Sequestering CO2 by Mineralization into Useful Nesquehonite-Based Products
Sequestering CO2 by Mineralization into Useful Nesquehonite-Based Products
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DOI：
10.3389/fenrg.2016.00003
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发表时间：
2016-02
影响因子：
3.4
通讯作者：
F. Glasser;Guillaume Jauffret;J. Morrison;José-Luis Gálvez-Martos;N. Patterson;M. Imbabi
中科院分区：
文献类型：
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作者：
F. Glasser;Guillaume Jauffret;J. Morrison;José-Luis Gálvez-Martos;N. Patterson;M. Imbabi
已经提出将碱式碳酸镁水合物的沉淀作为将CO2隔离到固体中的途径。我们报道了基于水菱镁矿MgCO3·3H2O的自胶结组合物的开发，其由含CO2的气流制成，CO2通过其在碱性水中的高溶解度与其它气体分离，而镁通常由废脱盐盐水提供。调整沉淀条件以优化水羟镁石的形成，并且结晶固体可以很容易地被洗涤掉氯化物。产品可以通过以下两种途径制备以实现自胶结：（i）热活化水碳镁石，然后再水化前体或（ii）直接固化水碳镁石浆料。由此获得的产品含有约30重量%的二氧化碳，可以形成新一代轻质隔热板、砌块和面板的基础，具有足够的强度用于一般建筑。
The precipitation of magnesium hydroxy-carbonate hydrates has been suggested as a route to sequester CO2 into solids. We report the development of self-cementing compositions based on nesquehonite, MgCO3·3H2O, that are made from CO2-containing gas streams, the CO2 being separated from other gases by its high solubility in alkaline water, while magnesium is typically provided by waste desalination brines. Precipitation conditions are adjusted to optimize the formation of nesquehonite and the crystalline solid can readily be washed free of chloride. Products can be prepared to achieve self-cementation following two routes: (i) thermal activation of the nesquehonite then rehydration of the precursor or (ii) direct curing of a slurry of nesquehonite. The products thus obtained contain ~ 30 wt% CO2 and could form the basis for a new generation of lightweight, thermally insulating boards, blocks and panels, with sufficient strength for general construction.