全工业固废原料制备水泥工艺的生命周期评价研究

运用生命周期评价(LCA)方法,对以电石渣等工业固废为全部原料的水泥制造工艺产生的环境影响进行评价.通过对生产工艺进行分解及建模,基于实际数据建立生命周期清单,利用ReCiPe2016方法,在全球变暖、化石资源消耗、土地占用等17个小类及人体健康影响、生态系统影响及资源消耗3个大类中对工艺产生的环境影响进行评价.评价过程包括特征化、标准化和敏感性分析.结果表明,在以1 t成品水泥为功能单位的生产过程中,造成的环境影响总值为-0.0045 pt,其中,在人体健康影响和生态系统影响分类下最为显著,分别为-0.0027 pt和-0.0020 pt.与传统水泥生产相比,本工艺具有更低的资源能源消耗与碳排放量.固废作为原料来源带来的正面环境效益最为显著,而熟料煅烧与水泥粉磨则显示出最大的环境损害,也说明由于消纳了大量工业固废,本工艺对环境总体上是有益的.

Life cycle assessment of cement manufacture solely from industrial solid waste

The environmental impact of the cement manufacturing using soly industrial solid waste such as calcium carbide slag as raw materials is evaluated by life cycle assessment (LCA). By breaking down and modeling the production process, establishing a life cycle list (LCI) based on actual data, the environmental impact is evaluated, using the ReCiPe2016 evaluation method. Evaluating processes include characterization, normalization and sensitive analysis. The results show that the total environmental impact of the process with 1 ton of cement product is -0.0045 pt, which is significant on human impact and ecosystems with the value of -0.0027 pt and -0.0020 pt, respectively. Compared to traditional cement production, this new production method has lower resources consumption and carbon emission. The positive environmental benefits brought by raw material acquisition from solid waste are the most outstanding, while clinker calcination and cement grinding show the highest environmental damage. It shows that this process is beneficial to the environment as a whole as it can consume a large amount of industrial solid waste.