IRON-BASED FLOCCULANT AND METHOD FOR IRON-BASED FLOCCULANT

摘要

The present invention relates to an iron-based coagulant and a method for producing an iron-based coagulant, the iron concentration is 50 ~ 200g / L, the molar ratio value of the total sulfate (T-SO ₄ ) and the total iron (T-Fe) (T-SO ₄ / T-Fe) is 0.5 T-SO ₄ / T-Fe 1, the _formula is [Fe ₂ (OH) _n (SO ₄ ) _{3-n / 2} ] _m , the basicity n is 0 n 6, The degree of polymerization, m, is 100 or more, and the oxidizing agent uses hydrogen peroxide (H ₂ O ₂ ) of 0.5pH or less, but sulfuric acid (H ₂ SO ₄ ) for dissolving iron (Fe) and liquid hydrogen peroxide (H ₂ O ₂₎ ) the committed at the same time subjected to a dissolution and oxidation of iron at the same time, it consists of a solution of sulfuric acid ions (SO ₄₎ both the reducing iron (Fe), and OH groups the basic ferric sulfate in the amount of the large amount of iron By dissolving sulfuric acid and liquid hydrogen peroxide, which is an oxidizing agent, to dissolve and oxidize at the same time, it is possible to suppress the reduction of hydrogen ions and iron generated during the oxidation reaction in which iron is dissolved in sulfuric acid. Coagulation efficiency can be improved by forming a large amount of one OH group to increase the cohesiveness and increase the degree of polymerization to increase the size of flocs.Sulfate ions can be added simultaneously with sulfuric acid and hydrogen peroxide during iron dissolution and oxidation. The amount of iron can be added while reducing the amount of (SO ₄ ), so that basic ferric sulfate can be prepared in a state where the iron concentration is supersaturated, thereby improving the cohesive efficiency, and using hydrogen peroxide as the oxidizing agent. It provides an iron-based coagulant and iron-based coagulant manufacturing method that can improve the cohesive force by reducing the amount of nitrogen to 100ppm or less in the second iron sulfate.