HIGH-CONCENTRATION IRON-BASED FLOCCULANT, AND METHOD FOR PRODUCING SAME

摘要

An ultra-high concentration polysulfate ferric solution, which cannot be produced using conventional production methods due to long reaction times, can be continuously produced.　Ferrous sulfate, sulfuric acid, and oxygen gas are used as starting materials; the oxygen gas and a starting solution containing the ferrous sulfate and sulfuric acid in accordance with the following relationship are fed to a reaction vessel residing at high temperature and high pressure; and a polysulfate ferric solution is continuously withdrawn.　A molar ratio (SO₄^2-/T-Fe) of sulfate ion to total iron of at least 1.2When the sulfate ion weight concentration is designated as [SO₄^2-], [SO₄^2-] is not more than 35 wt%