Gold Refining748195

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In documenting the precious metals refining process its better understand those who have are interested in the subject.

Here's a brief answer to the question, “How do you refine gold and silver.”

First you will melt your gold scrap to create a homogeneous alloy which is then poured into shot or bar and rolled into a thin sheet so it will dissolve easily in an acid called Aqua Regia. It is then placed in an acid proof container of plastic or a glass beaker under a fume hood and covered with the aqua regia to dissolve the alloy. Once the gold alloy is dissolved it leaves behind silver in the chemical form of silver chloride that will not dissolve and must be filtered out. silver refinery After filtering the acid solution containing the gold it is diluted with cold water and a chemical is added to the filtrate, (clear filtered acid containing the gold) to make the gold precipitate, (rain down) from the solution. The gold will settle to the bottom of the container as a dark to light brown powder and after the acid clarifies it is siphoned off or carefully poured off of the gold precipitate. Then the gold precipitate is washed, dried, melted and poured into bars, or shot. This gold which you have refined using a hydro metallurgical method will be 99.9% gold. In order to produce 9995 Fine Gold it may need to be refined again. If 9999 or higher fineness is desired it will have to be refined by electroplating the gold in a bath of gold chloride and hydrochloric acid which will remove trace impurities that mainly consist of silver.

The processing of gold scrap varies not just with all the gold substance and also with the amenability of the gold in the scrap to extraction. Therefore the majority of the gold may perhaps be recovered by means of leaching techniques using cyanidation or else aqueous chlorination; also, the residue can then be treated by smelting to recover the balance. silver refinery Normally scrap that has a gold content of less than 0.1 percent, if not readily recoverable by leaching, is recycled back to a pyrometallurgical process. Metallic scrap gold from jewelry production is often melted on-site and reused.

Pure gold has practically no industrial uses other than the support for currency. Actually, no country backs its currency with an equivalent amount of gold, but to some degree the solvency of a country is equated with its gold reserves. Jewelry represents the single most important use of gold. Due to metal's softness, it is alloyed with additional metals to produce the requisite hardness and strength. Typical jewelry alloys consist of gold-silver, gold-copper, and gold-silver-copper. For the most part gold jewelry varies between 14 and 18 karats. Gold is very important in the casting of dental bridges and crowns. Here it is typically alloyed with silver and copper, although platinum or palladium is from time to time added to improve strength.

Gold refining can take on quite a few forms, all depending on the form and content of the gold that needs to be refined. silver refinery