The plant is entirely built in stainless steel AISI 316. It can reducing the usual time of about 50% compared to static methods. The solution is electrically heated by means of three monotube resistors, with power supply of 1500 watt each, and controlled by a temperature regulator.
The plant is used for dissolving the copper or aluminium core in hollow gold and silver articles.
The plant is provided with:
a tank containing three removable rotating baskets
a tank for rinsing with running water
a polypropylene suction hood to be connected to a fumes neutralization tower
two plate condensers for vapour condensing and for the reduction of acid consumption
This device reduces to a minimum the lowering of the level caused by evaporation of solution also allowing night use of the plant without any attending by the operator. In gold articles 14 and 18 carats, the copper core is dissolved with a HNO3 solution, whereas in silver and gold articles the aluminium core is dissolved with a NaOH solution.