Abstract Four Moroccan local industrial wastes were identified as potential high temperature (up to 1000 °C) thermal energy storage (TES) materials for application in solar tower power plants. These wastes are namely induction furnace slag (IFS) from the metallurgical industry, and three solid wastes from the coal-fired power plant industry (i.e. coal fly ashes (CFA), coal bottom ashes (CBA), and coal bottom clinker (CBC)). In the present paper, these wastes would be used as raw materials to develop/synthesize novel low-cost high-temperature TES materials for the same application. The main motive of this work is to manufacture enhanced versions of the selected wastes in order to eliminate their main points of weakness, i.e.: (1) their glassy form which restricts their structural strengths, (2) transform the wastes in the form of powder into solid crystalline materials with improved TES properties, and in the desired regular shapes. To fulfill this aim, a summary of the results of the different conducted characterizations on the four raw materials is presented. Then, the used synthesis method is described from the preparation of the raw materials formulations to the obtained final products. Finally, a laboratory experimental investigation was conducted on these obtained materials in order to assess their potential for TES application up to 1000 °C. Thus, their structural and thermophysical properties were evaluated, as well as their thermal stability up to 1000 °C. The obtained results suggest that most of the synthesized materials are good candidate materials for high-temperature thermal energy storage application (up to 1000 °C).

中文翻译：

---

从硅酸盐废料中合成高温 TES 材料用于太阳能塔式发电厂

摘要 四种摩洛哥当地工业废物被确定为潜在的高温（高达 1000 °C）热能储存 (TES) 材料，可用于太阳能塔式发电厂。这些废物分别是冶金行业的感应炉渣（IFS）和燃煤电厂行业的三种固体废物（即粉煤灰（CFA）、煤底灰（CBA）和煤底熟料（CBC）） ）。在本论文中，这些废物将被用作原材料来开发/合成用于相同应用的新型低成本高温 TES 材料。这项工作的主要动机是制造选定废物的增强版本，以消除它们的主要弱点，即：（1）限制其结构强度的玻璃状形式，(2) 将粉末形式的废物转化为具有改进的 TES 特性和所需规则形状的固体结晶材料。为了实现这一目标，对四种原材料进行不同表征的结果进行了总结。然后，从原料配方的制备到得到最终产品，描述了所使用的合成方法。最后，对这些获得的材料进行了实验室实验研究，以评估它们在高达 1000 °C 的 TES 应用中的潜力。因此，评估了它们的结构和热物理特性，以及它们高达 1000°C 的热稳定性。获得的结果表明，大多数合成材料是高温热储能应用（高达 1000°C）的良好候选材料。