Precipitation phenomena in FeCl3-NaH2PO2 aqueous solutions at 245°C

Precipitation phenomena in aqueous solutions containing FeCl₃ and NaH₂PO₂ in varying concentrations have been studied at 245 °C. The composition and the morphology of the resulting particles depended strongly on the concentration ratios of the reacting ions. In the presence of small amounts of NaH₂PO₂ only hematite formed of different particle shapes. An increased addition of hypophosphite ions had two effects: first, anions of phosphorus were incorporated in the solids and, second, ferric ions were reduced to ferrous ions giving a variety of products.Supported by the Electric Power Research Institute, Contract RP-966-2.On leave from Yokohama City University, Japan.