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Cu was removed from industrial sludge by traditional and microwave assisted acid extraction. The effects of acid concentration, extraction time, sludge particle size and solid/liquid (S/L) ratio on removal of Cu from industrial sludge were investigated. The results indicated that extraction of Cu by 1 N nitric acid for 90 min at an S/L ratio of 1/20 is the most economical traditional extraction conditions;...
A new inorganic polymer, liquid poly-silicic-ferric (PSF) coagulant with various Si/Fe ratios (PSF0.5, PSF1 and PSF3 represent Si/Fe molar ratio of 0.5, 1 and 3, respectively) was prepared using water glass, FeSO 4 ·7H 2 O and NaClO 3 by co-polymerization. The pH value was measured during the preparation process, the influence of both Si/Fe ratio and reaction time (polymerization...
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