The impact of functional groups of the surface of carbon materials on the efficiency of purification of extraction phosphoric acid from fluorine compounds

Smirnov Nikolay Nikolaevich¹, Konoval Anastasiya Vasilevna¹, Smirnova Daria Nikolaevna¹, Kochetkov Sergei Pavlovich²

¹ Federal state budget educational institution of higher education «Ivanovo State University of Chemistry and Technology», Ivanovo, Russia

² Kolomna Institute of Moscow Polytechnic University, Kolomna, Russia

Abstract:

The environmental problems of the production of extraction phosphoric acid and the effect of fluorine on the human body are discussed in the article. The creation of the industry of phosphoric fertilizers on the basis of processing of fluorine-containing phosphate raw materials and fluorine-containing compounds, the development of their application require the study of environmental consequences arising from this, because fluorine is characterized by high mobility in the biological cycle of metabolism. For the purification of phosphoric acid from fluorine was used carbon adsorbents such as active charcoal brand BAU, natural graphite deposits Kyshtymsky, P514 soot, charcoal. Experiments on the purification was carried out on non-evaporated half-hydrated extraction phosphoric acid which was produced by joint stock company «Apatit» in Cherepovets city in Russia. The following analyses were carried out: IR-Fourier spectrometry, research of acid–base properties of carbon materials by potentiometric titration, potentiometric method of fluorine determination in extraction phosphoric acid. It is mentioned that the carbon black P514 is the most efficient adsorbent for purification of extraction phosphoric acid. The total number of functional groups on its surface is 0.62 mmol/g, the degree of purification from fluorine compounds is 94.8%.

Keywords:

Phosphate fertilizers, adsorbents, fluorine, purification, ecology, carbon, extraction phosphoric acid, functional groups of the surface.