I. D. Troshkina
Dmitry Mendeleyev University of Chemical Technology of Russia (MUCTR).
Russian Federation

Dr. Sci. (Tech.), prof. of the Department of technology of rare elements and nanomaterials of Dmitry Mendeleyev University of Chemical Technology of Russia (MUCTR).

(125047, Russia, Moscow, Miusskaya sq., 9). 

O. A. Veselova
Dmitry Mendeleyev University of Chemical Technology of Russia (MUCTR).
Russian Federation

 engineer of the Department of technology of rare elements and nanomaterials of MUCTR. 

Moscow.

F. Ya. Vatsura
Dmitry Mendeleyev University of Chemical Technology of Russia (MUCTR).
Russian Federation

 student of the Department of technology of rare elements and nanomaterials of MUCTR. 

Moscow.

S. V. Zakharyan
NITSIT LLP «Kazgidromed».
Kazakhstan

Cand. Sci. (Tech.), head of the research laboratory NITSIT LLP «Kazgidromed».

(100009, Republic of Kazakhstan, Karaganda, district Kazybek bi, Erubaev str., 51/1). 

A. U. Serikbay
NITSIT LLP «Kazgidromed».
Kazakhstan

 research engineer of the research laboratory NITSIT LLP «Kazgidromed». 

Karaganda.