Gold refining refers to the processes used to extract and separate precious metals from minerals, dore and recyclable products such as jewelry scrap and electronic waste. Precious metals such as gold, silver, are obtained separately and with high purities through refining systems.
Depending on the amount of gold working and the level of purity desired, the two most common methods of refining gold are the use of high temperature flames and the use of chemicals to refine the gold.
Using acid to purify gold is the most common and simplest approach to removing any impurities from this precious metal. Gold or precious metal-containing material is dissolved by processing with various chemicals. The most common method used in gold refining is dissolving with aqua regia. It is preferred more because of the chemical is find easy and cheap. Especially the gold can recovery from e-waste, mining, and scrap jewelry by this way. Any precautions are taken to ensure the complete recovery of gold from the aqua regia solution, and the correct choice of the gold reducing chemical is also very important part of this gold recovery process.
Gold and Silver Refining
During the gold refining, which is using aqua regia method, it is taken into rotating chambers (tumblers) to dissolve the gold that is added to various solutions. The dissolved gold or precious metals are sent to the sedimentation tanks after being filtered, and gold, silver, metals are precipitated in different tanks. The gold refining system operates under vacuum and all the charging and discharging steps are carried out very easily with vacuum.
The waste gas released during the process is washed in scrubbers and released to the environment in accordance with the standards. The wastewater resulting from all operations is processed in the treatment unit and becomes in accordance with the standard. the process takes place completely safely.
Precious Metal Refining
99.99% pure gold is produced with the gold refining system. However, gold electrolysis must be performed to produce 99.999% pure gold.
After gold refining process, fire assay laboratory refers to the processes used to determine the composition of the products or jewelry, bar, coin and measure the proportion of precious metal content.