Chair of Thermal Processing Technology, Montanuniversitaet Leoben, Leoben, Austria.
Institute for Technology and Testing of Building Materials, Graz University of Technology, Graz, Austria.
Waste Manag Res. 2024 Sep;42(9):797-805. doi: 10.1177/0734242X241240040. Epub 2024 Apr 7.
The decarbonisation of the steel and cement industry is of utmost importance in tackling climate change. Hence, steel production in modern integrated steel mills will be shifted towards electric arc furnaces in the future, in turn causing dwindling supplies of blast furnace slag, which is used as a supplementary cementitious material to reduce the CO emissions of cement production. Achieving a sustainable circular steel and building material economy requires the valorisation of currently landfilled steel slags and investigating utilisation options for electric arc furnace slag, which is increasingly being generated. For this purpose, different metallurgical residues and by-products were treated by carbothermal reduction in an inductively heated graphite crucible and then rapidly cooled by wet granulation, yielding a slag fraction similar to granulated blast furnace slag and a metal fraction valuable as a secondary raw material. A spreadsheet-based model was developed to calculate residue combinations to accomplish target compositions of the slag and metal fractions to fulfil previously identified requirements of the targeted cementitious and ferrous products. The results demonstrate the high accuracy of the model in predicting the properties (e.g. main oxide composition) of the generated slag and metal fraction, which fulfil the needed requirements for their use as (i) a supplementary cementitious material and (ii) a secondary raw material in steel production.
实现钢铁和建筑材料经济的可持续循环需要对目前填埋的钢铁渣进行增值利用，并研究日益增加的电弧炉渣的利用选择。为此，不同的冶金渣和副产品通过感应加热石墨坩埚中的碳热还原进行处理，然后通过湿磨粒化快速冷却，得到类似于粒化高炉渣的渣部分和作为二次原料有价值的金属部分。开发了一个基于电子表格的模型来计算残余物组合，以实现渣和金属部分的目标成分，从而满足之前确定的目标水泥和黑色金属产品的要求。结果表明，该模型在预测生成的渣和金属部分的特性（例如主要氧化物组成）方面具有很高的准确性，这些特性满足了将其用作（i）补充水泥材料和（ii）钢铁生产中的二次原料的要求。
