Scholarlink

<p>We report here the electrochemical production of cement clinker precursor, containing calcium derived from the electrolytic decomposition of waste cement. Our “cement recycler” contains a cement electrolyzer, coupled to a cement digestion vessel, and a Ca(OH)<sub>2</sub> isolation vessel. The cement electrolyzer creates acid and base equivalents, and converts waste cement into Ca(OH)<sub>2</sub> and SiO<sub>2</sub>. The electrolyzer was demonstrated at current densities up to 300 mA cm<sup>–2</sup> to produce yields higher than 80% for Ca(OH)<sub>2</sub>. We experimentally verified a 99.8% reduction in CO<sub>2</sub> emissions when using fresh waste cement, and an 80% reduction when using aged cement (enriched in CO<sub>2</sub> due to atmospheric carbonation) from a demolition site. Our cement recycler bypasses the need for virgin limestone and could cut global CO<sub>2</sub> emissions by nearly 1 Gt annually, while also helping divert substantial waste cement from landfills.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Low-emission cement clinker precursor production, enabled by electrolytic extraction of calcium from waste cement

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年10月21日

查看全文
  • Tengxiao Ji,
  • Shaoxuan Ren,
  • Yumeng Yang,
  • Gaopeng Jiang,
  • Giuseppe V. Crescenzo,
  • Sabrina S. Scott,
  • Yongwook Kim,
  • Aubry S. R. Williams,
  • Jordan Rumscheidt,
  • Monika Stolar,
  • Curtis P. Berlinguette

摘要

We report here the electrochemical production of cement clinker precursor, containing calcium derived from the electrolytic decomposition of waste cement. Our “cement recycler” contains a cement electrolyzer, coupled to a cement digestion vessel, and a Ca(OH)2 isolation vessel. The cement electrolyzer creates acid and base equivalents, and converts waste cement into Ca(OH)2 and SiO2. The electrolyzer was demonstrated at current densities up to 300 mA cm–2 to produce yields higher than 80% for Ca(OH)2. We experimentally verified a 99.8% reduction in CO2 emissions when using fresh waste cement, and an 80% reduction when using aged cement (enriched in CO2 due to atmospheric carbonation) from a demolition site. Our cement recycler bypasses the need for virgin limestone and could cut global CO2 emissions by nearly 1 Gt annually, while also helping divert substantial waste cement from landfills.