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Preparation of non-sintered lightweight aggregates through co-mechanochemical treatment of oil-contaminated drill cuttings, circulation fluidized bed combustion fly ash, and quicklime

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Abstract

This work investigates the feasibility of co-mechanochemical treatment of oil-contaminated drill cuttings (OCDC), circulation fluidized bed combustion (CFBC) fly ash, and quicklime to prepare non-sintered lightweight aggregates (NSLWAs). The NSLWAs with high cylinder compressive strength and low water absorption could be obtained under the condition of optimal water addition and appropriate steam-curing temperature, as well as steam-curing time. Co-mechanochemical treatment could enhance the pozzolanic reactivity of CFBC fly ash effectively, which is beneficial to the strength development of NSLWAs. Moreover, co-mechanochemical treatment also can degrade the petroleum hydrocarbon of OCDC, greatly reducing the leaching concentrations of total petroleum hydrocarbons (TPH) of NSLWAs. The final leaching concentrations of TPH are much lower than the requirements of Chinese National Standard GB 31571–2015.

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Funding

This work was supported by the Natural Science Foundation of China (No. 51404200), the Science and Technology Innovation Talent Foundation of Sichuan Province (No. 20132065), and the research fund from Southwest University of Science and Technology (No. 14tdgk04, 17lzx618, 18lzx654).

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Correspondence to Zhonghui Xu or Zao Jiang.

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The authors declare that they have no conflict of interest.

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Responsible editor: Bingcai Pan

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Chen, X., Xu, Z., Yao, Z. et al. Preparation of non-sintered lightweight aggregates through co-mechanochemical treatment of oil-contaminated drill cuttings, circulation fluidized bed combustion fly ash, and quicklime. Environ Sci Pollut Res 27, 20904–20911 (2020). https://doi.org/10.1007/s11356-020-08522-9

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  • DOI: https://doi.org/10.1007/s11356-020-08522-9

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