STUDY OF THE FEATURES OF SULFURIC ACID DECOMPOSITION OF DIFFERENT GRADES OF MOROCCA PHOSPHORITES

UDC 661.833

  • Hauryliuk Andrey Nikolayevich − PhD (Engineering), Assistant Professor, Head of the Department of Inorganic Materials Technology and General Chemical Technology. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: gavriluk_andrew@mail.ru

  • Dormeshkin Oleg Borisovich − DSc (Engineering), Professor, Professor, the Department of Inorganic Materials Technology and General Chemical Technology. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: dormeshkin@yandex.ru

  • Rusak Inna Anatol’yevna − Master’s degree student. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus); Process Engineer. OJSC “Gomel Chemical Plant” (5, Khimzavodskaya str., 246026, Gomel, Republic of Belarus). E-mail: antonlin19@mail.ru

DOI: https://doi.org/10.52065/2520-2669-2022-259-2-115-126

Key words: phosphorites, phase composition, acid decomposition, phosphogypsum, degree of decomposition, phase, calcium sulfate, sulfate mode, crystal size.

For citation: Hauryliuk A. N., Dormeshkin O. B., Rusak I. A. Study of the features of sulfuric acid decomposition of different grades of morocca phosphorites. Proceedings of BSTU, issue 2, Chemical Engineering, Biotechnologies, Geoecology, 2022, no. 2 (259), pp. 115–126 (In Russian). DOI: https://doi.org/10.52065/2520-2669-2022-259-2-115-126.

Abstract

The possibility of processing various grades of Moroccan phosphorites into extraction phosphoric acid and complex fertilizers by sulfuric acid decomposition has been studied. Based on the data obtained, it can be concluded that the nature of the dependences of the decomposition coefficients of these types of phosphate raw materials on the concentration of sulfuric acid have a rather complex form, which is due to the peculiarities of the mineralogical composition. At the same time, the size, shape and morphology of the precipitate crystals formed in this case differ significantly depending on the concentration of sulfuric acid used.

According to the results of chemical, microscopic and X-ray phase analyzes of sediments resulting from the acid decomposition of the proposed types of phosphate raw materials, it was found that the optimal conditions for the process of sulfuric acid decomposition for phosphorites are: the concentration of sulfuric acid in the liquid phase is less than 25 wt. %, sulfuric acid consumption rate 100–105%, temperature 80°C, duration not less than two hours. It has been established that differences in the quantitative composition of individual phosphorus-containing phases, in particular apatite and carbonate fluorapatite, have a significant effect on the character, kinetics and quantitative indicators of the decomposition process. The most acceptable for processing is Moroccan phosphorite grade K-9.

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