PURIFICATION OF PHOSPHOGYPSUM FOR USE AS CEMENT RETARDER BY SULPHURIC ACID TREATMENT

Authors

  • Dang Ngoc Phuong Institute of Natural Products Chemistry - Vietnam Academy of Science and Technology
  • Ngo Kim Chi Institute of Natural Products Chemistry - Vietnam Academy of Science and Technology
  • Tran Dai Lam Institute of tropical technology - Vietnam Academy of Science and Technology
  • Chu Quang Truyen Institute of Natural Products Chemistry - Vietnam Academy of Science and Technology
  • Tran Trung Kien
  • Dang Thi Dinh Hanoi University of Science and TechnologyVi

DOI:

https://doi.org/10.15625/2525-2518/58/3A/14246

Keywords:

2.10.3, 3.7.3, 3.3.2

Abstract

Phosphogypsum is a by-product of the wet phosphoric acid production. In this study, chemical compositions of phosphogypsum waste (PG) in Hai Phong diammonium phosphate plant (DAP1) and Lao Cai diammonium phosphate plant (DAP2) in Vietnam were surveyed for the purpose of gypsum recovery by P2O5, F removal to meet TCVN11833 for use treated gypsum as cement retarder. Studies of impurities P2O5, F, TOC removal by sulfuric acid 10 % at 28 0C was presented. The results found that the combination of a low concentration of sulfuric acid treatment, washing, lime neutralizing, and thermal treatment was successful in Phoshogypsum treatment for use as cement retarder. The cement test proved that treated PG could partially replace natural gypsum as a retarder.

Keywords:  phosphogypsum treatment, phosphorus pentoxide removal, calcium sulfate transition phase, cement retarder.

 

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Author Biographies

Dang Ngoc Phuong, Institute of Natural Products Chemistry - Vietnam Academy of Science and Technology

Researcher

Research and Development Department on Natural Resource Processing and Environmental Protection

 

Tran Dai Lam, Institute of tropical technology - Vietnam Academy of Science and Technology

Researcher

Research and Development Department on Natural Resource Processing and Environmental Protection

 

Tran Trung Kien

Hanoi University of Science and Technology

References

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Published

2020-05-25

Issue

Section

INTERNATIONAL FORUM ON GREEN TECHNOLOGY AND MANAGEMENT (IFGTM2021)