Continuous fe(iii) production at atmospheric pressures

A system for oxidizing ferrous iron to ferric iron, comprising:

• at least a first mixing system comprising an inlet connected to a supply of a liquid which comprises said ferrous iron and an inlet connected to a supply of a gas comprising an oxidizing agent, said first mixing system arranged for mixing said gas with said liquid into a first mix, and said first mixing system comprising a first outlet for said first mix;
• at least a second mixing system comprising an inlet connected to a supply of a liquid which comprises said ferrous iron and an inlet connected to a supply of a gas comprising an oxidizing agent, said second mixing system arranged for mixing said gas with said liquid into a second mix, and said second mixing system comprising a second outlet for said second mix;
• whereby said first outlet and said second outlet are in fluid connection with an impact zone and said first and said second outlets arranged in a facing relationship to each other,
• whereby the impact zone is in fluid connection with a container for holding a reaction fluid comprising a reaction gas, a reaction liquid and/or a reaction gas-liquid mixture, whereby said container comprises:
• a gas outlet for evacuating at least part of said reaction gas from said container, said gas outlet in fluid connection with at least one of said mixing systems for supplying the first and/or second mixing system with said gas comprising an oxidizing agent;
• and/or
• a liquid outlet for extracting said reaction liquid and/or a reaction gas-liquid mixture from said container, said liquid outlet in fluid connection with at least one of said mixing systems for supplying the first and/or second mixing system with said liquid comprising ferrous iron and/or with a gas-liquid mixture comprising ferrous iron.