Steps for refining gold include melting the gold, letting it harden, placing it in acid, and adding urea and water to the solution. The last steps involve testing the acid, cleaning and reconstituting the gold.Continue Reading
Place the gold contents in a crucible on a fireproof surface, and use an acetylene torch for melting. Use crucible tongs to pick up and pour the melted gold into an appropriate container to harden.
Wearing safety gear, place the container in an outdoor area, and pour in 30 milliliters of nitric acid for every ounce of gold. Let it sit for 30 minutes, add 120 milliliters of hydrochloric acid for every ounce of gold, and let it sit overnight.
Pour the acid in a larger container, making sure the particles don't come out with it. Boil 1 quart of water, add 1 pound of urea to it, and slowly add this mixture to the acid. Add a gold precipitant to another quart of boiling water. Add this to the acid solution, and let it sit for 30 minutes.
Poke a utensil in the solution, and place a drop on a paper towel. Add a drop of precious metal detection liquid to check for purity. Pour the acid in a clean container, keeping the mud at the bottom separate. Pour water over the mud, stir, and let it settle. Pour the excess water into the acid container and repeat three times.
Rinse the gold with aqua ammonia, rinse the ammonia from the gold with distilled water, and pour gold mud into a beaker. Put the beaker on a hot plate, and heat until it is powdery. Pour the mud onto paper towels, and soak them in alcohol. Melt the gold in a crucible again, and pour it into an ingot mold.Learn more about Precious Metals & Gems