It is not difficult to clean technical silver from impurities at home, you just need to follow the safety rules. You can buy reagents for this procedure at hardware stores.
Necessary
- - an ingot or pieces of unrefined silver;
- - concentrated nitric acid;
- - concentrated hydrochloric acid;
- - sodium bicarbonate (baking soda);
- - a source of open fire;
- - a special oven or other device capable of maintaining a temperature of 1000 degrees Celsius.
Instructions
Step 1
Pick up a piece of silver for cleaning. Remove all excess (plastic parts, polymers, crystals) from the surface of the object to be cleaned. Divide a piece of silver into small portions of 1-3 grams.
Step 2
Pour about a tablespoon of 30% (by volume) nitric acid into a glass jar. Now throw the first dose of silver into the acid and wait for it to completely dissolve.
Step 3
Add the next portion of the metal - and so on, until all the silver is dissolved. Acid can be added if necessary. As a result, you will get a clear solution.
Step 4
Heat the resulting substance to 70 degrees Celsius and, stirring constantly, start pouring in ten percent hydrochloric acid in a thin stream. A precipitate will appear. Continue stirring and adding acid until no precipitate forms.
Step 5
Cool the solution to room temperature - the sediment will be at the bottom. Place the container with the resulting substance overnight in a dark place.
Step 6
Filter and dry the resulting precipitate. Then fuse it with sodium bicarbonate (baking soda) at 1000 degrees Celsius. Take about 1.5 grams of baking soda per 1 gram of silver.
Step 7
Cool the melt. Now wash the metallic silver from the plaque on its surface with ordinary tap water.
