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

研究成果: Conference contribution

1 被引用数 (Scopus)

抄録

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.

本文言語English
ホスト出版物のタイトルAdvances in Molten Slags, Fluxes, and Salts
ホスト出版物のサブタイトルProceedings of the 10th International Conference on Molten Slags, Fluxes and Salts 2016
編集者Ramana G. Reddy, Pinakin Chaubal, P. Chris Pistorius, Uday Pal
出版社Springer International Publishing AG
ページ909-916
ページ数8
ISBN(印刷版)9783319486253
DOI
出版ステータスPublished - 2016 1 1
イベント10th International Conference on Molten Slags, Fluxes and Salts, MOLTEN 2016 - Seattle, United States
継続期間: 2016 5 222016 5 25

出版物シリーズ

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

Conference

Conference10th International Conference on Molten Slags, Fluxes and Salts, MOLTEN 2016
国/地域United States
CitySeattle
Period16/5/2216/5/25

ASJC Scopus subject areas

  • 機械工学
  • 材料力学
  • 材料化学
  • 金属および合金

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