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Measures to be taken after hydrolysis of polyferric sulfate

How to reflect the stability and reliability of hydrolysis of polyferric sulfate(PFS)? In order to obtain polymerized ferric sulfate products, fe3+ obtained by acid dissolution reaction needs to be hydrolyzed and polymerized. In this case, what measures should we take after the hydrolysis of polyferric sulfate? This requires us to understand the experimental steps after the hydrolysis of polyferric sulfate.

1. Determination of fe2+ in product polymerized ferric sulfate

Take 5ml of Polyferric solution, add it to a 250ml conical flask, dilute it to 100~150ml, add 10ml of sulfur and phosphorus mixed acid, cool it, add 5~8 drops of sodium diphenylamine sulfonate solution, and titrate it with K2Cr2O7 standard solution until it is stable purple.

2. Detection of alkalinity

a. Use a pipette to take 1.00mL of Polyferric solution and put it into a 250ml conical flask.

b. Accurately transfer 25.00ml hydrochloric acid with a pipette, add 20ml of CO2 free distilled water, shake well, cover with a watch glass, and place at room temperature for 10 minutes.

c. Add 10ml of potassium fluoride solution and shake well. Add two drops of phenolphthalein, and immediately titrate with sodium hydroxide standard solution to light red as the end point. (or titrate to pH value of 9.0~9.5).

d. Use CO2 free distilled water for blank test.

Practice has proved that ordinary polymerized ferric sulfate is difficult to achieve the expected purpose in most cases. Generally, it is necessary to carry out dosage form selection tests according to the medium and place of use to determine the appropriate technical dosage form and initial dosage, and then carry out industrialized dynamic tests to determine the best dosage point and the best dosage range, so as to facilitate the continuous expansion of the application scope of polymerized ferric sulfate in the mining and metallurgy field.

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