Utilization of incineration fly ash from biomass power plants for zeolite synthesis from coal fly ash by hydrothermal treatment

作者：Fukasawa Tomonori; Horigome Akira; Tsu Takayuki; Karisma Achmad Dwitama; Maeda Norio; Huang An Ni; Fukui Kunihiro^*

来源：Fuel Processing Technology, 2017, 167: 92-98.

DOI：10.1016/j.fuproc.2017.06.023

• Biomass incineration ash
• Coal fly ash
• Zeolite
• Hydrothermal treatment
• Cesium adsorption capacity

In Japan, the quantity of incineration fly ash discharged from biomass power plants has increased rapidly due to the feed-in tariff established by the Japanese government. The costs of disposing of this biomass incineration ash are generally high; therefore, a method must be developed to utilize this by-product. In this context, we propose the syntheses of potassium-type zeolites (K-zeolites) from biomass incineration ash and coal fly ash via a hydro thermal route, which represents a novel use for this material. As the aqueous solution extracted from biomass incineration ash contains high concentrations of potassium, it was employed to substitute the KOH solution that is typically used in the synthesis of K-zeolites from coal fly ash. Consequently, we successfully synthesized a K-zeolite, containing phillipsite and chabazite phases, from coal fly ash using the extracted solution obtained from incineration fly ash. The NH4+ adsorption capacity of our synthesized K-zeolite was comparable to that of the K-zeolite synthesized using only KOH. We also confirmed that the prepared K-zeolite exhibited higher cesium adsorption selectivity than sodium-type zeolites, which are commonly produced industrially.