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Eco‐efficiency assessment of calcium sulfoaluminate clinker production
Journal of Industrial Ecology ( IF 5.9 ) Pub Date : 2019-12-04 , DOI: 10.1111/jiec.12967
José‐Luis Gálvez‐Martos 1 , Antonio Valente 1, 2 , Mathías Martínez‐Fernández 1 , Javier Dufour 1, 2
Affiliation  

Calcium sulfoaluminate‐based cements (CSA) are proposed as a cement alternative with a low carbon footprint. The nature of CSA makes the manufacturing process to require lower temperature, less fuel, and less calcite. However, it requires aluminum oxide, Al2O3, which would be originated from bauxite and bauxite‐derived wastes, and sulfur, coming from calcium sulfate or elemental sulfur. An eco‐efficiency assessment of CSA cements, benchmarked against the conventional Portland cement, has been performed following the principles of ISO 14045 on eco‐efficiency for a total of 240 CSA clinker production scenarios. The eco‐efficiency indicator relates an environmental indicator with a product system value indicator, and it is calculated for each of the studied parameters: bauxite geographical origin, the fuel used for clinkering, the source of sulfur, and the composition of the clinker. Eco‐efficiency results show a strong dependence on the origin of bauxite, while other parameters, as the fuel used, its content in sulfur, or the supply of other raw materials, are of less importance. The most eco‐efficient solutions are those with certain closeness to bauxite sources. To achieve global solutions, that is, cement‐making based on CSA independently of the origin of the raw materials, the amount of bauxite needs to be minimized and CSA composition restricted.

中文翻译:

硫铝酸钙熟料生产的生态效益评估

有人建议将硫铝酸钙基水泥(CSA)用作低碳足迹的水泥替代品。CSA的性质使制造过程需要更低的温度,更少的燃料和更少的方解石。但是,它需要氧化铝Al 2 O 3源自铝土矿和铝土矿废料,以及来自硫酸钙或元素硫的硫。按照ISO 14045的生态效率原则,对240个CSA熟料生产方案进行了以常规波特兰水泥为基准的CSA水泥生态效率评估。生态效率指标将环境指标与产品系统价值指标相关联,并针对每个研究的参数进行计算:铝土矿的地理来源,用于熟料的燃料,硫的来源以及熟料的成分。生态效率结果表明铝土矿的来源高度依赖,而其他参数(如所使用的燃料,其硫含量或其他原材料的供应)则不那么重要。最生态高效的解决方案是与铝土矿源具有一定距离的解决方案。为了实现全球解决方案,即基于CSA的水泥生产独立于原材料的来源,铝土矿的量需要最小化,并且CSA的组成必须受到限制。
更新日期:2019-12-04
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