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...