Using chemical experiments and plant uptake to prove the feasibility and stability of coal gasification fine slag as silicon fertilizer
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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.
KeywordsSolid waste disposal Coal gasification fine slag Silicon Fertilization Rice growth Environment friendly
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).
Compliance with ethical standards
In this study, neither human participant nor animals were involved.
Conflict of interest
The authors declare that they have no competing interests.
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