| abstract |
[PROBLEMS] To effectively suppress magnesium-based scales such as magnesium silicate in a boiler water system of soft water feed water that could not achieve a sufficient and certain effect with conventional scale inhibitors, and to operate the boiler safely and efficiently. A magnesium-based scale inhibitor is provided. A magnesium-based scale inhibitor containing a dispersant and a chelating agent in a magnesium-based scale inhibitor used in a boiler water system for soft water supply. As the dispersant, one or two selected from the group consisting of polyacrylic acid and / or a salt thereof, and a copolymer of acrylic acid and 2-acrylamido-2-methylpropanesulfonic acid and / or a salt thereof. The above is preferable, and as the chelating agent, ethylenediaminetetraacetic acid and / or a salt thereof is preferable. [Selection] Figure 1 |