Effect of manganese compounds on synthesis of ferrates(VI)

Abstract

Технологии органических и неорганических вещесТв 69 Technology audiT and producTion reserves -№ 3/4(23), 2015, © Головко Д. А., Головко И. Д.

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

“…It has been established that the main impurities in the liquid phase are manganese and chromium oxoanions (MnO 4 2-, CrO 4 2-) ( Table 2). Table 2 The content of manganese and chromium oxoanions in the mother liquor after electrosynthesis These results do not go against the works [6,10,13], which inform about the inclusions of manganese and chromium in the crystalline ferrates prepared by electrochemical and chemical methods.…”

“…Therefore, in order to eliminate the negative effect of insoluble Co, Ni, Cr, Mn compounds, etc., contained in the sludge [10,13] and the transition of some its components (Cr, Mn) into the liquid phase, it is necessary to reduce the contact time of the latter with the mother liquor, for example, by means of periodic or continuous filtration.…”

“…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]. Moreover, it can be assumed that such low values of the yield of the target product, obtained in [8] are also due to the accumulation of soluble and insoluble heavy metal compounds in the system, the formation of which is justified in [10,13].…”