Determining the rational parameters for processing spent etching solutions by ferritization using alternating magnetic fields




etching solutions, waste processing, ferritization, electromagnetic activation, ferrite sediments, magnetite


This paper reports the results of studying the application of a ferritization method for the integrated purification of used etching solutions. A feature of this work is the use of energy-saving activation of the process by alternating magnetic fields. Its advantages are shown in comparison with traditional thermal activation. The influence of magnetic induction amplitude and key technological parameters of ferritization on the quality of cleaning an etching solution has been studied. The qualitative and quantitative composition of sediments obtained after the ferritization of etching solutions was investigated.

Used etching solutions are large-tonnage waste of industrial enterprises. They contain harmful pollutants that have a detrimental effect on the environment. It is promising to treat these solutions in order to obtain valuable commodity products.

It is established that with an optimal value of magnetic induction amplitude of 0.1 Tl, the degree of extraction of iron ions from the solution reaches a value of 99.99 %. The best values for the main technological parameters of the process have been determined: the concentration of iron ions in the reaction mixture is 6.6 g/dm3; pH, 11.5; the duration of ferritization is 15 min. The residual concentration of iron ions in purified solutions does not exceed 0.3 mg/dm3. Thus, according to the norms of current standards, they can be reused in production. Comparative analysis indicates the advantages of electromagnetic activation of the reaction mixture. The phases of magnetite Fe3O4 and iron monohydrate δ ‒ FeOОН were detected by the method of X-ray phase analysis in ferritization sediments. It is established that with an amplitude of 0.1 Tl, the sediment contains only magnetite. The study's results indicate the possibility of further use of sediments for the manufacture of important ferromagnetic substances.

The application of the improved ferritization process in production will achieve less energy consumption compared to well-known processing technologies

Author Biographies

Gennadii Kochetov, Kyiv National University of Construction and Architecture

Doctor of Technical Sciences, Professor

Department of Chemistry

Dmitry Samchenko, Kyiv National University of Construction and Architecture

PhD, Senior Researcher

Scientific Research Part

Oles Lastivka, Kyiv National University of Construction and Architecture

PhD, Associate Professor

Department of Technology of Building Structures, Products and Materials

Dmitry Derecha, Institute of Magnetism National Academy of Sciences of Ukraine and Ministry of Education and Science of Ukraine

PhD, Head of Laboratory


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How to Cite

Kochetov, G., Samchenko, D., Lastivka, O., & Derecha, D. (2022). Determining the rational parameters for processing spent etching solutions by ferritization using alternating magnetic fields. Eastern-European Journal of Enterprise Technologies, 3(10 (117), 21–28.