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.
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Sozhan et al. (2006) studied this question.
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