REDOX PROCESSES AND CHEMICAL DEPOSITION TECHNOLOGIES IN FERRUM(II, III)-CHLORIDE AND SULFATE REGENERATION ETCHING SOLUTIONS OF HIGH CONCENTRATION

The method of regeneration of acid ferrum contained solutions (solutions for steel staining) with the help of alkali reagents and peroxide of hydrogen as an oxide has been investigated.The paper deals with potenciometric titration and chemical sedimentation defining the main restoring properties of high concentration etching solutions which relevant to ion metal concentration.The mechanism of renovation according to the theory of concentrated solutions has been described. As the result of studies, it is clear that ion associates are greatly different from free ions. It should be viewed defining expenditure coefficients in concentrated water systems (neutralization and sedimentation). The recommended water purification technology of rare waster in etching cycle of steel surfaces is approved implemented in the metal products factory.