关键词: 粉煤灰, 电石渣, 吸附, 循环性能

Abstract: The amorphous aluminum hydroxide in fly ash was extracted by calcination of a mixture of fly ash, NaCO3, and CaCO3, and then doped into calcium carbide slag to prepare an aluminum-containing calcium-based composite adsorbent. Four samples with different doping ratios were prepared for the modified adsorbent, and adsorption performance and cycle stability experiments were conducted at different adsorption temperatures.The results showed that in the rapid reaction stage, the adsorption reaction rate of CA91 and CA73 was the fastest;After the adsorption reaction is complete, the adsorption capacity of the four doping ratios is: CA73＞CA91＞CA82＞CA64.In terms of cyclic performance, after 13 cycles of pure calcium carbide slag, the stability decreased significantly, and the adsorption capacity decreased by 15 wt.%;After 20 cycles, the adsorption capacity of CA73 only decreased by 5 wt.%,CA73 is the best adsorbent.The constant temperature adsorption-desorption experiment was conducted on CA73 to determine the optimal adsorption temperature of 750℃.This research not only achieves the in-situ consumption and resource utilization of carbide slag and fly ash, but also provides a low-cost adsorbent for CO2 emission reduction.

Key words: Fly ash, Carbide slag, adsorption, cycling performance