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……