Method for the generation and use of ferric ions

摘要

A process for generating a ferric ion solution. The process includes the steps of establishing in a vessel a population of acidophilic, chemoautotrophic bacteria which oxidize ferrous ions into ferric ions; supplying the bacteria with a feed solution of ferrous ions; maintaining the pH of the contents of the vessel below 3.0; and withdrawing the generated ferric ion solution from the vessel. The generated ferric ion solution can be used to oxidize metal or ore and to solubilize metal from ore, alloys or scrap. The ferrous ions produced during the oxidation or solubilization are recirculated into the feed solution to continue the process of generating ferric ions.