工业废料磷石膏结晶特征与矿物浮选性能研究

doi:10.19964/j.issn.1006-4990.2024-0248

Abstract

Abstract:

In this paper，the crystallization characteristics，mineral flotation performance and adsorption behavior of a solid waste phosphogypsum of a Sichuan enterprise were studied by means of metallographic microscope，SEM，reverse flotation method and Materials Studio software，so as to provide theoretical support for the subsequent impurity removal and whitening of phosphogypsum.Phosphogypsum was light yellow and transparent crystal under microscope，crystal shape was plate，columnar or rhomboid.By means of electron scanning microscope，it was found that silica，insoluble fluorine and insoluble phosphorus were mainly distributed on the surface of phosphogypsum crystal.Four minerals，CaSO₄·2H₂O，CaHPO₄·2H₂O，SiO₂ and CaF₂，were flotation by using kerosene，sodium oleate and dodecylamine as flotation agents，and the best flotation agent-dodecylamine was selected.At optimum pH value of 7 and optimum dosage of dodecylamine of 200 g/t，the recovery rate of phosphogypsum was 83.50%.The surface adsorption energy of phosphogypsum was calculated by using CASTEP module and Materials Studio，and the adsorption energy of calcium sulfate dihydrate was-9 511.19 eV.The adsorption energy of calcium hydrogen phosphate dihydrate was-7 294.05 eV.The adsorption energy of calcium fluoride was-3 935.56 eV.The adsorption energy of silica was-2 827.94 eV.

Key words: phosphogypsum, flotation agent, dodecylamine

CLC Number:

TQ126.3

LENG Manxi, ZHU Yu, YAN Jikang, XIE Ke, ZOU Yongjie. Study on crystallization characteristics and mineral flotation performance of industrial waste phosphogypsum[J]. Inorganic Chemicals Industry, 2025, 57(3): 108-115.

Figures/Tables 18

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元素	质量分数/%	元素	质量分数/%
Ca	18.000	Ba	0.060
S	13.000	Sr	0.040
Si	1.000	Mg	0.030
F	1.000	Ti	0.030
P	0.300	K	0.030
Al	0.200	Cl	0.008
Na	0.200	Y	0.002
Fe	0.080	—	—

晶面指数	多重性	面间距/ Å	距离/ Å	总面积/ %
（010）	4	8.54	11.71	52.38
（1-10）	2	7.57	13.20	17.82
（001）	2	6.20	16.12	21.19
（10-1）	4	5.36	18.66	8.62

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Inorganic Acid-Base-Salt Committee of CIESC

Study on crystallization characteristics and mineral flotation performance of industrial waste phosphogypsum

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