电石渣改性制备高效CO_(2)复合吸收剂  

High Efficiency CO_(2)Composite Absorbent Prepared by Modification of Carbide Slag

作　　者：张媛[1] 高彩云[1,2,3] 李东[4] 李梅[1] ZHANG Yuan;GAO Caiyun;LI Dong;LI Mei(School of Chemistry and Chemical Engineering,North Minzu University,Yinchuan 750021,China;Ningxia Key Laboratory of Solar Chemical Conversion Technology,North Minzu University,Yinchuan 750021,China;Key Laboratory of Chemical Engineering and Technology,State Ethnic Affairs Commission,North Minzu University,Yinchuan 750021,China;School of Materials Science and Engineering,North Minzu University,Yinchuan 750021,China)

机构地区：[1]北方民族大学化学与化学工程学院,银川750021 [2]北方民族大学宁夏太阳能化学转化技术重点实验室,银川750021 [3]北方民族大学国家民族事务委员会化学工程与技术重点实验室,银川750021 [4]北方民族大学材料科学与工程学院,银川750021

出　　处：《人工晶体学报》2024年第2期344-354,共11页Journal of Synthetic Crystals

基　　金：宁夏回族自治区自然科学基金(2022AAC03218,2023AAC03292)。

摘　　要：电石渣是典型的高钙工业固体废弃物,具有优异的CO_(2)吸收性能,但是在钙循环中纯电石渣的反应活性和CO_(2)吸收性能会随着循环次数的增加而降低。本文以电石渣为钙源,以MgO和ZnO为掺杂剂合成高效稳定的钙镁锌复合吸收剂,在固定床反应器中探究了合成工艺条件及掺杂量对复合吸收剂CO_(2)吸收性能的影响,以及循环吸收过程中吸收剂内部结构的变化。结果表明,利用干物理混合法合成的吸收剂比湿混合法具有更丰富的孔隙结构,Mg和Zn元素在电石渣表面分散均匀,有效改善了电石渣的抗烧结性能和反应活性,改性后的复合吸收剂在循环过程中具有更高的CO_(2)吸收性能,且20次循环后,干物理混合法合成的复合吸收剂CO_(2)吸收量仍可达0.42 g/g。Carbide slag is a typical high calcium industrial solid waste with excellent CO_(2)absorption performance,but the reaction activity and CO_(2)absorption performance of pure carbide slag in calcium cycling will decrease with the increase of cycling times.Efficient and stable calcium-magnesium zinc composite absorbents was synthesized using carbide slag as the calcium source,MgO and ZnO as dopants.Effects of synthesis process conditions and doping amount on the absorption performance of CO_(2)composite absorbent were investigated in a fixed bed reactor,as well as the changes in the internal structure of the absorbent during cyclic absorption.The results show that the absorbent synthesized by dry physical mixing method has a richer pore structure than wet mixing method.Mg and Zn elements are evenly dispersed on the surface of the carbide slag,effectively improving the anti-sintering performance and reaction activity of the carbide slag.The modified composite absorbent has higher CO_(2)absorption performance during the cycling process,and after 20 cycles,CO_(2)absorption capacity of the composite absorbent synthesized by dry physical mixing method can still reach 0.42 g/g.

关 键 词：固体废弃物 电石渣 CO_(2)吸收性能 干物理混合法 湿混合法 

分 类 号：TQ09[化学工程]