Modernization of ferrate (VI) technology from the iron hydroxides

Usage of mother liquor recycling for the obtaining of Fe(VI) compounds

“…Therefore, such purification is recommended in order to reduce the cost of potassium ferrate. It should be noted that these recommendations refer only to the synthesis of ferrates from iron(III) nitrate and do not affect other cheaper iron compounds, in particular, chlorides, sulfates or hydroxides: (5) whose use in the economics may be more practical [12]. In addition, the use of 11 M potassium hydroxide solutions for recycling, proposed in [8], does not meet the requirements for modern technologies, in which it is recommended to use solutions with a higher KOH concentration [2, 5, 10].…”

“…Ferrates solutions were prepared in two ways -by hypochlorite and electrochemical methods represented in [5,7,9,12] ), made of cast iron and steel of various grades, which composition is determined by ARL 3460 Optical Emission Spectrometer (Switzerland). The polarization of the electrodes was carried from direct current source B5-47 (Russia) to control the amount of electricity at constant current integrator IPT-1 (Belarus).…”