TECHNOLOGICAL INDICATORS OF THE CATHODIC PROCESS IN THE REGENERATION OF USED SULFO-ACID SOLUTIONS FOR ETCHING STEEL

The current state of regeneration sulfate solutions was analyzed, it established that the existing physico-chemical methods do not solve problem sulfuric acid, but only neutralize it, for transfer according to standards MPC neutralization and into sewage system with subsequent disposal. It has been confirmed is advisable carry out by an electrochemical method using a three-chamber electrolyzer, when solution fed middle chamber, concentration regenerated acid increases 180-200 g/l, simultaneous iron deposition, yield 65-70%. This reduces waste allows switching closed cycle on acid. found in process digestion, decreases from 2.0 0.5 mol·dm-3, (II) accordingly. Under conditions decrease its chemical activity also interacting oxides hydroxides. To increase reactivity pickling solutions, temperature entire used. kinetic regularity combined cathodic processes model established. Platinum, copper carbon steel were used as cathode material. choice material based different properties these selected metals respect hydrogen reaction. main at platinum release wide range densities. At densities greater than 0.1 A/cm2, sharp potential observed due incorporation Fe2+ composition cathode-electrolyte interface, reduction potentials reached. When replacing steel, significant inhibition observed, which made possible reach iron, however, maximum rectilinear section control reduced 10 20 0C 3 times 80 0C. use reveal influence reaction course reduction. accompanied ion discharge. cathode, desorption limiting stage, leads existence layers adsorbed firmly attached surface cathode. A comparative analysis voltage-current dependences final investigated temperatures indicates effect approximately 120-150 mV. takes place mode increased kinetics both processes. 0С, sections appear voltage–voltage dependences, concentrations 1.0 1.5 mol/dm3. These areas 60 mA/cm2. ions electrolysis have Fe2+, experimentally. Since target spent itself, removal this solution, operation electrode unit determined technological indicators anodic process.