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Volume 31 Issue 7
Jul.  2024
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Article Navigation >  International Journal of Minerals, Metallurgy and Materials  > 2024  >  31(7): 1480-1499
Yikai Liu, Yunmin Wang, and Qiusong Chen, Using cemented paste backfill to tackle the phosphogypsum stockpile in China: A down-to-earth technology with new vitalities in pollutant retention and CO2 abatement, Int. J. Miner. Metall. Mater., 31(2024), No. 7, pp. 1480-1499. https://doi.org/10.1007/s12613-023-2799-y
Cite this article as:
Yikai Liu, Yunmin Wang, and Qiusong Chen, Using cemented paste backfill to tackle the phosphogypsum stockpile in China: A down-to-earth technology with new vitalities in pollutant retention and CO2 abatement, Int. J. Miner. Metall. Mater., 31(2024), No. 7, pp. 1480-1499. https://doi.org/10.1007/s12613-023-2799-y
shu
Invited Review

Using cemented paste backfill to tackle the phosphogypsum stockpile in China: A down-to-earth technology with new vitalities in pollutant retention and CO2 abatement

+ Author Affiliations
  • Corresponding author:

    Qiusong Chen    E-mail: qiusong.chen@csu.edu.cn

  • Received: 13 June 2023; Revised: 27 November 2023; Accepted: 28 November 2023; Available online: 1 December 2023
    Abstract
  • Phosphogypsum (PG), a hard-to-dissipate by-product of the phosphorus fertilizer production industry, places strain on the biogeochemical cycles and ecosystem functions of storage sites. This pervasive problem is already widespread worldwide and requires careful stewardship. In this study, we review the presence of potentially toxic elements (PTEs) in PG and describe their associations with soil properties, anthropogenic activities, and surrounding organisms. Then, we review different ex-/in-situ solutions for promoting the sustainable management of PG, with an emphasis on in-situ cemented paste backfill, which offers a cost-effective and highly scalable opportunity to advance the value-added recovery of PG. However, concerns related to the PTEs’ retention capacity and long-term effectiveness limit the implementation of this strategy. Furthermore, given that the large-scale demand for ordinary Portland cement from this conventional option has resulted in significant CO2 emissions, the technology has recently undergone additional scrutiny to meet the climate mitigation ambition of the Paris Agreement and China’s Carbon Neutrality Economy. Therefore, we discuss the ways by which we can integrate innovative strategies, including supplementary cementitious materials, alternative binder solutions, CO2 mineralization, CO2 curing, and optimization of the supply chain for the profitability and sustainability of PG remediation. However, to maximize the co-benefits in environmental, social, and economic, future research must bridge the gap between the feasibility of expanding these advanced pathways and the multidisciplinary needs.
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