CO2 sorption by dry sorbent prepared from CaO-SiO2 resources

被引：6

作者：

Park, Hyun Kyoo ^{[1
]}

Bae, Myung Won ^{[1
]}

Yoon, Ok Seon ^{[1
]}

Kim, Sun-Geon ^{[1
]}

机构：

[1] Chung Ang Univ, Sch Chem Engn & Mat Sci, Seoul 156756, South Korea

来源：

CHEMICAL ENGINEERING JOURNAL | 2012年 / 195卷

基金：

新加坡国家研究基金会;

关键词：

High-temperature CO2 sorbents; Steel slag; Waste cement; Tail-wollastonite: Leaching; Recrystallization: Calcium oxide; Silica; CALCIUM-BASED SORBENTS; CARBON-DIOXIDE; CAPTURE; OXIDE; CYCLE; GAS;

D O I：

10.1016/j.cej.2012.04.064

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

High-temperature CO2 sorbents were prepared by leaching and recrystallizing of calcium resources such as steel slag, tail-wollastonite, waste cement and fly ash. Alumina and small amount of silica in the sorbents were useful to maintain the CO2 sorption for more than 30 cycles. However, the silica, if included more than 10 mol% with respect to CaO, had negative effect on the sorption by more than its mole fraction. Thus, it was necessary to control Si dissolution for the resources composed of calcium silicate such as steel slag. The highest sorption of the sorbents from steel slag was 49% with 66% calcium utilization. On the other hand, if silica is in 'free' state, such as in waste cement, it hardly dissolves in the acid. Therefore, the sorbent could be prepared in core(SiO2)-shell(CaO) type by restructuring waste cement to show 100% utilization of the calcium in the shell. (c) 2012 Published by Elsevier B.V.

引用

页码：158 / 164

页数：7

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