关键词: 铵基循环, CO₂, 碳酸化固定, 氨水, 电石渣

Abstract: Aqueous ammonia is one of reagents absorbing CO₂ and is of vast development potential.In this paper the reaction between decarbonization rich liquid and carbide slug is used for assisting CO₂ storage and recycle of aqueous ammonia at normal temperature and pressure.Using aqueous NH₄HCO₃ as rich liquid, pH and conductivity change during carbonation process were measured,and XRD, SEM and TGA employed for analysis of carbonation reaction products.Meanwhile, compared with aqueous ammonia having same concentration, carbonation reaction solution was also used to absorb CO₂.The results show that the carbonation reaction can be accomplished in short time, and the higher temperature and liquid-solid ratio are, the faster the reaction rate is.Besides, ultrasonics can make carbide slug particles smaller, and carbonation reaction solution can be recycled as its property is similar to aqueous ammonia of the same concentration.

Key words: ammonium-based recycle, CO₂, carbonation sequestration, aqueous ammonia, carbide slug