Direct and efficient in situ rubidium extraction from potassium chloride salts

IF 25.7 1区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Nature Sustainability Pub Date : 2024-11-01 DOI:10.1038/s41893-024-01449-w
Xulong Chen, Wenping Hu
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Abstract

Rubidium (Rb) is a valuable rare alkali metal that plays a crucial role in various high-tech applications, but extracting Rb from conventional sources poses sustainability challenges. A considerable amount of Rb is found in potassium chloride (KCl) salts, which can serve as a sustainable source depending on the extraction methods. Current liquid-phase methods are problematic due to the low Rb/K separation factor and high consumption of energy, water and chemicals. Extracting Rb directly from solid KCl salts is a promising approach, but achieving efficient recovery remains a challenge. Here we propose a crystal ripening microextraction strategy that enables in situ extraction of Rb from solid KCl salts with high selectivity, simplicity and high efficiency. By applying this strategy, we recovered 92.37% of Rb from KCl salts with an initial Rb content of 113 ppm. Compared with liquid-phase extraction, our approach results in a 97.57% reduction in energy consumption, a 22.24% increase in recovery efficiency and a 13.46-fold higher Rb/K separation factor, which substantially enhance environmental and economic benefits. In addition, this approach is suitable for recovering other target metals needed for various industrial applications directly from different solid metallic salts, providing a pathway to improve the sustainability of critical metal supply. Sustainably extracting rubidium (Rb), a valuable critical metal, from alternative sources remains challenging. Here the authors report a crystal ripening microextraction strategy that allows efficient Rb extraction from potassium chloride salts, with large environmental and economic benefits.

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Publisher Correction: Direct and efficient in situ rubidium extraction from potassium chloride salts
IF 25.7 1区 环境科学与生态学Nature SustainabilityPub Date : 2024-11-10 DOI: 10.1038/s41893-024-01486-5
Xulong Chen, Wenping Hu
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Nature Sustainability
Nature Sustainability Energy-Renewable Energy, Sustainability and the Environment
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41.90
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1.10%
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159
期刊介绍: Nature Sustainability aims to facilitate cross-disciplinary dialogues and bring together research fields that contribute to understanding how we organize our lives in a finite world and the impacts of our actions. Nature Sustainability will not only publish fundamental research but also significant investigations into policies and solutions for ensuring human well-being now and in the future.Its ultimate goal is to address the greatest challenges of our time.
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