PROCESSES FOR PRODUCTION OF IRON-SILICA COAGULANTS FOR WATER TREATMENT

摘要

The invention provides a process by which an iron-silica coagulant for water treatment excellent in coagulation performance can be produced with simple equipment more efficiently in a short time and a process by which an iron-silica coagulant for water treatment excellent in storage stability can be produced. A process for the production of an iron-silica coagulant for water treatment characterized by impingement-mixing either an aqueous solution containing a ferric salt or an aqueous solution containing both a ferric salt and a mineral acid with an aqueous solution of a silicate, wherein the production is conducted in such a way as to give a product having a pH of 0.3 to 1, an iron concentration of 30 to 120g/L, and an SiO2 concentration of 10 to 50g/L.