Abstract: Three series of polyaluminum chloride with aluminum concentration 2.50 mol/L(A,C,D series)have been prepared under simulated industrial production conditions,and a series with Al concentration 0.150~0.336 mol/L(B Series)has been obtained when a low-speed alkaline titrimetry used.The test results of transmission electromicroscope indicate that the particles of A,C and D series specimens are in the dispersing state,and no particles appear in the flocculating mass and branching state,while the part...