The research status on the composition

structure and leaching stability of scorodite

a well known arsenic solidification mineral

was reviewed. The scorodite samples prepared under different conditions had varying compositions due to the inclusion of sulfate together with the change of crystal water amount. Two structure models of scorodite were proposed as bidentate binuclear model and bidentate mononuclear model separately

but there was controversy on which one being true. The solubility product of scorodite fluctuated between 10-21.17and 10-25.83. The leaching stability of scorodite was higher in weak acidic (pH 2-6) solutions under oxidative conditions than that in strong acidic and alkaline solutions or under reductive conditions. Thus

it was concluded that scorodite could be stockpiled safely but in weak acidic (pH 2-6) and oxidative environment.