Prevention methods and scale inhibitor of silica-based scale in the water system, as well as inhibit water treatment methods and water treatment agent the corrosion of the metal as well as suppress the silica-based scale

摘要

PROBLEM TO BE SOLVED: To provide a method for preventing silica scale and a scale inhibitor exhibiting enough scale preventing effects even in the coexistence of an aluminum ion, an iron ion, a zinc ion and the like in a water system such as a cooling water system, a boiler water system and a geothermal power generation water system, and to provide a water treatment method and water treatment agent for preventing silica scale as well as corrosion of metals.;SOLUTION: A method for preventing silica scale in a water system includes adding one or more kind selected from polyethylene glycol having a molecular weight of 200 to 800, polyethylene glycol monomethyl ether into a water system containing a total concentration of 0.5 mg/L or more of metals selected from aluminium, iron and zinc.;COPYRIGHT: (C)2014,JPO&INPIT