At normal temperature and pressure, a certain amount of ferrous sulfate, concentrated sulfuric acid and water were added to the flask, and different amounts of potassium chlorate were slowly added, and the alkalinity was measured after the reaction. Because adding potassium chlorate to ferrous sulfate solution will release a lot of heat, it is inevitable to consume a part of potassium chlorate and decompose it. Therefore, in the oxidation process, hydrogen peroxide is slowly dropped at low temperature, and the color of the solution gradually deepens. After many experiments, it was found that when the dosage of potassium chlorate reached 6 grams and the molar ratio of ferrous sulfate to potassium chlorate was 1: 0. 1, the color of reddish-brown liquid no longer deepened, indicating that ferrous ions had been basically oxidized, which met the experimental requirements. If the dosage of potassium chlorate continues to increase, the volume of solution will increase and the total iron content will decrease. Therefore, the molar ratio of ferrous sulfate to potassium perchlorate is 1 0. 1.

Oxidizer will affect alkalinity, and the influence of alkalinity on PFS is direct and objective. It is an important quality index of polymeric ferric sulfate, which not only affects the basic characteristics of polymeric ferric sulfate, but also is an important index that must be considered in manufacture and use. The higher the alkalinity, the better. Different wastewater treatments have different requirements for the alkalinity of PFS. Under the condition of raw water with the same turbidity and the same reagent, the flocculation effect of polymeric ferric sulfate with different alkalinity is different. The interaction between alkalinity and PFS is that the higher the alkalinity of PFS, the higher the turbidity of source water and the better the flocculation effect. It is expected that the classification and use of specific polymeric ferric sulfate will be adopted.