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 proceedingConference 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 languageEnglish
Title of host publicationAdvances in Molten Slags, Fluxes, and Salts
Subtitle of host publicationProceedings of the 10th International Conference on Molten Slags, Fluxes and Salts 2016
EditorsRamana G. Reddy, Pinakin Chaubal, P. Chris Pistorius, Uday Pal
PublisherSpringer International Publishing AG
Pages909-916
Number of pages8
ISBN (Print)9783319486253
DOIs
Publication statusPublished - 2016 Jan 1
Event10th International Conference on Molten Slags, Fluxes and Salts, MOLTEN 2016 - Seattle, United States
Duration: 2016 May 222016 May 25

Publication series

NameAdvances 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
CountryUnited States
CitySeattle
Period16/5/2216/5/25

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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