By using the hydrochloric acid pickling wastewater and scrap iron asraw materials,the polysilicic acid-polyferric chloride (PSPFC)flocculant isprepared under different conditions.By investigating the removing rate of turbidity,the resultsshow that the flocculation efficiency isinfluenced by the Fe/Si molar rate,the solute concentra-tion of Fe³⁺,and especially influenced by the reaction time.The optional technological conditionsare asfollows:the Fe/Si molar rate is1 ∶2,the solute concentration of Fe 3+ is0.6mol/L and the reaction time is40min.The advantage of the PSPFC isthat it isgood for treating the light turbidity wastewater with a wide pH range