The research study of energy efficient ferritization treatment of exhausted etching solution
Keywords:
etching solutions, ferritization, activation, ferrite sedimentsAbstract
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
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