磷石膏快速干法稳定化的矿物特征研究

doi:10.19964/j.issn.1006-4990.2021-0525

Abstract

Abstract:

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

CLC Number:

TQ126.3

PENG Xiaoxi,WU Yi,HUANG Xiang,HAN Yuqi,ZHANG Li,HOU Jiang,YONG Yi. Study on mineral characteristics of phosphogypsum stabilized by rapid dry method[J]. Inorganic Chemicals Industry, 2022, 54(4): 24-28.

Figures/Tables 7

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References 18

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测试项目	ρ（As）/ （mg·L^-1）	ρ（Mn）/ （mg·L^-1）	ρ（Ni）/ （mg·L^-1）	ρ（Zn）/ （mg·L^-1）	ρ（Cr）/ （mg·L^-1）	ρ（Cu）/ （mg·L^-1）	ρ（Pb）/ （mg·L^-1）	ρ（Cd）/ （mg·L^-1）	ρ（F）/ （mg·L^-1）	ρ（P）/ （mg·L^-1）
GB 8978—1996《污水综合排放标准》一级标准限值	0.5	2.0	1.0	2.0	1.5	0.5	1.0	0.1	10	0.5
新鲜磷石膏水浸	ND	0.009	0.006	0.194	ND	0.003	0.012	0.015	328.75	47.33
GB 5085.3—2007《危险废物鉴别标准浸出毒性鉴别》浓度限值	5	—	5	100	15	100	5	1	100	—
新鲜磷石膏酸浸	ND	0.050	0.009	0.312	0.025	0.033	0.037	0.008	394.82	87.45

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Inorganic Acid-Base-Salt Committee of CIESC

Study on mineral characteristics of phosphogypsum stabilized by rapid dry method

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