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- W2486521622 abstract "This chapter describes the process of feed water treatment. All natural waters are unsatisfactory for use in boilers because of the impurities present. All waters may be rendered suitable for use by treatment with chemical reagents, supplemented by evaporation and ion exchange where the highest degree of purity is required. Deep well and surface drainage waters are usually hard; moorland waters are usually soft. Hard waters contain salts that form insoluble precipitates with soap and form scale in boilers. The salts responsible for hardness are usually the bicarbonates and sulfates of calcium and magnesium. Scale is produced when temporary or permanent hardness is precipitated by contact with hot surfaces at temperatures greater than about 60°C. It is prevented by softening the feed water, that is, by removing scale forming components. In lime-soda process, hydrated lime is used to precipitate temporary hardness because of calcium and magnesium bicarbonate, and permanent hardness because of magnesium salts. Sodium carbonate is used to precipitate permanent hardness because of calcium salts." @default.
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- W2486521622 date "1980-01-01" @default.
- W2486521622 modified "2023-09-26" @default.
- W2486521622 title "Boiler Waters—Feed Water Treatment" @default.
- W2486521622 doi "https://doi.org/10.1016/b978-0-08-025249-0.50097-5" @default.
- W2486521622 hasPublicationYear "1980" @default.
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