Sodium Aluminate Conditioning. - Interview Questions, Tutorials, Certification QuestionsWritten by V RSunday, 09 January 2011 18:37 -

Boiler water is treated with NaAlO2,it get hydrolyzed as NaAlO2 + 2H2O=NaOH + Al(OH)3 The sodium hydroxide formed precipitates the magnesium salts present in water as magnesiumhydroxide. 2NaOH + MgCl2=Mg(OH)2 + 2NaCl Both Al(OH)3 and Mg(OH)2 flocculant precipitate formed entraps all the scale forming materialsand colloidal impurities such as silica and oil.These loose precipitates can be removed byblow-down operation.NaAlO2 is a cheap by product obtained in bauxite refining.

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