Mineral carbonation from metal wastes: Effect of solid to liquid ratio on the efficiency and characterization of carbonated products
Mineral carbonation from metal wastes: Effect of solid to liquid ratio on the efficiency and characterization of carbonated products
复制标题
DOI：
10.1016/j.apenergy.2013.07.064
复制
发表时间：
2014
期刊：
影响因子：
11.2
通讯作者：
M. Dri;A. Sanna;M. Maroto-Valer
中科院分区：
文献类型：
--
作者：
M. Dri;A. Sanna;M. Maroto-Valer
矿物碳化技术旨在将二氧化碳永久储存在富含金属氧化物的材料中。研究了一种利用富钙废液沉淀碳酸钙的多步成矿工艺。以磨细的高炉渣(GGBS)、磷渣(PS)和钢渣(SS)为原料进行了该工艺的研究。固液比(S/L)是影响矿物碳化的重要因素，本研究考察了固液比对矿物碳化效率的影响。利用X射线荧光、X射线衍射仪和扫描电子能谱仪对碳化残渣中的主要物相进行了鉴定。对于所考察的三种材料，由于稀释效应，随着S/L比例的降低(从50微克/L减小到25微克/L，然后再降至15微克/L)，碳化效率提高。在以前的一项研究中，使用蛇纹石的效率低于这里计算的GGBS和SS的效率，略高于PS。这证实了，一般来说，与矿物岩相比，废物需要较少的能量密集型碳化条件。最后，对碳化颗粒的结构进行了讨论。
Mineral carbonation technologies aim at permanently storing CO2into materials rich in metal oxides. A multi-step mineralization process employing Ca-rich waste streams to precipitate calcium carbonate is investigated in this paper. Ground granulated blast furnace slag (GGBS), phosphorus slag (PS) and steel slag (SS) were employed as feeding materials for the process. Solid to liquid ratio (S/L) is an important factor which affects mineral carbonation and this study examines its effect on the carbonation efficiencies. The main phases present in the carbonated residues were identified using XRF, XRD and SEM–EDS analytical techniques. For the three materials investigated, the carbonation efficiency increased when the S/L ratio decreased (from 50 g/L to 25 g/L and then 15 g/L) because of the dilution effect. In a previous study, where an analog process was employed, efficiency using serpentine was found lower than that calculated here for GGBS and SS, and slightly above PS. This confirms that, in general, waste materials require less energy-intensive carbonation conditions, in comparison to mineral rocks. Finally, the structure of the carbonated particles is also discussed.