Effect of pCO2 on direct flue gas mineral carbonation at pilot scale

JOURNAL OF ENVIRONMENTAL MANAGEMENT

卷:198

Article

Mouedhen, Ikbel¹  Kemache, Nassima¹  Pasquier, Louis-Cesar¹  Cecchi, Emmanuelle¹  Blais, Jean-Francois¹  Mercier, Guy¹ 

[1] Inst Natl Rech Sci, Ctr Eau Terre & Environm, 490 Rue Couronne, Quebec City, PQ G1K 9A9, Canada

关键词: Mineral carbonation;    Serpentinite;    Industrial flue gas;    Open pit drainage water;    CO2 sequestration;    Pilot scale;   

DOI  :  10.1016/j.jenvman.2017.04.048

来源: Elsevier

【 摘 要 】

Concerns about global warming phenomena induced the development of research about the control of anthropogenic greenhouse gases emissions. The current work studies on the scaling up of aqueous mineral carbonation route to reduce the CO2 emissions at the chimney of industrial emitters. The reactivity of serpentinite in a stirred tank reactor was studied for several partial pressures of CO2 (pCO(2)) (0.4, 0.7, 1.3 and 1.6 bar). Prior to carbonation, the feedstock was finely grinded and dehydroxyled at 650 degrees C by a thermal treatment. The major content of magnetite was removed (7.5 wt% center dot total weight(-1)). Experiments were carried out under batch mode at room temperature using real cement plant flue gas (14-18 vol% CO2) and open pit drainage water. The effect of the raw water and the pCO(2) on the carbonation efficiency was measured. First, the main results showed a positive effect of the quarry water as a slight enhancement of the Mg leaching in comparison with distilled water. Secondly, a pCO(2) of 1.3 bar was the optimal working pressure which provided the highest efficiency of the carbonation reaction (0.8 gCO(2) center dot g residue(-1)). Precipitation rates of dissolved CO2 ranged from 7% to 33%. Pure precipitate was obtained and essentially composed of Nesquehonite. At a pCO(2) of 1.3 bar, additional physical retreatment of the solid material after being contacted with 6 batches of gas enhanced considerably mineral carbonation efficiency (0.17 gCO(2) center dot g residue(-1).). (C) 2017 Elsevier Ltd. All rights reserved.

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