Design of a Novel Fertilizer Made of Steelmaking Slag Using the Glassy Phase of the CaO–SiO2–FeO System. Part I: Optimization on the Slag Chemistry and Microstructure

Koizumi, Shohei; Gao, Xu; Ueda, Shigeru; Kitamura, Shin Ya

doi:10.1007/s40831-020-00320-4

Cited by 8 publications

(3 citation statements)

References 28 publications

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“…Leaching experiments performed in this study was identical to that reported in previous studies [18,21]. One gram of slag powder was added to 400 mL of ion-exchanged water, and the resulting slurry was agitated using a rotating stirrer.…”

Section: Methodsmentioning

confidence: 76%

“…They found the dissolution ratio of each element depends on mass fraction of mineralogical phases in steelmaking slag, and an improved fertilizer which supplies Ca and Si can be made by modifying mineral composition. To simultaneously supply Ca, Si, and Fe to paddy field, Koizumi et al [17,18] investigated the dissolution behavior of Fe-bearing glassy phases and clarified the influence mechanism of slag composition and structure on the Fe dissolution from slag. The optimum slag chemistry as a fertilizer was found to have a basicity of about 1.6 and FeO content of about 25 mass%, referring to the CaO-SiO 2 -FeO system.…”

Section: Introductionmentioning

confidence: 99%

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Dissolution behavior of nutrient elements from dephosphorization slag in the weakly acidic solution

Kong

et al. 2021

J Mater Cycles Waste Manag

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Dephosphorization slag is primarily composed of CaO-SiO 2 -FeO-P 2 O 5 slag system. As it contains abundant valuable components, dephosphorization slag is considered a potential material to restore the degraded acid soil. To efficiently supply Ca, Si, Fe, and P elements for acid soil, the dissolution behavior of dephosphorization slag with high P 2 O 5 content in the weakly acidic solution was investigated. It was found that the existence of citric acid could significantly promote the dissolution of slag in the aqueous solution. Most of the Ca, Si, and P was dissolved from slag at pH 5, and the Fe dissolution ratio reached 36.9%. In this case, the precipitation of Fe 3 (PO 4 ) 2 •8H 2 O was suppressed, and the majority of C 2 S-C 3 P solid phase and matrix phase was dissolved while wustite remained in the residue. The dissolution ratios of main elements from slag decreased dramatically as the pH increased. Only in the weakly acidic solution, it could make full use of dephosphorization slag, and large amounts of nutrient elements were simultaneously supplied. The dissolution ratios of nutrient elements decreased with the increase in particle size. The dissolution kinetics of slag in the citric acid solution followed the shrinking core model.

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Section: Methodsmentioning

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Dissolution behavior of nutrient elements from dephosphorization slag in the weakly acidic solution

Kong

et al. 2021

J Mater Cycles Waste Manag

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“…1) However, it is considered that the amount of steelmaking slag used in those applications will decrease due to competition with byproducts and wastes generated in other industries. 2) Therefore, new applications of steelmaking slag for the promotion of phytoplankton growth and seaweed bed formation in coastal area and the salt removal in farmland damaged by the tsunami [35][36][37][38][39][40][41][42][43][44] have been explored. On the other hand, some proposals have been made to minimize the slag amount by reusing it in steelworks and to recover valuable components in the slag such as phosphorus and iron.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cooling Condition and Oxidation of P-concentrated Slag on Phosphorus Dissolution Behavior

Iwama

Inoue

Nakase³

et al. 2023

ISIJ Int.

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Sustainable and clean utilization of coal gangue: activation and preparation of silicon fertilizer

Zhao

Deng

et al. 2022

J Mater Cycles Waste Manag

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Silicon (Si) fertilizer is of great signi cance to modern agricultural production; the citrate-soluble silicon fertilizer based on coal gangue is one way to protect the environment and meet the agricultural needs of China. In this study, we produced high-e ciency coal-gangue based silicon fertilizer by calcining a mixture of coal gangue, calcium carbonate (CaCO 3 ) and corn stalk powder at high-temperature (i.e., high-temperature activation technology); the effect of temperature and mixing ratio on the available-Si content of activated coal gangue was studied, followed by an analysis of the mechanism of available-Si formation. The results showed that the layered structure of coal gangue was severely damaged above 600 ℃, and the kaolin began to transform into metakaolin and other substances, where the available-Si content was not high (less than 10%). When CaCO 3 alone was added, the peak intensity of quartz and muscovite in coal gangue decreased signi cantly with the increase of CaCO 3. However, CaCO 3 mainly played a catalytic role in the entire calcination and activation process, forming only a small amount of calcium silicate on the contact surface with coal gangue; however, the available-Si content was still below 12.60%. When corn stalk powder alone was added, the oxides of the corn stalk ash participated in the chemical reaction involving coal gangue, forming nepheline (K(Na, K) 3 Al 4 Si 4 O 16 ) and other silicates, and the available-Si content was signi cantly higher than that with CaCO 3 . When coal gangue, CaCO 3 , and corn stalk powder were mixed and calcined, the available-Si content was as high as 22.97% under the synergistic effect of CaCO 3 and corn stalk powder; the concentration of harmful heavy metals was below 0.025 mg/L. The above is in line with the requirements of silicon fertilizer for use in agriculture, thus con rming the preparation of coal gangue-based silicon fertilizer in an e cient manner.

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Design of a Novel Fertilizer Made of Steelmaking Slag Using the Glassy Phase of the CaO–SiO2–FeO System. Part I: Optimization on the Slag Chemistry and Microstructure

Cited by 8 publications

References 28 publications

Dissolution behavior of nutrient elements from dephosphorization slag in the weakly acidic solution

Dissolution behavior of nutrient elements from dephosphorization slag in the weakly acidic solution

Effect of Cooling Condition and Oxidation of P-concentrated Slag on Phosphorus Dissolution Behavior

Sustainable and clean utilization of coal gangue: activation and preparation of silicon fertilizer

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