The synthesis of flocculant polyaluminum chloride Aluminum polyaluminium chloride on the Yellow River water turbidity rate is not added along with the dosage added to add, but within a certain range of flocculation better, the reason is that when the lack of dosage, Flocculants can not be fully touched with the impurities in the raw water, resulting in flocs after settling, there are still some not flocculation, so the flocculation is not good, and the dosage is too high, flocs between the role of bridging particles required for adsorption activity The point is flocculant wrapped, so that the required particle surface flocculation of the lack of points, leaving the flocculant adsorption bridge between the role becomes difficult, resulting in poor flocculation. Polyaluminum chloride flocculant composition: Take a certain amount of AlCl3 · 6H2O, dissolved in deionized water. Under magnetic mixing conditions, slowly add a certain amount of anhydrous Na2CO3 according to OH- / Al = 1.0. After the foam disappears completely, continue mixing 3h, get Poly aluminum chloride coagulant. AlCl3 · 6H2O and FeCl3 · 6H2O were replaced by AlCl3 · 6H2O in the molar ratio of 5:1 and anhydrous sodium carbonate was added according to OH - / (Al + Fe) = 1.0. Coagulant. The prepared polyaluminum chloride and polyaluminum chloride coagulant diluted to 10mg / L (calculated as Al2O3 + Fe2O3), spare. Effect of fast stirring speed on the flocculation of polyaluminum chloride: The flocculant is used to treat raw water with high turbidity. In order to make the flocculant put into the water evenly, it needs to be quickly mixed. Under other conditions, quick stirring Polyaluminum chloride flocculation test with different speed.