鉱物処理・環境・リサイクル

[3K62201-05-01] Acceleration of CO2 sequestration by bottom ash using grinding technology

○JOSIANE PONOU PONOU¹, Yudai Tanaka¹, Gjergj Dodbiba¹ (1. Department of Systems Innovation, Graduate school of Engineering, The University of Tokyo)

Keywords:Mineral carbonation, Bottom ash, Particle size, Acceleration, Carbon dioxide

Mineral carbonation technology is a process whereby CO₂ is chemically reacted with calcium and/or magnesium-containing minerals to form stable carbonate materials. Mineral carbonation is a potentially attractive sequestration technology for the permanent and safe storage of CO₂. Large amounts of calcium/magnesium oxide, calcium/magnesium silicate exist in various types of ashes which can be carbonated as stable material and environmentally harmless products.

In the present study, bottom ash provided from incinerated municipal wastes has been used to study the CO₂ capture and sequestration process of the material mechanically ground under various sizes. The main objective is to find out a suitable way and optimum condition for accelerating the carbonation rate using grinding technology. Therefore, the optimization of the mineral carbonation process was attempted by increasing the solid-liquid-gas contact time, testing various particle size fractions of the raw material. Particle size reduction was found to be an important parameter affecting the CO₂ sequestration rate.