Red mud-molten salt composites for medium-high temperature thermal energy storage and waste heat recovery applications.
Red mud-molten salt composites for medium-high temperature thermal energy storage and waste heat recovery applications.
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DOI：
10.1016/j.jhazmat.2021.125407
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发表时间：
2021-07
影响因子：
13.6
通讯作者：
A. Anagnostopoulos;M. Navarro;M. Stefanidou;Yulong Ding;G. Gaidajis
中科院分区：
文献类型：
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作者：
A. Anagnostopoulos;M. Navarro;M. Stefanidou;Yulong Ding;G. Gaidajis
红泥（RM）是铝工业的工业废物，目前估计全世界遗留地库存为40亿吨。RM通常被处置在海洋、水坝或堤坝中，由于其高碱度和痕量的重金属，对环境造成重大危害。尽管最近作出了稳定物价的努力，但目前只有15%的RM存款得到利用。在这项工作中，一个新的使用RM制定复合相变材料（CPCMs）的建议。CPCM通过将硝酸盐与RM研磨、压缩并随后烧结两者来配制。在25-400 ℃的温度范围内观察到总体良好的性能。CPCM的最大潜热为58 J/g，平均热导率和平均导热系数分别为0.77-0.83 W/mK和1.03-1.31 J/g ℃。在48次循环后没有观察到熔点或潜热的变化。能量存储密度计算为高达1396 MJ/m3。这种新型CPCM的工作温度使其成为中高温废热流的废热回收的理想选择，为RM作为能源相关应用的副产品提供了一种增值途径和增值。
Red mud (RM) is an industrial waste of the aluminum industry with presently estimated worldwide legacy-site stockpiles of 4 billion tones. RM is typically disposed in the sea, dams or dykes, posing a significant environmental hazard due to its high alkalinity and traces of heavy metals. Despite recent valorization efforts, only 15% of RM deposits are currently utilized. In this work, a novel use of RM to formulate composite phase change materials (CPCMs) is proposed. The CPCM is formulated by milling nitrate salts with RM, compressing and subsequent sintering of the two. Overall good performance over the temperature range of 25–400 ℃ is observed. Maximum latent heat of the CPCMs is 58 J/g, while average thermal conductivity andCpare in the range of 0.77–0.83 W/mK and 1.03–1.31 J/g ℃, respectively. No variations in the melting point or latent heat are observed after 48 cycles. Energy storage density is calculated to be up to 1396 MJ/m3. The working temperature of this novel CPCM make it ideal for waste heat recovery of medium-high temperature waste heat streams providing a valorization pathway and valorization for RM as a by-product for energy-related applications.