gold and silver leaching process improvement with thiourea solutions

摘要

"IMPROVEMENT OF THE GOLD AND SILVER LEACHING PROCESS WITH THIOURÉIA SOLUTIONS". The present invention relates to the mineral treatment and mining industry. Specifically, it refers to a solution composition that allows the use of thiourea. Specifically, the patent relates to a process for forming a solution that improves, on the one hand, the rate of extraction of gold and silver, minerals and other materials containing them, improving the stability of the thiourea in the solution. leaching and, on the other hand, direct electrorecovery of said metals from the aforementioned solution. The invention is a leach solution which has previously or simultaneously undergone controlled electrooxidation to produce formamidine disulfide (FADS), which acts as an oxidizing agent for the gold and silver containing mineral phases. In the preferred mode, FADS is present in 10% to 30% of the total thiourea contained in the solution, with electrodeposition of the metals made in the same cell (cathodic compartment) in which FADS is formed (anodic compartment).