High-concentration iron-based flocculant and its manufacturing method

摘要

PROBLEM TO BE SOLVED: To continuously produce an ultra-high concentration ferric sulfate solution which cannot be produced due to a long reaction time by a conventional production method. SOLUTION: Ferric sulfate, sulfuric acid and oxygen gas are used as raw materials, and a raw material solution containing ferric sulfate and sulfuric acid and oxygen gas satisfying the following relationship are continuously supplied into a high-temperature and high-pressure reaction vessel. Take out the ferric polysulfate solution. The molar ratio of total iron to sulfate (SO42- / T-Fe) is 1.2 or more. When the weight concentration of sulfate is [SO42-], [SO42-] is 35% by weight or less. 2