Дослідження енергоощадної феритизаційної переробки відпрацьованих травильних розчинів

Results of the research study on application of the ferritization method for integrated treatment of exhausted etching solutions are presented. A specific feature of the study is associated with the use of energy efficient activation of the process by alternating magnetic fields at ambient temperatures and its advantages compared to the traditional thermal activation are shown. Exhausted etching solutions represent a large-tonnage waste flow from industrial facilities and contain hazardous pollutants that have a detrimental effect on the environment. Treatment of these solutions to obtain valuable marketable products is a promising option. Influence of the magnetic induction amplitude on quality of treatment of exhausted etching solutions was studied. At the optimal value of the magnetic induction amplitude of 0.1 T it was found that the degree of removal of iron ions from the solution reaches 99.99%. The best pH value, as an important technological parameter of the process, was found to reach 11.5. At the same time, residual concentrations of iron ions in the after-treatment solutions do not exceed 0.3 mg/dm3; according to the applicable standards, such water can be reused in production processes. Qualitative and quantitative composition of the sediments obtained after ferritization of exhausted etching solutions was studied by X-ray phase analysis. Ferromagnetic phases of magnetite Fe3O4 and iron metahydroxide δ-FeOOH were detected in these sediments. It was found that the sediments contains the maximum amount of magnetiteat amplitude of 0.1 T . The study results suggest a possibility of further use of the ferritization sediments for production of important ferromagneti substances. Application of the improved ferritization process in industrial production settings will allow to achieve a lower energy consumption compared to the known treatment technologies