IMPLICATION OF PHOSPHATE SOURCE TYPES ON DISTRIBUTION OF PRIMES IN THE SYSTEM CaSO4 – H3PO4 – H2O IN ORTHOPHOSPHORIC ACID PRODUCTION

UDC 661.634.22:661.8’045.4/.5

 

Dormeshkin Oleg Borisovich – DSc (Engineering), Professor, Director of the International Information and Analytical Center for Technology Transfer. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: dormeshkin@yandex.ru

Hauryliuk Andrey Nikolayevich – PhD (Engineering), Associate Professor, Vice Rector for Academic Affairs. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: gavriluk_andrew@mail.ru

Mokhart Mark Sergeevich – PhD student, the Department of Inorganic Materials Technology and General Chemical Technology. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: markmohort@gmail.com

Byshyk Aleksandr Aleksandrovich – Master’s degree student, the Department of Inorganic Materials Technology and General Chemical Technology. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: fxguru29@gmail.com

 

DOI: https://doi.org/ 10.52065/2520-2669-2024-283-13.

Key words: phosphate raw materials, acid processing, mineralogical composition, wet-process phosphoric acid, fluorine, sesquioxides, impurities, phosphogypsum, technical and economic indicators.

For citation: Dormeshkin О. B., Hauryliuk А. N., Mokhart М. S., Byshyk А. А. Implication of phosphate source types on distribution of primes in the system CaSO4 – H3PO4 – H2O in orthophosphoric acid production. Proceedings of BSTU, issue 2, Chemical Engineering, Biotechnologies, Geoecology, 2024, no. 2 (283), pp. 106–114 (In Russian). DOI: 10.52065/2520-2669-2024-283-13.

Abstract

Results of the study of the influence of the composition of different types of phosphate raw materials on the distribution of impurities in the production of wet process phosphoric acid are presented. The data on the chemical and mineralogical composition of the studied types of raw materials are given. The highest fluorine content is present in samples of Kovdor apatite. The content of semi-fluorine oxides for all types of raw materials under study ranges from 0.96 to 2.30%, and magnesium compounds do not exceed 3.5% (for Karatau phosphate rock). Significant differences in the mineralogical composition of the studied types of phosphate raw materials have been established, in particular, for Kovdor apatite over 90% of phosphorus is contained in fluorapatite, and for Moroccan phosphorites, the main part of phosphorus and fluorine is contained in hydroxyapatite and carbonatapatite. It is shown that the differences in mineralogical composition lead to a significant change in the character of fluorine distribution between separate phases, as well as in the process of fluorine release into the gas phase as a whole. The significant influence of defoamer on the distribution of fluorine between liquid and gas phases at the stage of acid decomposition was established, which allowed us to conclude that the introduction of defoamers is advisable not only for the optimal course of the acid decomposition process but also for reducing the residual fluorine content in the productive acid. It has been established that wet-process phosphoric acid obtained based on different types of phosphate raw materials under the same conditions of technological regime differs insignificantly in the content of sulfates. At the same time, the main amount of sulfates contained in the feedstock remains in the phosphogypsum. The correlation between the content of semi-fluorine oxides in the feedstock and liquid phase is shown.

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19.02.2024