METHOD OF AUTOMATIC CONTROL OVER SYSTEM OF PREPARATION AND RECOVERY OF ELECTROLYTE AND DEVICE TO THIS END Russian patent published in 2013 - IPC B23H1/10 B23H3/10 C25D21/18 

FIELD: process engineering.

SUBSTANCE: invention relates to treatment of electrolyte and may be used for feeding, recovery and adjustment of electrolyte parameters. Proposed method comprises neutralising toxic compounds of chromium in electrolyte whereat electrolyte hydrogen ion exponent is reduced to pH₁ corresponding to acid medium and, thereafter, electrolyte is mixed. During second stage, hydrogen ion exponent is kept equal to pH₁ to inject definite portion of reagent to neutralise toxic chromium compound. Now, redox potential variation is controlled. If said potential increases reagent of injected again to repeat the process unless said potential does not very after injection of reagent, or decreases for sufficiently long period. At third stage, hydrogen ion exponent is increases to preset level pH₂ by adding alkali to electrolyte.

EFFECT: non-polluting process, neutralisation of hexavalent chromium.

3 cl, 1 ex