Abstract Mineral carbonation of serpentine in the aqueous phase traditionally required high temperatures and pressures or additives to dissolve the mineral. This was accompanied by significant costs and important environmental burdens. This paper aims to demonstrate the feasibility of thermally activated serpentine leaching under ambient temperature and pressure. A simulated cement flue gas effluent with a CO2 content of 18.2% on a volume basis was used. The reaction was performed in a bubble column operated under a homogeneous regime. Agitation was required to improve solution mixing and CO2 diffusion. Results showed that the extent of Mg leaching was limited by the low solubility of silica in the aqueous solution. Once the solution was saturated with silica, CO2 dissolution acted only to cause precipitation of magnesium carbonate. Successive leaching with fresh water partially limited the problem as serpentine leaching declined with time. A total of 32% of the serpentine magnesium content was recovered from the solution after six successive leaching stages. For comparison, 33% of the content of the same material was dissolved when the reaction was performed in a batch reactor operated under 11.5 bar total pressure. In addition to costs and environmental improvements, these results have positive consequences on reducing complexity and retrofit issues for the application of mineral carbonation with serpentine. It was also shown that improving CO2 mass transfer through increasing agitation or superficial gas velocity accelerated serpentine leaching, highlighting the synergistic effect between the two reactions.

中文翻译：

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在环境压力和温度下运行的鼓泡塔反应器中烟气条件下的热活化蛇纹石浸出

摘要 蛇纹石在水相中的矿物碳酸化传统上需要高温和高压或添加剂来溶解矿物。这伴随着巨大的成本和重要的环境负担。本文旨在论证在常温常压下热活化蛇纹石浸出的可行性。使用了一种模拟水泥烟气流出物，其 CO2 含量为 18.2%（按体积计）。反应在均相方案下操作的泡罩塔中进行。需要搅拌以改善溶液混合和 CO2 扩散。结果表明，Mg 浸出的程度受到二氧化硅在水溶液中的低溶解度的限制。一旦溶液被二氧化硅饱和，CO 2 溶解作用仅引起碳酸镁沉淀。由于蛇纹石浸出随着时间的推移而下降，因此用淡水连续浸出部分地限制了该问题。经过六个连续的浸出阶段后，从溶液中回收了总共 32% 的蛇纹石镁含量。为了比较，当反应在总压为 11.5 巴的间歇式反应器中进行时，相同材料的 33% 含量被溶解。除了成本和环境改善之外，这些结果对于降低蛇纹石矿物碳酸化应用的复杂性和改造问题具有积极的影响。还表明，通过增加搅拌或表观气体速度来改善 CO2 传质会加速蛇纹石浸出，突出了两种反应之间的协同作用。