二水法湿法磷酸体系降低磷石膏中共晶磷损失的工艺研究

doi:10.19964/j.issn.1006-4990.2024-0507

Abstract

Abstract:

In the process of wet-process phosphoric acid production，eutectic phosphorus in phosphogypsum is the key factor leading to the waste of phosphorus resources.Solving the problem of eutectic phosphorus loss is of great significance to phosphoric acid production.In order to reduce the loss of eutectic phosphorus in dihydrate wet-process phosphoric acid process and improve economic efficiency，the production process of wet-process phosphoric acid by dihydrate method without solid phase was simulated in Ca（H₂PO₄）₂-H₃PO₄-H₂SO₄ system.The effects of reaction temperature，liquid P₂O₅ concentration，aging time and liquid SO₃ concentration on the eutectic phosphorus content of phosphogypsum were investigated.The results showed that when the reaction temperature was 75 ℃，the mass fraction of liquid-phase P₂O₅ was 26%，the aging time was 3.0 h，and the excess of 3.0% sulfuric acid（the concentration of SO₃ in liquid phase was 41.19 g/L） was added to the return acid，the eutectic phosphorus content in phosphogypsum was significantly reduced to 0.21%.Comparing the differences in the morphology of calcium sulfate dihydrate crystals formed under different reaction conditions，it was observed that the calcium sulfate dihydrate crystals formed by the reaction system are mainly plate-like and rod-like crystals，and the dominant growth of the long rod-like crystal in the radial direction was beneficial to reduce the content of eutectic phosphorus in phosphogypsum.In this experiment，the change of eutectic phosphorus content and its crystal morphology in phosphogypsum were studied，which was conducive to a more comprehensive understanding of the formation mechanism of eutectic phosphorus.At the same time，it provided reference value for the actual production of dihydrate wet-process phosphoric acid to select appropriate process parameters.

Key words: wet process phosphoric acid, phosphogypsum, eutectic phosphorus, phosphorus loss

CLC Number:

TQ126.35

HE Lin, YANG Guanghong, LI Jun. Study on process of reducing loss of eutectic phosphorus in phosphogypsum by dihydrate wet-process phosphoric acid system[J]. Inorganic Chemicals Industry, 2025, 57(9): 30-36.

Figures/Tables 11

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实验组别	过量硫酸量/%	液相SO₄^2- 质量分数/%	液相SO₃质量浓度/（g·L^-1）
1	1.0	2.240 6	23.73
2	1.5	2.669 2	28.36
3	2.0	2.867 8	30.43
4	2.5	3.401 2	36.45
5	3.0	3.927 5	41.19

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Inorganic Acid-Base-Salt Committee of CIESC

Study on process of reducing loss of eutectic phosphorus in phosphogypsum by dihydrate wet-process phosphoric acid system

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