Total iron content and basicity of polyferric sulfate
Polyferric sulfate is a commonly used flocculant for water purification. The effect of phosphorus removal agent is very good. Its indicators mainly include total iron content and basicity. The following is a brief introduction to the total iron content and basicity of polyferric sulfate
Total iron content of polyferric sulfate ：
What is the total iron content of PFS? The total iron content of ferric sulfate is between 19% and 22%, and the first grade product of national standard is more than 19%. The total iron content of spray drying polymerized ferric sulfate produced by Zhengyuan is about 22%. The higher the total iron content of PFS, the more multi-core hydroxyl complexes produced by hydrolysis, the more electric charge of pollutants can be neutralized, and the stronger the adsorption bridging and network trapping precipitation effects are. The hydrogen ion concentration index of 1% aqueous solution of product is closely related to the content of total iron (with trivalent iron). The higher the content of trivalent iron, the more hydrogen ions (hydrogen nuclide protium can be regarded as proton) obtained by hydrolysis, and the lower the pH value of 1% aqueous solution.
Basicity of polyferric sulfate ：
What is the basicity of PFS? The national standard is between 8-16. The basicity of PFS produced by Zhengyuan is about 15, which can be adjusted. The basicity of polyferric sulfate depends on the amount of hydroxyl group in the product. The higher the basicity, the more unstable it is. However, the lower the basicity is, the more unstable the product will be. At the two ends of the basicity, there are charge density and molecular weight. The lower the basicity of polyferric sulfate is, the fewer polynuclear complexes are, the higher the charge density and the smaller the molecular weight; the higher the basicity, the more polynuclear complexes, the lower the charge density and the larger the molecular weight.
The combination of electric neutralization and adsorption bridging can remove the colloid pollutants in water, and adsorption neutralization and precipitation are both important means of coagulation. Therefore, the use effect of products should not be simply judged by the level of basicity. Dephosphorizers can remove turbidity, decolorization, deoiling, dehydration, bacteria, deodorization, algae removal, COD, BOD and heavy metal ions in water. Polyferric sulfate is a kind of inorganic polymer coagulant with superior performance. It is light yellow, amorphous powder solid, easily soluble in water. 10% (mass) of aqueous solution is reddish brown transparent solution with hygroscopicity.
The products of trivalent iron ions pre hydrolyzed form polynuclear complexes such as [Fe3 (H2O) 6 (OH) 3] 6 + through bridging between hydroxyl groups, and move towards the direction of Fe (OH) 3 at high basicity, which weakens the ability of product to adsorb and neutralize, but also enhances the bridging and trapping effects. Polyferric sulfate is widely used in the purification of drinking water, industrial water, various industrial wastewater, urban sewage, sludge dewatering and so on. The corresponding basicity = n / 6 × 100%. The higher the basicity of PFS, that is, the higher the n value, the higher the degree of polymerization M.
That's about it Total iron content and basicity of polyferric sulfate Hope to help you!