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Reason for precipitation in polyferric sulfate liquid

The precipitation in polyferric sulfate is mainly directed at liquid polyferric sulfate. According to customer's reaction, it can be roughly divided into two situations: the first is that the liquid polyferric sulfate product itself contains precipitate; the other is that when polyferric sulfate is used, the polyferric sulfate solution (including solid polyferric sulfate) diluted and prepared by it or with precipitate in the process of application.

The main raw materials for liquid polyferric sulfate production are sulfuric acid and ferrous sulfate. Therefore, when ferrous sulfate is not high purity, the content is too low and the impurities are too high, which leads to insufficient dissolution during the preparation of polyferric sulfate and the accumulation of iron ions. Of course, it is normal for liquid polyferric sulfate to have a small amount of precipitate at the bottom. Because even if ferrous sulfate is free of impurities, a small amount of impurities will be produced if not stirred sufficiently or if stirring time is too long.

In the production process of liquid polyferric sulfate, if excessive use of metal pipes or other corrosive vessel equipment, such as sulfuric acid, which is a strong acidic chemical, will corrode the pipeline vessel for a long time. The corrosivity of polyferric sulfate itself is also weak acidic, so there may be a small amount of corrosive debris deposits.

Liquid Polyferric Sulfate Solution or Use with Sediments

Generally, after preparation of liquid polyferric sulfate or solid products, a little precipitate will be produced when they are stationary. As the acidity of Polyferric decreases and the PH value increases when prepared with tap water, while the concentration of Fe3+ is about 1%, the insoluble yellow precipitate of Fe(OH)3 is easily formed when PH>3. When using, pay attention to putting the upper liquid into sewage, avoid putting the bottom iron hydroxide sediment into water as far as possible and increase the sludge amount.

How to produce a large amount of yellow precipitation in the course of use may be caused by excessive addition of polyferric sulfate which results in a large amount of ferric ion precipitation. It is also possible that the high basicity of polyferric sulfate affects the hydrolysis process and unstable hydrolysis forms a large amount of yellow precipitates.

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