The refining process that will be used is called “Aqua Regia”.
The Aqua Regia process is a cost-effective method of refining gold.
Aqua Regia is a chemical method used to dissolve gold. It is a combination of concentrated nitric and hydrochloric acids. Dissolved gold is then precipitated in the form of powder. Resulting gold is filtered, washed; and melted. Gold grains are made in order to adjust bar weight.
Samples are then taken for assaying in the laboratory to determine the exact purity of the gold.
Usually, the expected purity of the fine gold is 999.9 +.
Depending on the market demand gold is then either shipped as 999.9 or otherwise downgraded to 995.0. It will also produce TT bars and any other forms of gold/or silver needed by customers.
Annual production capacity will be about 90 metric tons of gold.
The refining system consists of a leaching section (rotating reactors called Tumblers), a condenser, a fume scrubber, and a precipitation section.
The whole system is installed on steel structure and is fully made of polypropylene, with an intelligent mechanism to control gold losses (if any) and to recover any remnant metal in the system.
Protection tanks are attached to the system to treat the remaining solution in order to trap any gold that may have slipped through the filter. This is done by adding Stannous Chloride to the solution.
After filtering the solution and collecting any gold found, the solution is then processed through a filter press which will hold any solid material contained in the solution (Sludge).
Below is a view of a complete Aqua Regia refining system:
Tumbler System
