Effects of pH on the formation and transformation of Fe(II)-Si coprecipitates under anoxic, reducing conditions

無酸素/還元条件におけるFe(II)-Si共沈物の生成と変化に対するpHの影響

Francisco, P. C. M.  ; 三ツ井 誠一郎 ; 石寺 孝充 ; 舘 幸男  

Francisco, P. C. M.; Mitsui, Seiichiro; Ishidera, Takamitsu; Tachi, Yukio

This study describes batch synthesis experiments of Fe(II)-Si phases under anoxic and reducing conditions as a function of pH. Solutions of Fe(II) and Si were mixed, base titrated and aged for up to 20 days at high temperature to induce crystallization. The results of the aging experiments show the formation of both Fe(II) oxides as well as Fe(II)-Si phases. The pH appear to control the transformation products, with higher pH favoring crystallization. These results may be useful in validating thermodynamic databases that predict the formation of Fe(II)-Si phases.