Polyferric sulfate is widely used in many industries as a water purification reagent that is easily soluble in water. However, when selecting this product for use, we must judge its quality, because its quality will directly affect the use efficiency of the product, so we should understand its quality before purchase.
1. Specific gravity of polymeric ferric sulfate, i.e. density (g / ml). Generally speaking, the quality of Polyferric sulfate with a density of about 1.3 is general. When the density reaches about 1.5, it can be determined that the quality of Polyferric sulfate is superior. The density detection is also very simple. Put the polyferric sulfate directly into the measuring cylinder, put the measuring cylinder into the constant temperature water tank, and put the densimeter into the measuring cylinder after the temperature is stable, so as to detect the density of polyferric sulfate.
2. Polyferric sulfate color, according to the color of aqueous solution. You can take a glass, fill 100ml of water (about 22), and drop two or three drops of polysulfide to judge whether the quality of PFS is good or bad. The evaluation of the color diffused from PFS drops, how to show the best quality of cash yellow or red, and the second quality of green or yellow green. This method can directly observe whether the quality of PFS is good or not.
3. For the total iron content of polymeric ferric sulfate, the detection of the total iron content of polymeric ferric sulfate is relatively complex and can only be detected through laboratory experiments. For example, in the absence of detection conditions, it can be directly observed that when the total iron content is 9% or lower, its quality is inferior. When the total iron content is 13% or higher, the quality of polymeric ferric sulfate is excellent.
4. The basicity of Polyferric sulfate. Generally speaking, the higher the basicity is, the better, because with the increase of basicity, the greater the degree of polymerization is, and the condensed flocs will be large and dense, so as to speed up the sedimentation rate. However, too high alkalinity is not conducive to the removal of some suspended solids. Through experiments, Changlong obtained that when the alkalinity is between 8-16, the greater the alkalinity parameter, the better the quality.
Among them, the color, specific gravity, total iron content and alkalinity of the product are the key to ensure the quality of polyferric sulfate. Therefore, when selecting the product, we must judge according to these aspects. At the same time, we can also use pH value to ensure the product quality.