A Test of Recovery of Cr3 in Sludge from Tanneries
tract:The recovery and reuse of Cr3 in the sludge from tanneries were tested.The results showed:the total recovery rate of Cr3 depended largely on whether the oxldation of Cr3 was suffcient or not.When n(H2O2):n(Cr3 )was 7.5,pH=10,temperature was 60℃ and reaction time was 30 min,the oxidation rate of the Cr3 in the sludge was close to 90% and the total recovery rate was over 80%.
Key WOrdS:sludge from tannery;sludge treatment;metal chromium;chromium recovery
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