize this material with lime juice and discard.
7. Add to the
liquid solution an equal amount of water.
8. Drop a
small amount of un-iodized table salt into the mixture to check for silver. If
silver is present, a white substance will fall to the bottom of the container.
This is silver chloride. Continue dropping small amounts of salt in until the
silver chloride stops falling.
9. Filter off
the silver chloride through a plastic strainer or funnel lined with an ash-free
or coffee filter.
DO NOT DISPOSE OF THE ACID SOLUTION-SET IT ASIDE!
DO NOT DISPOSE OF THE ACID SOLUTION-SET IT ASIDE!
10. Rinse the filter containing silver chloride with water.
11. Dry the filter and silver chloride with water.
12. Place the filter and silver chloride in a clay crucible and burn
the filter by lighting a match to it.
13. Cover the silver chloride and burned filter with soda ash.
14. Place the crucible in a furnace or oven and heat to a temperature
of 2100 degrees F until the silver is a smooth honey-like liquid with no lumps
in it.
15. Immediately pour the silver into a mold or let it set in the
crucible until it is good.
16. Remove the silver and wash with soap and water.
17. Take the sodium that you set aside (see step 9) and a little sodium
sulfite. The gold will start to fall. Continue to add the sodium sulfite until
the gold stops falling. You should see black specks that look like pepper. This
is gold sulfide.
18. Filter off the gold sulfide through a plastic strainer or funnel
lined with a filter.
19. Rinse the filter containing gold sulfide with water.
20. Dry the filter containing gold sulfide.
21. Put the filter and gold sulfide into a clay crucible and burn the
filter by lighting a match to it.
22. Cover the gold sulfide and burned filter with borax and place the
crucible in a furnace or oven and heat to 1950 degrees F until the gold is a
smooth, honey-like liquid with no lumps in it.
23. Immediately, pour the gold into a mold or let it set in the
crucible until it is cool.
24. Remove the gold and wash with soap and water.
25. Add ¼ cup lime juice to the acid mixture to neutralize it and
dispose of it immediately.
https://www.911metallurgist.com/blog/how-to-use-aqua-regia-to-purify-gold
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