Steel slag carbonation in a flow-through reactor system:The role of fluid-flux

作     者：Eleanor J.Berryman Anthony E.Williams-Jones Artashes A.Migdisov 

作者机构：Department of Earth and Planetary Sciences McGill University Technische Universitat Berlin Los Alamos National Laboratory 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2015年第27卷第1期

页      面：266-275页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 

基　　金：financial support of Tata Steel and NSERC to AEW-J(NSERC-CRD grant number CRDPJ 385478-09) 

主　　题：CO2sequestration Steel slag carbonation Flow-through reactor Fluid flux 

摘      要：Steel production is currently the largest industrial source of atmospheric CO2. As annual steel production continues to grow, the need for effective methods of reducing its carbon footprint increases correspondingly. The carbonation of the calcium-bearing phases in steel slag generated during basic oxygen furnace（BOF） steel production, in particular its major constituent, larnite {Ca2SiO4}, which is a structural analogue of olivine {（MgFe）2SiO4}, the main mineral subjected to natural carbonation in peridotites, offers the potential to offset some of these emissions. However, the controls on the nature and efficiency of steel slag carbonation are yet to be completely understood. Experiments were conducted exposing steel slag grains to a CO2–H2O mixture in both batch and flow-through reactors to investigate the impact of temperature, fluid flux, and reaction gradient on the dissolution and carbonation of steel slag. The results of these experiments show that dissolution and carbonation of BOF steel slag are more efficient in a flow-through reactor than in the batch reactors used in most previous studies. Moreover, they show that fluid flux needs to be optimized in addition to grain size, pressure, and temperature, in order to maximize the efficiency of carbonation. Based on these results, a two-stage reactor consisting of a high and a low fluid-flux chamber is proposed for CO2 sequestration by steel slag carbonation,allowing dissolution of the slag and precipitation of calcium carbonate to occur within a single flow-through system.