Refining is the final stage in the production of gold after removal of impurities that remain after smelting. Refining can be done in a furnace or by acids. Refining companies usually receive gold in the form of bars and scrap. They liquefy the metal in a furnace. The gold refiner adds soda ash to the metal which is molten and that separates the pure gold from the lesser precious metals.
In many cases, it so happens that a jeweler can also be a smelter. He or she can refine the metal in-house. The metal to be refined will most probably be in the shape of nuggets. These nuggets are placed in a graphite crucible so that it can withstand severe heating conditions for melting.
To begin with, the aurum recycler aims an acetylene torch to melt the nuggets thoroughly. Once they are melted, they are then cooled so that they can harden and be treated with acids. Nitric acid and hydrochloric acid in concentrated form are used for this process.
The requirement for every ounce of the precious metal is about thirty milliliters of nitric acid and one hundred and twenty milliliters of hydrochloric acid in container capacity. The acid is poured through filter funnels. The containers could be Pyrex pots or heavy gauged plastic buckets. The reaction time that is generally allowed for the acids by the metal recycler is generally to keep the solution overnight until all fumes are dispelled.
To this acidic solution, two more things are added. One is urea and the other is a selective precipitant. The urea mixture has to be a pound per every heated water quart. The precipitant is then added to boiling water; one quart per ounce in terms of the dissolved metal. The mixtures are added to the acids gradually. It takes almost thirty minutes for the solution to have an impact on the dissolved metal particles.
When the metal particles start to separate, the acid takes on a muddy color and the dissolved metals are taken for test. This test is carried out by the immersing a stirrer in the acid and then placing few drops of that acid on a paper towel end. A detection liquid for precious metals is then dropped on those acid spots. The objective of the assayer is achieved if the color turns to muddy amber.
The precious metal purifier then adds tap water to the dissolved mud like particles that remain in the container. The mud is rinsed and the excess water is poured away. The particles are then rinsed with aqua ammonia. White vapors will be released from those mud particles. The ammonia is rinsed with distilled water.
The metal particles are placed in a beaker once the draining of the distilled water is over. The gold refiner allows the beaker to slowly heat on a hot plate till the metal particles transform into powder dust. This dust is then removed on multiple layers of paper towel. It is then wrapped carefully in those towels before being soaked in alcohol. After they are dried again, they are poured again into a graphite crucible to be melted again to attain form purity.
In many cases, it so happens that a jeweler can also be a smelter. He or she can refine the metal in-house. The metal to be refined will most probably be in the shape of nuggets. These nuggets are placed in a graphite crucible so that it can withstand severe heating conditions for melting.
To begin with, the aurum recycler aims an acetylene torch to melt the nuggets thoroughly. Once they are melted, they are then cooled so that they can harden and be treated with acids. Nitric acid and hydrochloric acid in concentrated form are used for this process.
The requirement for every ounce of the precious metal is about thirty milliliters of nitric acid and one hundred and twenty milliliters of hydrochloric acid in container capacity. The acid is poured through filter funnels. The containers could be Pyrex pots or heavy gauged plastic buckets. The reaction time that is generally allowed for the acids by the metal recycler is generally to keep the solution overnight until all fumes are dispelled.
To this acidic solution, two more things are added. One is urea and the other is a selective precipitant. The urea mixture has to be a pound per every heated water quart. The precipitant is then added to boiling water; one quart per ounce in terms of the dissolved metal. The mixtures are added to the acids gradually. It takes almost thirty minutes for the solution to have an impact on the dissolved metal particles.
When the metal particles start to separate, the acid takes on a muddy color and the dissolved metals are taken for test. This test is carried out by the immersing a stirrer in the acid and then placing few drops of that acid on a paper towel end. A detection liquid for precious metals is then dropped on those acid spots. The objective of the assayer is achieved if the color turns to muddy amber.
The precious metal purifier then adds tap water to the dissolved mud like particles that remain in the container. The mud is rinsed and the excess water is poured away. The particles are then rinsed with aqua ammonia. White vapors will be released from those mud particles. The ammonia is rinsed with distilled water.
The metal particles are placed in a beaker once the draining of the distilled water is over. The gold refiner allows the beaker to slowly heat on a hot plate till the metal particles transform into powder dust. This dust is then removed on multiple layers of paper towel. It is then wrapped carefully in those towels before being soaked in alcohol. After they are dried again, they are poured again into a graphite crucible to be melted again to attain form purity.
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