Gold refinery  is a   process  used   to extract and separate Gold  in mined material, doré, and from recycled products .

When Gold has just been mined from the ground, it comes with a lot of dust and other impurities which have to be removed off  to remain with the real Gold.

Soko Business Hub is one of. Uganda Gold refining companies and has been in existence for over 15 years.


The two Uganda gold refining methods most commonly employed to derive pure gold are: the Miller process and the Wohlwill process.

GOLD REFINERY  USING MILLER PROCESS: The Miller process uses gaseous chlorine to extract impurities when gold is at melting point; impurities separate into a layer on the surface of the molten purified gold. The Miller process is rapid and simple, but it produces gold of only about 99.5 percent purity.

GOLD REFINERY USING WOHLWILL: The Wohlwill process increases purity to about 99.99 percent by electrolysis. In this process, a casting of impure gold is lowered into an electrolyte solution of hydrochloric acid and gold chloride. Under the influence of an electric current, the gold migrates to a negatively charged electrode (cathode), where it is restored to a highly pure metallic state, leaving the impurities as a separate solution or residue.


Refining gold with acid

The traditional method called aqua regia (Latin for “Royal Water”) dates back hundreds of years. This method requires the use of both nitric and hydrochloric acids. Due to the corrosive nature of nitric acid, the fumes produced by this process (nitric oxides) are very harmful. Nitric acid fumes will rust high grade stainless steel in less than 1 second of exposure.

To correct this issue, we’ve developed a non-corrosive, pelletized substitute for nitric acid called MX3 Concentrate. While there are still fumes when using MX3 alone, they are limited to ordinary muriatic acid (a chemical available in most paint and hardware stores) fumes. We’ve also developed self-contained machine for people who prefer this method: the Shor Aqua Regia Refining System. It is a sealed unit with an integrated scrubbing system to even eliminate the remaining muriatic acid fumes. It also scrubs the fumes if you want to work with nitric acid based aqua regia.