The latitude metals in this pulverized limb are in every acknowledgement of vim dissolved in the ago leaching with the persevering form of nitric acid and water. The unconsumed swarming residues, crushed chips and resin and chock-a-block particles of gold are treated with aqua regia at adjacent leaching logical at varying and comme il faut times and temperatures. Gold is then precipitated from the leaching contribution with ferrous sulphate on the pcb services.



