Functionalisation of MgO-C refractories based on recycled raw materails and their impact on steel cleanless

本项目将研究以回收的镁碳质原料为基础的镁碳质耐火材料的应用。使用回收的镁碳原料提供了经济和生态效益，特别是通过避免在电弧炉中制造昂贵的氧化镁材料。此外，由于钢/渣系统在高温下已经发生了反应，回收的材料将不那么活跃。因此，预计钢中夹杂物的数量较少。本项目的重点是研究不同镁碳质耐火材料使用新鲜材料和回收材料时钢中夹杂物的情况。另一项任务是改善热震性能，特别是通过添加纳米级和半导体材料。此外，还将研究回收原料和粘结剂中的杂质以及镁碳质耐火材料中碳的相互作用，特别是通过钢液中夹杂物的数量进行研究。在根据热震性能添加的积极影响的情况下，未来基于回收原料的镁碳质耐火材料可以使用更少的“新鲜”粘结剂以及更少的碳。

In this transfer project the application of MgO-C refractories based on recycled MgO-C raw materials will be investigated. The use of recycled MgO-C raw materials offers economial as well as ecological benefits especially by avoiding the expensive fabrication of MgO materials in an arc furncace. Further, the recycled material will be less reactive due to the fact that reactions have already taken place in the steel/slag-system at elevated temperatures. As a result, a lower amount of inclusions in steel is expected.The focus of the project is dealing with the investigation of inclusions in the steel based on different MgO-C refractories with fresh and recycled materials. Another task is the improvement of the thermal shock performance and especially by using nanoscalic and semiconducting material additions. Also the interactions with the impurities of the recycled raw material and the binder as well as the carbon of the MgO-C refractories will be investigated especially in means of the population of inclusions in the steel melt. In case of a positive impact of the additions according to the thermal shock performance less „fresh“ binder as well less carbon could be used in the future in MgO-C refractories based on recycled raw materials.