sodium aluminate conditioning
Post on 14-Oct-2015
197 Views
Preview:
DESCRIPTION
Sodium Aluminate Conditioning
TRANSCRIPT
-
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.
1 / 1
top related