Extraction of active components from fly ash and preparation of a carbon adsorbent doped with carbide slag： Performance evaluation

doi:10.3969/j.issn.2097-0706.2026.03.008

Abstract

Abstract:

Industrial calcium carbide slag has advantages such as low cost and good CO₂ adsorption performance. However， it tends to sinter after multiple cycles at high temperatures， directly resulting in low CO₂ adsorption capacity. Enhancing the activity and specific surface area of calcium carbide slag to improve its CO₂ adsorption-desorption performance has become an urgent challenge. Amorphous aluminum hydroxide was extracted from fly ash by mixed calcination of fly ash， Na₂CO₃， and CaCO₃， and then incorporated into carbide slag to prepare aluminum-calcium-based composite adsorbents. Four samples with different doping ratios of the modified adsorbents were prepared and tested for adsorption performance and cyclic stability under various adsorption temperatures. The results showed that during the rapid reaction phase， the CA91（$ m_{\mathrm{Ca}(\mathrm{OH})_{2}}: m_{\mathrm{AlO}(\mathrm{OH})}$=9∶1） and CA73（$ m_{\mathrm{Ca}(\mathrm{OH})_{2}}: m_{\mathrm{AlO}(\mathrm{OH})}$=7∶3） samples exhibited the fastest adsorption reaction rates. After the adsorption reaction was completed， the adsorption capacities of four doping ratios followed the order： CA73 > CA91 > CA82（$ m_{\mathrm{Ca}(\mathrm{OH})_{2}}: m_{\mathrm{AlO}(\mathrm{OH})}$=8∶2） > CA64（$ m_{\mathrm{Ca}(\mathrm{OH})_{2}}: m_{\mathrm{AlO}(\mathrm{OH})}$=6∶4）. In terms of cyclic performance， pure carbide slag showed a significant decrease in stability after 13 cycles， with its adsorption capacity reduced by 15%. In contrast， CA73 exhibited only a 5% decrease in adsorption capacity after 20 cycles， making it the optimal adsorbent. Further adsorption-desorption experiments on CA73 at constant and varying temperatures identified the optimal adsorption temperature as 750 ℃. The local disposal and resource utilization of carbide slag and fly ash are achieved，and a cost-effective adsorbent for CO₂ emission reduction is also provided.

Key words: fly ash, carbide slag, adsorption, stability, cyclic performance, doping ratio

CLC Number:

TK 01

WU Jie, ZHANG Chao, LIANG Xiaolong. Extraction of active components from fly ash and preparation of a carbon adsorbent doped with carbide slag： Performance evaluation[J]. Integrated Intelligent Energy, 2026, 48(3): 76-84.

Figures/Tables 13

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名称	主要成分	电石渣与偏氢氧化铝质量比	试验条件
CA91	Ca(OH)₂，AlO(OH)	9∶1	烘干后的电石渣和提铝后的粉煤灰按照质量比9∶1机械混合，在马弗炉中以25 ℃/min的升温速率升至800 ℃，煅烧2 h；在CO₂气氛下以20 ℃/min的升温速率由室温升至1 000 ℃
CA82	Ca(OH)₂，AlO(OH)	8∶2	烘干后的电石渣和提铝后的粉煤灰按照质量比8∶2机械混合，在马弗炉中以25 ℃/min的升温速率升至800 ℃，煅烧2 h；在CO₂气氛下以20 ℃/min的升温速率由室温升至1 000 ℃
CA73	Ca(OH)₂，AlO(OH)	7∶3	烘干后的电石渣和提铝后的粉煤灰按照质量比7∶3机械混合，在马弗炉中以25 ℃/min的升温速率升至800 ℃，煅烧2 h；在CO₂气氛下以20 ℃/min的升温速率由室温升至1 000 ℃
CA64	Ca(OH)₂，AlO(OH)	6∶4	烘干后的电石渣和提铝后的粉煤灰按照质量比6∶4机械混合，在马弗炉中以25 ℃/min的升温速率升至800 ℃，煅烧2 h；在CO₂气氛下以20 ℃/min的升温速率由室温升至1 000 ℃

吸附剂	比表面积/（m²·g^-1）	孔容/（cm³·g^-1）	平均孔直径/nm
CA91	6.50	28.17×10^-3	17.321 7
CA91-20	2.88	14.51×10^-3	20.345 9
CA82	6.60	29.74×10^-3	18.002 8
CA82-20	3.10	11.03×10^-3	14.455 3
CA73	9.45	43.93×10^-3	18.586 2
CA73-20	3.87	13.11×10^-3	13.706 0
CA64	6.15	17.69×10^-3	11.501 4
CA64-20	2.12	4.71×10^-3	8.316 3