METHOD FOR PRODUCING SCORODITE

摘要

PROBLEM TO BE SOLVED: To provide a method for producing crystalline scorodite with a larger crystal grain from a raw material liquid with low As concentrations.SOLUTION: The present invention provides a method for producing crystalline scorodite from an acidic aqueous solution comprising pentavalent As ions and divalent and/or trivalent Fe ions. In the method, while setting a concentration of the As ions in the acidic aqueous solution at 10 g/L or less, the As ions and Fe ions react with each other in the presence of scorodite seed crystals with an average particle size of 15 μm or more to produce crystalline scorodite.SELECTED DRAWING: Figure 2