Enhanced properties of stone coal-based composite phase change materials for thermal energy storage

IF 5.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY International Journal of Minerals, Metallurgy, and Materials Pub Date : 2024-01-01 DOI:10.1007/s12613-023-2682-x

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Abstract

Phase change materials (PCMs) can be incorporated with low-cost minerals to synthesize composites for thermal energy storage in building applications. Stone coal (SC) after vanadium extraction treatment shows potential for secondary utilization in composite preparation. We prepared SC-based composite PCMs with SC as a matrix, stearic acid (SA) as a PCM, and expanded graphite (EG) as an additive. The combined roasting and acid leaching treatment of raw SC was conducted to understand the effect of vanadium extraction on promoting loading capacity. Results showed that the combined treatment of roasting at 900°C and leaching increased the SC loading of the composite by 6.2% by improving the specific surface area. The loading capacity and thermal conductivity of the composite obviously increased by 127% and 48.19%, respectively, due to the contribution of 3wt% EG. These data were supported by the high load of 66.69% and thermal conductivity of 0.59 W·m⁻¹·K⁻¹ of the designed composite. The obtained composite exhibited a phase change temperature of 52.17°C, melting latent heat of 121.5 J·g⁻¹, and good chemical compatibility. The SC-based composite has prospects in building applications exploiting the secondary utilization of minerals.

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用于热能储存的石煤基复合相变材料的性能提升

摘要相变材料（PCMs）可与低成本矿物结合，合成建筑应用中的热能储存复合材料。经过提钒处理的石煤（SC）具有在复合材料制备中二次利用的潜力。我们以石煤为基体，硬脂酸（SA）为 PCM，膨胀石墨（EG）为添加剂，制备了基于石煤的复合 PCM。为了了解钒萃取对促进负载能力的影响，我们对未加工的 SC 进行了焙烧和酸浸出联合处理。结果表明，900°C 的焙烧和浸出联合处理提高了比表面积，从而使复合材料的 SC 负载增加了 6.2%。由于 3wt% EG 的贡献，复合材料的负载能力和热导率分别明显提高了 127% 和 48.19%。所设计复合材料的高负载率（66.69%）和高导热率（0.59 W-m-1-K-1）证实了这些数据。所得复合材料的相变温度为 52.17°C，熔化潜热为 121.5 J-g-1，并具有良好的化学相容性。这种基于 SC 的复合材料在利用矿物的二次利用方面具有建筑应用前景。

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来源期刊

International Journal of Minerals, Metallurgy, and Materials 工程技术-材料科学：综合

CiteScore

9.30

自引率

16.70%

发文量

205

审稿时长

2 months

期刊介绍： International Journal of Minerals, Metallurgy and Materials (Formerly known as Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material) provides an international medium for the publication of theoretical and experimental studies related to the fields of Minerals, Metallurgy and Materials. Papers dealing with minerals processing, mining, mine safety, environmental pollution and protection of mines, process metallurgy, metallurgical physical chemistry, structure and physical properties of materials, corrosion and resistance of materials, are viewed as suitable for publication.