Technological aspects of a new method of obtaining magnesium phosphate based on the interaction of magnesium chloride from liquid waste from the processing of potassium ores and sodium phosphate have been studied. The influence of precipitation conditions of magnesium phosphate crystal hydrate, washing of the obtained precipitate and its drying on the yield and product quality was studied. Rational technological parameters of realization of the main stages are chosen. The developed technological process, in comparison with the known ones, allows to simplify the technology, reduce the cost of production, balance the composition of liquid waste for further processing into potassium-magnesium fertilizers.

On the 150th anniversary occasion of the Department of Chemical Technology at the Lviv Polytechnic National University founding, the activities of chemical departments and faculties at the time of Polytechnic School in 1877–1918 and the conditions of study of students was covered. Creation and transformation of chemical departments and the role of their leaders was considered. Scientific-pedagogical and public activities of famous scientists and teachers such as August Freund, Yulian Medvedskyi, Bronislaw Pawlewski, Roman Zaloziecki, Stefan Niementowski, Ignacy Moscicki, their contribution to development of Lviv Polytechnic and Galicia was characterized.