Red mud-molten salt composites for medium-high temperature thermal energy storage and waste heat recovery applications

被引：88

作者：

Anagnostopoulos, Argyrios ^{[1
,2
,5
]}

Navarro, Maria Elena ^{[1
,2
]}

Stefanidou, Maria ^{[3
]}

Ding, Yulong ^{[1
,2
]}

Gaidajis, Georgios ^{[4
]}

机构：

[1] Univ Birmingham, Birmingham Ctr Energy Storage, Birmingham B15 2TT, W Midlands, England

[2] Univ Birmingham, Sch Chem Engn, Birmingham B15 2TT, W Midlands, England

[3] Aristotle Univ Thessaloniki, Lab Bldg Mat, Sch Civil Engn, GR-54124 Thessaloniki, Greece

[4] Democritus Univ Thrace, Lab Environm Management & Ind Ecol, Dept Prod & Management, Engn, GR-67100 Xanthi, Greece

[5] Univ Silesia, Inst Chem, Szkolna 9, PL-40006 Katowice, Poland

来源：

JOURNAL OF HAZARDOUS MATERIALS | 2021年 / 413卷

基金：

英国工程与自然科学研究理事会;

关键词：

Red mud; Molten salt; Phase change; Composite; Thermal energy storage; Waste heat recovery; Waste management; Waste valorization; PHASE-CHANGE MATERIAL; CARBONATE-SALT; INDUSTRY; RESIDUE;

D O I：

10.1016/j.jhazmat.2021.125407

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

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 ?C is observed. Maximum latent heat of the CPCMs is 58 J/g, while average thermal conductivity and Cp are in the range of 0.77?0.83 W/mK and 1.03?1.31 J/g ?C, 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.

引用

页数：9

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