Processing, smelting and refining gold | World Gold Council
Gold refining This refers to processes used to processes used to extract and separate the precious metals in mined material, doré, and from recycled products (jewellery and electronics). The main techniques used to remove the final impurities to create high caratage gold are summarised below:
Refining Gold | HowStuffWorks
The final stage of gold production -- refining-- involves removing impurities that remain after the smelting process. Refining companies receive doré bars, as well as scrap gold, and reliquefy the metal in a furnace. Workers add borax and soda ash to the molten metal, which separates the pure gold from other precious and less precious metals. A sample is then taken to a lab for tests, or assays, that …
Gold Refining Process - Mineral Processing & Metallurgy
Gold Refining Process. The gold occurring in the alluvium is not refined by any of Nature’s processes—but the accompanying minerals or metals are either oxidised or removed hence, in the recovery of gold from reefs impurities are often collected and introduced, thus making it of lower value than the corresponding alluvial gold,...
How Gold Is Refined: A Step-By-Step Guide - Pease Curren
The result of this process is 99.5 percent pure gold. The final step is to cast the gold into electrodes or anodes and place them in an electrolytic cell. The refiners will then pass an electric current through the cell. At the end of this process, the gold will be 99.99 percent …
How to refine gold
There are actually a few different methods of refining gold. Depending upon the quantity of gold you are working with and the desired level of purity, the two most common methods for refining gold are the use of high temperature flame and the use of chemicals to refine the gold. Refining with flame is one of the oldest methods of refining metals.
Gold Refining Techniques | Sciencing
Apr 24, 2017 · The process involves first adding nitric acid to gold, then adding hydrochloric or muriatic acid. After allowing this mixture to sit, it is filtered to remove contaminants, then treated to neutralize the acids in the solution.
How to Refine Gold (with Pictures) - wikiHow
Jul 07, 2012 · How to Refine Gold - Cleaning the Gold Add tap water to the mud remaining in your container. Pour the water into the container into which you poured the acid. Rinse the gold mud again 3 to 4 times with water and pour off the excess water. Rinse the gold …
Gold Smelting & Refining Process
Gold Refinery Slag. In general, slag from smelting process arises from extraneous materials such as rust and oxides; oxidation of elements in the charge (e.g. iron, copper, zinc); residues from fuels; fluxes employed in the process (silica, borax, sodium nitrate, sodium carbonate, fluorspar); crucible erosion.
The Art and Science of Refining Gold at Home
Feb 12, 2016 · Simply put, the trick to refining gold is to dissolve impure gold in acid such that all the impurities fall out, and then to pull the pure gold back out of your acid solution.