2018 Volume 55 Issue 4 Pages 194-200
Friedel’s salt is typical insoluble chloride in municipal waste incinerator ash. In the eco-cement that made using by that ash for parts of raw materials, when remain chlorides induces the salt damage on its concrete materials, so its problems might disturbs its utilization in market. In order to remove insoluble salt in ash, we used the carbonation and milling techniques to laboratory synthesized Friedel’s salt and it recognized good results as, contacting with 0.1 mol/l sodium bicarbonate solution and milling method made it high chloride solubility into water. However in some case, it observed recrystallization of Friedel’s salt from solutions and might be chloride ion re-catching onto the amorphous salt surfaces. It means the importance of process control. Moreover, it understands the possibilities of detection of H+ movements during carbonation reaction using by at the pulse NMR method in this experiments. In these results, problems about to construct the dechloride processing became clear.
