Inorganic Chemicals Industry >
Study on rapid deposition technology of wet process concentrated phosphoric acid
Received date: 2024-10-31
Online published: 2025-02-17
The viscosity of wet process concentrated phosphoric acid is high，and it is difficult for fine-grained suspended solids to settle quickly，which reduces the processing and production efficiency of phosphorus chemical products.In this paper，the effects of defluorination agent type，defluorination temperature，pressure and time on the fluorine content and sedimentation of wet process concentrated phosphoric acid were studied.The results showed that the mass fraction of fluorine in wet concentrated phosphoric acid was only 0.38%，and the sedimentation time was much lower than that of other sedimentation technologies，when the defluorination agent was silica，the vacuum degree was 0.08 MPa，the reaction temperature was 85 ℃ and the reaction time was 2.0 h.The sedimentation time was positively correlated with the fluorine content.The lower the fluorine content，the shorter the sedimentation time of wet process concentrated phosphoric acid.The precipitates before and after defluorination of wet process concentrated phosphoric acid were analyzed by X-ray photoelectron spectroscopy（XPS），X-ray diffraction（XRD） and scanning electron microscopy（SEM）.The results showed that the main reason affecting the sedimentation rate was that the fine-grained CaSO4·2H2O in the solution was difficult to settle.Under a certain temperature and pressure，the fine-grained CaSO4·2H2O was recrystallized，the particle size was increased，and it was easy to settle.Secondly，the concentration and heating process disrupted the complexation bonds between metal cations and fluoride ions in wet process concentrated phosphoric acid，causing the solubility of the complex. It disrupted the colloid stability of the complex，causing fluoride to escape from the system.Simultaneously，the released metal ions formed new substances that induced the agglomeration of solid phase particles，further increasing the size and density of particles.Thereby the sedimentation of wet process concentrated phosphoric acid was accelerated.The results of this study provided a new method for the rapid sedimentation of wet process concentrated phosphoric acid.
YANG Wenjuan , GONG Li , FU Yizhong , JIANG Wei , TU Zhongbing , XIE Mi , ZHU Guihua . Study on rapid deposition technology of wet process concentrated phosphoric acid[J]. Inorganic Chemicals Industry, 2025 , 57(11) : 59 -64 . DOI: 10.19964/j.issn.1006-4990.2024-0573
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