The final stage in the production of yellow metal is the refining one. Impurities are removed after smelting. The process of refining is executed by help of a furnace or with acid treatment. Most refiners are left with scarp or bars that have to be melted in the furnace. A gold refiner adds soda ash to the metal which is melted to distinguish the pure material from the metals of lesser value.
A jeweler can also be a smelter and can refine the precious metal at his own lab. Assuming that the metal is in the form of nuggets, they can be placed inside a crucible. The crucibles are generally built of graphite that can withstand the melting of the metal.
The process of melting is taken care of by the aurum recycler with the help of an acetylene torch that is aimed on nuggets for dissolving them. The melted nuggets are cooled to harden. They are then treated with concentrated acids such as nitric acid and hydrochloric acid.
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.
Both urea and a precipitant are then added to the acid solution. The blend is in the ratio of a quart of water which is heated for every urea pound and a quart of water which is boiled. The mixture ratio is for every metal ounce before adding the precipitant. The mixture is added very to the acid on a gradual basis. The time required for the metal particles to react to the solution is thirty minutes.
After the solution works on the metal in the containers, the acid changes to a muddy kind of color. This happens when the metal particles separate. The acid among the dissolved metal is then tested in the lab by the immersion of a stirrer in that acidic solution. Drops of the acid solution are placed on the end of paper towels. The test is carried out by the assayer by dropping a detection liquid particularly for precious metals on the spots on the paper towel. When the color of the solution transforms into a muddy-amber one, then the dissolved metal is well on its way to be refined.
The purifier of metal then adds tap water to the dissolved metal particles which remain behind. Extra water is drained off after they are rinsed. The metal particles then go through treatment with ammonia water. Once this is applied, white vapors are released and caution is required to take protective action by wearing proper safety gear. Distilled water can be used to rinse the ammonia.
The mud deposits are then kept in a beaker once the distilled water is drained away. The beaker is kept on a hot plate and allowed to heat by the gold refiner until the mud develops a powder like consistency. The mud deposits are removed on to double layers of paper towels. They are then to be wrapped and soaked in alcohol. The mud has then to be placed into a graphite crucible and melted for it to take pure metal form.
A jeweler can also be a smelter and can refine the precious metal at his own lab. Assuming that the metal is in the form of nuggets, they can be placed inside a crucible. The crucibles are generally built of graphite that can withstand the melting of the metal.
The process of melting is taken care of by the aurum recycler with the help of an acetylene torch that is aimed on nuggets for dissolving them. The melted nuggets are cooled to harden. They are then treated with concentrated acids such as nitric acid and hydrochloric acid.
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.
Both urea and a precipitant are then added to the acid solution. The blend is in the ratio of a quart of water which is heated for every urea pound and a quart of water which is boiled. The mixture ratio is for every metal ounce before adding the precipitant. The mixture is added very to the acid on a gradual basis. The time required for the metal particles to react to the solution is thirty minutes.
After the solution works on the metal in the containers, the acid changes to a muddy kind of color. This happens when the metal particles separate. The acid among the dissolved metal is then tested in the lab by the immersion of a stirrer in that acidic solution. Drops of the acid solution are placed on the end of paper towels. The test is carried out by the assayer by dropping a detection liquid particularly for precious metals on the spots on the paper towel. When the color of the solution transforms into a muddy-amber one, then the dissolved metal is well on its way to be refined.
The purifier of metal then adds tap water to the dissolved metal particles which remain behind. Extra water is drained off after they are rinsed. The metal particles then go through treatment with ammonia water. Once this is applied, white vapors are released and caution is required to take protective action by wearing proper safety gear. Distilled water can be used to rinse the ammonia.
The mud deposits are then kept in a beaker once the distilled water is drained away. The beaker is kept on a hot plate and allowed to heat by the gold refiner until the mud develops a powder like consistency. The mud deposits are removed on to double layers of paper towels. They are then to be wrapped and soaked in alcohol. The mud has then to be placed into a graphite crucible and melted for it to take pure metal form.
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