Improving the dissolution of phosphorus from 2CaO·SiO2- 3CaO·P2O5 solid solution in aqueous solutions

Chuan Ming Du; Xu Gao; Sunjoong Kim; Shigeru Ueda; Shin Ya Kitamura

doi:10.1007/978-3-319-48769-4_97

Improving the dissolution of phosphorus from 2CaO·SiO₂- 3CaO·P₂O₅ solid solution in aqueous solutions

Chuan Ming Du, Xu Gao, Sunjoong Kim, Shigeru Ueda, Shin Ya Kitamura

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

1 Citation (Scopus)

Abstract

Steelmaking slag is a potential P resource in Japan, because the P quantity in it is almost equal to that in imported phosphate ores. P₂O₅ is mainly concentrated in the 2CaO・SiO₂-3CaO・P₂O₅ solid solution in slag. It has been clarified that P can be selectively leached out from C₂S-C₃P rather than the matrix phase of slag. To recover P from slag, its dissolution ratio from C₂S-C₃P should be increased. In this study, the effects of leaching agent and Na₂SiO₃ modification on the dissolution of the C₂S-C₃P solid solution and slag in aqueous solutions have been investigated. H₃C₆H₅O₇ is beneficial for P dissolution from C₂S-C₃P in aqueous solutions because of the formation of the CaC₆H₅O₇ - complex, which can suppress phosphate precipitation. The P-rich phase is changed from the original C₂S-C₃P to C₂S-C₂NP with higher water solubility by Na₂SiO₃ modification, which facilitates P dissolution. At pH=5, 85.7% of P from the modified C₂S-C₃P can be dissolved in the H₃C₆H₅O₇ solution. The selective leaching of P from the CaOSiO₂- Fe₂O₃ system slag can be achieved by Na₂SiO₃ modification and leaching in the H₃C₆H₅O₇ solution at pH=5. The P dissolution ratio reaches 78.4%, and only 19.7% of Fe is dissolved.

Original language	English
Title of host publication	Advances in Molten Slags, Fluxes, and Salts
Subtitle of host publication	Proceedings of the 10th International Conference on Molten Slags, Fluxes and Salts 2016
Editors	Ramana G. Reddy, Pinakin Chaubal, P. Chris Pistorius, Uday Pal
Publisher	Springer International Publishing AG
Pages	909-916
Number of pages	8
ISBN (Print)	9783319486253
DOIs	https://doi.org/10.1007/978-3-319-48769-4_97
Publication status	Published - 2016 Jan 1
Event	10th International Conference on Molten Slags, Fluxes and Salts, MOLTEN 2016 - Seattle, United States Duration: 2016 May 22 → 2016 May 25

Publication series

Name	Advances in Molten Slags, Fluxes, and Salts: Proceedings of the 10th International Conference on Molten Slags, Fluxes and Salts 2016

Conference

Conference	10th International Conference on Molten Slags, Fluxes and Salts, MOLTEN 2016
Country	United States
City	Seattle
Period	16/5/22 → 16/5/25

Keywords

CS-CP solid solution
Leaching
NaSiO modification
Phosphorus recovery
Steelmaking slag

ASJC Scopus subject areas

Mechanical Engineering
Mechanics of Materials
Materials Chemistry
Metals and Alloys

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10.1007/978-3-319-48769-4_97

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Du, C. M., Gao, X., Kim, S., Ueda, S., & Kitamura, S. Y. (2016). Improving the dissolution of phosphorus from 2CaO·SiO₂- 3CaO·P₂O₅ solid solution in aqueous solutions. In R. G. Reddy, P. Chaubal, P. C. Pistorius, & U. Pal (Eds.), Advances in Molten Slags, Fluxes, and Salts: Proceedings of the 10th International Conference on Molten Slags, Fluxes and Salts 2016 (pp. 909-916). (Advances in Molten Slags, Fluxes, and Salts: Proceedings of the 10th International Conference on Molten Slags, Fluxes and Salts 2016). Springer International Publishing AG. https://doi.org/10.1007/978-3-319-48769-4_97

Improving the dissolution of phosphorus from 2CaO·SiO₂- 3CaO·P₂O₅ solid solution in aqueous solutions. / Du, Chuan Ming; Gao, Xu; Kim, Sunjoong; Ueda, Shigeru; Kitamura, Shin Ya.

Advances in Molten Slags, Fluxes, and Salts: Proceedings of the 10th International Conference on Molten Slags, Fluxes and Salts 2016. ed. / Ramana G. Reddy; Pinakin Chaubal; P. Chris Pistorius; Uday Pal. Springer International Publishing AG, 2016. p. 909-916 (Advances in Molten Slags, Fluxes, and Salts: Proceedings of the 10th International Conference on Molten Slags, Fluxes and Salts 2016).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Du, CM, Gao, X, Kim, S, Ueda, S & Kitamura, SY 2016, Improving the dissolution of phosphorus from 2CaO·SiO₂- 3CaO·P₂O₅ solid solution in aqueous solutions. in RG Reddy, P Chaubal, PC Pistorius & U Pal (eds), Advances in Molten Slags, Fluxes, and Salts: Proceedings of the 10th International Conference on Molten Slags, Fluxes and Salts 2016. Advances in Molten Slags, Fluxes, and Salts: Proceedings of the 10th International Conference on Molten Slags, Fluxes and Salts 2016, Springer International Publishing AG, pp. 909-916, 10th International Conference on Molten Slags, Fluxes and Salts, MOLTEN 2016, Seattle, United States, 16/5/22. https://doi.org/10.1007/978-3-319-48769-4_97

