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.

The choking prevention effect on dense-phase pneumatic conveying has been investigated experimentally while moisture and particle diameter are changed. Consequently, the adhesion force between particles and pipe wall has been increased drastically with increasing of moisture content. However, it has been reduced with ultrasonic in spite of experimental condition. This means the possibility of choking can be removed with ultrasonic vibration. Additionally particle motion on the ultrasonic vibration plate was analyzed. This result showed that particle velocity increases along with particle diameter and moisture content influences on only large-sized particle. This cause was considered that heavy particle which includes a lot of water cannot jump in long distance and water makes the meniscus between particle and wall.