Engineering of tailored secondary oxide raw materials for sustainable solar heat absorber and storage media

化学成分的分散是工程材料制造中使用可持续的二次原料的障碍。在本研究中，旨在建立和评估一种科学的方法，使冶金残渣和回收细陶瓷作为添加剂有针对性地合成工程化二次原料。作为一个用例，通常在有色金属冶金中产生的铁矾副产物和陶瓷加工残留物应作为陶瓷颗粒的二次资源进行研究，这些陶瓷颗粒具有特定的热、光学和结构性能，可作为聚光太阳能发电厂（CSP）的耐高温吸收剂和存储介质。将陶瓷加工残渣（ZrO2和TiO2）作为掺杂剂加入到法氏体火法副产物中，以调整结晶过程和冶炼过程的产物，以提高功能性能。材料设计和合成包括适应掺杂/冶炼/冷却和随后的热处理过程，伴随着热化学建模。表征包括相和微观结构的演变，以及衍生的工程新陶瓷的热物理性质。性能将与未改性原料制备的最先进的陶瓷颗粒进行比较，以便比较新方法。热力学模型和实验结果将结合起来验证本研究的假设，并设计一个通用的、集成的模型工作流，将冶金副产品转化为有价值的人造矿物。

Scattering chemical composition is an obstacle for the employment of sustainable, secondary raw materials for the manufacturing of engineering materials. In this research, it is aimed to establish and assess a scientific methodology enabling the targeted synthesis of engineered secondary raw materials from metallurgical residues and recycled fine ceramics as additives. As a use case, fayalitic byproducts, commonly generated in nonferrous metallurgy, and ceramic processing residues shall be investigated as secondary resources for ceramic particles with specific thermal, optical and structural properties which are developed as high-temperature resistant absorber and storage media in concentrated solar power plants (CSP). Ceramic processing residues (ZrO2 and TiO2) will be added as dopants to the fayalitic pyrometallurgical by-products to tune the crystallization process and products of smelting process aiming to improve functional properties. Material design and syntheses include adapted doping/smelting/cooling and subsequent heat treatment processes, accompanied by thermochemical modelling. Characterization includes phase- and microstructural evolution as well as thermo-physical properties of derived engineered new ceramics. Properties will be compared with the state-of-the-art ceramic particles prepared from unmodified raw materials in order to compare the new methodology. Thermodynamic modelling and experimental results will be combined to validate this research's hypotheses and to design a generalized, integrated model workflow to transform metallurgical by-products into value added artificial minerals.