Inorganic Chemicals Industry >
Study on mineral characteristics of phosphogypsum stabilized by rapid dry method
Received date: 2021-08-30
Online published: 2022-04-18
The main pollutants in fresh phosphogypsum are phosphorus and fluoride.Adding lime can effectively reduce the leaching level of fluorine and phosphorus.And the addition state and proportion have a great influence on the stabilization effect.The treatment method of phosphogypsum was stabilized by adding different lime proportion,the leaching level of pollutants was studied,and it was characterized by scanning electron microscope and energy spectrum.It was found that the mixing ratio of lime and phosphogypsum was an important factor affecting the leaching level of pollutants.When m（quicklime）∶m（fresh phosphogypsum） was 1∶50~1∶100,the stabilization effect was the best.The scanning electron microscope and energy spectrum showed that the fresh phosphogypsum was stacked in lamellar structure,and the surface microstructure was increased with the increase of lime addition.When m（quicklime）∶m（fresh phosphogypsum） was 1∶100,the lamellar structure of phosphogypsum would form a rod structure on the surface,and there were microsphere particles in the rod gap.According to the characterization results,it was speculated that the lamellar structure contained a certain amount of Ca3（PO4）2 in addition to CaSO4,the rod structure was Al2O3 and AlPO4,and the microsphere particle was CaF2.This kind of microstructure formed on the surface of fresh phosphogypsum stabilized the pollutants containing fluorine and phosphorus,thus reducing the leaching level.
Key words： phosphogypsum stabilization; lime; phosphorus; fluoride
Xiaoxi PENG , Yi WU , Xiang HUANG , Yuqi HAN , Li ZHANG , Jiang HOU , Yi YONG . Study on mineral characteristics of phosphogypsum stabilized by rapid dry method[J]. Inorganic Chemicals Industry, 2022 , 54(4) : 24 -28 . DOI: 10.19964/j.issn.1006-4990.2021-0525
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