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Enhancing the rate of ex situ mineral carbonation in dunites via ball milling

机译:通过球磨提高dunits中异位矿物碳酸化的速率

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The investigation of potential options for CO2 sequestration is of vital importance for alleviating the ongoing climate problem. This paper presents an efficient method for enhancing the ex situ carbonation of dunites. The ball milling process was applied to a dunite from the Troodos ophiolite (Cyprus), in order to create a new type of material with enhanced CO2 uptake. Through CO2 chemisorption followed by temperature-programmed desorption (CO2-TPD) experiments, optimum ball milling conditions were found (12 h of wet ball milling with 50 wt% ethanol as process control agent), leading to an increase of CO2 uptake of dunite by a factor of 6.9. A further increase of CO2 uptake by 10% was accomplished after 4 h of additional ball milling with smaller balls. Additionally, CO2-TPD along with in situ DRIFTS studies indicated that the CO2 uptake of the dunitic materials can be substantially enhanced by the presence of H2O during CO2 chemisorption. The positive effect of H2O on CO2 chemisorption becomes much more evident after the ball milling process. Specifically, the CO2 uptake of the ball-milled sample (BM45) was enhanced by a factor of 5.8 (from 181.9 to 1047.5 mu mol g(-1)), when CO2 chemisorption was performed in the presence of 20 vol% H2O. (C) 2016 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.
机译:对潜在的二氧化碳封存方案的研究对于缓解当前的气候问题至关重要。本文提出了一种有效的方法来增强杜尼的异位碳酸化。球磨工艺被应用于Troodos蛇绿岩(塞浦路斯)的榴n石,目的是创造一种新型的具有增加的CO2吸收率的材料。通过对CO2的化学吸附,然后进行程序升温脱附(CO2-TPD)实验,发现了最佳的球磨条件(使用50 wt%的乙醇作为工艺控制剂的湿法球磨12 h),通过以下方法增加了对辉石的CO2吸收量:系数为6.9。在使用较小的球进行额外的球磨4小时后,二氧化碳吸收量进一步增加了10%。此外,CO2-TPD以及原位DRIFTS研究表明,在CO2化学吸附过程中,H2O的存在可以大大提高二元材料的CO2吸收率。在球磨过程之后,H2O对CO2化学吸附的积极作用变得更加明显。具体而言,当在20%(体积)的H2O存在下进行CO2化学吸附时,球磨样品(BM45)的CO2吸收增加了5.8倍(从181.9到1047.5μmolg(-1))。 (C)2016日本粉末技术学会。由Elsevier B.V.和日本粉末技术学会出版。版权所有。

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