PURPOSE: To obtain hydrogen from incineration ash by a simple method and also to recover an available substance therefrom and to make incineration ash harmless by adding incineration ash to alkali liquid, recovering generated hydrogen, dehydrating and drying the residue of incineration ash and thereafter solidifying and melting this residue.
CONSTITUTION: Incineration ash 1 is added to an alkali soln. such as NaOH and KOH in a hydrogen generator 2. After generated hydrogen is dried by a moisture adsorbing device 3, it is purified to hydrogen of ≥99% by a separating and purifying device 1, which is constituted of a high-purity hydrogen separating membrane. Thereafter, this hydrogen is stored in a storage device 5. On the other hand, after ash is sufficiently retained in a device 2, it is led to a dehydrating dryer 6 and dried via mechanical dehydrating operation of filtration and compression. Further, filtrate is returned to the device 2 in accordance with necessity. Residue contg. moisture of several percentage is changed into vitriform slag by a melting furnace 7. This vitriform slag is cooled and solidified to form a lump shape and made harmless. As a result, hydrogen is obtained from incineration ash by a simple method and also the residue is easily melted and solidified. Heavy metal is changed into hydroxide and volatilization thereof is prevented.
MIZUSHIMA TOYOJI
IZAWA KATSUMASA
KATAKI MASAHIRO
