Preparation of Polysilic Aluminum Ferric Flocculants from Bauxite Sledge and Its Flocculating Effects

The polysilic aluminum ferric flocculants were prepared from bauxite sledge.Its flocculating effects were studied by coagulating test.The properties of the flocculant,including color removal rate and turbidity removal rate were discussed.The effect of Al/Fe/Si,pH and the dosage were presented.The turbidity removal rate was above 80% in n(Al)/n(Fe)=2.0～4.0,n(M)/n(SiO2)=0.7～1.3 for treatment of the mould turbidity water.The decolorization rate was above 80% in condition that the pH was 7～9 and flocculant was 1.5 mL/L for treatment of the simulated dyingwaste water.During the n(M)/n(SiO2)=1,n(Al)/n(Fe)=2.0～3.0 in the polysilic aluminum ferric flocculants,the decolorization rate reached 90% for treatment of the industrial dyingwaste water.