Controlling sintering atmosphere to reduce the hazardous characteristics of low-energy cement produced with chromium compounds

Ying Liang Chen, Yi Chieh Lai, Chien Jung Lin, Yi Kuo Chang, Ming Sheng Ko

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Chromium is a common element present in cement clinkers, and its toxicity is highly related to the oxidation states. It is known that hexavalent chromium, Cr(VI), is much more toxic than other oxidation states, and is easily formed after a high-temperature burning process. This paper describes the influence of sintering atmosphere on phase transformation of dicalcium silicates (Ca 2SiO4, C2S) and chromium oxidation states in the production of a low-energy cement, and examines the chromium leachability of the resulting clinkers. The results show that C2S can be synthesized under both oxidizing and reducing atmospheres, and the presence of chromium including Cr(III) and Cr(VI) was effective in inhibiting C2S from transforming to the nonhydraulic γ phase. While the reducing atmosphere relatively increased the level of chromium evaporation, it prevented most of the residual chromium being Cr(VI) and reduced chromium leaching, and this therefore makes the resulting clinkers more environmentally-friendly.

Original languageEnglish
Pages (from-to)45-51
Number of pages7
JournalJournal of Cleaner Production
Volume43
DOIs
Publication statusPublished - 2013

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Environmental Science(all)
  • Strategy and Management
  • Industrial and Manufacturing Engineering

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