No abstract

No abstract

No abstract

The electrochemical regeneration of chromium containing solution obtained from metal finishing industry was carried out using different anode materials (lead & platinished titanium) and cathode materials (lead and stainless steel). Effect of different parameters like anode current density, catholyte concentration, temperature, and anolyte flow rate on current efficiency was studied. At current densities of 2−2.5 A/dm2 using lead as anode at temperature of 303−313 K and anolyte flow rate of 130 − 300 cm3/min, the current efficiency of 68 − 76% with an energy consumption of 3.0 to 3.2 kWh/kg CrO3 was achieved.

The present study provides an electrochemical process for the recovery of chromium value from the solid residue of a chromium plant using electrogenerated hypochlorite. The process was studied using an in situ extraction method. The effect of various parameterssuch as pH, concentration of hypochlorite, particle size of the solid effluent, pretreatment of sludge, choice of the acid for pH maintenance, and stirringon the extraction efficiency of chromium was investigated. A significant portion (50%−60%) of the total chromium content was recovered by performing the reaction under suitable operating conditions with hypochlorite.