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Using chemical experiments and plant uptake to prove the feasibility and stability of coal gasification fine slag as silicon fertilizer

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Abstract

Coal gasification fine slag (CGFS) is a kind of industrial waste that is generated from entrained-flow coal gasification with a high content of 0.5 M hydrochloric acid (HCl)-extractable silicon (Si). Si fertilizer has been widely used in agriculture to enhance the mechanical properties and yield of crops. An evaluation was actualized by analyzing HCl-extractable Si fractions and X-Ray diffraction (XRD) of different treatments (acid, alkali, salt, grind, calcination, temperature, and time) for CGFS samples and other Si source materials. The results showed that CGFS had stable HCl-extractable Si concentrations of 60 ± 2 g/kg except in the calcination treatment, which decreased the content of extractable Si by 28.2%. Furthermore, under the same processing conditions, CGFS showed a higher content of extractable Si than other Si source samples. Moreover, a rice growth experiment was carried out for 120 days in a different mass incorporation of CGFS in the greenhouse. The strength index and total Si content of the stem proved that using CGFS at 5 wt.% markedly promoted the growth of rice. The study indicated that an appropriate application of CGFS as a Si resource to an agricultural field could be considered as a viable option for safe disposal of this industrial waste.

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Funding

This work was supported by the National Natural Science Foundation of China (NO.51874145) and the Province/Jilin University co-construction project—funds for new materials (SXGJSF2017-3).

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Correspondence to Cundi Wei.

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In this study, neither human participant nor animals were involved.

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The authors declare that they have no competing interests.

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Responsible editor: Philippe Garrigues

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Zhu, D., Xue, B., Jiang, Y. et al. Using chemical experiments and plant uptake to prove the feasibility and stability of coal gasification fine slag as silicon fertilizer. Environ Sci Pollut Res 26, 5925–5933 (2019). https://doi.org/10.1007/s11356-018-4013-8

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  • DOI: https://doi.org/10.1007/s11356-018-4013-8

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