Determining the recycled content in cement: A study of Austrian cement plants

IF 11.2 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL Resources Conservation and Recycling Pub Date : 2023-11-03 DOI:10.1016/j.resconrec.2023.107276

M.J. Enengel, S.A. Viczek, R. Sarc

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Abstract

Waste materials and industrial by-products are increasingly used in the production of cement clinker and cement, serving as secondary fuels, secondary raw materials, and supplementary cementitious materials. As these waste-derived materials are partially or fully incorporated into the product, they are technically recycled. Consequently, a certain proportion of the cement consists of recycled materials. This paper presents a method to calculate this recycled content in cement not only based on mass streams, but also based on valuable chemical components and compares the results for both calculation methods in the course of a case study of two Austrian cement plants. It is demonstrated that one metric ton of cement consists of 365 kg and 387 kg of secondary materials, respectively. This results in an average recycled content of 37.6 %. In addition, the contribution of primary and secondary materials to the heavy metal content of cement is assessed.

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水泥中再生含量的测定——对奥地利水泥厂的研究

废料和工业副产品越来越多地用于水泥熟料和水泥的生产，用作二次燃料、二次原料和补充胶凝材料。由于这些废物来源的材料部分或全部融入产品中，因此在技术上可以回收利用。因此，一定比例的水泥由回收材料组成。本文提出了一种不仅基于质量流，而且基于有价值的化学成分来计算水泥中这种再生含量的方法，并在对奥地利两家水泥厂的案例研究中对两种计算方法的结果进行了比较。据证明，一公吨水泥分别由365公斤和387公斤二次材料组成。这导致平均回收含量为37.6%。此外，还评估了主要和次要材料对水泥重金属含量的贡献。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Resources Conservation and Recycling 环境科学-工程：环境

CiteScore

22.90

自引率

6.10%

发文量

625

审稿时长

23 days

期刊介绍： The journal Resources, Conservation & Recycling welcomes contributions from research, which consider sustainable management and conservation of resources. The journal prioritizes understanding the transformation processes crucial for transitioning toward more sustainable production and consumption systems. It highlights technological, economic, institutional, and policy aspects related to specific resource management practices such as conservation, recycling, and resource substitution, as well as broader strategies like improving resource productivity and restructuring production and consumption patterns. Contributions may address regional, national, or international scales and can range from individual resources or technologies to entire sectors or systems. Authors are encouraged to explore scientific and methodological issues alongside practical, environmental, and economic implications. However, manuscripts focusing solely on laboratory experiments without discussing their broader implications will not be considered for publication in the journal.