Du CM, Gao X, Kim S, Ueda S, Kitamura SY. Improving the dissolution of phosphorus from 2CaO·SiO₂- 3CaO·P₂O₅ solid solution in aqueous solutions. In Reddy RG, Chaubal P, Pistorius PC, Pal U, editors, Advances in Molten Slags, Fluxes, and Salts: Proceedings of the 10th International Conference on Molten Slags, Fluxes and Salts 2016. Springer International Publishing AG. 2016. p. 909-916. (Advances in Molten Slags, Fluxes, and Salts: Proceedings of the 10th International Conference on Molten Slags, Fluxes and Salts 2016). https://doi.org/10.1007/978-3-319-48769-4_97

Du, Chuan Ming ; Gao, Xu ; Kim, Sunjoong ; Ueda, Shigeru ; Kitamura, Shin Ya. / Improving the dissolution of phosphorus from 2CaO·SiO₂- 3CaO·P₂O₅ solid solution in aqueous solutions. Advances in Molten Slags, Fluxes, and Salts: Proceedings of the 10th International Conference on Molten Slags, Fluxes and Salts 2016. editor / Ramana G. Reddy ; Pinakin Chaubal ; P. Chris Pistorius ; Uday Pal. Springer International Publishing AG, 2016. pp. 909-916 (Advances in Molten Slags, Fluxes, and Salts: Proceedings of the 10th International Conference on Molten Slags, Fluxes and Salts 2016).

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abstract = "Steelmaking slag is a potential P resource in Japan, because the P quantity in it is almost equal to that in imported phosphate ores. P2O5 is mainly concentrated in the 2CaO・SiO2-3CaO・P2O5 solid solution in slag. It has been clarified that P can be selectively leached out from C2S-C3P rather than the matrix phase of slag. To recover P from slag, its dissolution ratio from C2S-C3P should be increased. In this study, the effects of leaching agent and Na2SiO3 modification on the dissolution of the C2S-C3P solid solution and slag in aqueous solutions have been investigated. H3C6H5O7 is beneficial for P dissolution from C2S-C3P in aqueous solutions because of the formation of the CaC6H5O7 - complex, which can suppress phosphate precipitation. The P-rich phase is changed from the original C2S-C3P to C2S-C2NP with higher water solubility by Na2SiO3 modification, which facilitates P dissolution. At pH=5, 85.7% of P from the modified C2S-C3P can be dissolved in the H3C6H5O7 solution. The selective leaching of P from the CaOSiO2- Fe2O3 system slag can be achieved by Na2SiO3 modification and leaching in the H3C6H5O7 solution at pH=5. The P dissolution ratio reaches 78.4%, and only 19.7% of Fe is dissolved.",

keywords = "CS-CP solid solution, Leaching, NaSiO modification, Phosphorus recovery, Steelmaking slag",

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AU - Kitamura, Shin Ya

PY - 2016/1/1

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N2 - Steelmaking slag is a potential P resource in Japan, because the P quantity in it is almost equal to that in imported phosphate ores. P2O5 is mainly concentrated in the 2CaO・SiO2-3CaO・P2O5 solid solution in slag. It has been clarified that P can be selectively leached out from C2S-C3P rather than the matrix phase of slag. To recover P from slag, its dissolution ratio from C2S-C3P should be increased. In this study, the effects of leaching agent and Na2SiO3 modification on the dissolution of the C2S-C3P solid solution and slag in aqueous solutions have been investigated. H3C6H5O7 is beneficial for P dissolution from C2S-C3P in aqueous solutions because of the formation of the CaC6H5O7 - complex, which can suppress phosphate precipitation. The P-rich phase is changed from the original C2S-C3P to C2S-C2NP with higher water solubility by Na2SiO3 modification, which facilitates P dissolution. At pH=5, 85.7% of P from the modified C2S-C3P can be dissolved in the H3C6H5O7 solution. The selective leaching of P from the CaOSiO2- Fe2O3 system slag can be achieved by Na2SiO3 modification and leaching in the H3C6H5O7 solution at pH=5. The P dissolution ratio reaches 78.4%, and only 19.7% of Fe is dissolved.

AB - Steelmaking slag is a potential P resource in Japan, because the P quantity in it is almost equal to that in imported phosphate ores. P2O5 is mainly concentrated in the 2CaO・SiO2-3CaO・P2O5 solid solution in slag. It has been clarified that P can be selectively leached out from C2S-C3P rather than the matrix phase of slag. To recover P from slag, its dissolution ratio from C2S-C3P should be increased. In this study, the effects of leaching agent and Na2SiO3 modification on the dissolution of the C2S-C3P solid solution and slag in aqueous solutions have been investigated. H3C6H5O7 is beneficial for P dissolution from C2S-C3P in aqueous solutions because of the formation of the CaC6H5O7 - complex, which can suppress phosphate precipitation. The P-rich phase is changed from the original C2S-C3P to C2S-C2NP with higher water solubility by Na2SiO3 modification, which facilitates P dissolution. At pH=5, 85.7% of P from the modified C2S-C3P can be dissolved in the H3C6H5O7 solution. The selective leaching of P from the CaOSiO2- Fe2O3 system slag can be achieved by Na2SiO3 modification and leaching in the H3C6H5O7 solution at pH=5. The P dissolution ratio reaches 78.4%, and only 19.7% of Fe is dissolved.

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KW - Phosphorus recovery

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