Obtaining of purified solutions of sodium hydroxide for synthesis of ferrates(VI)
DOI:
https://doi.org/10.15587/2312-8372.2016.86444Keywords:
synthesis of ferrates(VI), sodium hydroxide, heavy metal impurities, purification, electrolysisAbstract
One of the important problems in the production of ferrates (VI) is the presence of impurities of heavy metal compounds (HMC) in the feedstock, which reduce the yield and quality of target products. Therefore, for HMC removal from alkaline solution serving as a medium for the synthesis of Fe(VI), it is proposed to use pre-processing by a constant electric current.
The study of the processes occurring in the electrolysis of concentrated NaOH solution is the aim of this research.
During experiments it was found that most of impurity metals (Fe, Ni, Pb, Sn, Zn) are discharged at the cathode with the formation of metal deposits and therefore can be easily removed from the solution. It is shown that the speed and completeness of HMC removal are significantly different. Thus, the degree of chromium extraction does not exceed 5 %, and aluminum is not removed at all. Lead, iron and nickel are fastest removed from the system.
Research of the basic laws of electroextraction for a number of metals has allowed to establish the influence of the main factors (current density J, temperature T and electrolysis time τ) on the efficiency of removal of impurities. It was shown that with increasing current density increases the completeness of the removal of impurities. T increase leads to an increase in the recovery rate, which is obviously due to the decrease in electrolyte viscosity and increase of diffusion coefficient of the discharging particle.
Decrease in the rate of decomposition of the anion FeO42− is recorded in sodium hydroxide treated with the proposed method. It confirms the feasibility of electroextraction in ferrate synthesis technologies.
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Copyright (c) 2016 Дмитрий Аркадьевич Головко, Владимир Георгиевич Нефедов, Игорь Дмитриевич Головко, Людмила Васильевна Шевченко
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