Inorganic Chemicals Industry >
Study on crystallization characteristics and mineral flotation performance of industrial waste phosphogypsum
Received date: 2024-05-06
Online published: 2025-03-21
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
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 . DOI: 10.19964/j.issn.1006-4990.2024-0248
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